From c6c307b3f71ffcc5e575a6b370ea7f6802e499da Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 11:57:44 +0530
Subject: [PATCH 01/17] merge bitcoin#13541: sendrawtransaction maxfeerate

---
 src/rpc/client.cpp                        |  2 +
 src/rpc/rawtransaction.cpp                | 48 +++++++++++++++++------
 test/functional/feature_addressindex.py   | 14 +++----
 test/functional/feature_cltv.py           |  2 +-
 test/functional/feature_dersig.py         |  2 +-
 test/functional/feature_fee_estimation.py |  4 +-
 test/functional/feature_nulldummy.py      | 10 ++---
 test/functional/feature_spentindex.py     |  4 +-
 test/functional/feature_txindex.py        |  2 +-
 test/functional/mempool_accept.py         | 16 ++++----
 test/functional/mempool_resurrect.py      |  4 +-
 test/functional/rpc_rawtransaction.py     | 37 ++++++++++++-----
 test/functional/test_framework/util.py    |  4 +-
 test/functional/wallet_basic.py           |  4 +-
 14 files changed, 98 insertions(+), 55 deletions(-)

diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp
index af5bea8bee..31e704891c 100644
--- a/src/rpc/client.cpp
+++ b/src/rpc/client.cpp
@@ -111,10 +111,12 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "signrawtransactionwithkey", 2, "prevtxs" },
     { "signrawtransactionwithwallet", 1, "prevtxs" },
     { "sendrawtransaction", 1, "allowhighfees" },
+    { "sendrawtransaction", 1, "maxfeerate" },
     { "sendrawtransaction", 2, "instantsend" },
     { "sendrawtransaction", 3, "bypasslimits" },
     { "testmempoolaccept", 0, "rawtxs" },
     { "testmempoolaccept", 1, "allowhighfees" },
+    { "testmempoolaccept", 1, "maxfeerate" },
     { "combinerawtransaction", 0, "txs" },
     { "fundrawtransaction", 1, "options" },
     { "walletcreatefundedpsbt", 0, "inputs" },
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index 55ab4845d5..6184d73aae 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -30,6 +30,7 @@
 #include <script/standard.h>
 #include <txmempool.h>
 #include <uint256.h>
+#include <util/moneystr.h>
 #include <util/validation.h>
 #include <util/strencodings.h>
 #include <validation.h>
@@ -758,7 +759,7 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
                 "\nAlso see createrawtransaction and signrawtransactionwithkey calls.\n",
                 {
                     {"hexstring", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hex string of the raw transaction"},
-                    {"allowhighfees", RPCArg::Type::BOOL, /* default */ "false", "Allow high fees"},
+                    {"maxfeerate", RPCArg::Type::AMOUNT, /* default */ FormatMoney(maxTxFee), "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT + "/kB\n"},
                     {"instantsend", RPCArg::Type::BOOL, RPCArg::Optional::OMITTED, "Deprecated and ignored"},
                     {"bypasslimits", RPCArg::Type::BOOL, /* default_val */ "false", "Bypass transaction policy limits"},
                 },
@@ -777,21 +778,34 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
                 },
             }.ToString());
 
-    RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VBOOL, UniValue::VBOOL});
+    RPCTypeCheck(request.params, {
+        UniValue::VSTR,
+        UniValueType(), // NUM or BOOL, checked later
+        UniValue::VBOOL
+    });
 
     // parse hex string from parameter
     CMutableTransaction mtx;
     if (!DecodeHexTx(mtx, request.params[0].get_str()))
         throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed");
     CTransactionRef tx(MakeTransactionRef(std::move(mtx)));
-    bool allowhighfees = false;
-    if (!request.params[1].isNull()) allowhighfees = request.params[1].get_bool();
+    CAmount max_raw_tx_fee = ::maxTxFee;
+
+    // TODO: temporary migration code for old clients. Remove in v0.20
+    if (request.params[1].isBool()) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Second argument must be numeric (maxfeerate) and no longer supports a boolean. To allow a transaction with high fees, set maxfeerate to 0.");
+    } else if (request.params[1].isNum()) {
+        CFeeRate fr(AmountFromValue(request.params[1]));
+        max_raw_tx_fee = fr.GetFee(GetVirtualTransactionSize(*tx));
+    } else if (!request.params[1].isNull()) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "second argument (maxfeerate) must be numeric");
+    }
+
     bool bypass_limits = false;
     if (!request.params[3].isNull()) bypass_limits = request.params[3].get_bool();
-    const CAmount highfee{allowhighfees ? 0 : ::maxTxFee};
     uint256 txid;
     std::string err_string;
-    const TransactionError err = BroadcastTransaction(tx, txid, err_string, highfee, bypass_limits);
+    const TransactionError err = BroadcastTransaction(tx, txid, err_string, max_raw_tx_fee, bypass_limits);
     if (TransactionError::OK != err) {
         throw JSONRPCTransactionError(err, err_string);
     }
@@ -814,7 +828,7 @@ static UniValue testmempoolaccept(const JSONRPCRequest& request)
                             {"rawtx", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, ""},
                         },
                         },
-                    {"allowhighfees", RPCArg::Type::BOOL, /* default */ "false", "Allow high fees"},
+                    {"maxfeerate", RPCArg::Type::AMOUNT, /* default */ FormatMoney(maxTxFee), "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT + "/kB\n"},
                 },
                 RPCResult{
             "[                   (array) The result of the mempool acceptance test for each raw transaction in the input array.\n"
@@ -839,7 +853,11 @@ static UniValue testmempoolaccept(const JSONRPCRequest& request)
             }.ToString());
     }
 
-    RPCTypeCheck(request.params, {UniValue::VARR, UniValue::VBOOL});
+    RPCTypeCheck(request.params, {
+        UniValue::VARR,
+        UniValueType(), // NUM or BOOL, checked later
+    });
+
     if (request.params[0].get_array().size() != 1) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Array must contain exactly one raw transaction for now");
     }
@@ -852,8 +870,14 @@ static UniValue testmempoolaccept(const JSONRPCRequest& request)
     const uint256& tx_hash = tx->GetHash();
 
     CAmount max_raw_tx_fee = ::maxTxFee;
-    if (!request.params[1].isNull() && request.params[1].get_bool()) {
-        max_raw_tx_fee = 0;
+    // TODO: temporary migration code for old clients. Remove in v0.20
+    if (request.params[1].isBool()) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Second argument must be numeric (maxfeerate) and no longer supports a boolean. To allow a transaction with high fees, set maxfeerate to 0.");
+    } else if (request.params[1].isNum()) {
+        CFeeRate fr(AmountFromValue(request.params[1]));
+        max_raw_tx_fee = fr.GetFee(GetVirtualTransactionSize(*tx));
+    } else if (!request.params[1].isNull()) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "second argument (maxfeerate) must be numeric");
     }
 
     UniValue result(UniValue::VARR);
@@ -1375,10 +1399,10 @@ static const CRPCCommand commands[] =
     { "rawtransactions",    "createrawtransaction",         &createrawtransaction,      {"inputs","outputs","locktime"} },
     { "rawtransactions",    "decoderawtransaction",         &decoderawtransaction,      {"hexstring"} },
     { "rawtransactions",    "decodescript",                 &decodescript,              {"hexstring"} },
-    { "rawtransactions",    "sendrawtransaction",           &sendrawtransaction,        {"hexstring","allowhighfees","instantsend","bypasslimits"} },
+    { "rawtransactions",    "sendrawtransaction",           &sendrawtransaction,        {"hexstring","allowhighfees|maxfeerate","instantsend","bypasslimits"} },
     { "rawtransactions",    "combinerawtransaction",        &combinerawtransaction,     {"txs"} },
     { "rawtransactions",    "signrawtransactionwithkey",    &signrawtransactionwithkey, {"hexstring","privkeys","prevtxs","sighashtype"} },
-    { "rawtransactions",    "testmempoolaccept",            &testmempoolaccept,         {"rawtxs","allowhighfees"} },
+    { "rawtransactions",    "testmempoolaccept",            &testmempoolaccept,         {"rawtxs","allowhighfees|maxfeerate"} },
     { "rawtransactions",    "decodepsbt",                   &decodepsbt,                {"psbt"} },
     { "rawtransactions",    "combinepsbt",                  &combinepsbt,               {"txs"} },
     { "rawtransactions",    "finalizepsbt",                 &finalizepsbt,              {"psbt", "extract"} },
diff --git a/test/functional/feature_addressindex.py b/test/functional/feature_addressindex.py
index 8cc0cb62d6..df2f7bba84 100755
--- a/test/functional/feature_addressindex.py
+++ b/test/functional/feature_addressindex.py
@@ -140,7 +140,7 @@ class AddressIndexTest(BitcoinTestFramework):
         tx.rehash()
 
         signed_tx = self.nodes[0].signrawtransactionwithwallet(tx.serialize().hex())
-        sent_txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], True)
+        sent_txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], 0)
 
         self.nodes[0].generate(1)
         self.sync_all()
@@ -170,7 +170,7 @@ class AddressIndexTest(BitcoinTestFramework):
         tx.vout = [CTxOut(amount, scriptPubKey2)]
         tx.rehash()
         signed_tx = self.nodes[0].signrawtransactionwithwallet(tx.serialize().hex())
-        spending_txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], True)
+        spending_txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], 0)
         self.nodes[0].generate(1)
         self.sync_all()
         balance1 = self.nodes[1].getaddressbalance(address2)
@@ -184,7 +184,7 @@ class AddressIndexTest(BitcoinTestFramework):
         tx.rehash()
 
         signed_tx = self.nodes[0].signrawtransactionwithwallet(tx.serialize().hex())
-        sent_txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], True)
+        sent_txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], 0)
         self.nodes[0].generate(1)
         self.sync_all()
 
@@ -265,7 +265,7 @@ class AddressIndexTest(BitcoinTestFramework):
         tx.vout = [CTxOut(amount, scriptPubKey3)]
         tx.rehash()
         signed_tx = self.nodes[2].signrawtransactionwithwallet(tx.serialize().hex())
-        memtxid1 = self.nodes[2].sendrawtransaction(signed_tx["hex"], True)
+        memtxid1 = self.nodes[2].sendrawtransaction(signed_tx["hex"], 0)
         self.bump_mocktime(2)
 
         tx2 = CTransaction()
@@ -279,7 +279,7 @@ class AddressIndexTest(BitcoinTestFramework):
         ]
         tx2.rehash()
         signed_tx2 = self.nodes[2].signrawtransactionwithwallet(tx2.serialize().hex())
-        memtxid2 = self.nodes[2].sendrawtransaction(signed_tx2["hex"], True)
+        memtxid2 = self.nodes[2].sendrawtransaction(signed_tx2["hex"], 0)
         self.bump_mocktime(2)
 
         mempool = self.nodes[2].getaddressmempool({"addresses": [address3]})
@@ -306,7 +306,7 @@ class AddressIndexTest(BitcoinTestFramework):
         tx.rehash()
         self.nodes[2].importprivkey(privKey3)
         signed_tx3 = self.nodes[2].signrawtransactionwithwallet(tx.serialize().hex())
-        self.nodes[2].sendrawtransaction(signed_tx3["hex"], True)
+        self.nodes[2].sendrawtransaction(signed_tx3["hex"], 0)
         self.bump_mocktime(2)
 
         mempool3 = self.nodes[2].getaddressmempool({"addresses": [address3]})
@@ -338,7 +338,7 @@ class AddressIndexTest(BitcoinTestFramework):
         tx.rehash()
         self.nodes[0].importprivkey(privkey1)
         signed_tx = self.nodes[0].signrawtransactionwithwallet(tx.serialize().hex())
-        self.nodes[0].sendrawtransaction(signed_tx["hex"], True)
+        self.nodes[0].sendrawtransaction(signed_tx["hex"], 0)
 
         self.sync_all()
         mempool_deltas = self.nodes[2].getaddressmempool({"addresses": [address1]})
diff --git a/test/functional/feature_cltv.py b/test/functional/feature_cltv.py
index 2424c0ea00..f4b1034e3e 100755
--- a/test/functional/feature_cltv.py
+++ b/test/functional/feature_cltv.py
@@ -129,7 +129,7 @@ class BIP65Test(BitcoinTestFramework):
 
         # First we show that this tx is valid except for CLTV by getting it
         # rejected from the mempool for exactly that reason.
-        assert_raises_rpc_error(-26, 'non-mandatory-script-verify-flag (Negative locktime) (code 64)', self.nodes[0].sendrawtransaction, spendtx.serialize().hex(), True)
+        assert_raises_rpc_error(-26, 'non-mandatory-script-verify-flag (Negative locktime) (code 64)', self.nodes[0].sendrawtransaction, spendtx.serialize().hex(), 0)
 
         # Now we verify that a block with this transaction is also invalid.
         block.vtx.append(spendtx)
diff --git a/test/functional/feature_dersig.py b/test/functional/feature_dersig.py
index 414f4aeb55..618d05fee8 100755
--- a/test/functional/feature_dersig.py
+++ b/test/functional/feature_dersig.py
@@ -118,7 +118,7 @@ class BIP66Test(BitcoinTestFramework):
 
         # First we show that this tx is valid except for DERSIG by getting it
         # rejected from the mempool for exactly that reason.
-        assert_raises_rpc_error(-26, 'non-mandatory-script-verify-flag (Non-canonical DER signature) (code 64)', self.nodes[0].sendrawtransaction, spendtx.serialize().hex(), True)
+        assert_raises_rpc_error(-26, 'non-mandatory-script-verify-flag (Non-canonical DER signature) (code 64)', self.nodes[0].sendrawtransaction, spendtx.serialize().hex(), 0)
 
         # Now we verify that a block with this transaction is also invalid.
         block.vtx.append(spendtx)
diff --git a/test/functional/feature_fee_estimation.py b/test/functional/feature_fee_estimation.py
index 8b36d3f423..c000df2182 100755
--- a/test/functional/feature_fee_estimation.py
+++ b/test/functional/feature_fee_estimation.py
@@ -63,7 +63,7 @@ def small_txpuzzle_randfee(from_node, conflist, unconflist, amount, min_fee, fee
     # the ScriptSig that will satisfy the ScriptPubKey.
     for inp in tx.vin:
         inp.scriptSig = SCRIPT_SIG[inp.prevout.n]
-    txid = from_node.sendrawtransaction(ToHex(tx), True)
+    txid = from_node.sendrawtransaction(hexstring=ToHex(tx), maxfeerate=0)
     unconflist.append({"txid": txid, "vout": 0, "amount": total_in - amount - fee})
     unconflist.append({"txid": txid, "vout": 1, "amount": amount})
 
@@ -93,7 +93,7 @@ def split_inputs(from_node, txins, txouts, initial_split=False):
     else:
         tx.vin[0].scriptSig = SCRIPT_SIG[prevtxout["vout"]]
         completetx = ToHex(tx)
-    txid = from_node.sendrawtransaction(completetx, True)
+    txid = from_node.sendrawtransaction(hexstring=completetx, maxfeerate=0)
     txouts.append({"txid": txid, "vout": 0, "amount": half_change})
     txouts.append({"txid": txid, "vout": 1, "amount": rem_change})
 
diff --git a/test/functional/feature_nulldummy.py b/test/functional/feature_nulldummy.py
index 77a9862b7a..25c88790c9 100755
--- a/test/functional/feature_nulldummy.py
+++ b/test/functional/feature_nulldummy.py
@@ -60,15 +60,15 @@ class NULLDUMMYTest(BitcoinTestFramework):
 
         self.log.info("Test 1: NULLDUMMY compliant base transactions should be accepted to mempool and mined before activation [430]")
         test1txs = [create_transaction(self.nodes[0], coinbase_txid[0], self.ms_address, 49)]
-        txid1 = self.nodes[0].sendrawtransaction(test1txs[0].serialize().hex(), True)
+        txid1 = self.nodes[0].sendrawtransaction(test1txs[0].serialize().hex(), 0)
         test1txs.append(create_transaction(self.nodes[0], txid1, self.ms_address, 48))
-        txid2 = self.nodes[0].sendrawtransaction(test1txs[1].serialize().hex(), True)
+        txid2 = self.nodes[0].sendrawtransaction(test1txs[1].serialize().hex(), 0)
         self.block_submit(self.nodes[0], test1txs, True)
 
         self.log.info("Test 2: Non-NULLDUMMY base multisig transaction should not be accepted to mempool before activation")
         test2tx = create_transaction(self.nodes[0], txid2, self.ms_address, 47)
         trueDummy(test2tx)
-        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test2tx.serialize().hex(), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test2tx.serialize().hex(), 0)
 
         self.log.info("Test 3: Non-NULLDUMMY base transactions should be accepted in a block before activation [431]")
         self.block_submit(self.nodes[0], [test2tx], True)
@@ -77,12 +77,12 @@ class NULLDUMMYTest(BitcoinTestFramework):
         test4tx = create_transaction(self.nodes[0], test2tx.hash, self.address, 46)
         test6txs=[CTransaction(test4tx)]
         trueDummy(test4tx)
-        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test4tx.serialize().hex(), True)
+        assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test4tx.serialize().hex(), 0)
         self.block_submit(self.nodes[0], [test4tx])
 
         self.log.info("Test 6: NULLDUMMY compliant transactions should be accepted to mempool and in block after activation [432]")
         for i in test6txs:
-            self.nodes[0].sendrawtransaction(i.serialize().hex(), True)
+            self.nodes[0].sendrawtransaction(i.serialize().hex(), 0)
         self.block_submit(self.nodes[0], test6txs, True)
 
 
diff --git a/test/functional/feature_spentindex.py b/test/functional/feature_spentindex.py
index ff06643a73..9fcc853dcf 100755
--- a/test/functional/feature_spentindex.py
+++ b/test/functional/feature_spentindex.py
@@ -76,7 +76,7 @@ class SpentIndexTest(BitcoinTestFramework):
         tx.rehash()
 
         signed_tx = self.nodes[0].signrawtransactionwithwallet(tx.serialize().hex())
-        txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], True)
+        txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], 0)
         self.nodes[0].generate(1)
         self.sync_all()
 
@@ -111,7 +111,7 @@ class SpentIndexTest(BitcoinTestFramework):
         tx2.rehash()
         self.nodes[0].importprivkey(privkey)
         signed_tx2 = self.nodes[0].signrawtransactionwithwallet(tx2.serialize().hex())
-        txid2 = self.nodes[0].sendrawtransaction(signed_tx2["hex"], True)
+        txid2 = self.nodes[0].sendrawtransaction(signed_tx2["hex"], 0)
 
         # Check the mempool index
         self.sync_all()
diff --git a/test/functional/feature_txindex.py b/test/functional/feature_txindex.py
index 474575c008..449cc9f725 100755
--- a/test/functional/feature_txindex.py
+++ b/test/functional/feature_txindex.py
@@ -59,7 +59,7 @@ class TxIndexTest(BitcoinTestFramework):
         tx.rehash()
 
         signed_tx = self.nodes[0].signrawtransactionwithwallet(tx.serialize().hex())
-        txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], True)
+        txid = self.nodes[0].sendrawtransaction(signed_tx["hex"], 0)
         self.nodes[0].generate(1)
         self.sync_all()
 
diff --git a/test/functional/mempool_accept.py b/test/functional/mempool_accept.py
index e31d70b0a7..c7154d101a 100755
--- a/test/functional/mempool_accept.py
+++ b/test/functional/mempool_accept.py
@@ -70,7 +70,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
             inputs=[{'txid': coin['txid'], 'vout': coin['vout']}],
             outputs=[{node.getnewaddress(): 0.3}, {node.getnewaddress(): 49}],
         ))['hex']
-        txid_in_block = node.sendrawtransaction(hexstring=raw_tx_in_block, allowhighfees=True)
+        txid_in_block = node.sendrawtransaction(hexstring=raw_tx_in_block, maxfeerate=0)
         node.generate(1)
         self.mempool_size = 0
         self.check_mempool_result(
@@ -103,9 +103,9 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(), 'allowed': True}],
             rawtxs=[tx.serialize().hex()],
-            allowhighfees=True,
+            maxfeerate=0,
         )
-        node.sendrawtransaction(hexstring=raw_tx_final, allowhighfees=True)
+        node.sendrawtransaction(hexstring=raw_tx_final, maxfeerate=0)
         self.mempool_size += 1
 
         self.log.info('A transaction in the mempool')
@@ -131,7 +131,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
 
         self.log.info('A transaction that conflicts with an unconfirmed tx')
         # Send the transaction that replaces the mempool transaction and opts out of replaceability
-        # node.sendrawtransaction(hexstring=tx.serialize().hex(), allowhighfees=True)
+        # node.sendrawtransaction(hexstring=tx.serialize().hex(), maxfeerate=0)
         # take original raw_tx_0
         tx.deserialize(BytesIO(hex_str_to_bytes(raw_tx_0)))
         tx.vout[0].nValue -= int(4 * fee * COIN)  # Set more fee
@@ -139,7 +139,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(), 'allowed': False, 'reject-reason': '18: txn-mempool-conflict'}],
             rawtxs=[tx.serialize().hex()],
-            allowhighfees=True,
+            maxfeerate=0,
         )
 
         self.log.info('A transaction with missing inputs, that never existed')
@@ -155,7 +155,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         tx.deserialize(BytesIO(hex_str_to_bytes(raw_tx_0)))
         tx.vin[0].prevout.n = 1  # Set vout to 1, to spend the other outpoint (49 coins) of the in-chain-tx we want to double spend
         raw_tx_1 = node.signrawtransactionwithwallet(tx.serialize().hex())['hex']
-        txid_1 = node.sendrawtransaction(hexstring=raw_tx_1, allowhighfees=True)
+        txid_1 = node.sendrawtransaction(hexstring=raw_tx_1, maxfeerate=0)
         # Now spend both to "clearly hide" the outputs, ie. remove the coins from the utxo set by spending them
         raw_tx_spend_both = node.signrawtransactionwithwallet(node.createrawtransaction(
             inputs=[
@@ -164,7 +164,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
             ],
             outputs=[{node.getnewaddress(): 0.1}]
         ))['hex']
-        txid_spend_both = node.sendrawtransaction(hexstring=raw_tx_spend_both, allowhighfees=True)
+        txid_spend_both = node.sendrawtransaction(hexstring=raw_tx_spend_both, maxfeerate=0)
         node.generate(1)
         self.mempool_size = 0
         # Now see if we can add the coins back to the utxo set by sending the exact txs again
@@ -313,7 +313,7 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(), 'allowed': False, 'reject-reason': '64: non-BIP68-final'}],
             rawtxs=[tx.serialize().hex()],
-            allowhighfees=True,
+            maxfeerate=0,
         )
 
 
diff --git a/test/functional/mempool_resurrect.py b/test/functional/mempool_resurrect.py
index 4b116ea3cf..ccf8d2e24e 100755
--- a/test/functional/mempool_resurrect.py
+++ b/test/functional/mempool_resurrect.py
@@ -31,13 +31,13 @@ class MempoolCoinbaseTest(BitcoinTestFramework):
         b = [ self.nodes[0].getblockhash(n) for n in range(1, 4) ]
         coinbase_txids = [ self.nodes[0].getblock(h)['tx'][0] for h in b ]
         spends1_raw = [ create_raw_transaction(self.nodes[0], txid, node0_address, 500) for txid in coinbase_txids ]
-        spends1_id = [ self.nodes[0].sendrawtransaction(tx, False, False, True) for tx in spends1_raw ]
+        spends1_id = [ self.nodes[0].sendrawtransaction(tx, 0, False, True) for tx in spends1_raw ]
 
         blocks = []
         blocks.extend(self.nodes[0].generate(1))
 
         spends2_raw = [ create_raw_transaction(self.nodes[0], txid, node0_address, 499.99) for txid in spends1_id ]
-        spends2_id = [ self.nodes[0].sendrawtransaction(tx, False, False, True) for tx in spends2_raw ]
+        spends2_id = [ self.nodes[0].sendrawtransaction(tx, 0, False, True) for tx in spends2_raw ]
 
         blocks.extend(self.nodes[0].generate(1))
 
diff --git a/test/functional/rpc_rawtransaction.py b/test/functional/rpc_rawtransaction.py
index 306f92a130..86d3e6ad1b 100755
--- a/test/functional/rpc_rawtransaction.py
+++ b/test/functional/rpc_rawtransaction.py
@@ -234,11 +234,7 @@ class RawTransactionsTest(BitcoinTestFramework):
 
         txDetails = self.nodes[0].gettransaction(txId, True)
         rawTx = self.nodes[0].decoderawtransaction(txDetails['hex'])
-        vout = False
-        for outpoint in rawTx['vout']:
-            if outpoint['value'] == Decimal('2.20000000'):
-                vout = outpoint
-                break
+        vout = next(o for o in rawTx['vout'] if o['value'] == Decimal('2.20000000'))
 
         bal = self.nodes[0].getbalance()
         inputs = [{ "txid" : txId, "vout" : vout['n'], "scriptPubKey" : vout['scriptPubKey']['hex']}]
@@ -279,11 +275,7 @@ class RawTransactionsTest(BitcoinTestFramework):
 
         txDetails = self.nodes[0].gettransaction(txId, True)
         rawTx2 = self.nodes[0].decoderawtransaction(txDetails['hex'])
-        vout = False
-        for outpoint in rawTx2['vout']:
-            if outpoint['value'] == Decimal('2.20000000'):
-                vout = outpoint
-                break
+        vout = next(o for o in rawTx2['vout'] if o['value'] == Decimal('2.20000000'))
 
         bal = self.nodes[0].getbalance()
         inputs = [{ "txid" : txId, "vout" : vout['n'], "scriptPubKey" : vout['scriptPubKey']['hex'], "redeemScript" : mSigObjValid['hex']}]
@@ -375,5 +367,30 @@ class RawTransactionsTest(BitcoinTestFramework):
         decrawtx = self.nodes[0].decoderawtransaction(rawtx)
         assert_equal(decrawtx['version'], 0x7fff)
 
+        self.log.info('sendrawtransaction/testmempoolaccept with maxfeerate')
+
+        txId = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), 1.0)
+        rawTx = self.nodes[0].getrawtransaction(txId, True)
+        vout = next(o for o in rawTx['vout'] if o['value'] == Decimal('1.00000000'))
+
+        self.sync_all()
+        inputs = [{ "txid" : txId, "vout" : vout['n'] }]
+        outputs = { self.nodes[0].getnewaddress() : Decimal("0.99999000") } # 1000 sat fee
+        rawTx = self.nodes[2].createrawtransaction(inputs, outputs)
+        rawTxSigned = self.nodes[2].signrawtransactionwithwallet(rawTx)
+        assert_equal(rawTxSigned['complete'], True)
+        # 1000 sat fee, ~200 b transaction, fee rate should land around 5 sat/b = 0.00005000 BTC/kB
+        # Thus, testmempoolaccept should reject
+        testres = self.nodes[2].testmempoolaccept([rawTxSigned['hex']], 0.00001000)[0]
+        assert_equal(testres['allowed'], False)
+        assert_equal(testres['reject-reason'], '256: absurdly-high-fee')
+        # and sendrawtransaction should throw
+        assert_raises_rpc_error(-26, "absurdly-high-fee", self.nodes[2].sendrawtransaction, rawTxSigned['hex'], 0.00001000)
+        # And below calls should both succeed
+        testres = self.nodes[2].testmempoolaccept(rawtxs=[rawTxSigned['hex']], maxfeerate=0.00007000)[0]
+        assert_equal(testres['allowed'], True)
+        self.nodes[2].sendrawtransaction(hexstring=rawTxSigned['hex'], maxfeerate=0.00007000)
+
+
 if __name__ == '__main__':
     RawTransactionsTest().main()
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index d9ad02ab15..9a50144a42 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -568,7 +568,7 @@ def random_transaction(nodes, amount, min_fee, fee_increment, fee_variants):
 
     rawtx = from_node.createrawtransaction(inputs, outputs)
     signresult = from_node.signrawtransactionwithwallet(rawtx)
-    txid = from_node.sendrawtransaction(signresult["hex"], True)
+    txid = from_node.sendrawtransaction(signresult["hex"], 0)
 
     return (txid, signresult["hex"], fee)
 
@@ -642,7 +642,7 @@ def create_lots_of_big_transactions(node, txouts, utxos, num, fee):
             tx.vout.append(txout)
         newtx = tx.serialize().hex()
         signresult = node.signrawtransactionwithwallet(newtx, None, "NONE")
-        txid = node.sendrawtransaction(signresult["hex"], True)
+        txid = node.sendrawtransaction(signresult["hex"], 0)
         txids.append(txid)
     return txids
 
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
index 61e24a474d..6d259cd3d3 100755
--- a/test/functional/wallet_basic.py
+++ b/test/functional/wallet_basic.py
@@ -174,8 +174,8 @@ class WalletTest(BitcoinTestFramework):
             totalfee += fee_per_input
 
         # Have node 1 (miner) send the transactions
-        self.nodes[1].sendrawtransaction(txns_to_send[0]["hex"])
-        self.nodes[1].sendrawtransaction(txns_to_send[1]["hex"])
+        self.nodes[1].sendrawtransaction(txns_to_send[0]["hex"], 0)
+        self.nodes[1].sendrawtransaction(txns_to_send[1]["hex"], 0)
 
         # Have node1 mine a block to confirm transactions:
         self.nodes[1].generate(1)

From 269501259cf3745c7dde25af76bb5c10d5bd2a44 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 02/17] merge bitcoin#14845: Add wallet_balance.py

Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
---
 test/functional/test_runner.py    |   1 +
 test/functional/wallet_balance.py | 133 ++++++++++++++++++++++++++++++
 test/functional/wallet_basic.py   |  13 ---
 3 files changed, 134 insertions(+), 13 deletions(-)
 create mode 100755 test/functional/wallet_balance.py

diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
index 431ab9a039..44739cad0d 100755
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -179,6 +179,7 @@ BASE_SCRIPTS = [
     'wallet_importprunedfunds.py',
     'p2p_leak_tx.py',
     'rpc_signmessage.py',
+    'wallet_balance.py',
     'feature_nulldummy.py',
     'mempool_accept.py',
     'mempool_expiry.py',
diff --git a/test/functional/wallet_balance.py b/test/functional/wallet_balance.py
new file mode 100755
index 0000000000..8ce9c6cb5f
--- /dev/null
+++ b/test/functional/wallet_balance.py
@@ -0,0 +1,133 @@
+#!/usr/bin/env python3
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test the wallet balance RPC methods."""
+from decimal import Decimal
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+)
+
+RANDOM_COINBASE_ADDRESS = 'ycwedq2f3sz2Yf9JqZsBCQPxp18WU3Hp4J'
+
+def create_transactions(node, address, amt, fees):
+    # Create and sign raw transactions from node to address for amt.
+    # Creates a transaction for each fee and returns an array
+    # of the raw transactions.
+    utxos = node.listunspent(0)
+
+    # Create transactions
+    inputs = []
+    ins_total = 0
+    for utxo in utxos:
+        inputs.append({"txid": utxo["txid"], "vout": utxo["vout"]})
+        ins_total += utxo['amount']
+        if ins_total > amt:
+            break
+
+    txs = []
+    for fee in fees:
+        outputs = {address: amt, node.getrawchangeaddress(): ins_total - amt - fee}
+        raw_tx = node.createrawtransaction(inputs, outputs, 0)
+        raw_tx = node.signrawtransactionwithwallet(raw_tx)
+        txs.append(raw_tx)
+
+    return txs
+
+class WalletTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 2
+        self.setup_clean_chain = True
+
+    def skip_test_if_missing_module(self):
+        self.skip_if_no_wallet()
+
+    def run_test(self):
+        # Check that nodes don't own any UTXOs
+        assert_equal(len(self.nodes[0].listunspent()), 0)
+        assert_equal(len(self.nodes[1].listunspent()), 0)
+
+        self.log.info("Mining one block for each node")
+
+        self.nodes[0].generate(1)
+        self.sync_all()
+        self.nodes[1].generate(1)
+        self.nodes[1].generatetoaddress(100, RANDOM_COINBASE_ADDRESS)
+        self.sync_all()
+
+        assert_equal(self.nodes[0].getbalance(), 500)
+        assert_equal(self.nodes[1].getbalance(), 500)
+
+        self.log.info("Test getbalance with different arguments")
+        assert_equal(self.nodes[0].getbalance("*"), 500)
+        assert_equal(self.nodes[0].getbalance("*", 1), 500)
+        assert_equal(self.nodes[0].getbalance("*", 1, True), 500)
+        assert_equal(self.nodes[0].getbalance(minconf=1), 500)
+
+        # Send 490 BTC from 0 to 1 and 960 BTC from 1 to 0.
+        txs = create_transactions(self.nodes[0], self.nodes[1].getnewaddress(), 490 , [Decimal('0.01')])
+        self.nodes[0].sendrawtransaction(txs[0]['hex'])
+        self.nodes[1].sendrawtransaction(txs[0]['hex'])  # sending on both nodes is faster than waiting for propagation
+
+        self.sync_all()
+        txs = create_transactions(self.nodes[1], self.nodes[0].getnewaddress(), 960, [Decimal('0.01'), Decimal('0.02')])
+        self.nodes[1].sendrawtransaction(txs[0]['hex'])
+        self.nodes[0].sendrawtransaction(txs[0]['hex'])  # sending on both nodes is faster than waiting for propagation
+        self.sync_all()
+
+        # First argument of getbalance must be set to "*"
+        assert_raises_rpc_error(-32, "dummy first argument must be excluded or set to \"*\"", self.nodes[1].getbalance, "")
+
+        self.log.info("Test getbalance and getunconfirmedbalance with unconfirmed inputs")
+
+        # getbalance without any arguments includes unconfirmed transactions, but not untrusted transactions
+        assert_equal(self.nodes[0].getbalance(), Decimal('9.99'))  # change from node 0's send
+        assert_equal(self.nodes[1].getbalance(), Decimal('29.99'))  # change from node 1's send
+        # Same with minconf=0
+        assert_equal(self.nodes[0].getbalance(minconf=0), Decimal('9.99'))
+        assert_equal(self.nodes[1].getbalance(minconf=0), Decimal('29.99'))
+        # getbalance with a minconf incorrectly excludes coins that have been spent more recently than the minconf blocks ago
+        # TODO: fix getbalance tracking of coin spentness depth
+        assert_equal(self.nodes[0].getbalance(minconf=1), Decimal('0'))
+        assert_equal(self.nodes[1].getbalance(minconf=1), Decimal('0'))
+        # getunconfirmedbalance
+        assert_equal(self.nodes[0].getunconfirmedbalance(), Decimal('960'))  # output of node 1's spend
+        assert_equal(self.nodes[1].getunconfirmedbalance(), Decimal('0'))  # Doesn't include output of node 0's send since it was spent
+
+        # Node 1 bumps the transaction fee and resends
+        # self.nodes[1].sendrawtransaction(txs[1]['hex']) # disabled, no RBF in Dash
+        self.sync_all()
+
+        self.log.info("Test getbalance and getunconfirmedbalance with conflicted unconfirmed inputs")
+
+        assert_equal(self.nodes[0].getwalletinfo()["unconfirmed_balance"], Decimal('960'))  # output of node 1's send
+        assert_equal(self.nodes[0].getunconfirmedbalance(), Decimal('960'))
+        assert_equal(self.nodes[1].getwalletinfo()["unconfirmed_balance"], Decimal('0'))  # Doesn't include output of node 0's send since it was spent
+        assert_equal(self.nodes[1].getunconfirmedbalance(), Decimal('0'))
+
+        self.nodes[1].generatetoaddress(1, RANDOM_COINBASE_ADDRESS)
+        self.sync_all()
+
+        # balances are correct after the transactions are confirmed
+        assert_equal(self.nodes[0].getbalance(), Decimal('969.99'))  # node 1's send plus change from node 0's send
+        assert_equal(self.nodes[1].getbalance(), Decimal('29.99'))  # change from node 0's send
+
+        # Send total balance away from node 1
+        txs = create_transactions(self.nodes[1], self.nodes[0].getnewaddress(), Decimal('29.98'), [Decimal('0.01')])
+        self.nodes[1].sendrawtransaction(txs[0]['hex'])
+        self.nodes[1].generatetoaddress(2, RANDOM_COINBASE_ADDRESS)
+        self.sync_all()
+
+        # getbalance with a minconf incorrectly excludes coins that have been spent more recently than the minconf blocks ago
+        # TODO: fix getbalance tracking of coin spentness depth
+        # getbalance with minconf=3 should still show the old balance
+        assert_equal(self.nodes[1].getbalance(minconf=3), Decimal('0'))
+
+        # getbalance with minconf=2 will show the new balance.
+        assert_equal(self.nodes[1].getbalance(minconf=2), Decimal('0'))
+
+if __name__ == '__main__':
+    WalletTest().main()
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
index 6d259cd3d3..cd3eb2815a 100755
--- a/test/functional/wallet_basic.py
+++ b/test/functional/wallet_basic.py
@@ -65,15 +65,6 @@ class WalletTest(BitcoinTestFramework):
         assert_equal(self.nodes[1].getbalance(), 500)
         assert_equal(self.nodes[2].getbalance(), 0)
 
-        # Check getbalance with different arguments
-        assert_equal(self.nodes[0].getbalance("*"), 500)
-        assert_equal(self.nodes[0].getbalance("*", 1), 500)
-        assert_equal(self.nodes[0].getbalance("*", 1, True), 500)
-        assert_equal(self.nodes[0].getbalance(minconf=1), 500)
-
-        # first argument of getbalance must be excluded or set to "*"
-        assert_raises_rpc_error(-32, "dummy first argument must be excluded or set to \"*\"", self.nodes[0].getbalance, "")
-
         # Check that only first and second nodes have UTXOs
         utxos = self.nodes[0].listunspent()
         assert_equal(len(utxos), 1)
@@ -240,10 +231,6 @@ class WalletTest(BitcoinTestFramework):
 
         assert txid1 in self.nodes[3].getrawmempool()
 
-        # Exercise balance rpcs
-        assert_equal(self.nodes[0].getwalletinfo()["unconfirmed_balance"], 1)
-        assert_equal(self.nodes[0].getunconfirmedbalance(), 1)
-
         # check if we can list zero value tx as available coins
         # 1. create raw_tx
         # 2. hex-changed one output to 0.0

From 2fecd1495f9fc7e6638ed700a09432619fcae6fc Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 03/17] merge bitcoin#15401: Actually throw help when passed
 invalid number of params

---
 src/rpc/blockchain.cpp               | 10 +++++-----
 src/rpc/net.cpp                      | 16 +++++++--------
 src/rpc/util.cpp                     | 29 +++++++++++++++++++++-------
 src/rpc/util.h                       |  8 ++++++--
 test/functional/rpc_getblockstats.py |  5 +++++
 5 files changed, 46 insertions(+), 22 deletions(-)

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 2dce9e1c96..19619488b7 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -1,5 +1,5 @@
 // Copyright (c) 2010 Satoshi Nakamoto
-// Copyright (c) 2009-2015 The Bitcoin Core developers
+// Copyright (c) 2009-2019 The Bitcoin Core developers
 // Copyright (c) 2014-2021 The Dash Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
@@ -2026,9 +2026,7 @@ static constexpr size_t PER_UTXO_OVERHEAD = sizeof(COutPoint) + sizeof(uint32_t)
 
 static UniValue getblockstats(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 4) {
-        throw std::runtime_error(
-            RPCHelpMan{"getblockstats",
+    const RPCHelpMan help{"getblockstats",
                 "\nCompute per block statistics for a given window. All amounts are in duffs.\n"
                 "It won't work for some heights with pruning.\n"
                 "It won't work without -txindex for utxo_size_inc, *fee or *feerate stats.\n",
@@ -2080,7 +2078,9 @@ static UniValue getblockstats(const JSONRPCRequest& request)
                     HelpExampleCli("getblockstats", "1000 '[\"minfeerate\",\"avgfeerate\"]'")
             + HelpExampleRpc("getblockstats", "1000 '[\"minfeerate\",\"avgfeerate\"]'")
                 },
-            }.ToString());
+    };
+    if (request.fHelp || !help.IsValidNumArgs(request.params.size())) {
+        throw std::runtime_error(help.ToString());
     }
 
     if (g_txindex) {
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index e31be9bb10..6c81036466 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -584,13 +584,7 @@ static UniValue getnetworkinfo(const JSONRPCRequest& request)
 
 static UniValue setban(const JSONRPCRequest& request)
 {
-    std::string strCommand;
-    if (!request.params[1].isNull())
-        strCommand = request.params[1].get_str();
-    if (request.fHelp || request.params.size() < 2 ||
-        (strCommand != "add" && strCommand != "remove"))
-        throw std::runtime_error(
-            RPCHelpMan{"setban",
+    const RPCHelpMan help{"setban",
                 "\nAttempts to add or remove an IP/Subnet from the banned list.\n",
                 {
                     {"subnet", RPCArg::Type::STR, RPCArg::Optional::NO, "The IP/Subnet (see getpeerinfo for nodes IP) with an optional netmask (default is /32 = single IP)"},
@@ -604,7 +598,13 @@ static UniValue setban(const JSONRPCRequest& request)
                             + HelpExampleCli("setban", "\"192.168.0.0/24\" \"add\"")
                             + HelpExampleRpc("setban", "\"192.168.0.6\", \"add\", 86400")
                 },
-            }.ToString());
+    };
+    std::string strCommand;
+    if (!request.params[1].isNull())
+        strCommand = request.params[1].get_str();
+    if (request.fHelp || !help.IsValidNumArgs(request.params.size()) || (strCommand != "add" && strCommand != "remove")) {
+        throw std::runtime_error(help.ToString());
+    }
     if (!g_banman) {
         throw JSONRPCError(RPC_DATABASE_ERROR, "Error: Ban database not loaded");
     }
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index 8dabed3f39..d881119572 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -1,4 +1,4 @@
-// Copyright (c) 2017 The Bitcoin Core developers
+// Copyright (c) 2017-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -407,6 +407,17 @@ std::string RPCExamples::ToDescriptionString() const
     return m_examples.empty() ? m_examples : "\nExamples:\n" + m_examples;
 }
 
+bool RPCHelpMan::IsValidNumArgs(size_t num_args) const
+{
+    size_t num_required_args = 0;
+    for (size_t n = m_args.size(); n > 0; --n) {
+        if (!m_args.at(n - 1).IsOptional()) {
+            num_required_args = n;
+            break;
+        }
+    }
+    return num_required_args <= num_args && num_args <= m_args.size();
+}
 std::string RPCHelpMan::ToString() const
 {
     std::string ret;
@@ -415,12 +426,7 @@ std::string RPCHelpMan::ToString() const
     ret += m_name;
     bool was_optional{false};
     for (const auto& arg : m_args) {
-        bool optional;
-        if (arg.m_fallback.which() == 1) {
-            optional = true;
-        } else {
-            optional = RPCArg::Optional::NO != boost::get<RPCArg::Optional>(arg.m_fallback);
-        }
+        const bool optional = arg.IsOptional();
         ret += " ";
         if (optional) {
             if (!was_optional) ret += "( ";
@@ -462,6 +468,15 @@ std::string RPCHelpMan::ToString() const
     return ret;
 }
 
+bool RPCArg::IsOptional() const
+{
+    if (m_fallback.which() == 1) {
+        return true;
+    } else {
+        return RPCArg::Optional::NO != boost::get<RPCArg::Optional>(m_fallback);
+    }
+}
+
 std::string RPCArg::ToDescriptionString() const
 {
     std::string ret;
diff --git a/src/rpc/util.h b/src/rpc/util.h
index 112b160974..651056345f 100644
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2017 The Bitcoin Core developers
+// Copyright (c) 2017-2019 The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -103,7 +103,7 @@ struct RPCArg {
         /** Required arg */
         NO,
         /**
-         * Optinal arg that is a named argument and has a default value of
+         * Optional arg that is a named argument and has a default value of
          * `null`. When possible, the default value should be specified.
          */
         OMITTED_NAMED_ARG,
@@ -160,6 +160,8 @@ struct RPCArg {
         assert(type == Type::ARR || type == Type::OBJ);
     }
 
+    bool IsOptional() const;
+
     /**
      * Return the type string of the argument.
      * Set oneline to allow it to be overridden by a custom oneline type string (m_oneline_description).
@@ -235,6 +237,8 @@ public:
     RPCHelpMan(std::string name, std::string description, std::vector<RPCArg> args, RPCResults results, RPCExamples examples);
 
     std::string ToString() const;
+    /** If the supplied number of args is neither too small nor too high */
+    bool IsValidNumArgs(size_t num_args) const;
 
 private:
     const std::string m_name;
diff --git a/test/functional/rpc_getblockstats.py b/test/functional/rpc_getblockstats.py
index ff70e21527..635ff29d56 100755
--- a/test/functional/rpc_getblockstats.py
+++ b/test/functional/rpc_getblockstats.py
@@ -177,5 +177,10 @@ class GetblockstatsTest(BitcoinTestFramework):
         assert_raises_rpc_error(-5, 'Block not found', self.nodes[0].getblockstats,
                                 hash_or_height='000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f')
 
+        # Invalid number of args
+        assert_raises_rpc_error(-1, 'getblockstats hash_or_height ( stats )', self.nodes[0].getblockstats, '00', 1, 2)
+        assert_raises_rpc_error(-1, 'getblockstats hash_or_height ( stats )', self.nodes[0].getblockstats)
+
+
 if __name__ == '__main__':
     GetblockstatsTest().main()

From e1a40e554c87e2fee624745bd541a8d97052fffa Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 04/17] merge bitcoin#15588: Log the actual wallet file version
 and no longer publicly expose the "version" record

---
 src/wallet/db.cpp       |  2 +-
 src/wallet/db.h         | 11 -----------
 src/wallet/walletdb.cpp | 35 +++++++++++------------------------
 src/wallet/walletdb.h   |  4 ----
 4 files changed, 12 insertions(+), 40 deletions(-)

diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index 4807b78bcd..98c4f04e8f 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -584,7 +584,7 @@ BerkeleyBatch::BerkeleyBatch(BerkeleyDatabase& database, const char* pszMode, bo
             if (fCreate && !Exists(std::string("version"))) {
                 bool fTmp = fReadOnly;
                 fReadOnly = false;
-                WriteVersion(CLIENT_VERSION);
+                Write(std::string("version"), CLIENT_VERSION);
                 fReadOnly = fTmp;
             }
         }
diff --git a/src/wallet/db.h b/src/wallet/db.h
index 8a8b8d4867..9035424b38 100644
--- a/src/wallet/db.h
+++ b/src/wallet/db.h
@@ -406,17 +406,6 @@ public:
         return (ret == 0);
     }
 
-    bool ReadVersion(int& nVersion)
-    {
-        nVersion = 0;
-        return Read(std::string("version"), nVersion);
-    }
-
-    bool WriteVersion(int nVersion)
-    {
-        return Write(std::string("version"), nVersion);
-    }
-
     bool static Rewrite(BerkeleyDatabase& database, const char* pszSkip = nullptr);
 };
 
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index b50f5cacea..913ff883d0 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -184,7 +184,6 @@ public:
     unsigned int m_unknown_records{0};
     bool fIsEncrypted{false};
     bool fAnyUnordered{false};
-    int nFileVersion{0};
     std::vector<uint256> vWalletUpgrade;
 
     CWalletScanState() {
@@ -394,12 +393,6 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             ssValue >> keypool;
             pwallet->LoadKeyPool(nIndex, keypool);
         }
-        else if (strType == "version")
-        {
-            ssValue >> wss.nFileVersion;
-            if (wss.nFileVersion == 10300)
-                wss.nFileVersion = 300;
-        }
         else if (strType == "cscript")
         {
             uint160 hash;
@@ -485,9 +478,8 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: Unknown non-tolerable wallet flags found";
                 return false;
             }
-        }
-        else if (strType != "bestblock" && strType != "bestblock_nomerkle" &&
-                strType != "minversion" && strType != "acentry"){
+        } else if (strType != "bestblock" && strType != "bestblock_nomerkle" &&
+                strType != "minversion" && strType != "acentry" && strType != "version") {
             wss.m_unknown_records++;
         }
     } catch (const std::exception& e) {
@@ -590,7 +582,12 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
     if (result != DBErrors::LOAD_OK)
         return result;
 
-    pwallet->WalletLogPrintf("nFileVersion = %d\n", wss.nFileVersion);
+    // Last client version to open this wallet, was previously the file version number
+    int last_client = CLIENT_VERSION;
+    m_batch.Read(std::string("version"), last_client);
+
+    int wallet_version = pwallet->GetVersion();
+    pwallet->WalletLogPrintf("Wallet File Version = %d\n", wallet_version > 0 ? wallet_version : last_client);
 
     pwallet->WalletLogPrintf("Keys: %u plaintext, %u encrypted, %u total; Watch scripts: %u; HD PubKeys: %u; Metadata: %u; Unknown wallet records: %u\n",
            wss.nKeys, wss.nCKeys, wss.nKeys + wss.nCKeys,
@@ -604,11 +601,11 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
         WriteTx(pwallet->mapWallet.at(hash));
 
     // Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
-    if (wss.fIsEncrypted && (wss.nFileVersion == 40000 || wss.nFileVersion == 50000))
+    if (wss.fIsEncrypted && (last_client == 40000 || last_client == 50000))
         return DBErrors::NEED_REWRITE;
 
-    if (wss.nFileVersion < CLIENT_VERSION) // Update
-        WriteVersion(CLIENT_VERSION);
+    if (last_client < CLIENT_VERSION) // Update
+        m_batch.Write(std::string("version"), CLIENT_VERSION);
 
     if (wss.fAnyUnordered)
         result = pwallet->ReorderTransactions();
@@ -856,13 +853,3 @@ bool WalletBatch::TxnAbort()
 {
     return m_batch.TxnAbort();
 }
-
-bool WalletBatch::ReadVersion(int& nVersion)
-{
-    return m_batch.ReadVersion(nVersion);
-}
-
-bool WalletBatch::WriteVersion(int nVersion)
-{
-    return m_batch.WriteVersion(nVersion);
-}
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index ee9d1b4786..2fd35afee8 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -192,10 +192,6 @@ public:
     bool TxnCommit();
     //! Abort current transaction
     bool TxnAbort();
-    //! Read wallet version
-    bool ReadVersion(int& nVersion);
-    //! Write wallet version
-    bool WriteVersion(int nVersion);
 private:
     BerkeleyBatch m_batch;
     WalletDatabase& m_database;

From 11fc0f566750a63b0a707b4738526c7ebd212cad Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 05/17] merge bitcoin#15646: Add test for wallet rebroadcasts

Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
---
 .../wallet_resendwallettransactions.py        | 71 +++++++++++++++----
 1 file changed, 59 insertions(+), 12 deletions(-)

diff --git a/test/functional/wallet_resendwallettransactions.py b/test/functional/wallet_resendwallettransactions.py
index 016883bb4e..d8f16eaba2 100755
--- a/test/functional/wallet_resendwallettransactions.py
+++ b/test/functional/wallet_resendwallettransactions.py
@@ -2,31 +2,78 @@
 # Copyright (c) 2017 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
-"""Test resendwallettransactions RPC."""
+"""Test that the wallet resends transactions periodically."""
+from collections import defaultdict
+import time
 
+from test_framework.blocktools import create_block, create_coinbase
+from test_framework.messages import ToHex
+from test_framework.mininode import P2PInterface, mininode_lock
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, assert_raises_rpc_error
+from test_framework.util import assert_equal, wait_until
+
+class P2PStoreTxInvs(P2PInterface):
+    def __init__(self):
+        super().__init__()
+        self.tx_invs_received = defaultdict(int)
+
+    def on_inv(self, message):
+        # Store how many times invs have been received for each tx.
+        for i in message.inv:
+            if i.type == 1:
+                # save txid
+                self.tx_invs_received[i.hash] += 1
 
 class ResendWalletTransactionsTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
-        self.extra_args = [['--walletbroadcast=false']]
 
     def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
 
     def run_test(self):
-        # Should raise RPC_WALLET_ERROR (-4) if walletbroadcast is disabled.
-        assert_raises_rpc_error(-4, "Error: Wallet transaction broadcasting is disabled with -walletbroadcast", self.nodes[0].resendwallettransactions)
+        node = self.nodes[0]  # alias
 
-        # Should return an empty array if there aren't unconfirmed wallet transactions.
-        self.stop_node(0)
-        self.start_node(0, extra_args=[])
-        assert_equal(self.nodes[0].resendwallettransactions(), [])
+        node.add_p2p_connection(P2PStoreTxInvs())
 
-        # Should return an array with the unconfirmed wallet transaction.
-        txid = self.nodes[0].sendtoaddress(self.nodes[0].getnewaddress(), 1)
-        assert_equal(self.nodes[0].resendwallettransactions(), [txid])
+        self.log.info("Create a new transaction and wait until it's broadcast")
+        txid = int(node.sendtoaddress(node.getnewaddress(), 1), 16)
+
+        # Can take a few seconds due to transaction trickling
+        def wait_p2p():
+            self.bump_mocktime(1)
+            return node.p2p.tx_invs_received[txid] >= 1
+        wait_until(wait_p2p, lock=mininode_lock)
+
+        # Add a second peer since txs aren't rebroadcast to the same peer (see filterInventoryKnown)
+        node.add_p2p_connection(P2PStoreTxInvs())
+
+        self.log.info("Create a block")
+        # Create and submit a block without the transaction.
+        # Transactions are only rebroadcast if there has been a block at least five minutes
+        # after the last time we tried to broadcast. Use mocktime and give an extra minute to be sure.
+        block_time = self.mocktime + 6 * 60
+        node.setmocktime(block_time)
+        block = create_block(int(node.getbestblockhash(), 16), create_coinbase(node.getblockchaininfo()['blocks']), block_time)
+        block.nVersion = 3
+        block.rehash()
+        block.solve()
+        node.submitblock(ToHex(block))
+
+        # Transaction should not be rebroadcast
+        node.p2ps[1].sync_with_ping()
+        assert_equal(node.p2ps[1].tx_invs_received[txid], 0)
+
+        self.log.info("Transaction should be rebroadcast after 30 minutes")
+        # Use mocktime and give an extra 5 minutes to be sure.
+        rebroadcast_time = self.mocktime + 41 * 60
+        node.setmocktime(rebroadcast_time)
+        self.mocktime = rebroadcast_time
+
+        def wait_p2p_1():
+            self.bump_mocktime(1)
+            return node.p2ps[1].tx_invs_received[txid] >= 1
+        wait_until(wait_p2p_1, lock=mininode_lock)
 
 if __name__ == '__main__':
     ResendWalletTransactionsTest().main()

From ee4f2fc8b45d658773b724f7302c3e446785c300 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 06/17] merge bitcoin#15728: Refactor relay transactions

---
 src/wallet/wallet.cpp | 33 +++++++++++++++++++--------------
 src/wallet/wallet.h   |  2 +-
 2 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 30f1f38031..f2276636d9 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2284,20 +2284,25 @@ void CWallet::ReacceptWalletTransactions()
 
 bool CWalletTx::RelayWalletTransaction(interfaces::Chain::Lock& locked_chain)
 {
-    assert(pwallet->GetBroadcastTransactions());
-    if (!IsCoinBase() && !isAbandoned() && GetDepthInMainChain(locked_chain) == 0)
-    {
-        CValidationState state;
-        /* GetDepthInMainChain already catches known conflicts. */
-        if (InMempool() || AcceptToMemoryPool(locked_chain, state)) {
-            pwallet->WalletLogPrintf("Relaying wtx %s\n", GetHash().ToString());
-            if (pwallet->chain().p2pEnabled()) {
-                pwallet->chain().relayTransaction(GetHash());
-                return true;
-            }
-        }
-    }
-    return false;
+    // Can't relay if wallet is not broadcasting
+    if (!pwallet->GetBroadcastTransactions()) return false;
+    // Don't relay coinbase transactions outside blocks
+    if (IsCoinBase()) return false;
+    // Don't relay abandoned transactions
+    if (isAbandoned()) return false;
+    // Don't relay conflicted or already confirmed transactions
+    if (GetDepthInMainChain(locked_chain) != 0) return false;
+    // Don't relay transactions that aren't accepted to the mempool
+    CValidationState unused_state;
+    if (!InMempool() && !AcceptToMemoryPool(locked_chain, unused_state)) return false;
+    // Don't try to relay if the node is not connected to the p2p network
+    if (!pwallet->chain().p2pEnabled()) return false;
+
+    // Try to relay the transaction
+    pwallet->WalletLogPrintf("Relaying wtx %s\n", GetHash().ToString());
+    pwallet->chain().relayTransaction(GetHash());
+
+    return true;
 }
 
 std::set<uint256> CWalletTx::GetConflicts() const
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index e68d4d4dff..ad5d88a82e 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -520,7 +520,7 @@ public:
 
     int64_t GetTxTime() const;
 
-    // RelayWalletTransaction may only be called if fBroadcastTransactions!
+    // Pass this transaction to the node to relay to its peers
     bool RelayWalletTransaction(interfaces::Chain::Lock& locked_chain);
 
     /** Pass this transaction to the mempool. Fails if absolute fee exceeds absurd fee. */

From c04f74b1d4d69773a6833973d956205630a65a0d Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 07/17] merge bitcoin#15680: Remove resendwallettransactions
 RPC method

---
 src/wallet/rpcwallet.cpp        | 44 -------------------------
 src/wallet/wallet.cpp           | 57 ++++++++++++---------------------
 src/wallet/wallet.h             |  2 --
 test/functional/wallet_basic.py | 16 +--------
 4 files changed, 22 insertions(+), 97 deletions(-)

diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 41fddaa13f..155f6a3842 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -3013,49 +3013,6 @@ static UniValue unloadwallet(const JSONRPCRequest& request)
     return NullUniValue;
 }
 
-static UniValue resendwallettransactions(const JSONRPCRequest& request)
-{
-    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
-    CWallet* const pwallet = wallet.get();
-
-    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
-        return NullUniValue;
-    }
-
-    if (request.fHelp || request.params.size() != 0)
-        throw std::runtime_error(
-            RPCHelpMan{"resendwallettransactions",
-                "Immediately re-broadcast unconfirmed wallet transactions to all peers.\n"
-                "Intended only for testing; the wallet code periodically re-broadcasts\n"
-                "automatically.\n",
-                {},
-                RPCResult{
-            "Returns an RPC error if -walletbroadcast is set to false.\n"
-            "Returns array of transaction ids that were re-broadcast.\n"
-                },
-                 RPCExamples{""},
-             }.ToString()
-            );
-
-    if (!pwallet->chain().p2pEnabled())
-        throw JSONRPCError(RPC_CLIENT_P2P_DISABLED, "Error: Peer-to-peer functionality missing or disabled");
-
-    auto locked_chain = pwallet->chain().lock();
-    LOCK2(mempool.cs, pwallet->cs_wallet);
-
-    if (!pwallet->GetBroadcastTransactions()) {
-        throw JSONRPCError(RPC_WALLET_ERROR, "Error: Wallet transaction broadcasting is disabled with -walletbroadcast");
-    }
-
-    std::vector<uint256> txids = pwallet->ResendWalletTransactionsBefore(*locked_chain, GetTime());
-    UniValue result(UniValue::VARR);
-    for (const uint256& txid : txids)
-    {
-        result.push_back(txid.ToString());
-    }
-    return result;
-}
-
 static UniValue listunspent(const JSONRPCRequest& request)
 {
     std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
@@ -4205,7 +4162,6 @@ static const CRPCCommand commands[] =
     { "hidden",             "generate",                         &generate,                      {"nblocks","maxtries"} }, // Hidden as it isn't functional, just an error to let people know if miner isn't compiled
 #endif //ENABLE_MINER
     { "hidden",             "instantsendtoaddress",             &instantsendtoaddress,          {} },
-    { "hidden",             "resendwallettransactions",         &resendwallettransactions,      {} },
     { "rawtransactions",    "fundrawtransaction",               &fundrawtransaction,            {"hexstring","options"} },
     { "wallet",             "abandontransaction",               &abandontransaction,            {"txid"} },
     { "wallet",             "abortrescan",                      &abortrescan,                   {} },
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index f2276636d9..c024c04614 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2598,52 +2598,37 @@ bool CWalletTx::IsEquivalentTo(const CWalletTx& _tx) const
         return CTransaction(tx1) == CTransaction(tx2);
 }
 
-std::vector<uint256> CWallet::ResendWalletTransactionsBefore(interfaces::Chain::Lock& locked_chain, int64_t nTime)
-{
-    std::vector<uint256> result;
-
-    LOCK2(mempool.cs, cs_wallet);
-
-    // Sort them in chronological order
-    std::multimap<unsigned int, CWalletTx*> mapSorted;
-    for (std::pair<const uint256, CWalletTx>& item : mapWallet)
-    {
-        CWalletTx& wtx = item.second;
-        // Don't rebroadcast if newer than nTime:
-        if (wtx.nTimeReceived > nTime)
-            continue;
-        mapSorted.insert(std::make_pair(wtx.nTimeReceived, &wtx));
-    }
-    for (const std::pair<const unsigned int, CWalletTx*>& item : mapSorted)
-    {
-        CWalletTx& wtx = *item.second;
-        if (wtx.RelayWalletTransaction(locked_chain))
-            result.push_back(wtx.GetHash());
-    }
-    return result;
-}
-
 void CWallet::ResendWalletTransactions(interfaces::Chain::Lock& locked_chain, int64_t nBestBlockTime)
 {
     // Do this infrequently and randomly to avoid giving away
     // that these are our transactions.
-    if (GetTime() < nNextResend || !fBroadcastTransactions)
-        return;
+    if (GetTime() < nNextResend || !fBroadcastTransactions) return;
     bool fFirst = (nNextResend == 0);
     nNextResend = GetTime() + GetRand(30 * 60);
-    if (fFirst)
-        return;
+    if (fFirst) return;
 
     // Only do it if there's been a new block since last time
-    if (nBestBlockTime < nLastResend)
-        return;
+    if (nBestBlockTime < nLastResend) return;
     nLastResend = GetTime();
 
-    // Rebroadcast unconfirmed txes older than 5 minutes before the last
-    // block was found:
-    std::vector<uint256> relayed = ResendWalletTransactionsBefore(locked_chain, nBestBlockTime-5*60);
-    if (!relayed.empty())
-        WalletLogPrintf("%s: rebroadcast %u unconfirmed transactions\n", __func__, relayed.size());
+    int relayed_tx_count = 0;
+
+    { // mempool.cs and cs_wallet scope
+        LOCK2(mempool.cs, cs_wallet);
+
+        // Relay transactions
+        for (std::pair<const uint256, CWalletTx>& item : mapWallet) {
+            CWalletTx& wtx = item.second;
+            // only rebroadcast unconfirmed txes older than 5 minutes before the
+            // last block was found
+            if (wtx.nTimeReceived > nBestBlockTime - 5 * 60) continue;
+            relayed_tx_count += wtx.RelayWalletTransaction(*locked_chain) ? 1 : 0;
+        }
+    } // mempool.cs and cs_wallet
+
+    if (relayed_tx_count > 0) {
+        WalletLogPrintf("%s: rebroadcast %u unconfirmed transactions\n", __func__, relayed_tx_count);
+    }
 }
 
 /** @} */ // end of mapWallet
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index ad5d88a82e..5011195914 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -1004,8 +1004,6 @@ public:
     void TransactionRemovedFromMempool(const CTransactionRef &ptx, MemPoolRemovalReason reason) override;
     void ReacceptWalletTransactions();
     void ResendWalletTransactions(interfaces::Chain::Lock& locked_chain, int64_t nBestBlockTime) override;
-    // ResendWalletTransactionsBefore may only be called if fBroadcastTransactions!
-    std::vector<uint256> ResendWalletTransactionsBefore(interfaces::Chain::Lock& locked_chain, int64_t nTime);
     struct Balance {
         CAmount m_mine_trusted{0};           //!< Trusted, at depth=GetBalance.min_depth or more
         CAmount m_mine_untrusted_pending{0}; //!< Untrusted, but in mempool (pending)
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
index cd3eb2815a..7faeba932d 100755
--- a/test/functional/wallet_basic.py
+++ b/test/functional/wallet_basic.py
@@ -213,23 +213,9 @@ class WalletTest(BitcoinTestFramework):
         assert_equal(self.nodes[2].getbalance(), node_2_bal)
         node_0_bal = self.check_fee_amount(self.nodes[0].getbalance(), node_0_bal + Decimal('100'), fee_per_byte, count_bytes(self.nodes[2].gettransaction(txid)['hex']))
 
-        # Test ResendWalletTransactions:
-        # Create a couple of transactions, then start up a fourth
-        # node (nodes[3]) and ask nodes[0] to rebroadcast.
-        # EXPECT: nodes[3] should have those transactions in its mempool.
-        txid1 = self.nodes[0].sendtoaddress(self.nodes[1].getnewaddress(), 1)
-        txid2 = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1)
-        self.sync_mempools(self.nodes[0:2])
-
         self.start_node(3)
         connect_nodes_bi(self.nodes, 0, 3)
-        self.sync_blocks()
-
-        relayed = self.nodes[0].resendwallettransactions()
-        assert_equal(set(relayed), {txid1, txid2})
-        self.sync_mempools()
-
-        assert txid1 in self.nodes[3].getrawmempool()
+        self.sync_all()
 
         # check if we can list zero value tx as available coins
         # 1. create raw_tx

From 3284d82296f5fcacb57f7b3b7aaf5772762071de Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 08/17] merge bitcoin#15620: Uncouple non-wallet rpcs from
 maxTxFee global

---
 src/init.cpp               |  4 ++--
 src/rpc/rawtransaction.cpp | 33 ++++++++++++++++++++-------------
 2 files changed, 22 insertions(+), 15 deletions(-)

diff --git a/src/init.cpp b/src/init.cpp
index 06a1459e46..951bf81c36 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -685,8 +685,8 @@ void SetupServerArgs()
     gArgs.AddArg("-maxsigcachesize=<n>", strprintf("Limit sum of signature cache and script execution cache sizes to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-mocktime=<n>", "Replace actual time with <n> seconds since epoch (default: 0)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
-    gArgs.AddArg("-maxtxfee=<amt>", strprintf("Maximum total fees (in %s) to use in a single wallet transaction or raw transaction; setting this too low may abort large transactions (default: %s)",
-        CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
+    gArgs.AddArg("-maxtxfee=<amt>", strprintf("Maximum total fees (in %s) to use in a single wallet transaction; setting this too low may abort large transactions (default: %s)",
+        CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST); // TODO move setting to wallet
     gArgs.AddArg("-minsporkkeys=<n>", "Overrides minimum spork signers to change spork value. Only useful for regtest and devnet. Using this on mainnet or testnet will ban you.", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-printpriority", strprintf("Log transaction fee per kB when mining blocks (default: %u)", DEFAULT_PRINTPRIORITY), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-printtoconsole", "Send trace/debug info to console (default: 1 when no -daemon. To disable logging to file, set -nodebuglogfile)", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index 6184d73aae..82ce458af7 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -48,6 +48,11 @@
 
 #include <univalue.h>
 
+/** High fee for sendrawtransaction and testmempoolaccept.
+ * By default, transaction with a fee higher than this will be rejected by the
+ * RPCs. This can be overriden with the maxfeerate argument.
+ */
+constexpr static CAmount DEFAULT_MAX_RAW_TX_FEE{COIN / 10};
 
 void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry)
 {
@@ -752,14 +757,11 @@ static UniValue signrawtransactionwithkey(const JSONRPCRequest& request)
 
 UniValue sendrawtransaction(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 4)
-        throw std::runtime_error(
-            RPCHelpMan{"sendrawtransaction",
-                "\nSubmits raw transaction (serialized, hex-encoded) to local node and network.\n"
+    const RPCHelpMan help{"sendrawtransaction",                "\nSubmits raw transaction (serialized, hex-encoded) to local node and network.\n"
                 "\nAlso see createrawtransaction and signrawtransactionwithkey calls.\n",
                 {
                     {"hexstring", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hex string of the raw transaction"},
-                    {"maxfeerate", RPCArg::Type::AMOUNT, /* default */ FormatMoney(maxTxFee), "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT + "/kB\n"},
+                    {"maxfeerate", RPCArg::Type::AMOUNT, /* default */ FormatMoney(DEFAULT_MAX_RAW_TX_FEE), "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT + "/kB\n"},
                     {"instantsend", RPCArg::Type::BOOL, RPCArg::Optional::OMITTED, "Deprecated and ignored"},
                     {"bypasslimits", RPCArg::Type::BOOL, /* default_val */ "false", "Bypass transaction policy limits"},
                 },
@@ -776,7 +778,11 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
             "\nAs a JSON-RPC call\n"
             + HelpExampleRpc("sendrawtransaction", "\"signedhex\"")
                 },
-            }.ToString());
+    };
+
+    if (request.fHelp || !help.IsValidNumArgs(request.params.size())) {
+        throw std::runtime_error(help.ToString());
+    }
 
     RPCTypeCheck(request.params, {
         UniValue::VSTR,
@@ -789,7 +795,7 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
     if (!DecodeHexTx(mtx, request.params[0].get_str()))
         throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed");
     CTransactionRef tx(MakeTransactionRef(std::move(mtx)));
-    CAmount max_raw_tx_fee = ::maxTxFee;
+    CAmount max_raw_tx_fee = DEFAULT_MAX_RAW_TX_FEE;
 
     // TODO: temporary migration code for old clients. Remove in v0.20
     if (request.params[1].isBool()) {
@@ -815,9 +821,7 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
 
 static UniValue testmempoolaccept(const JSONRPCRequest& request)
 {
-    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2) {
-        throw std::runtime_error(
-            RPCHelpMan{"testmempoolaccept",
+    const RPCHelpMan help{"testmempoolaccept",
                 "\nReturns result of mempool acceptance tests indicating if raw transaction (serialized, hex-encoded) would be accepted by mempool.\n"
                 "\nThis checks if the transaction violates the consensus or policy rules.\n"
                 "\nSee sendrawtransaction call.\n",
@@ -828,7 +832,7 @@ static UniValue testmempoolaccept(const JSONRPCRequest& request)
                             {"rawtx", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, ""},
                         },
                         },
-                    {"maxfeerate", RPCArg::Type::AMOUNT, /* default */ FormatMoney(maxTxFee), "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT + "/kB\n"},
+                    {"maxfeerate", RPCArg::Type::AMOUNT, /* default */ FormatMoney(DEFAULT_MAX_RAW_TX_FEE), "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT + "/kB\n"},
                 },
                 RPCResult{
             "[                   (array) The result of the mempool acceptance test for each raw transaction in the input array.\n"
@@ -850,7 +854,10 @@ static UniValue testmempoolaccept(const JSONRPCRequest& request)
             "\nAs a JSON-RPC call\n"
             + HelpExampleRpc("testmempoolaccept", "[\"signedhex\"]")
                 },
-            }.ToString());
+    };
+
+    if (request.fHelp || !help.IsValidNumArgs(request.params.size())) {
+        throw std::runtime_error(help.ToString());
     }
 
     RPCTypeCheck(request.params, {
@@ -869,7 +876,7 @@ static UniValue testmempoolaccept(const JSONRPCRequest& request)
     CTransactionRef tx(MakeTransactionRef(std::move(mtx)));
     const uint256& tx_hash = tx->GetHash();
 
-    CAmount max_raw_tx_fee = ::maxTxFee;
+    CAmount max_raw_tx_fee = DEFAULT_MAX_RAW_TX_FEE;
     // TODO: temporary migration code for old clients. Remove in v0.20
     if (request.params[1].isBool()) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, "Second argument must be numeric (maxfeerate) and no longer supports a boolean. To allow a transaction with high fees, set maxfeerate to 0.");

From ed48a889bf380e97ff8d18788941e0bd749ef341 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 21:27:51 +0530
Subject: [PATCH 09/17] merge bitcoin#15632: Remove ResendWalletTransactions
 from the Validation Interface

---
 src/interfaces/chain.cpp                      | 13 ++-----
 src/interfaces/chain.h                        |  5 ++-
 src/net_processing.cpp                        | 19 ----------
 src/validationinterface.cpp                   |  7 ----
 src/validationinterface.h                     |  3 --
 src/wallet/load.cpp                           |  3 +-
 src/wallet/wallet.cpp                         | 37 +++++++++++++++----
 src/wallet/wallet.h                           | 11 +++++-
 .../wallet_resendwallettransactions.py        |  6 +++
 9 files changed, 56 insertions(+), 48 deletions(-)

diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 056ee0d3ba..53e7346cb0 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -217,17 +217,11 @@ public:
     {
         m_notifications->BlockDisconnected(*block);
     }
-    void ChainStateFlushed(const CBlockLocator& locator) override { m_notifications->ChainStateFlushed(locator); }
-    void ResendWalletTransactions(int64_t best_block_time, CConnman*) override
+    void UpdatedBlockTip(const CBlockIndex* index, const CBlockIndex* fork_index, bool is_ibd) override
     {
-        // `cs_main` is always held when this method is called, so it is safe to
-        // call `assumeLocked`. This is awkward, and the `assumeLocked` method
-        // should be able to be removed entirely if `ResendWalletTransactions`
-        // is replaced by a wallet timer as suggested in
-        // https://github.com/bitcoin/bitcoin/issues/15619
-        auto locked_chain = m_chain.assumeLocked();
-        m_notifications->ResendWalletTransactions(*locked_chain, best_block_time);
+        m_notifications->UpdatedBlockTip();
     }
+    void ChainStateFlushed(const CBlockLocator& locator) override { m_notifications->ChainStateFlushed(locator); }
     void NotifyChainLock(const CBlockIndex* pindexChainLock, const std::shared_ptr<const llmq::CChainLockSig>& clsig) override
     {
         m_notifications->NotifyChainLock(pindexChainLock, clsig);
@@ -365,6 +359,7 @@ public:
     CAmount maxTxFee() override { return ::maxTxFee; }
     bool getPruneMode() override { return ::fPruneMode; }
     bool p2pEnabled() override { return g_connman != nullptr; }
+    bool isReadyToBroadcast() override { return !::fImporting && !::fReindex && !::ChainstateActive().IsInitialBlockDownload(); }
     bool isInitialBlockDownload() override { return ::ChainstateActive().IsInitialBlockDownload(); }
     bool shutdownRequested() override { return ShutdownRequested(); }
     int64_t getAdjustedTime() override { return GetAdjustedTime(); }
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index aa4fe8afd9..72b431be68 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -223,6 +223,9 @@ public:
     //! Check if p2p enabled.
     virtual bool p2pEnabled() = 0;
 
+    //! Check if the node is ready to broadcast transactions.
+    virtual bool isReadyToBroadcast() = 0;
+
     //! Check if in IBD.
     virtual bool isInitialBlockDownload() = 0;
 
@@ -256,8 +259,8 @@ public:
         virtual void TransactionRemovedFromMempool(const CTransactionRef& ptx, MemPoolRemovalReason reason) {}
         virtual void BlockConnected(const CBlock& block, const std::vector<CTransactionRef>& tx_conflicted) {}
         virtual void BlockDisconnected(const CBlock& block) {}
+        virtual void UpdatedBlockTip() {}
         virtual void ChainStateFlushed(const CBlockLocator& locator) {}
-        virtual void ResendWalletTransactions(Lock& locked_chain, int64_t best_block_time) {}
         virtual void NotifyChainLock(const CBlockIndex* pindexChainLock, const std::shared_ptr<const llmq::CChainLockSig>& clsig) {}
         virtual void NotifyTransactionLock(const CTransactionRef &tx, const std::shared_ptr<const llmq::CInstantSendLock>& islock) {}
     };
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index e0d03c21c0..fe89b16c23 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -237,8 +237,6 @@ namespace {
     /** Expiration-time ordered list of (expire time, relay map entry) pairs. */
     std::deque<std::pair<int64_t, MapRelay::iterator>> vRelayExpiration GUARDED_BY(cs_main);
 
-    std::atomic<int64_t> nTimeBestReceived(0); // Used only to inform the wallet of when we last received a block
-
     struct IteratorComparator
     {
         template<typename I>
@@ -1314,8 +1312,6 @@ void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CB
         });
         connman->WakeMessageHandler();
     }
-
-    nTimeBestReceived = GetTime();
 }
 
 /**
@@ -4381,21 +4377,6 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
             }
         }
 
-        // Resend wallet transactions that haven't gotten in a block yet
-        // Except during reindex, importing and IBD, when old wallet
-        // transactions become unconfirmed and spams other nodes.
-        if (!fReindex && !fImporting && !::ChainstateActive().IsInitialBlockDownload())
-        {
-            static int64_t nLastBroadcastTime = 0;
-            // HACK: Call this only once every few seconds. SendMessages is called once per peer, which makes this signal very expensive
-            // The proper solution would be to move this out of here, but this is not worth the effort right now as bitcoin#15632 will later do this.
-            // Luckily, the Broadcast signal is not used for anything else then CWallet::ResendWalletTransactionsBefore.
-            if (nNow - nLastBroadcastTime >= 5000000) {
-                GetMainSignals().Broadcast(nTimeBestReceived, connman);
-                nLastBroadcastTime = nNow;
-            }
-        }
-
         //
         // Try sending block announcements via headers
         //
diff --git a/src/validationinterface.cpp b/src/validationinterface.cpp
index 2340c468b1..9e1584083e 100644
--- a/src/validationinterface.cpp
+++ b/src/validationinterface.cpp
@@ -25,7 +25,6 @@ struct ValidationInterfaceConnections {
     boost::signals2::scoped_connection BlockDisconnected;
     boost::signals2::scoped_connection TransactionRemovedFromMempool;
     boost::signals2::scoped_connection ChainStateFlushed;
-    boost::signals2::scoped_connection Broadcast;
     boost::signals2::scoped_connection BlockChecked;
     boost::signals2::scoped_connection NewPoWValidBlock;
     boost::signals2::scoped_connection AcceptedBlockHeader;
@@ -48,7 +47,6 @@ struct MainSignalsInstance {
     boost::signals2::signal<void (const std::shared_ptr<const CBlock> &, const CBlockIndex* pindexDisconnected)> BlockDisconnected;
     boost::signals2::signal<void (const CTransactionRef &, MemPoolRemovalReason)> TransactionRemovedFromMempool;
     boost::signals2::signal<void (const CBlockLocator &)> ChainStateFlushed;
-    boost::signals2::signal<void (int64_t nBestBlockTime, CConnman* connman)> Broadcast;
     boost::signals2::signal<void (const CBlock&, const CValidationState&)> BlockChecked;
     boost::signals2::signal<void (const CBlockIndex *, const std::shared_ptr<const CBlock>&)> NewPoWValidBlock;
     boost::signals2::signal<void (const CBlockIndex *)>AcceptedBlockHeader;
@@ -122,7 +120,6 @@ void RegisterValidationInterface(CValidationInterface* pwalletIn) {
     conns.NotifyChainLock = g_signals.m_internals->NotifyChainLock.connect(std::bind(&CValidationInterface::NotifyChainLock, pwalletIn, std::placeholders::_1, std::placeholders::_2));
     conns.TransactionRemovedFromMempool = g_signals.m_internals->TransactionRemovedFromMempool.connect(std::bind(&CValidationInterface::TransactionRemovedFromMempool, pwalletIn, std::placeholders::_1, std::placeholders::_2));
     conns.ChainStateFlushed = g_signals.m_internals->ChainStateFlushed.connect(std::bind(&CValidationInterface::ChainStateFlushed, pwalletIn, std::placeholders::_1));
-    conns.Broadcast = g_signals.m_internals->Broadcast.connect(std::bind(&CValidationInterface::ResendWalletTransactions, pwalletIn, std::placeholders::_1, std::placeholders::_2));
     conns.BlockChecked = g_signals.m_internals->BlockChecked.connect(std::bind(&CValidationInterface::BlockChecked, pwalletIn, std::placeholders::_1, std::placeholders::_2));
     conns.NewPoWValidBlock = g_signals.m_internals->NewPoWValidBlock.connect(std::bind(&CValidationInterface::NewPoWValidBlock, pwalletIn, std::placeholders::_1, std::placeholders::_2));
     conns.NotifyGovernanceObject = g_signals.m_internals->NotifyGovernanceObject.connect(std::bind(&CValidationInterface::NotifyGovernanceObject, pwalletIn, std::placeholders::_1));
@@ -205,10 +202,6 @@ void CMainSignals::ChainStateFlushed(const CBlockLocator &locator) {
     });
 }
 
-void CMainSignals::Broadcast(int64_t nBestBlockTime, CConnman* connman) {
-    m_internals->Broadcast(nBestBlockTime, connman);
-}
-
 void CMainSignals::BlockChecked(const CBlock& block, const CValidationState& state) {
     m_internals->BlockChecked(block, state);
 }
diff --git a/src/validationinterface.h b/src/validationinterface.h
index 451aaf61bc..435260d308 100644
--- a/src/validationinterface.h
+++ b/src/validationinterface.h
@@ -156,8 +156,6 @@ protected:
      * Called on a background thread.
      */
     virtual void ChainStateFlushed(const CBlockLocator &locator) {}
-    /** Tells listeners to broadcast their data. */
-    virtual void ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman) {}
     /**
      * Notifies listeners of a block validation result.
      * If the provided CValidationState IsValid, the provided block
@@ -216,7 +214,6 @@ public:
     void NotifyRecoveredSig(const std::shared_ptr<const llmq::CRecoveredSig> &sig);
     void NotifyMasternodeListChanged(bool undo, const CDeterministicMNList& oldMNList, const CDeterministicMNListDiff& diff);
     void ChainStateFlushed(const CBlockLocator &);
-    void Broadcast(int64_t nBestBlockTime, CConnman* connman);
     void BlockChecked(const CBlock&, const CValidationState&);
     void NewPoWValidBlock(const CBlockIndex *, const std::shared_ptr<const CBlock>&);
 };
diff --git a/src/wallet/load.cpp b/src/wallet/load.cpp
index a7d5ad82ab..4b3f465f52 100644
--- a/src/wallet/load.cpp
+++ b/src/wallet/load.cpp
@@ -83,8 +83,9 @@ void StartWallets(CScheduler& scheduler)
         pwallet->postInitProcess();
     }
 
-    // Run a thread to flush wallet periodically
+    // Schedule periodic wallet flushes and tx rebroadcasts
     scheduler.scheduleEvery(MaybeCompactWalletDB, 500);
+    scheduler.scheduleEvery(MaybeResendWalletTxs, 1000);
 
     if (!fMasternodeMode && CCoinJoinClientOptions::IsEnabled()) {
         scheduler.scheduleEvery(std::bind(&DoCoinJoinMaintenance, std::ref(*g_connman)), 1 * 1000);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index c024c04614..a219acf0a4 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1473,6 +1473,10 @@ void CWallet::BlockDisconnected(const CBlock& block) {
     fAnonymizableTallyCachedNonDenom = false;
 }
 
+void CWallet::UpdatedBlockTip()
+{
+    m_best_block_time = GetTime();
+}
 
 
 void CWallet::BlockUntilSyncedToCurrentChain() {
@@ -2598,8 +2602,21 @@ bool CWalletTx::IsEquivalentTo(const CWalletTx& _tx) const
         return CTransaction(tx1) == CTransaction(tx2);
 }
 
-void CWallet::ResendWalletTransactions(interfaces::Chain::Lock& locked_chain, int64_t nBestBlockTime)
+// Rebroadcast transactions from the wallet. We do this on a random timer
+// to slightly obfuscate which transactions come from our wallet.
+//
+// Ideally, we'd only resend transactions that we think should have been
+// mined in the most recent block. Any transaction that wasn't in the top
+// blockweight of transactions in the mempool shouldn't have been mined,
+// and so is probably just sitting in the mempool waiting to be confirmed.
+// Rebroadcasting does nothing to speed up confirmation and only damages
+// privacy.
+void CWallet::ResendWalletTransactions()
 {
+    // During reindex, importing and IBD, old wallet transactions become
+    // unconfirmed. Don't resend them as that would spam other nodes.
+    if (!chain().isReadyToBroadcast()) return;
+
     // Do this infrequently and randomly to avoid giving away
     // that these are our transactions.
     if (GetTime() < nNextResend || !fBroadcastTransactions) return;
@@ -2608,12 +2625,13 @@ void CWallet::ResendWalletTransactions(interfaces::Chain::Lock& locked_chain, in
     if (fFirst) return;
 
     // Only do it if there's been a new block since last time
-    if (nBestBlockTime < nLastResend) return;
+    if (m_best_block_time < nLastResend) return;
     nLastResend = GetTime();
 
     int relayed_tx_count = 0;
 
-    { // mempool.cs and cs_wallet scope
+    { // locked_chain, mempool.cs and cs_wallet scope
+        auto locked_chain = chain().lock();
         LOCK2(mempool.cs, cs_wallet);
 
         // Relay transactions
@@ -2621,10 +2639,10 @@ void CWallet::ResendWalletTransactions(interfaces::Chain::Lock& locked_chain, in
             CWalletTx& wtx = item.second;
             // only rebroadcast unconfirmed txes older than 5 minutes before the
             // last block was found
-            if (wtx.nTimeReceived > nBestBlockTime - 5 * 60) continue;
-            relayed_tx_count += wtx.RelayWalletTransaction(*locked_chain) ? 1 : 0;
+            if (wtx.nTimeReceived > m_best_block_time - 5 * 60) continue;
+            if (wtx.RelayWalletTransaction(*locked_chain)) ++relayed_tx_count;
         }
-    } // mempool.cs and cs_wallet
+    } // locked_chain, mempool.cs and cs_wallet
 
     if (relayed_tx_count > 0) {
         WalletLogPrintf("%s: rebroadcast %u unconfirmed transactions\n", __func__, relayed_tx_count);
@@ -2633,7 +2651,12 @@ void CWallet::ResendWalletTransactions(interfaces::Chain::Lock& locked_chain, in
 
 /** @} */ // end of mapWallet
 
-
+void MaybeResendWalletTxs()
+{
+    for (const std::shared_ptr<CWallet>& pwallet : GetWallets()) {
+        pwallet->ResendWalletTransactions();
+    }
+}
 
 
 /** @defgroup Actions
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 5011195914..e17274c504 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -657,6 +657,8 @@ private:
     int64_t nNextResend = 0;
     int64_t nLastResend = 0;
     bool fBroadcastTransactions = false;
+    // Local time that the tip block was received. Used to schedule wallet rebroadcasts.
+    std::atomic<int64_t> m_best_block_time {0};
 
     mutable bool fAnonymizableTallyCached = false;
     mutable std::vector<CompactTallyItem> vecAnonymizableTallyCached;
@@ -983,6 +985,7 @@ public:
     void TransactionAddedToMempool(const CTransactionRef& tx, int64_t nAcceptTime) override;
     void BlockConnected(const CBlock& block, const std::vector<CTransactionRef>& vtxConflicted) override;
     void BlockDisconnected(const CBlock& block) override;
+    void UpdatedBlockTip() override;
     int64_t RescanFromTime(int64_t startTime, const WalletRescanReserver& reserver, bool update);
 
     struct ScanResult {
@@ -1003,7 +1006,7 @@ public:
     ScanResult ScanForWalletTransactions(const uint256& first_block, const uint256& last_block, const WalletRescanReserver& reserver, bool fUpdate);
     void TransactionRemovedFromMempool(const CTransactionRef &ptx, MemPoolRemovalReason reason) override;
     void ReacceptWalletTransactions();
-    void ResendWalletTransactions(interfaces::Chain::Lock& locked_chain, int64_t nBestBlockTime) override;
+    void ResendWalletTransactions();
     struct Balance {
         CAmount m_mine_trusted{0};           //!< Trusted, at depth=GetBalance.min_depth or more
         CAmount m_mine_untrusted_pending{0}; //!< Untrusted, but in mempool (pending)
@@ -1282,6 +1285,12 @@ public:
     bool GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info) const override;
 };
 
+/**
+ * Called periodically by the schedule thread. Prompts individual wallets to resend
+ * their transactions. Actual rebroadcast schedule is managed by the wallets themselves.
+ */
+void MaybeResendWalletTxs();
+
 /** A key allocated from the key pool. */
 class CReserveKey final : public CReserveScript
 {
diff --git a/test/functional/wallet_resendwallettransactions.py b/test/functional/wallet_resendwallettransactions.py
index d8f16eaba2..d4c50f8e9c 100755
--- a/test/functional/wallet_resendwallettransactions.py
+++ b/test/functional/wallet_resendwallettransactions.py
@@ -39,6 +39,12 @@ class ResendWalletTransactionsTest(BitcoinTestFramework):
         self.log.info("Create a new transaction and wait until it's broadcast")
         txid = int(node.sendtoaddress(node.getnewaddress(), 1), 16)
 
+        # Wallet rebroadcast is first scheduled 1 sec after startup (see
+        # nNextResend in ResendWalletTransactions()). Sleep for just over a
+        # second to be certain that it has been called before the first
+        # setmocktime call below.
+        time.sleep(1.1)
+
         # Can take a few seconds due to transaction trickling
         def wait_p2p():
             self.bump_mocktime(1)

From 77d4c515071cae0f804b786d405773912518ff94 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 10/17] merge bitcoin#15778: Move maxtxfee from node to wallet

---
 src/coinjoin/coinjoin.cpp  |  4 +++-
 src/coinjoin/server.cpp    |  3 ++-
 src/coinjoin/util.cpp      |  4 ++--
 src/dummywallet.cpp        |  1 +
 src/init.cpp               | 18 ------------------
 src/interfaces/chain.cpp   |  1 -
 src/interfaces/chain.h     |  6 ------
 src/interfaces/node.cpp    |  1 -
 src/interfaces/node.h      |  3 ---
 src/interfaces/wallet.cpp  |  1 +
 src/interfaces/wallet.h    |  3 +++
 src/qt/sendcoinsdialog.cpp |  2 +-
 src/qt/walletmodel.cpp     |  4 ++--
 src/validation.cpp         |  1 -
 src/validation.h           |  8 --------
 src/wallet/fees.cpp        |  2 +-
 src/wallet/init.cpp        |  6 ++----
 src/wallet/wallet.cpp      | 27 +++++++++++++++++++++++++--
 src/wallet/wallet.h        |  8 ++++++++
 19 files changed, 51 insertions(+), 52 deletions(-)

diff --git a/src/coinjoin/coinjoin.cpp b/src/coinjoin/coinjoin.cpp
index de7bac827b..4660fe1884 100644
--- a/src/coinjoin/coinjoin.cpp
+++ b/src/coinjoin/coinjoin.cpp
@@ -22,6 +22,8 @@
 
 #include <string>
 
+constexpr static CAmount DEFAULT_MAX_RAW_TX_FEE{COIN / 10};
+
 bool CCoinJoinEntry::AddScriptSig(const CTxIn& txin)
 {
     for (auto& txdsin : vecTxDSIn) {
@@ -370,7 +372,7 @@ bool CCoinJoin::IsCollateralValid(const CTransaction& txCollateral)
     {
         LOCK(cs_main);
         CValidationState validationState;
-        if (!AcceptToMemoryPool(mempool, validationState, MakeTransactionRef(txCollateral), nullptr /* pfMissingInputs */, false /* bypass_limits */, maxTxFee /* nAbsurdFee */, true /* fDryRun */)) {
+        if (!AcceptToMemoryPool(mempool, validationState, MakeTransactionRef(txCollateral), nullptr /* pfMissingInputs */, false /* bypass_limits */, DEFAULT_MAX_RAW_TX_FEE /* nAbsurdFee */, true /* fDryRun */)) {
             LogPrint(BCLog::COINJOIN, "CCoinJoin::IsCollateralValid -- didn't pass AcceptToMemoryPool()\n");
             return false;
         }
diff --git a/src/coinjoin/server.cpp b/src/coinjoin/server.cpp
index 419a048764..40497a2c13 100644
--- a/src/coinjoin/server.cpp
+++ b/src/coinjoin/server.cpp
@@ -23,6 +23,7 @@
 #include <univalue.h>
 
 CCoinJoinServer coinJoinServer;
+constexpr static CAmount DEFAULT_MAX_RAW_TX_FEE{COIN / 10};
 
 void CCoinJoinServer::ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStream& vRecv, CConnman& connman, bool enable_bip61)
 {
@@ -341,7 +342,7 @@ void CCoinJoinServer::CommitFinalTransaction(CConnman& connman)
         TRY_LOCK(cs_main, lockMain);
         CValidationState validationState;
         mempool.PrioritiseTransaction(hashTx, 0.1 * COIN);
-        if (!lockMain || !AcceptToMemoryPool(mempool, validationState, finalTransaction, nullptr /* pfMissingInputs */, false /* bypass_limits */, maxTxFee /* nAbsurdFee */)) {
+        if (!lockMain || !AcceptToMemoryPool(mempool, validationState, finalTransaction, nullptr /* pfMissingInputs */, false /* bypass_limits */, DEFAULT_MAX_RAW_TX_FEE /* nAbsurdFee */)) {
             LogPrint(BCLog::COINJOIN, "CCoinJoinServer::CommitFinalTransaction -- AcceptToMemoryPool() error: Transaction not valid\n");
             SetNull();
             // not much we can do in this case, just notify clients
diff --git a/src/coinjoin/util.cpp b/src/coinjoin/util.cpp
index 507019c84d..7ab33f5768 100644
--- a/src/coinjoin/util.cpp
+++ b/src/coinjoin/util.cpp
@@ -236,8 +236,8 @@ CAmount CTransactionBuilder::GetFee(unsigned int nBytes) const
     if (nRequiredFee > nFeeCalc) {
         nFeeCalc = nRequiredFee;
     }
-    if (nFeeCalc > ::maxTxFee) {
-        nFeeCalc = ::maxTxFee;
+    if (nFeeCalc > pwallet->m_default_max_tx_fee) {
+        nFeeCalc = pwallet->m_default_max_tx_fee;
     }
     return nFeeCalc;
 }
diff --git a/src/dummywallet.cpp b/src/dummywallet.cpp
index 3e52120005..0aaea5d596 100644
--- a/src/dummywallet.cpp
+++ b/src/dummywallet.cpp
@@ -37,6 +37,7 @@ void DummyWalletInit::AddWalletOptions() const
         "-disablewallet",
         "-instantsendnotify=<cmd>",
         "-keypool=<n>",
+        "-maxtxfee=<amt>",
         "-rescan=<mode>",
         "-salvagewallet",
         "-spendzeroconfchange",
diff --git a/src/init.cpp b/src/init.cpp
index 951bf81c36..dac1254d3e 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -685,8 +685,6 @@ void SetupServerArgs()
     gArgs.AddArg("-maxsigcachesize=<n>", strprintf("Limit sum of signature cache and script execution cache sizes to <n> MiB (default: %u)", DEFAULT_MAX_SIG_CACHE_SIZE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-maxtipage=<n>", strprintf("Maximum tip age in seconds to consider node in initial block download (default: %u)", DEFAULT_MAX_TIP_AGE), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-mocktime=<n>", "Replace actual time with <n> seconds since epoch (default: 0)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
-    gArgs.AddArg("-maxtxfee=<amt>", strprintf("Maximum total fees (in %s) to use in a single wallet transaction; setting this too low may abort large transactions (default: %s)",
-        CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST); // TODO move setting to wallet
     gArgs.AddArg("-minsporkkeys=<n>", "Overrides minimum spork signers to change spork value. Only useful for regtest and devnet. Using this on mainnet or testnet will ban you.", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-printpriority", strprintf("Log transaction fee per kB when mining blocks (default: %u)", DEFAULT_PRINTPRIORITY), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-printtoconsole", "Send trace/debug info to console (default: 1 when no -daemon. To disable logging to file, set -nodebuglogfile)", ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
@@ -1496,22 +1494,6 @@ bool AppInitParameterInteraction()
         dustRelayFee = CFeeRate(n);
     }
 
-    // This is required by both the wallet and node
-    if (gArgs.IsArgSet("-maxtxfee"))
-    {
-        CAmount nMaxFee = 0;
-        if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee))
-            return InitError(AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")));
-        if (nMaxFee > HIGH_MAX_TX_FEE)
-            InitWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
-        maxTxFee = nMaxFee;
-        if (CFeeRate(maxTxFee, 1000) < ::minRelayTxFee)
-        {
-            return InitError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
-                                       gArgs.GetArg("-maxtxfee", ""), ::minRelayTxFee.ToString()));
-        }
-    }
-
     fRequireStandard = !gArgs.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
     if (chainparams.RequireStandard() && !fRequireStandard)
         return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));
diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 53e7346cb0..0354a5c1ce 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -356,7 +356,6 @@ public:
     CFeeRate relayMinFee() override { return ::minRelayTxFee; }
     CFeeRate relayIncrementalFee() override { return ::incrementalRelayFee; }
     CFeeRate relayDustFee() override { return ::dustRelayFee; }
-    CAmount maxTxFee() override { return ::maxTxFee; }
     bool getPruneMode() override { return ::fPruneMode; }
     bool p2pEnabled() override { return g_connman != nullptr; }
     bool isReadyToBroadcast() override { return !::fImporting && !::fReindex && !::ChainstateActive().IsInitialBlockDownload(); }
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 72b431be68..2c125081d9 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -211,12 +211,6 @@ public:
     //! Relay dust fee setting (-dustrelayfee), reflecting lowest rate it's economical to spend.
     virtual CFeeRate relayDustFee() = 0;
 
-    //! Node max tx fee setting (-maxtxfee).
-    //! This could be replaced by a per-wallet max fee, as proposed at
-    //! https://github.com/bitcoin/bitcoin/issues/15355
-    //! But for the time being, wallets call this to access the node setting.
-    virtual CAmount maxTxFee() = 0;
-
     //! Check if pruning is enabled.
     virtual bool getPruneMode() = 0;
 
diff --git a/src/interfaces/node.cpp b/src/interfaces/node.cpp
index 5ae996d778..787cdd35f7 100644
--- a/src/interfaces/node.cpp
+++ b/src/interfaces/node.cpp
@@ -344,7 +344,6 @@ public:
         }
     }
     bool getNetworkActive() override { return g_connman && g_connman->GetNetworkActive(); }
-    CAmount getMaxTxFee() override { return ::maxTxFee; }
     CFeeRate estimateSmartFee(int num_blocks, bool conservative, int* returned_target = nullptr) override
     {
         FeeCalculation fee_calc;
diff --git a/src/interfaces/node.h b/src/interfaces/node.h
index ec6a41f068..9c892708d2 100644
--- a/src/interfaces/node.h
+++ b/src/interfaces/node.h
@@ -229,9 +229,6 @@ public:
     //! Get network active.
     virtual bool getNetworkActive() = 0;
 
-    //! Get max tx fee.
-    virtual CAmount getMaxTxFee() = 0;
-
     //! Estimate smart fee.
     virtual CFeeRate estimateSmartFee(int num_blocks, bool conservative, int* returned_target = nullptr) = 0;
 
diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index bb49f9bf73..4419cca9e8 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -544,6 +544,7 @@ public:
     bool hdEnabled() override { return m_wallet->IsHDEnabled(); }
     bool IsWalletFlagSet(uint64_t flag) override { return m_wallet->IsWalletFlagSet(flag); }
     CoinJoin::Client& coinJoin() override { return m_coinjoin; }
+    CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }
     void remove() override
     {
         RemoveWallet(m_wallet);
diff --git a/src/interfaces/wallet.h b/src/interfaces/wallet.h
index 6eff7991c1..4a538bf59a 100644
--- a/src/interfaces/wallet.h
+++ b/src/interfaces/wallet.h
@@ -266,6 +266,9 @@ public:
 
     virtual CoinJoin::Client& coinJoin() = 0;
 
+    //! Get max tx fee.
+    virtual CAmount getDefaultMaxTxFee() = 0;
+
     // Remove wallet.
     virtual void remove() = 0;
 
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 7dc2658b9c..2179d2f199 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -666,7 +666,7 @@ void SendCoinsDialog::processSendCoinsReturn(const WalletModel::SendCoinsReturn
         msgParams.second = CClientUIInterface::MSG_ERROR;
         break;
     case WalletModel::AbsurdFee:
-        msgParams.first = tr("A fee higher than %1 is considered an absurdly high fee.").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), model->node().getMaxTxFee()));
+        msgParams.first = tr("A fee higher than %1 is considered an absurdly high fee.").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), model->wallet().getDefaultMaxTxFee()));
         break;
     case WalletModel::PaymentRequestExpired:
         msgParams.first = tr("Payment request expired.");
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 20094194e4..556bdcb8c2 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -270,9 +270,9 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
     }
 
     // reject absurdly high fee. (This can never happen because the
-    // wallet caps the fee at maxTxFee. This merely serves as a
+    // wallet caps the fee at m_default_max_tx_fee. This merely serves as a
     // belt-and-suspenders check)
-    if (nFeeRequired > m_node.getMaxTxFee())
+    if (nFeeRequired > m_wallet->getDefaultMaxTxFee())
         return AbsurdFee;
 
     return SendCoinsReturn(OK);
diff --git a/src/validation.cpp b/src/validation.cpp
index 021323b17d..d506fd7016 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -156,7 +156,6 @@ uint256 hashAssumeValid;
 arith_uint256 nMinimumChainWork;
 
 CFeeRate minRelayTxFee = CFeeRate(DEFAULT_MIN_RELAY_TX_FEE);
-CAmount maxTxFee = DEFAULT_TRANSACTION_MAXFEE;
 
 CBlockPolicyEstimator feeEstimator;
 CTxMemPool mempool(&feeEstimator);
diff --git a/src/validation.h b/src/validation.h
index 949b07c953..f0c079a123 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -53,12 +53,6 @@ struct LockPoints;
 
 /** Default for -minrelaytxfee, minimum relay fee for transactions */
 static const unsigned int DEFAULT_MIN_RELAY_TX_FEE = 1000;
-//! -maxtxfee default
-static const CAmount DEFAULT_TRANSACTION_MAXFEE = COIN / 10;
-//! Discourage users to set fees higher than this amount (in duffs) per kB
-static const CAmount HIGH_TX_FEE_PER_KB = COIN / 100;
-//! -maxtxfee will warn if called with a higher fee than this amount (in duffs)
-static const CAmount HIGH_MAX_TX_FEE = 100 * HIGH_TX_FEE_PER_KB;
 /** Default for -limitancestorcount, max number of in-mempool ancestors */
 static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
 /** Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool ancestors */
@@ -146,8 +140,6 @@ extern bool fCheckpointsEnabled;
 extern size_t nCoinCacheUsage;
 /** A fee rate smaller than this is considered zero fee (for relaying, mining and transaction creation) */
 extern CFeeRate minRelayTxFee;
-/** Absolute maximum transaction fee (in duffs) used by wallet and mempool (rejects high fee in sendrawtransaction) */
-extern CAmount maxTxFee;
 /** If the tip is older than this (in seconds), the node is considered to be in initial block download. */
 extern int64_t nMaxTipAge;
 
diff --git a/src/wallet/fees.cpp b/src/wallet/fees.cpp
index 8ef9ee28f5..566bbe85d1 100644
--- a/src/wallet/fees.cpp
+++ b/src/wallet/fees.cpp
@@ -22,7 +22,7 @@ CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinC
 {
     CAmount fee_needed = GetMinimumFeeRate(wallet, coin_control, feeCalc).GetFee(nTxBytes);
     // Always obey the maximum
-    const CAmount max_tx_fee = wallet.chain().maxTxFee();
+    const CAmount max_tx_fee = wallet.m_default_max_tx_fee;
     if (fee_needed > max_tx_fee) {
         fee_needed = max_tx_fee;
         if (feeCalc) feeCalc->reason = FeeReason::MAXTXFEE;
diff --git a/src/wallet/init.cpp b/src/wallet/init.cpp
index 8e7fbe7287..b057220416 100644
--- a/src/wallet/init.cpp
+++ b/src/wallet/init.cpp
@@ -71,6 +71,8 @@ void WalletInit::AddWalletOptions() const
                                                               CURRENCY_UNIT, FormatMoney(DEFAULT_DISCARD_FEE)), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET_FEE);
     gArgs.AddArg("-fallbackfee=<amt>", strprintf("A fee rate (in %s/kB) that will be used when fee estimation has insufficient data (default: %s)",
                                                                CURRENCY_UNIT, FormatMoney(DEFAULT_FALLBACK_FEE)), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET_FEE);
+    gArgs.AddArg("-maxtxfee=<amt>", strprintf("Maximum total fees (in %s) to use in a single wallet transaction; setting this too low may abort large transactions (default: %s)",
+                                                            CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MAXFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-mintxfee=<amt>", strprintf("Fees (in %s/kB) smaller than this are considered zero fee for transaction creation (default: %s)",
                                                             CURRENCY_UNIT, FormatMoney(DEFAULT_TRANSACTION_MINFEE)), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET_FEE);
     gArgs.AddArg("-paytxfee=<amt>", strprintf("Fee (in %s/kB) to add to transactions you send (default: %s)",
@@ -165,10 +167,6 @@ bool WalletInit::ParameterInteraction() const
     if (gArgs.GetArg("-prune", 0) && gArgs.GetBoolArg("-rescan", false))
         return InitError(_("Rescans are not possible in pruned mode. You will need to use -reindex which will download the whole blockchain again."));
 
-    if (::minRelayTxFee.GetFeePerK() > HIGH_TX_FEE_PER_KB)
-        InitWarning(AmountHighWarn("-minrelaytxfee") + " " +
-                    _("The wallet will avoid paying less than the minimum relay fee."));
-
     if (gArgs.IsArgSet("-walletbackupsdir")) {
         if (!fs::is_directory(gArgs.GetArg("-walletbackupsdir", ""))) {
             InitWarning(strprintf(_("Warning: incorrect parameter %s, path must exist! Using default path."), "-walletbackupsdir"));
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index a219acf0a4..4ef81c7336 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -3066,7 +3066,7 @@ bool CWallet::SelectCoinsMinConf(const CAmount& nTargetValue, const CoinEligibil
             utxo_pool.push_back(group);
         }
         bnb_used = false;
-        return KnapsackSolver(nTargetValue, utxo_pool, setCoinsRet, nValueRet, nCoinType == CoinType::ONLY_FULLY_MIXED, maxTxFee);
+        return KnapsackSolver(nTargetValue, utxo_pool, setCoinsRet, nValueRet, nCoinType == CoinType::ONLY_FULLY_MIXED, m_default_max_tx_fee);
     }
 }
 
@@ -5120,6 +5120,29 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
             return nullptr;
         }
     }
+
+    if (gArgs.IsArgSet("-maxtxfee"))
+    {
+        CAmount nMaxFee = 0;
+        if (!ParseMoney(gArgs.GetArg("-maxtxfee", ""), nMaxFee)) {
+            chain.initError(AmountErrMsg("maxtxfee", gArgs.GetArg("-maxtxfee", "")));
+            return nullptr;
+        }
+        if (nMaxFee > HIGH_MAX_TX_FEE) {
+            chain.initWarning(_("-maxtxfee is set very high! Fees this large could be paid on a single transaction."));
+        }
+        if (CFeeRate(nMaxFee, 1000) < chain.relayMinFee()) {
+            chain.initError(strprintf(_("Invalid amount for -maxtxfee=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
+                                       gArgs.GetArg("-maxtxfee", ""), chain.relayMinFee().ToString()));
+            return nullptr;
+        }
+        walletInstance->m_default_max_tx_fee = nMaxFee;
+    }
+
+    if (chain.relayMinFee().GetFeePerK() > HIGH_TX_FEE_PER_KB)
+        chain.initWarning(AmountHighWarn("-minrelaytxfee") + " " +
+                    _("The wallet will avoid paying less than the minimum relay fee."));
+
     walletInstance->m_confirm_target = gArgs.GetArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
     walletInstance->m_spend_zero_conf_change = gArgs.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
 
@@ -5528,7 +5551,7 @@ bool CWalletTx::AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, CValid
     // user could call sendmoney in a loop and hit spurious out of funds errors
     // because we think that this newly generated transaction's change is
     // unavailable as we're not yet aware that it is in the mempool.
-    bool ret = locked_chain.submitToMemoryPool(tx, pwallet->chain().maxTxFee(), state);
+    bool ret = locked_chain.submitToMemoryPool(tx, pwallet->m_default_max_tx_fee, state);
     fInMempool |= ret;
     return ret;
 }
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index e17274c504..aaf25edb75 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -74,6 +74,12 @@ static const bool DEFAULT_AVOIDPARTIALSPENDS = false;
 static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 6;
 static const bool DEFAULT_WALLETBROADCAST = true;
 static const bool DEFAULT_DISABLE_WALLET = false;
+//! -maxtxfee default
+static const CAmount DEFAULT_TRANSACTION_MAXFEE = COIN / 10;
+//! Discourage users to set fees higher than this amount (in duffs) per kB
+static const CAmount HIGH_TX_FEE_PER_KB = COIN / 100;
+//! -maxtxfee will warn if called with a higher fee than this amount (in duffs)
+static const CAmount HIGH_MAX_TX_FEE = 100 * HIGH_TX_FEE_PER_KB;
 
 //! if set, all keys will be derived by using BIP39/BIP44
 static const bool DEFAULT_USE_HD_WALLET = false;
@@ -1065,6 +1071,8 @@ public:
      */
     CFeeRate m_fallback_fee{DEFAULT_FALLBACK_FEE};
     CFeeRate m_discard_rate{DEFAULT_DISCARD_FEE};
+    /** Absolute maximum transaction fee (in satoshis) used by default for the wallet */
+    CAmount m_default_max_tx_fee{DEFAULT_TRANSACTION_MAXFEE};
 
     bool NewKeyPool();
     size_t KeypoolCountExternalKeys() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

From 0187d2e597c81fb72f30b785b6ba52f8c1da36b9 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 22:36:50 +0530
Subject: [PATCH 11/17] merge bitcoin#15713: Replace chain
 relayTransactions/submitMemoryPool by higher method

---
 src/interfaces/chain.cpp   | 16 ++++-----
 src/interfaces/chain.h     | 15 +++------
 src/node/transaction.cpp   | 60 +++++++++++++++++++---------------
 src/node/transaction.h     | 15 ++++++---
 src/rpc/rawtransaction.cpp |  6 ++--
 src/wallet/wallet.cpp      | 67 +++++++++++++++-----------------------
 src/wallet/wallet.h        |  7 ++--
 7 files changed, 87 insertions(+), 99 deletions(-)

diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 0354a5c1ce..760e39ee29 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -11,6 +11,7 @@
 #include <interfaces/wallet.h>
 #include <net.h>
 #include <node/coin.h>
+#include <node/transaction.h>
 #include <policy/fees.h>
 #include <policy/policy.h>
 #include <primitives/block.h>
@@ -170,12 +171,6 @@ class LockImpl : public Chain::Lock
         LockAnnotation lock(::cs_main);
         return CheckFinalTx(tx);
     }
-    bool submitToMemoryPool(const CTransactionRef& tx, CAmount absurd_fee, CValidationState& state) override
-    {
-        LockAnnotation lock(::cs_main);
-        return AcceptToMemoryPool(::mempool, state, tx, nullptr /* missing inputs */,
-            false /* bypass limits */, absurd_fee);
-    }
 };
 
 class LockingStateImpl : public LockImpl, public UniqueLock<CCriticalSection>
@@ -318,10 +313,13 @@ public:
         auto it = ::mempool.GetIter(txid);
         return it && (*it)->GetCountWithDescendants() > 1;
     }
-    void relayTransaction(const uint256& txid) override
+    bool broadcastTransaction(const CTransactionRef& tx, std::string& err_string, const CAmount& max_tx_fee, bool relay) override
     {
-        CInv inv(CCoinJoin::GetDSTX(txid) ? MSG_DSTX : MSG_TX, txid);
-        g_connman->ForEachNode([&inv](CNode* node) { node->PushInventory(inv); });
+        const TransactionError err = BroadcastTransaction(tx, err_string, max_tx_fee, relay, /*wait_callback*/ false);
+        // Chain clients only care about failures to accept the tx to the mempool. Disregard non-mempool related failures.
+        // Note: this will need to be updated if BroadcastTransactions() is updated to return other non-mempool failures
+        // that Chain clients do not need to know about.
+        return TransactionError::OK == err;
     }
     void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) override
     {
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index 2c125081d9..a863469a38 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -52,10 +52,6 @@ class Handler;
 //!   asynchronously
 //!   (https://github.com/bitcoin/bitcoin/pull/10973#issuecomment-380101269).
 //!
-//! * The relayTransactions() and submitToMemoryPool() methods could be replaced
-//!   with a higher-level broadcastTransaction method
-//!   (https://github.com/bitcoin/bitcoin/pull/14978#issuecomment-459373984).
-//!
 //! * The initMessages() and loadWallet() methods which the wallet uses to send
 //!   notifications to the GUI should go away when GUI and wallet can directly
 //!   communicate with each other without going through the node
@@ -145,11 +141,6 @@ public:
 
         //! Check if transaction will be final given chain height current time.
         virtual bool checkFinalTx(const CTransaction& tx) = 0;
-
-        //! Add transaction to memory pool if the transaction fee is below the
-        //! amount specified by absurd_fee. Returns false if the transaction
-        //! could not be added due to the fee or for another reason.
-        virtual bool submitToMemoryPool(const CTransactionRef& tx, CAmount absurd_fee, CValidationState& state) = 0;
     };
 
     //! Return Lock interface. Chain is locked when this is called, and
@@ -184,8 +175,10 @@ public:
     //! Check if transaction has descendants in mempool.
     virtual bool hasDescendantsInMempool(const uint256& txid) = 0;
 
-    //! Relay transaction.
-    virtual void relayTransaction(const uint256& txid) = 0;
+    //! Transaction is added to memory pool, if the transaction fee is below the
+    //! amount specified by max_tx_fee, and broadcast to all peers if relay is set to true.
+    //! Return false if the transaction could not be added due to the fee or for another reason.
+    virtual bool broadcastTransaction(const CTransactionRef& tx, std::string& err_string, const CAmount& max_tx_fee, bool relay) = 0;
 
     //! Calculate mempool ancestor and descendant counts for the given transaction.
     virtual void getTransactionAncestry(const uint256& txid, size_t& ancestors, size_t& descendants) = 0;
diff --git a/src/node/transaction.cpp b/src/node/transaction.cpp
index da8b5ec53a..b1be5eda77 100644
--- a/src/node/transaction.cpp
+++ b/src/node/transaction.cpp
@@ -13,26 +13,30 @@
 
 #include <future>
 
-TransactionError BroadcastTransaction(const CTransactionRef tx, uint256& hashTx, std::string& err_string, const CAmount& highfee, const bool bypass_limits)
+TransactionError BroadcastTransaction(const CTransactionRef tx, std::string& err_string, const CAmount& max_tx_fee, bool relay, bool wait_callback, bool bypass_limits)
 {
+    assert(g_connman);
     std::promise<void> promise;
-    hashTx = tx->GetHash();
+    uint256 hashTx = tx->GetHash();
+    bool callback_set = false;
 
     { // cs_main scope
     LOCK(cs_main);
+    // If the transaction is already confirmed in the chain, don't do anything
+    // and return early.
     CCoinsViewCache &view = ::ChainstateActive().CoinsTip();
-    bool fHaveChain = false;
-    for (size_t o = 0; !fHaveChain && o < tx->vout.size(); o++) {
+    for (size_t o = 0; o < tx->vout.size(); o++) {
         const Coin& existingCoin = view.AccessCoin(COutPoint(hashTx, o));
-        fHaveChain = !existingCoin.IsSpent();
+        // IsSpent doesnt mean the coin is spent, it means the output doesnt' exist.
+        // So if the output does exist, then this transaction exists in the chain.
+        if (!existingCoin.IsSpent()) return TransactionError::ALREADY_IN_CHAIN;
     }
-    bool fHaveMempool = mempool.exists(hashTx);
-    if (!fHaveMempool && !fHaveChain) {
-        // push to local node and sync with wallets
+    if (!mempool.exists(hashTx)) {
+        // Transaction is not already in the mempool. Submit it.
         CValidationState state;
         bool fMissingInputs;
         if (!AcceptToMemoryPool(mempool, state, std::move(tx), &fMissingInputs,
-                                bypass_limits, highfee)) {
+                                bypass_limits, max_tx_fee)) {
             if (state.IsInvalid()) {
                 err_string = FormatStateMessage(state);
                 return TransactionError::MEMPOOL_REJECTED;
@@ -43,33 +47,37 @@ TransactionError BroadcastTransaction(const CTransactionRef tx, uint256& hashTx,
                 err_string = FormatStateMessage(state);
                 return TransactionError::MEMPOOL_ERROR;
             }
-        } else {
-            // If wallet is enabled, ensure that the wallet has been made aware
-            // of the new transaction prior to returning. This prevents a race
-            // where a user might call sendrawtransaction with a transaction
-            // to/from their wallet, immediately call some wallet RPC, and get
-            // a stale result because callbacks have not yet been processed.
+        }
+
+        // Transaction was accepted to the mempool.
+
+        if (wait_callback) {
+            // For transactions broadcast from outside the wallet, make sure
+            // that the wallet has been notified of the transaction before
+            // continuing.
+            //
+            // This prevents a race where a user might call sendrawtransaction
+            // with a transaction to/from their wallet, immediately call some
+            // wallet RPC, and get a stale result because callbacks have not
+            // yet been processed.
             CallFunctionInValidationInterfaceQueue([&promise] {
                 promise.set_value();
             });
+            callback_set = true;
         }
-    } else if (fHaveChain) {
-        return TransactionError::ALREADY_IN_CHAIN;
-    } else {
-        // Make sure we don't block forever if re-sending
-        // a transaction already in mempool.
-        promise.set_value();
     }
 
     } // cs_main
 
-    promise.get_future().wait();
-
-    if (!g_connman) {
-        return TransactionError::P2P_DISABLED;
+    if (callback_set) {
+        // Wait until Validation Interface clients have been notified of the
+        // transaction entering the mempool.
+        promise.get_future().wait();
     }
 
-    g_connman->RelayTransaction(*tx);
+    if (relay) {
+        g_connman->RelayTransaction(*tx);
+    }
 
     return TransactionError::OK;
 }
diff --git a/src/node/transaction.h b/src/node/transaction.h
index 7404334001..de6699197f 100644
--- a/src/node/transaction.h
+++ b/src/node/transaction.h
@@ -11,14 +11,21 @@
 #include <util/error.h>
 
 /**
- * Broadcast a transaction
+ * Submit a transaction to the mempool and (optionally) relay it to all P2P peers.
+ *
+ * Mempool submission can be synchronous (will await mempool entry notification
+ * over the CValidationInterface) or asynchronous (will submit and not wait for
+ * notification), depending on the value of wait_callback. wait_callback MUST
+ * NOT be set while cs_main, cs_mempool or cs_wallet are held to avoid
+ * deadlock.
  *
  * @param[in]  tx the transaction to broadcast
- * @param[out] &txid the txid of the transaction, if successfully broadcast
  * @param[out] &err_string reference to std::string to fill with error string if available
- * @param[in]  highfee Reject txs with fees higher than this (if 0, accept any fee)
+ * @param[in]  max_tx_fee reject txs with fees higher than this (if 0, accept any fee)
+ * @param[in]  relay flag if both mempool insertion and p2p relay are requested
+ * @param[in]  wait_callback, wait until callbacks have been processed to avoid stale result due to a sequentially RPC.
  * return error
  */
-[[nodiscard]] TransactionError BroadcastTransaction(CTransactionRef tx, uint256& txid, std::string& err_string, const CAmount& highfee, const bool bypass_limits = false);
+[[nodiscard]] TransactionError BroadcastTransaction(CTransactionRef tx, std::string& err_string, const CAmount& highfee, bool relay, bool wait_callback, bool bypass_limits = false);
 
 #endif // BITCOIN_NODE_TRANSACTION_H
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index 82ce458af7..cc29103c70 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -809,14 +809,14 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
 
     bool bypass_limits = false;
     if (!request.params[3].isNull()) bypass_limits = request.params[3].get_bool();
-    uint256 txid;
     std::string err_string;
-    const TransactionError err = BroadcastTransaction(tx, txid, err_string, max_raw_tx_fee, bypass_limits);
+    AssertLockNotHeld(cs_main);
+    const TransactionError err = BroadcastTransaction(tx, err_string, max_raw_tx_fee, /* relay */ true, /* wait_callback */ true, bypass_limits);
     if (TransactionError::OK != err) {
         throw JSONRPCTransactionError(err, err_string);
     }
 
-    return txid.GetHex();
+    return tx->GetHash().GetHex();
 }
 
 static UniValue testmempoolaccept(const JSONRPCRequest& request)
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 4ef81c7336..e6d5e21d89 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -2265,8 +2265,7 @@ void CWallet::ReacceptWalletTransactions()
     std::map<int64_t, CWalletTx*> mapSorted;
 
     // Sort pending wallet transactions based on their initial wallet insertion order
-    for (std::pair<const uint256, CWalletTx>& item : mapWallet)
-    {
+    for (std::pair<const uint256, CWalletTx>& item : mapWallet) {
         const uint256& wtxid = item.first;
         CWalletTx& wtx = item.second;
         assert(wtx.GetHash() == wtxid);
@@ -2281,32 +2280,31 @@ void CWallet::ReacceptWalletTransactions()
     // Try to add wallet transactions to memory pool
     for (const std::pair<const int64_t, CWalletTx*>& item : mapSorted) {
         CWalletTx& wtx = *(item.second);
-        CValidationState state;
-        wtx.AcceptToMemoryPool(*locked_chain, state);
+        std::string unused_err_string;
+        wtx.SubmitMemoryPoolAndRelay(unused_err_string, false, *locked_chain);
     }
 }
 
-bool CWalletTx::RelayWalletTransaction(interfaces::Chain::Lock& locked_chain)
+bool CWalletTx::SubmitMemoryPoolAndRelay(std::string& err_string, bool relay, interfaces::Chain::Lock& locked_chain)
 {
     // Can't relay if wallet is not broadcasting
     if (!pwallet->GetBroadcastTransactions()) return false;
-    // Don't relay coinbase transactions outside blocks
-    if (IsCoinBase()) return false;
     // Don't relay abandoned transactions
     if (isAbandoned()) return false;
-    // Don't relay conflicted or already confirmed transactions
-    if (GetDepthInMainChain(locked_chain) != 0) return false;
-    // Don't relay transactions that aren't accepted to the mempool
-    CValidationState unused_state;
-    if (!InMempool() && !AcceptToMemoryPool(locked_chain, unused_state)) return false;
-    // Don't try to relay if the node is not connected to the p2p network
-    if (!pwallet->chain().p2pEnabled()) return false;
-
-    // Try to relay the transaction
-    pwallet->WalletLogPrintf("Relaying wtx %s\n", GetHash().ToString());
-    pwallet->chain().relayTransaction(GetHash());
-
-    return true;
+    // Submit transaction to mempool for relay
+    pwallet->WalletLogPrintf("Submitting wtx %s to mempool for relay\n", GetHash().ToString());
+    // We must set fInMempool here - while it will be re-set to true by the
+    // entered-mempool callback, if we did not there would be a race where a
+    // user could call sendmoney in a loop and hit spurious out of funds errors
+    // because we think that this newly generated transaction's change is
+    // unavailable as we're not yet aware that it is in the mempool.
+    //
+    // Irrespective of the failure reason, un-marking fInMempool
+    // out-of-order is incorrect - it should be unmarked when
+    // TransactionRemovedFromMempool fires.
+    bool ret = pwallet->chain().broadcastTransaction(tx, err_string, pwallet->m_default_max_tx_fee, relay);
+    fInMempool |= ret;
+    return ret;
 }
 
 std::set<uint256> CWalletTx::GetConflicts() const
@@ -2628,7 +2626,7 @@ void CWallet::ResendWalletTransactions()
     if (m_best_block_time < nLastResend) return;
     nLastResend = GetTime();
 
-    int relayed_tx_count = 0;
+    int submitted_tx_count = 0;
 
     { // locked_chain, mempool.cs and cs_wallet scope
         auto locked_chain = chain().lock();
@@ -2640,12 +2638,13 @@ void CWallet::ResendWalletTransactions()
             // only rebroadcast unconfirmed txes older than 5 minutes before the
             // last block was found
             if (wtx.nTimeReceived > m_best_block_time - 5 * 60) continue;
-            if (wtx.RelayWalletTransaction(*locked_chain)) ++relayed_tx_count;
+            std::string unused_err_string;
+            if (wtx.SubmitMemoryPoolAndRelay(unused_err_string, true, *locked_chain)) ++submitted_tx_count;
         }
     } // locked_chain, mempool.cs and cs_wallet
 
-    if (relayed_tx_count > 0) {
-        WalletLogPrintf("%s: rebroadcast %u unconfirmed transactions\n", __func__, relayed_tx_count);
+    if (submitted_tx_count > 0) {
+        WalletLogPrintf("%s: resubmit %u unconfirmed transactions\n", __func__, submitted_tx_count);
     }
 }
 
@@ -3950,12 +3949,10 @@ bool CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::ve
 
         if (fBroadcastTransactions)
         {
-            // Broadcast
-            if (!wtx.AcceptToMemoryPool(*locked_chain, state)) {
-                WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", FormatStateMessage(state));
+            std::string err_string;
+            if (!wtx.SubmitMemoryPoolAndRelay(err_string, true, *locked_chain)) {
+                WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", err_string);
                 // TODO: if we expect the failure to be long term or permanent, instead delete wtx from the wallet and return failure.
-            } else {
-                wtx.RelayWalletTransaction(*locked_chain);
             }
         }
     }
@@ -5544,18 +5541,6 @@ bool CMerkleTx::IsImmatureCoinBase(interfaces::Chain::Lock& locked_chain) const
     return GetBlocksToMaturity(locked_chain) > 0;
 }
 
-bool CWalletTx::AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, CValidationState& state)
-{
-    // We must set fInMempool here - while it will be re-set to true by the
-    // entered-mempool callback, if we did not there would be a race where a
-    // user could call sendmoney in a loop and hit spurious out of funds errors
-    // because we think that this newly generated transaction's change is
-    // unavailable as we're not yet aware that it is in the mempool.
-    bool ret = locked_chain.submitToMemoryPool(tx, pwallet->m_default_max_tx_fee, state);
-    fInMempool |= ret;
-    return ret;
-}
-
 std::vector<OutputGroup> CWallet::GroupOutputs(const std::vector<COutput>& outputs, bool single_coin) const {
     std::vector<OutputGroup> groups;
     std::map<CTxDestination, OutputGroup> gmap;
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index aaf25edb75..cbb4669e62 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -526,11 +526,8 @@ public:
 
     int64_t GetTxTime() const;
 
-    // Pass this transaction to the node to relay to its peers
-    bool RelayWalletTransaction(interfaces::Chain::Lock& locked_chain);
-
-    /** Pass this transaction to the mempool. Fails if absolute fee exceeds absurd fee. */
-    bool AcceptToMemoryPool(interfaces::Chain::Lock& locked_chain, CValidationState& state);
+    // Pass this transaction to node for mempool insertion and relay to peers if flag set to true
+    bool SubmitMemoryPoolAndRelay(std::string& err_string, bool relay, interfaces::Chain::Lock& locked_chain);
 
     // TODO: Remove "NO_THREAD_SAFETY_ANALYSIS" and replace it with the correct
     // annotation "EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)". The annotation

From 4bc0ae1ee2f45dec99d91c1c9d0cbef96141cc45 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 12/17] merge bitcoin#16033: Hold cs_main when reading
 chainActive via getTipLocator(). Remove assumeLocked().

---
 src/interfaces/chain.cpp         | 10 +++-------
 src/interfaces/chain.h           |  5 -----
 src/wallet/test/wallet_tests.cpp | 31 +++++++++++++++++++------------
 src/wallet/wallet.cpp            |  2 +-
 4 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 760e39ee29..df8f6c7fb7 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -38,7 +38,7 @@
 namespace interfaces {
 namespace {
 
-class LockImpl : public Chain::Lock
+class LockImpl : public Chain::Lock, public UniqueLock<CCriticalSection>
 {
     Optional<int> getHeight() override
     {
@@ -171,10 +171,7 @@ class LockImpl : public Chain::Lock
         LockAnnotation lock(::cs_main);
         return CheckFinalTx(tx);
     }
-};
 
-class LockingStateImpl : public LockImpl, public UniqueLock<CCriticalSection>
-{
     using UniqueLock::UniqueLock;
 };
 
@@ -273,13 +270,12 @@ class ChainImpl : public Chain
 public:
     std::unique_ptr<Chain::Lock> lock(bool try_lock) override
     {
-        auto result = MakeUnique<LockingStateImpl>(::cs_main, "cs_main", __FILE__, __LINE__, try_lock);
+        auto result = MakeUnique<LockImpl>(::cs_main, "cs_main", __FILE__, __LINE__, try_lock);
         if (try_lock && result && !*result) return {};
         // std::move necessary on some compilers due to conversion from
-        // LockingStateImpl to Lock pointer
+        // LockImpl to Lock pointer
         return std::move(result);
     }
-    std::unique_ptr<Chain::Lock> assumeLocked() override { return MakeUnique<LockImpl>(); }
     bool findBlock(const uint256& hash, CBlock* block, int64_t* time, int64_t* time_max) override
     {
         CBlockIndex* index;
diff --git a/src/interfaces/chain.h b/src/interfaces/chain.h
index a863469a38..10f1b3064d 100644
--- a/src/interfaces/chain.h
+++ b/src/interfaces/chain.h
@@ -147,11 +147,6 @@ public:
     //! unlocked when the returned interface is freed.
     virtual std::unique_ptr<Lock> lock(bool try_lock = false) = 0;
 
-    //! Return Lock interface assuming chain is already locked. This
-    //! method is temporary and is only used in a few places to avoid changing
-    //! behavior while code is transitioned to use the Chain::Lock interface.
-    virtual std::unique_ptr<Lock> assumeLocked() = 0;
-
     //! Return whether node has the block and optionally return block metadata
     //! or contents.
     //!
diff --git a/src/wallet/test/wallet_tests.cpp b/src/wallet/test/wallet_tests.cpp
index d19fb19830..d5f43dd761 100644
--- a/src/wallet/test/wallet_tests.cpp
+++ b/src/wallet/test/wallet_tests.cpp
@@ -369,7 +369,10 @@ public:
         int changePos = -1;
         std::string error;
         CCoinControl dummy;
-        BOOST_CHECK(wallet->CreateTransaction(*m_locked_chain, {recipient}, tx, reservekey, fee, changePos, error, dummy));
+        {
+            auto locked_chain = m_chain->lock();
+            BOOST_CHECK(wallet->CreateTransaction(*locked_chain, {recipient}, tx, reservekey, fee, changePos, error, dummy));
+        }
         CValidationState state;
         BOOST_CHECK(wallet->CommitTransaction(tx, {}, {}, reservekey, state));
         CMutableTransaction blocktx;
@@ -388,7 +391,6 @@ public:
     }
 
     std::unique_ptr<interfaces::Chain> m_chain = interfaces::MakeChain();
-    std::unique_ptr<interfaces::Chain::Lock> m_locked_chain = m_chain->assumeLocked();  // Temporary. Removed in upcoming lock cleanup
     std::unique_ptr<CWallet> wallet;
 };
 
@@ -400,8 +402,9 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
     // address.
     std::map<CTxDestination, std::vector<COutput>> list;
     {
-        LOCK2(cs_main, wallet->cs_wallet);
-        list = wallet->ListCoins(*m_locked_chain);
+        auto locked_chain = m_chain->lock();
+        LOCK(wallet->cs_wallet);
+        list = wallet->ListCoins(*locked_chain);
     }
     BOOST_CHECK_EQUAL(list.size(), 1U);
     BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
@@ -416,8 +419,9 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
     // pubkey.
     AddTx(CRecipient{GetScriptForRawPubKey({}), 1 * COIN, false /* subtract fee */});
     {
-        LOCK2(cs_main, wallet->cs_wallet);
-        list = wallet->ListCoins(*m_locked_chain);
+        auto locked_chain = m_chain->lock();
+        LOCK(wallet->cs_wallet);
+        list = wallet->ListCoins(*locked_chain);
     }
     BOOST_CHECK_EQUAL(list.size(), 1U);
     BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
@@ -425,9 +429,10 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
 
     // Lock both coins. Confirm number of available coins drops to 0.
     {
-        LOCK2(cs_main, wallet->cs_wallet);
+        auto locked_chain = m_chain->lock();
+        LOCK(wallet->cs_wallet);
         std::vector<COutput> available;
-        wallet->AvailableCoins(*m_locked_chain, available);
+        wallet->AvailableCoins(*locked_chain, available);
         BOOST_CHECK_EQUAL(available.size(), 2U);
     }
     for (const auto& group : list) {
@@ -437,16 +442,18 @@ BOOST_FIXTURE_TEST_CASE(ListCoins, ListCoinsTestingSetup)
         }
     }
     {
-        LOCK2(cs_main, wallet->cs_wallet);
+        auto locked_chain = m_chain->lock();
+        LOCK(wallet->cs_wallet);
         std::vector<COutput> available;
-        wallet->AvailableCoins(*m_locked_chain, available);
+        wallet->AvailableCoins(*locked_chain, available);
         BOOST_CHECK_EQUAL(available.size(), 0U);
     }
     // Confirm ListCoins still returns same result as before, despite coins
     // being locked.
     {
-        LOCK2(cs_main, wallet->cs_wallet);
-        list = wallet->ListCoins(*m_locked_chain);
+        auto locked_chain = m_chain->lock();
+        LOCK(wallet->cs_wallet);
+        list = wallet->ListCoins(*locked_chain);
     }
     BOOST_CHECK_EQUAL(list.size(), 1U);
     BOOST_CHECK_EQUAL(boost::get<CKeyID>(list.begin()->first).ToString(), coinbaseAddress);
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index e6d5e21d89..03184d95ac 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -5019,7 +5019,7 @@ std::shared_ptr<CWallet> CWallet::CreateWalletFromFile(interfaces::Chain& chain,
             return error(_("Unable to generate initial keys"));
         }
 
-        auto locked_chain = chain.assumeLocked();  // Temporary. Removed in upcoming lock cleanup
+        auto locked_chain = chain.lock();
         walletInstance->ChainStateFlushed(locked_chain->getTipLocator());
 
         // Try to create wallet backup right after new wallet was created

From e51c4c41c0283a70f831518d0654f9006f79755a Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 22:34:46 +0530
Subject: [PATCH 13/17] merge bitcoin#16299: Move generated data to a dedicated
 translation unit

---
 src/Makefile.bench.include |  6 ++++--
 src/bench/checkblock.cpp   | 15 +++++----------
 src/bench/data.cpp         | 14 ++++++++++++++
 src/bench/data.h           | 19 +++++++++++++++++++
 4 files changed, 42 insertions(+), 12 deletions(-)
 create mode 100644 src/bench/data.cpp
 create mode 100644 src/bench/data.h

diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
index ffd97844ee..653da08f39 100644
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -21,6 +21,8 @@ bench_bench_dash_SOURCES = \
   bench/bls_dkg.cpp \
   bench/checkblock.cpp \
   bench/checkqueue.cpp \
+  bench/data.h \
+  bench/data.cpp \
   bench/duplicate_inputs.cpp \
   bench/ecdsa.cpp \
   bench/examples.cpp \
@@ -83,7 +85,7 @@ CLEAN_BITCOIN_BENCH = bench/*.gcda bench/*.gcno $(GENERATED_BENCH_FILES)
 
 CLEANFILES += $(CLEAN_BITCOIN_BENCH)
 
-bench/checkblock.cpp: bench/data/block813851.raw.h
+bench/data.cpp: bench/data/block813851.raw.h
 
 bitcoin_bench: $(BENCH_BINARY)
 
@@ -97,7 +99,7 @@ bench/data/%.raw.h: bench/data/%.raw
 	@$(MKDIR_P) $(@D)
 	@{ \
 	 echo "namespace raw_bench{" && \
-	 echo "static unsigned const char $(*F)[] = {" && \
+	 echo "static unsigned const char $(*F)_raw[] = {" && \
 	 $(HEXDUMP) -v -e '8/1 "0x%02x, "' -e '"\n"' $< | $(SED) -e 's/0x  ,//g' && \
 	 echo "};};"; \
 	} > "$@.new" && mv -f "$@.new" "$@"
diff --git a/src/bench/checkblock.cpp b/src/bench/checkblock.cpp
index f91ec7080b..0916fdd68f 100644
--- a/src/bench/checkblock.cpp
+++ b/src/bench/checkblock.cpp
@@ -3,39 +3,34 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <bench/bench.h>
+#include <bench/data.h>
 
 #include <chainparams.h>
 #include <validation.h>
 #include <streams.h>
 #include <consensus/validation.h>
 
-#include <bench/data/block813851.raw.h>
-
 // These are the two major time-sinks which happen after we have fully received
 // a block off the wire, but before we can relay the block on to peers using
 // compact block relay.
 
 static void DeserializeBlockTest(benchmark::Bench& bench)
 {
-    CDataStream stream((const char*)raw_bench::block813851,
-            (const char*)raw_bench::block813851+sizeof(raw_bench::block813851),
-            SER_NETWORK, PROTOCOL_VERSION);
+    CDataStream stream(benchmark::data::block813851, SER_NETWORK, PROTOCOL_VERSION);
     char a = '\0';
     stream.write(&a, 1); // Prevent compaction
 
     bench.unit("block").run([&] {
         CBlock block;
         stream >> block;
-        bool rewound = stream.Rewind(sizeof(raw_bench::block813851));
+        bool rewound = stream.Rewind(benchmark::data::block813851.size());
         assert(rewound);
     });
 }
 
 static void DeserializeAndCheckBlockTest(benchmark::Bench& bench)
 {
-    CDataStream stream((const char*)raw_bench::block813851,
-            (const char*)raw_bench::block813851+sizeof(raw_bench::block813851),
-            SER_NETWORK, PROTOCOL_VERSION);
+    CDataStream stream(benchmark::data::block813851, SER_NETWORK, PROTOCOL_VERSION);
     char a = '\0';
     stream.write(&a, 1); // Prevent compaction
 
@@ -44,7 +39,7 @@ static void DeserializeAndCheckBlockTest(benchmark::Bench& bench)
     bench.unit("block").run([&] {
         CBlock block; // Note that CBlock caches its checked state, so we need to recreate it here
         stream >> block;
-        bool rewound = stream.Rewind(sizeof(raw_bench::block813851));
+        bool rewound = stream.Rewind(benchmark::data::block813851.size());
         assert(rewound);
 
         CValidationState validationState;
diff --git a/src/bench/data.cpp b/src/bench/data.cpp
new file mode 100644
index 0000000000..16f1169fd2
--- /dev/null
+++ b/src/bench/data.cpp
@@ -0,0 +1,14 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <bench/data.h>
+
+namespace benchmark {
+namespace data {
+
+#include <bench/data/block813851.raw.h>
+const std::vector<uint8_t> block813851{raw_bench::block813851_raw, raw_bench::block813851_raw + sizeof(raw_bench::block813851_raw) / sizeof(raw_bench::block813851_raw[0])};
+
+} // namespace data
+} // namespace benchmark
diff --git a/src/bench/data.h b/src/bench/data.h
new file mode 100644
index 0000000000..bd99a3e53b
--- /dev/null
+++ b/src/bench/data.h
@@ -0,0 +1,19 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_BENCH_DATA_H
+#define BITCOIN_BENCH_DATA_H
+
+#include <cstdint>
+#include <vector>
+
+namespace benchmark {
+namespace data {
+
+extern const std::vector<uint8_t> block813851;
+
+} // namespace data
+} // namespace benchmark
+
+#endif // BITCOIN_BENCH_DATA_H

From 1e11a7ad03d4cb6370d38506b655b45c4bd5941e Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 14/17] merge bitcoin#16415: Get rid of PendingWalletTx class

Co-authored-by: PastaPastaPasta <PastaPastaPasta@users.noreply.github.com>
---
 src/interfaces/wallet.cpp         | 50 +++++++++++++------------------
 src/interfaces/wallet.h           | 24 +++++----------
 src/qt/sendcoinsdialog.cpp        |  4 +--
 src/qt/walletmodel.cpp            |  4 +--
 src/qt/walletmodeltransaction.cpp |  8 ++---
 src/qt/walletmodeltransaction.h   |  5 ++--
 6 files changed, 37 insertions(+), 58 deletions(-)

diff --git a/src/interfaces/wallet.cpp b/src/interfaces/wallet.cpp
index 4419cca9e8..9972711d44 100644
--- a/src/interfaces/wallet.cpp
+++ b/src/interfaces/wallet.cpp
@@ -42,32 +42,6 @@
 namespace interfaces {
 namespace {
 
-class PendingWalletTxImpl : public PendingWalletTx
-{
-public:
-    explicit PendingWalletTxImpl(CWallet& wallet) : m_wallet(wallet), m_key(&wallet) {}
-
-    const CTransaction& get() override { return *m_tx; }
-
-    bool commit(WalletValueMap value_map,
-        WalletOrderForm order_form,
-        std::string& reject_reason) override
-    {
-        auto locked_chain = m_wallet.chain().lock();
-        LOCK2(mempool.cs, m_wallet.cs_wallet);
-        CValidationState state;
-        if (!m_wallet.CommitTransaction(m_tx, std::move(value_map), std::move(order_form), m_key, state)) {
-            reject_reason = state.GetRejectReason();
-            return false;
-        }
-        return true;
-    }
-
-    CTransactionRef m_tx;
-    CWallet& m_wallet;
-    CReserveKey m_key;
-};
-
 //! Construct wallet tx struct.
 WalletTx MakeWalletTx(interfaces::Chain::Lock& locked_chain, CWallet& wallet, const CWalletTx& wtx)
 {
@@ -308,7 +282,7 @@ public:
         LOCK2(cs_main, m_wallet->cs_wallet);
         return m_wallet->ListProTxCoins(outputs);
     }
-    std::unique_ptr<PendingWalletTx> createTransaction(const std::vector<CRecipient>& recipients,
+    CTransactionRef createTransaction(const std::vector<CRecipient>& recipients,
         const CCoinControl& coin_control,
         bool sign,
         int& change_pos,
@@ -317,12 +291,28 @@ public:
     {
         auto locked_chain = m_wallet->chain().lock();
         LOCK2(mempool.cs, m_wallet->cs_wallet);
-        auto pending = MakeUnique<PendingWalletTxImpl>(*m_wallet);
-        if (!m_wallet->CreateTransaction(*locked_chain, recipients, pending->m_tx, pending->m_key, fee, change_pos,
+        CReserveKey m_key(m_wallet.get());
+        CTransactionRef tx;
+        if (!m_wallet->CreateTransaction(*locked_chain, recipients, tx, m_key, fee, change_pos,
                 fail_reason, coin_control, sign)) {
             return {};
         }
-        return std::move(pending);
+        return tx;
+    }
+    bool commitTransaction(CTransactionRef tx,
+        WalletValueMap value_map,
+        WalletOrderForm order_form,
+        std::string& reject_reason) override
+    {
+        auto locked_chain = m_wallet->chain().lock();
+        LOCK2(mempool.cs, m_wallet->cs_wallet);
+        CReserveKey m_key(m_wallet.get());
+        CValidationState state;
+        if (!m_wallet->CommitTransaction(std::move(tx), std::move(value_map), std::move(order_form), m_key, state)) {
+            reject_reason = state.GetRejectReason();
+            return false;
+        }
+        return true;
     }
     bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet->TransactionCanBeAbandoned(txid); }
     bool abandonTransaction(const uint256& txid) override
diff --git a/src/interfaces/wallet.h b/src/interfaces/wallet.h
index 4a538bf59a..da57c10b3b 100644
--- a/src/interfaces/wallet.h
+++ b/src/interfaces/wallet.h
@@ -32,7 +32,6 @@ struct CRecipient;
 namespace interfaces {
 
 class Handler;
-class PendingWalletTx;
 struct WalletAddress;
 struct WalletBalances;
 struct WalletTx;
@@ -159,13 +158,19 @@ public:
     virtual void listProTxCoins(std::vector<COutPoint>& vOutpts) = 0;
 
     //! Create transaction.
-    virtual std::unique_ptr<PendingWalletTx> createTransaction(const std::vector<CRecipient>& recipients,
+    virtual CTransactionRef createTransaction(const std::vector<CRecipient>& recipients,
         const CCoinControl& coin_control,
         bool sign,
         int& change_pos,
         CAmount& fee,
         std::string& fail_reason) = 0;
 
+    //! Commit transaction.
+    virtual bool commitTransaction(CTransactionRef tx,
+        WalletValueMap value_map,
+        WalletOrderForm order_form,
+        std::string& reject_reason) = 0;
+
     //! Return whether transaction can be abandoned.
     virtual bool transactionCanBeAbandoned(const uint256& txid) = 0;
 
@@ -313,21 +318,6 @@ public:
     virtual std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) = 0;
 };
 
-//! Tracking object returned by CreateTransaction and passed to CommitTransaction.
-class PendingWalletTx
-{
-public:
-    virtual ~PendingWalletTx() {}
-
-    //! Get transaction data.
-    virtual const CTransaction& get() = 0;
-
-    //! Send pending transaction and commit to wallet.
-    virtual bool commit(WalletValueMap value_map,
-        WalletOrderForm order_form,
-        std::string& reject_reason) = 0;
-};
-
 //! Information about one wallet address.
 struct WalletAddress
 {
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 2179d2f199..cca328eaad 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -411,7 +411,7 @@ void SendCoinsDialog::send(QList<SendCoinsRecipient> recipients)
     if (m_coin_control->IsUsingCoinJoin()) {
         // append number of inputs
         questionString.append("<hr />");
-        int nInputs = currentTransaction.getWtx()->get().vin.size();
+        int nInputs = currentTransaction.getWtx()->vin.size();
         questionString.append(tr("This transaction will consume %n input(s)", "", nInputs));
 
         // warn about potential privacy issues when spending too many inputs at once
@@ -464,7 +464,7 @@ void SendCoinsDialog::send(QList<SendCoinsRecipient> recipients)
         accept();
         m_coin_control->UnSelectAll();
         coinControlUpdateLabels();
-        Q_EMIT coinsSent(currentTransaction.getWtx()->get().GetHash());
+        Q_EMIT coinsSent(currentTransaction.getWtx()->GetHash());
     }
     fNewRecipientAllowed = true;
 }
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 556bdcb8c2..364b87918f 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -312,11 +312,11 @@ WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &tran
 
         auto& newTx = transaction.getWtx();
         std::string rejectReason;
-        if (!newTx->commit(std::move(mapValue), std::move(vOrderForm), rejectReason))
+        if (!wallet().commitTransaction(newTx, std::move(mapValue), std::move(vOrderForm), rejectReason))
             return SendCoinsReturn(TransactionCommitFailed, QString::fromStdString(rejectReason));
 
         CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
-        ssTx << newTx->get();
+        ssTx << *newTx;
         transaction_array.append(ssTx.data(), ssTx.size());
     }
 
diff --git a/src/qt/walletmodeltransaction.cpp b/src/qt/walletmodeltransaction.cpp
index 9e31cb4c2a..8bc3cc2463 100644
--- a/src/qt/walletmodeltransaction.cpp
+++ b/src/qt/walletmodeltransaction.cpp
@@ -22,14 +22,14 @@ QList<SendCoinsRecipient> WalletModelTransaction::getRecipients() const
     return recipients;
 }
 
-std::unique_ptr<interfaces::PendingWalletTx>& WalletModelTransaction::getWtx()
+CTransactionRef& WalletModelTransaction::getWtx()
 {
     return wtx;
 }
 
 unsigned int WalletModelTransaction::getTransactionSize()
 {
-    return wtx ? ::GetSerializeSize(wtx->get(), SER_NETWORK, PROTOCOL_VERSION) : 0;
+    return wtx != nullptr ? ::GetSerializeSize(*wtx, SER_NETWORK, PROTOCOL_VERSION) : 0;
 }
 
 CAmount WalletModelTransaction::getTransactionFee() const
@@ -60,7 +60,7 @@ void WalletModelTransaction::reassignAmounts()
                 if (out.amount() <= 0) continue;
                 const unsigned char* scriptStr = (const unsigned char*)out.script().data();
                 CScript scriptPubKey(scriptStr, scriptStr+out.script().size());
-                for (const auto& txout : wtx->get().vout) {
+                for (const auto& txout : wtx.get()->vout) {
                     if (txout.scriptPubKey == scriptPubKey) {
                         subtotal += txout.nValue;
                         break;
@@ -72,7 +72,7 @@ void WalletModelTransaction::reassignAmounts()
         else // normal recipient (no payment request)
 #endif
         {
-            for (const auto& txout : wtx->get().vout) {
+            for (const auto& txout : wtx.get()->vout) {
                 CScript scriptPubKey = GetScriptForDestination(DecodeDestination(rcp.address.toStdString()));
                 if (txout.scriptPubKey == scriptPubKey) {
                     rcp.amount = txout.nValue;
diff --git a/src/qt/walletmodeltransaction.h b/src/qt/walletmodeltransaction.h
index 2f01051cc3..6f3366cd08 100644
--- a/src/qt/walletmodeltransaction.h
+++ b/src/qt/walletmodeltransaction.h
@@ -16,7 +16,6 @@ class SendCoinsRecipient;
 
 namespace interfaces {
 class Node;
-class PendingWalletTx;
 }
 
 /** Data model for a walletmodel transaction. */
@@ -27,7 +26,7 @@ public:
 
     QList<SendCoinsRecipient> getRecipients() const;
 
-    std::unique_ptr<interfaces::PendingWalletTx>& getWtx();
+    CTransactionRef& getWtx();
     unsigned int getTransactionSize();
 
     void setTransactionFee(const CAmount& newFee);
@@ -39,7 +38,7 @@ public:
 
 private:
     QList<SendCoinsRecipient> recipients;
-    std::unique_ptr<interfaces::PendingWalletTx> wtx;
+    CTransactionRef wtx;
     CAmount fee;
 };
 

From f67199bbb0c9cc3f0c2a9e38fa317a41f08cd5eb Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 15/17] merge bitcoin#16468: Exclude depends/Makefile in
 .gitignore

---
 .gitignore | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.gitignore b/.gitignore
index 57c426256b..3971f68da9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -91,6 +91,7 @@ libconftest.dylib*
 # Compilation and Qt preprocessor part
 *.qm
 Makefile
+!depends/Makefile
 dash-qt
 Dash-Qt.app
 background.tiff*

From 1f61b27399c815ea89ebc7b379283921815a800c Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 16/17] merge bitcoin#16475: Enumerate walletdb keys

---
 src/wallet/wallet.cpp   |   6 --
 src/wallet/wallet.h     |  18 ++--
 src/wallet/walletdb.cpp | 220 ++++++++++++++++++++--------------------
 src/wallet/walletdb.h   |  30 ++++++
 4 files changed, 145 insertions(+), 129 deletions(-)

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 03184d95ac..c6c0081b08 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -5481,12 +5481,6 @@ CKeyPool::CKeyPool(const CPubKey& vchPubKeyIn, bool fInternalIn)
     fInternal = fInternalIn;
 }
 
-CWalletKey::CWalletKey(int64_t nExpires)
-{
-    nTimeCreated = (nExpires ? GetTime() : 0);
-    nTimeExpires = nExpires;
-}
-
 void CMerkleTx::SetMerkleBranch(const uint256& block_hash, int posInBlock)
 {
     // Update the tx's hashBlock
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index cbb4669e62..4b73666a1b 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -601,21 +601,17 @@ public:
     }
 };
 
-/** Private key that includes an expiration date in case it never gets used. */
-class CWalletKey
-{
-public:
+/** Private key that was serialized by an old wallet (only used for deserialization) */
+struct OldKey {
     CPrivKey vchPrivKey;
-    int64_t nTimeCreated;
-    int64_t nTimeExpires;
-    std::string strComment;
-    // todo: add something to note what created it (user, getnewaddress, change)
-    //   maybe should have a map<string, string> property map
-
-    explicit CWalletKey(int64_t nExpires=0);
 
     SERIALIZE_METHODS(CWalletKey, obj)
     {
+        // no longer used by the wallet, thus dropped after deserialization:
+        int64_t nTimeCreated;
+        int64_t nTimeExpires;
+        std::string strComment;
+
         int nVersion = s.GetVersion();
         if (!(s.GetType() & SER_GETHASH))
             READWRITE(nVersion);
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 913ff883d0..0f4c06b099 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -22,50 +22,80 @@
 #include <atomic>
 #include <string>
 
+namespace DBKeys {
+const std::string ACENTRY{"acentry"};
+const std::string BESTBLOCK_NOMERKLE{"bestblock_nomerkle"};
+const std::string BESTBLOCK{"bestblock"};
+const std::string CRYPTED_KEY{"ckey"};
+const std::string CRYPTED_HDCHAIN{"chdchain"};
+const std::string COINJOIN_SALT{"cj_salt"};
+const std::string CSCRIPT{"cscript"};
+const std::string DEFAULTKEY{"defaultkey"};
+const std::string DESTDATA{"destdata"};
+const std::string FLAGS{"flags"};
+const std::string G_OBJECT{"g_object"};
+const std::string HDCHAIN{"hdchain"};
+const std::string HDPUBKEY{"hdpubkey"};
+const std::string KEYMETA{"keymeta"};
+const std::string KEY{"key"};
+const std::string MASTER_KEY{"mkey"};
+const std::string MINVERSION{"minversion"};
+const std::string NAME{"name"};
+const std::string OLD_KEY{"wkey"};
+const std::string ORDERPOSNEXT{"orderposnext"};
+const std::string POOL{"pool"};
+const std::string PURPOSE{"purpose"};
+const std::string PRIVATESEND_SALT{"ps_salt"};
+const std::string TX{"tx"};
+const std::string VERSION{"version"};
+const std::string WATCHMETA{"watchmeta"};
+const std::string WATCHS{"watchs"};
+} // namespace DBKeys
+
 //
 // WalletBatch
 //
 
 bool WalletBatch::WriteName(const std::string& strAddress, const std::string& strName)
 {
-    return WriteIC(std::make_pair(std::string("name"), strAddress), strName);
+    return WriteIC(std::make_pair(DBKeys::NAME, strAddress), strName);
 }
 
 bool WalletBatch::EraseName(const std::string& strAddress)
 {
     // This should only be used for sending addresses, never for receiving addresses,
     // receiving addresses must always have an address book entry if they're not change return.
-    return EraseIC(std::make_pair(std::string("name"), strAddress));
+    return EraseIC(std::make_pair(DBKeys::NAME, strAddress));
 }
 
 bool WalletBatch::WritePurpose(const std::string& strAddress, const std::string& strPurpose)
 {
-    return WriteIC(std::make_pair(std::string("purpose"), strAddress), strPurpose);
+    return WriteIC(std::make_pair(DBKeys::PURPOSE, strAddress), strPurpose);
 }
 
 bool WalletBatch::ErasePurpose(const std::string& strAddress)
 {
-    return EraseIC(std::make_pair(std::string("purpose"), strAddress));
+    return EraseIC(std::make_pair(DBKeys::PURPOSE, strAddress));
 }
 
 bool WalletBatch::WriteTx(const CWalletTx& wtx)
 {
-    return WriteIC(std::make_pair(std::string("tx"), wtx.GetHash()), wtx);
+    return WriteIC(std::make_pair(DBKeys::TX, wtx.GetHash()), wtx);
 }
 
 bool WalletBatch::EraseTx(uint256 hash)
 {
-    return EraseIC(std::make_pair(std::string("tx"), hash));
+    return EraseIC(std::make_pair(DBKeys::TX, hash));
 }
 
 bool WalletBatch::WriteKeyMeta(const CPubKey& vchPubKey, const CKeyMetadata& keyMeta)
 {
-    return WriteIC(std::make_pair(std::string("keymeta"), vchPubKey), keyMeta, true);
+    return WriteIC(std::make_pair(DBKeys::KEYMETA, vchPubKey), keyMeta, true);
 }
 
 bool WalletBatch::WriteKey(const CPubKey& vchPubKey, const CPrivKey& vchPrivKey, const CKeyMetadata& keyMeta)
 {
-    if (!WriteIC(std::make_pair(std::string("keymeta"), vchPubKey), keyMeta, false)) {
+    if (!WriteIC(std::make_pair(DBKeys::KEYMETA, vchPubKey), keyMeta, false)) {
         return false;
     }
 
@@ -75,102 +105,102 @@ bool WalletBatch::WriteKey(const CPubKey& vchPubKey, const CPrivKey& vchPrivKey,
     vchKey.insert(vchKey.end(), vchPubKey.begin(), vchPubKey.end());
     vchKey.insert(vchKey.end(), vchPrivKey.begin(), vchPrivKey.end());
 
-    return WriteIC(std::make_pair(std::string("key"), vchPubKey), std::make_pair(vchPrivKey, Hash(vchKey.begin(), vchKey.end())), false);
+    return WriteIC(std::make_pair(DBKeys::KEY, vchPubKey), std::make_pair(vchPrivKey, Hash(vchKey.begin(), vchKey.end())), false);
 }
 
 bool WalletBatch::WriteCryptedKey(const CPubKey& vchPubKey,
                                 const std::vector<unsigned char>& vchCryptedSecret,
                                 const CKeyMetadata &keyMeta)
 {
-    if (!WriteIC(std::make_pair(std::string("keymeta"), vchPubKey), keyMeta)) {
+    if (!WriteIC(std::make_pair(DBKeys::KEYMETA, vchPubKey), keyMeta)) {
         return false;
     }
 
-    if (!WriteIC(std::make_pair(std::string("ckey"), vchPubKey), vchCryptedSecret, false)) {
+    if (!WriteIC(std::make_pair(DBKeys::CRYPTED_KEY, vchPubKey), vchCryptedSecret, false)) {
         return false;
     }
-    EraseIC(std::make_pair(std::string("key"), vchPubKey));
-    EraseIC(std::make_pair(std::string("wkey"), vchPubKey));
+    EraseIC(std::make_pair(DBKeys::KEY, vchPubKey));
+    EraseIC(std::make_pair(DBKeys::OLD_KEY, vchPubKey));
     return true;
 }
 
 bool WalletBatch::WriteMasterKey(unsigned int nID, const CMasterKey& kMasterKey)
 {
-    return WriteIC(std::make_pair(std::string("mkey"), nID), kMasterKey, true);
+    return WriteIC(std::make_pair(DBKeys::MASTER_KEY, nID), kMasterKey, true);
 }
 
 bool WalletBatch::WriteCScript(const uint160& hash, const CScript& redeemScript)
 {
-    return WriteIC(std::make_pair(std::string("cscript"), hash), redeemScript, false);
+    return WriteIC(std::make_pair(DBKeys::CSCRIPT, hash), redeemScript, false);
 }
 
 bool WalletBatch::WriteWatchOnly(const CScript &dest, const CKeyMetadata& keyMeta)
 {
-    if (!WriteIC(std::make_pair(std::string("watchmeta"), dest), keyMeta)) {
+    if (!WriteIC(std::make_pair(DBKeys::WATCHMETA, dest), keyMeta)) {
         return false;
     }
-    return WriteIC(std::make_pair(std::string("watchs"), dest), '1');
+    return WriteIC(std::make_pair(DBKeys::WATCHS, dest), '1');
 }
 
 bool WalletBatch::EraseWatchOnly(const CScript &dest)
 {
-    if (!EraseIC(std::make_pair(std::string("watchmeta"), dest))) {
+    if (!EraseIC(std::make_pair(DBKeys::WATCHMETA, dest))) {
         return false;
     }
-    return EraseIC(std::make_pair(std::string("watchs"), dest));
+    return EraseIC(std::make_pair(DBKeys::WATCHS, dest));
 }
 
 bool WalletBatch::WriteBestBlock(const CBlockLocator& locator)
 {
-    WriteIC(std::string("bestblock"), CBlockLocator()); // Write empty block locator so versions that require a merkle branch automatically rescan
-    return WriteIC(std::string("bestblock_nomerkle"), locator);
+    WriteIC(DBKeys::BESTBLOCK, CBlockLocator()); // Write empty block locator so versions that require a merkle branch automatically rescan
+    return WriteIC(DBKeys::BESTBLOCK_NOMERKLE, locator);
 }
 
 bool WalletBatch::ReadBestBlock(CBlockLocator& locator)
 {
-    if (m_batch.Read(std::string("bestblock"), locator) && !locator.vHave.empty()) return true;
-    return m_batch.Read(std::string("bestblock_nomerkle"), locator);
+    if (m_batch.Read(DBKeys::BESTBLOCK, locator) && !locator.vHave.empty()) return true;
+    return m_batch.Read(DBKeys::BESTBLOCK_NOMERKLE, locator);
 }
 
 bool WalletBatch::WriteOrderPosNext(int64_t nOrderPosNext)
 {
-    return WriteIC(std::string("orderposnext"), nOrderPosNext);
+    return WriteIC(DBKeys::ORDERPOSNEXT, nOrderPosNext);
 }
 
 bool WalletBatch::ReadPool(int64_t nPool, CKeyPool& keypool)
 {
-    return m_batch.Read(std::make_pair(std::string("pool"), nPool), keypool);
+    return m_batch.Read(std::make_pair(DBKeys::POOL, nPool), keypool);
 }
 
 bool WalletBatch::WritePool(int64_t nPool, const CKeyPool& keypool)
 {
-    return WriteIC(std::make_pair(std::string("pool"), nPool), keypool);
+    return WriteIC(std::make_pair(DBKeys::POOL, nPool), keypool);
 }
 
 bool WalletBatch::ErasePool(int64_t nPool)
 {
-    return EraseIC(std::make_pair(std::string("pool"), nPool));
+    return EraseIC(std::make_pair(DBKeys::POOL, nPool));
 }
 
 bool WalletBatch::WriteMinVersion(int nVersion)
 {
-    return WriteIC(std::string("minversion"), nVersion);
+    return WriteIC(DBKeys::MINVERSION, nVersion);
 }
 
 bool WalletBatch::ReadCoinJoinSalt(uint256& salt, bool fLegacy)
 {
     // TODO: Remove legacy checks after few major releases
-    return m_batch.Read(std::string(fLegacy ? "ps_salt" : "cj_salt"), salt);
+    return m_batch.Read(std::string(fLegacy ? DBKeys::PRIVATESEND_SALT : DBKeys::COINJOIN_SALT), salt);
 }
 
 bool WalletBatch::WriteCoinJoinSalt(const uint256& salt)
 {
-    return WriteIC(std::string("cj_salt"), salt);
+    return WriteIC(DBKeys::COINJOIN_SALT, salt);
 }
 
 bool WalletBatch::WriteGovernanceObject(const CGovernanceObject& obj)
 {
-    return WriteIC(std::make_pair(std::string("gobject"), obj.GetHash()), obj, false);
+    return WriteIC(std::make_pair(DBKeys::G_OBJECT, obj.GetHash()), obj, false);
 }
 
 
@@ -199,20 +229,15 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
         // Taking advantage of the fact that pair serialization
         // is just the two items serialized one after the other
         ssKey >> strType;
-        if (strType == "name")
-        {
+        if (strType == DBKeys::NAME) {
             std::string strAddress;
             ssKey >> strAddress;
             ssValue >> pwallet->mapAddressBook[DecodeDestination(strAddress)].name;
-        }
-        else if (strType == "purpose")
-        {
+        } else if (strType == DBKeys::PURPOSE) {
             std::string strAddress;
             ssKey >> strAddress;
             ssValue >> pwallet->mapAddressBook[DecodeDestination(strAddress)].purpose;
-        }
-        else if (strType == "tx")
-        {
+        } else if (strType == DBKeys::TX) {
             uint256 hash;
             ssKey >> hash;
             CWalletTx wtx(nullptr /* pwallet */, MakeTransactionRef());
@@ -246,9 +271,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 wss.fAnyUnordered = true;
 
             pwallet->LoadToWallet(wtx);
-        }
-        else if (strType == "watchs")
-        {
+        } else if (strType == DBKeys::WATCHS) {
             wss.nWatchKeys++;
             CScript script;
             ssKey >> script;
@@ -256,9 +279,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             ssValue >> fYes;
             if (fYes == '1')
                 pwallet->LoadWatchOnly(script);
-        }
-        else if (strType == "key" || strType == "wkey")
-        {
+        } else if (strType == DBKeys::KEY || strType == DBKeys::OLD_KEY) {
             CPubKey vchPubKey;
             ssKey >> vchPubKey;
             if (!vchPubKey.IsValid())
@@ -270,20 +291,19 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             CPrivKey pkey;
             uint256 hash;
 
-            if (strType == "key")
-            {
+            if (strType == DBKeys::KEY) {
                 wss.nKeys++;
                 ssValue >> pkey;
             } else {
-                CWalletKey wkey;
+                OldKey wkey;
                 ssValue >> wkey;
                 pkey = wkey.vchPrivKey;
             }
 
-            // Old wallets store keys as "key" [pubkey] => [privkey]
+            // Old wallets store keys as DBKeys::KEY [pubkey] => [privkey]
             // ... which was slow for wallets with lots of keys, because the public key is re-derived from the private key
             // using EC operations as a checksum.
-            // Newer wallets store keys as "key"[pubkey] => [privkey][hash(pubkey,privkey)], which is much faster while
+            // Newer wallets store keys as DBKeys::KEY [pubkey] => [privkey][hash(pubkey,privkey)], which is much faster while
             // remaining backwards-compatible.
             try
             {
@@ -320,9 +340,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: LoadKey failed";
                 return false;
             }
-        }
-        else if (strType == "mkey")
-        {
+        } else if (strType == DBKeys::MASTER_KEY) {
             unsigned int nID;
             ssKey >> nID;
             CMasterKey kMasterKey;
@@ -335,9 +353,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             pwallet->mapMasterKeys[nID] = kMasterKey;
             if (pwallet->nMasterKeyMaxID < nID)
                 pwallet->nMasterKeyMaxID = nID;
-        }
-        else if (strType == "ckey")
-        {
+        } else if (strType == DBKeys::CRYPTED_KEY) {
             CPubKey vchPubKey;
             ssKey >> vchPubKey;
             if (!vchPubKey.IsValid())
@@ -355,27 +371,21 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 return false;
             }
             wss.fIsEncrypted = true;
-        }
-        else if (strType == "keymeta")
-        {
+        } else if (strType == DBKeys::KEYMETA) {
             CPubKey vchPubKey;
             ssKey >> vchPubKey;
             CKeyMetadata keyMeta;
             ssValue >> keyMeta;
             wss.nKeyMeta++;
             pwallet->LoadKeyMetadata(vchPubKey.GetID(), keyMeta);
-        }
-        else if (strType == "watchmeta")
-        {
+        } else if (strType == DBKeys::WATCHMETA) {
             CScript script;
             ssKey >> script;
             CKeyMetadata keyMeta;
             ssValue >> keyMeta;
             wss.nKeyMeta++;
             pwallet->LoadScriptMetadata(CScriptID(script), keyMeta);
-        }
-        else if (strType == "defaultkey")
-        {
+        } else if (strType == DBKeys::DEFAULTKEY) {
             // We don't want or need the default key, but if there is one set,
             // we want to make sure that it is valid so that we can detect corruption
             CPubKey vchPubKey;
@@ -384,17 +394,13 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: Default Key corrupt";
                 return false;
             }
-        }
-        else if (strType == "pool")
-        {
+        } else if (strType == DBKeys::POOL) {
             int64_t nIndex;
             ssKey >> nIndex;
             CKeyPool keypool;
             ssValue >> keypool;
             pwallet->LoadKeyPool(nIndex, keypool);
-        }
-        else if (strType == "cscript")
-        {
+        } else if (strType == DBKeys::CSCRIPT) {
             uint160 hash;
             ssKey >> hash;
             CScript script;
@@ -404,21 +410,15 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: LoadCScript failed";
                 return false;
             }
-        }
-        else if (strType == "orderposnext")
-        {
+        } else if (strType == DBKeys::ORDERPOSNEXT) {
             ssValue >> pwallet->nOrderPosNext;
-        }
-        else if (strType == "destdata")
-        {
+        } else if (strType == DBKeys::DESTDATA) {
             std::string strAddress, strKey, strValue;
             ssKey >> strAddress;
             ssKey >> strKey;
             ssValue >> strValue;
             pwallet->LoadDestData(DecodeDestination(strAddress), strKey, strValue);
-        }
-        else if (strType == "hdchain")
-        {
+        } else if (strType == DBKeys::HDCHAIN) {
             CHDChain chain;
             ssValue >> chain;
             if (!pwallet->SetHDChainSingle(chain, true))
@@ -426,9 +426,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: SetHDChain failed";
                 return false;
             }
-        }
-        else if (strType == "chdchain")
-        {
+        } else if (strType == DBKeys::CRYPTED_HDCHAIN) {
             CHDChain chain;
             ssValue >> chain;
             if (!pwallet->SetCryptedHDChainSingle(chain, true))
@@ -436,9 +434,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: SetHDCryptedChain failed";
                 return false;
             }
-        }
-        else if (strType == "hdpubkey")
-        {
+        } else if (strType == DBKeys::HDPUBKEY) {
             wss.nHDPubKeys++;
             CPubKey vchPubKey;
             ssKey >> vchPubKey;
@@ -456,7 +452,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: LoadHDPubKey failed";
                 return false;
             }
-        } else if (strType == "gobject") {
+        } else if (strType == DBKeys::G_OBJECT) {
             uint256 nObjectHash;
             CGovernanceObject obj;
             ssKey >> nObjectHash;
@@ -471,15 +467,15 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Invalid governance object: LoadGovernanceObject";
                 return false;
             }
-        } else if (strType == "flags") {
+        } else if (strType == DBKeys::FLAGS) {
             uint64_t flags;
             ssValue >> flags;
             if (!pwallet->SetWalletFlags(flags, true)) {
                 strErr = "Error reading wallet database: Unknown non-tolerable wallet flags found";
                 return false;
             }
-        } else if (strType != "bestblock" && strType != "bestblock_nomerkle" &&
-                strType != "minversion" && strType != "acentry" && strType != "version") {
+        } else if (strType != DBKeys::BESTBLOCK && strType != DBKeys::BESTBLOCK_NOMERKLE &&
+                   strType != DBKeys::MINVERSION && strType != DBKeys::ACENTRY && strType != DBKeys::VERSION) {
             wss.m_unknown_records++;
         }
     } catch (const std::exception& e) {
@@ -498,9 +494,9 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
 
 bool WalletBatch::IsKeyType(const std::string& strType)
 {
-    return (strType== "key" || strType == "wkey" ||
-            strType == "mkey" || strType == "ckey" ||
-            strType == "hdchain" || strType == "chdchain");
+    return (strType == DBKeys::KEY || strType == DBKeys::OLD_KEY ||
+            strType == DBKeys::MASTER_KEY || strType == DBKeys::CRYPTED_KEY ||
+            strType == DBKeys::HDCHAIN || strType == DBKeys::CRYPTED_HDCHAIN);
 }
 
 DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
@@ -514,8 +510,7 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
     LOCK(pwallet->cs_wallet);
     try {
         int nMinVersion = 0;
-        if (m_batch.Read((std::string)"minversion", nMinVersion))
-        {
+        if (m_batch.Read(DBKeys::MINVERSION, nMinVersion)) {
             if (nMinVersion > FEATURE_LATEST)
                 return DBErrors::TOO_NEW;
             pwallet->LoadMinVersion(nMinVersion);
@@ -549,15 +544,15 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
             {
                 // losing keys is considered a catastrophic error, anything else
                 // we assume the user can live with:
-                if (IsKeyType(strType) || strType == "defaultkey") {
+                if (IsKeyType(strType) || strType == DBKeys::DEFAULTKEY) {
                     result = DBErrors::CORRUPT;
-                } else if(strType == "flags") {
+                } else if (strType == DBKeys::FLAGS) {
                     // reading the wallet flags can only fail if unknown flags are present
                     result = DBErrors::TOO_NEW;
                 } else {
                     // Leave other errors alone, if we try to fix them we might make things worse.
                     fNoncriticalErrors = true; // ... but do warn the user there is something wrong.
-                    if (strType == "tx")
+                    if (strType == DBKeys::TX)
                         // Rescan if there is a bad transaction record:
                         gArgs.SoftSetBoolArg("-rescan", true);
                 }
@@ -584,7 +579,7 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
 
     // Last client version to open this wallet, was previously the file version number
     int last_client = CLIENT_VERSION;
-    m_batch.Read(std::string("version"), last_client);
+    m_batch.Read(DBKeys::VERSION, last_client);
 
     int wallet_version = pwallet->GetVersion();
     pwallet->WalletLogPrintf("Wallet File Version = %d\n", wallet_version > 0 ? wallet_version : last_client);
@@ -605,7 +600,7 @@ DBErrors WalletBatch::LoadWallet(CWallet* pwallet)
         return DBErrors::NEED_REWRITE;
 
     if (last_client < CLIENT_VERSION) // Update
-        m_batch.Write(std::string("version"), CLIENT_VERSION);
+        m_batch.Write(DBKeys::VERSION, CLIENT_VERSION);
 
     if (wss.fAnyUnordered)
         result = pwallet->ReorderTransactions();
@@ -619,8 +614,7 @@ DBErrors WalletBatch::FindWalletTx(std::vector<uint256>& vTxHash, std::vector<CW
 
     try {
         int nMinVersion = 0;
-        if (m_batch.Read((std::string)"minversion", nMinVersion))
-        {
+        if (m_batch.Read(DBKeys::MINVERSION, nMinVersion)) {
             if (nMinVersion > FEATURE_LATEST)
                 return DBErrors::TOO_NEW;
         }
@@ -649,7 +643,7 @@ DBErrors WalletBatch::FindWalletTx(std::vector<uint256>& vTxHash, std::vector<CW
 
             std::string strType;
             ssKey >> strType;
-            if (strType == "tx") {
+            if (strType == DBKeys::TX) {
                 uint256 hash;
                 ssKey >> hash;
 
@@ -780,8 +774,10 @@ bool WalletBatch::RecoverKeysOnlyFilter(void *callbackData, CDataStream ssKey, C
         fReadOK = ReadKeyValue(dummyWallet, ssKey, ssValue,
                                dummyWss, strType, strErr);
     }
-    if (!IsKeyType(strType) && strType != "hdpubkey")
+    if (!IsKeyType(strType) && strType != DBKeys::HDCHAIN) {
         return false;
+    }
+
     if (!fReadOK)
     {
         LogPrintf("WARNING: WalletBatch::Recover skipping %s: %s\n", strType, strErr);
@@ -803,40 +799,40 @@ bool WalletBatch::VerifyDatabaseFile(const fs::path& wallet_path, std::string& w
 
 bool WalletBatch::WriteDestData(const std::string &address, const std::string &key, const std::string &value)
 {
-    return WriteIC(std::make_pair(std::string("destdata"), std::make_pair(address, key)), value);
+    return WriteIC(std::make_pair(DBKeys::DESTDATA, std::make_pair(address, key)), value);
 }
 
 bool WalletBatch::EraseDestData(const std::string &address, const std::string &key)
 {
-    return EraseIC(std::make_pair(std::string("destdata"), std::make_pair(address, key)));
+    return EraseIC(std::make_pair(DBKeys::DESTDATA, std::make_pair(address, key)));
 }
 
 bool WalletBatch::WriteHDChain(const CHDChain& chain)
 {
-    return WriteIC(std::string("hdchain"), chain);
+    return WriteIC(DBKeys::HDCHAIN, chain);
 }
 
 bool WalletBatch::WriteCryptedHDChain(const CHDChain& chain)
 {
-    if (!WriteIC(std::string("chdchain"), chain))
+    if (!WriteIC(DBKeys::CRYPTED_HDCHAIN, chain))
         return false;
 
-    EraseIC(std::string("hdchain"));
+    EraseIC(DBKeys::HDCHAIN);
 
     return true;
 }
 
 bool WalletBatch::WriteHDPubKey(const CHDPubKey& hdPubKey, const CKeyMetadata& keyMeta)
 {
-    if (!WriteIC(std::make_pair(std::string("keymeta"), hdPubKey.extPubKey.pubkey), keyMeta, false))
+    if (!WriteIC(std::make_pair(DBKeys::KEYMETA, hdPubKey.extPubKey.pubkey), keyMeta, false))
         return false;
 
-    return WriteIC(std::make_pair(std::string("hdpubkey"), hdPubKey.extPubKey.pubkey), hdPubKey, false);
+    return WriteIC(std::make_pair(DBKeys::HDPUBKEY, hdPubKey.extPubKey.pubkey), hdPubKey, false);
 }
 
 bool WalletBatch::WriteWalletFlags(const uint64_t flags)
 {
-    return WriteIC(std::string("flags"), flags);
+    return WriteIC(DBKeys::FLAGS, flags);
 }
 
 bool WalletBatch::TxnBegin()
diff --git a/src/wallet/walletdb.h b/src/wallet/walletdb.h
index 2fd35afee8..bc93d70e60 100644
--- a/src/wallet/walletdb.h
+++ b/src/wallet/walletdb.h
@@ -55,6 +55,36 @@ enum class DBErrors
     NEED_REWRITE
 };
 
+namespace DBKeys {
+extern const std::string ACENTRY;
+extern const std::string BESTBLOCK;
+extern const std::string BESTBLOCK_NOMERKLE;
+extern const std::string CRYPTED_HDCHAIN;
+extern const std::string CRYPTED_KEY;
+extern const std::string COINJOIN_SALT;
+extern const std::string CSCRIPT;
+extern const std::string DEFAULTKEY;
+extern const std::string DESTDATA;
+extern const std::string FLAGS;
+extern const std::string G_OBJECT;
+extern const std::string HDCHAIN;
+extern const std::string HDPUBKEY;
+extern const std::string KEY;
+extern const std::string KEYMETA;
+extern const std::string MASTER_KEY;
+extern const std::string MINVERSION;
+extern const std::string NAME;
+extern const std::string OLD_KEY;
+extern const std::string ORDERPOSNEXT;
+extern const std::string POOL;
+extern const std::string PURPOSE;
+extern const std::string PRIVATESEND_SALT;
+extern const std::string TX;
+extern const std::string VERSION;
+extern const std::string WATCHMETA;
+extern const std::string WATCHS;
+} // namespace DBKeys
+
 class CKeyMetadata
 {
 public:

From f2af35c92e6c9baac399e81cb88ae8dc6d457c4d Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kittywhiskers@users.noreply.github.com>
Date: Sun, 12 Dec 2021 19:08:12 +0530
Subject: [PATCH 17/17] merge bitcoin#16502: Drop unused OldKey

---
 src/wallet/wallet.h     | 18 ------------------
 src/wallet/walletdb.cpp | 18 +++++++-----------
 2 files changed, 7 insertions(+), 29 deletions(-)

diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 4b73666a1b..c92733691e 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -601,24 +601,6 @@ public:
     }
 };
 
-/** Private key that was serialized by an old wallet (only used for deserialization) */
-struct OldKey {
-    CPrivKey vchPrivKey;
-
-    SERIALIZE_METHODS(CWalletKey, obj)
-    {
-        // no longer used by the wallet, thus dropped after deserialization:
-        int64_t nTimeCreated;
-        int64_t nTimeExpires;
-        std::string strComment;
-
-        int nVersion = s.GetVersion();
-        if (!(s.GetType() & SER_GETHASH))
-            READWRITE(nVersion);
-        READWRITE(obj.vchPrivKey, obj.nTimeCreated, obj.nTimeExpires, LIMITED_STRING(obj.strComment, 65536));
-    }
-};
-
 struct CoinSelectionParams
 {
     bool use_bnb = true;
diff --git a/src/wallet/walletdb.cpp b/src/wallet/walletdb.cpp
index 0f4c06b099..d8ceaaf602 100644
--- a/src/wallet/walletdb.cpp
+++ b/src/wallet/walletdb.cpp
@@ -120,7 +120,6 @@ bool WalletBatch::WriteCryptedKey(const CPubKey& vchPubKey,
         return false;
     }
     EraseIC(std::make_pair(DBKeys::KEY, vchPubKey));
-    EraseIC(std::make_pair(DBKeys::OLD_KEY, vchPubKey));
     return true;
 }
 
@@ -279,7 +278,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             ssValue >> fYes;
             if (fYes == '1')
                 pwallet->LoadWatchOnly(script);
-        } else if (strType == DBKeys::KEY || strType == DBKeys::OLD_KEY) {
+        } else if (strType == DBKeys::KEY) {
             CPubKey vchPubKey;
             ssKey >> vchPubKey;
             if (!vchPubKey.IsValid())
@@ -291,14 +290,8 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
             CPrivKey pkey;
             uint256 hash;
 
-            if (strType == DBKeys::KEY) {
-                wss.nKeys++;
-                ssValue >> pkey;
-            } else {
-                OldKey wkey;
-                ssValue >> wkey;
-                pkey = wkey.vchPrivKey;
-            }
+            wss.nKeys++;
+            ssValue >> pkey;
 
             // Old wallets store keys as DBKeys::KEY [pubkey] => [privkey]
             // ... which was slow for wallets with lots of keys, because the public key is re-derived from the private key
@@ -474,6 +467,9 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                 strErr = "Error reading wallet database: Unknown non-tolerable wallet flags found";
                 return false;
             }
+        } else if (strType == DBKeys::OLD_KEY) {
+            strErr = "Found unsupported 'wkey' record, try loading with version 0.17";
+            return false;
         } else if (strType != DBKeys::BESTBLOCK && strType != DBKeys::BESTBLOCK_NOMERKLE &&
                    strType != DBKeys::MINVERSION && strType != DBKeys::ACENTRY && strType != DBKeys::VERSION) {
             wss.m_unknown_records++;
@@ -494,7 +490,7 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
 
 bool WalletBatch::IsKeyType(const std::string& strType)
 {
-    return (strType == DBKeys::KEY || strType == DBKeys::OLD_KEY ||
+    return (strType == DBKeys::KEY ||
             strType == DBKeys::MASTER_KEY || strType == DBKeys::CRYPTED_KEY ||
             strType == DBKeys::HDCHAIN || strType == DBKeys::CRYPTED_HDCHAIN);
 }