Merge #21390: test: Test improvements for UTXO set hash tests

4f2653a89018fa4d24bd2a551832a7410b682600 test: Use deterministic chain in utxo set hash test (Fabian Jahr)
4973c5175c5fd1f4791ea26e8ddefd6fb11ac1c3 test: Remove wallet dependency of utxo set hash test (Fabian Jahr)
1a27af1d7b5ec18b4248ead1eaf0f381047b4b24 rpc: Improve gettxoutsetinfo help (Fabian Jahr)

Pull request description:

  Follow-ups to #19145:
  - Small improvement on the help text of RPC gettxoutsetinfo
  - Using deterministic blockchain in the test `functional/feature_utxo_set_hash.py`
  - Removing wallet dependency in the test `functional/feature_utxo_set_hash.py`

  Split out of #19521.

ACKs for top commit:
  MarcoFalke:
    review ACK 4f2653a89018fa4d24bd2a551832a7410b682600 👲

Tree-SHA512: 92927b3aa22b6324eb4fc9d346755313dec44d973aa69a0ebf80a8569b5f3a7cf3539721ebdba183737534b9e29b3e33f412515890f0d0b819878032a3bba8f9

src/node/coinstats.cpp

@@ -18,6 +18,7 @@
 
 #include <map>
 
+// Database-independent metric indicating the UTXO set size
 uint64_t GetBogoSize(const CScript& script_pub_key)
 {
     return 32 /* txid */ +

src/rpc/blockchain.cpp

@@ -1360,15 +1360,15 @@ static RPCHelpMan gettxoutsetinfo()
         RPCResult{
             RPCResult::Type::OBJ, "", "",
             {
-                {RPCResult::Type::NUM, "height", "The current block height (index)"},
-                {RPCResult::Type::STR_HEX, "bestblock", "The hash of the block at the tip of the chain"},
+                {RPCResult::Type::NUM, "height", "The block height (index) of the returned statistics"},
+                {RPCResult::Type::STR_HEX, "bestblock", "The hash of the block at which these statistics are calculated"},
                 {RPCResult::Type::NUM, "txouts", "The number of unspent transaction outputs"},
                 {RPCResult::Type::NUM, "bogosize", "Database-independent, meaningless metric indicating the UTXO set size"},
                 {RPCResult::Type::STR_HEX, "hash_serialized_2", /* optional */ true, "The serialized hash (only present if 'hash_serialized_2' hash_type is chosen)"},
                 {RPCResult::Type::STR_HEX, "muhash", /* optional */ true, "The serialized hash (only present if 'muhash' hash_type is chosen)"},
                 {RPCResult::Type::NUM, "transactions", "The number of transactions with unspent outputs (not available when coinstatsindex is used)"},
                 {RPCResult::Type::NUM, "disk_size", "The estimated size of the chainstate on disk (not available when coinstatsindex is used)"},
-                {RPCResult::Type::STR_AMOUNT, "total_amount", "The total amount"},
+                {RPCResult::Type::STR_AMOUNT, "total_amount", "The total amount of coins in the UTXO set"},
                 {RPCResult::Type::STR_AMOUNT, "total_unspendable_amount", "The total amount of coins permanently excluded from the UTXO set (only available if coinstatsindex is used)"},
                 {RPCResult::Type::OBJ, "block_info", "Info on amounts in the block at this block height (only available if coinstatsindex is used)",
                 {

test/functional/feature_utxo_set_hash.py

@@ -6,7 +6,6 @@
 
 import struct
 
-from test_framework.blocktools import create_transaction
 from test_framework.messages import (
     CBlock,
     COutPoint,
@@ -15,38 +14,30 @@ from test_framework.messages import (
 from test_framework.crypto.muhash import MuHash3072
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal
+from test_framework.wallet import MiniWallet
 
 class UTXOSetHashTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 1
         self.setup_clean_chain = True
 
-    def skip_test_if_missing_module(self):
-        self.skip_if_no_wallet()
-
-    def test_deterministic_hash_results(self):
-        self.log.info("Test deterministic UTXO set hash results")
-
-        # These depend on the setup_clean_chain option, the chain loaded from the cache
-        assert_equal(self.nodes[0].gettxoutsetinfo()['hash_serialized_2'], "b61ee2cb582d2f4f94493f3d480e9a59d064706e98a12be0f335a3eeadd5678a")
-        assert_equal(self.nodes[0].gettxoutsetinfo("muhash")['muhash'], "dd5ad2a105c2d29495f577245c357409002329b9f4d6182c0af3dc2f462555c8")
-
     def test_muhash_implementation(self):
         self.log.info("Test MuHash implementation consistency")
 
         node = self.nodes[0]
+        wallet = MiniWallet(node)
+        mocktime = node.getblockheader(node.getblockhash(0))['time'] + 1
+        node.setmocktime(mocktime)
 
         # Generate 100 blocks and remove the first since we plan to spend its
         # coinbase
-        block_hashes = node.generate(100)
+        block_hashes = wallet.generate(1) + node.generate(99)
         blocks = list(map(lambda block: from_hex(CBlock(), node.getblock(block, False)), block_hashes))
-        spending = blocks.pop(0)
+        blocks.pop(0)
 
         # Create a spending transaction and mine a block which includes it
-        tx = create_transaction(node, spending.vtx[0].rehash(), node.getnewaddress(), amount=49)
-        txid = node.sendrawtransaction(hexstring=tx.serialize().hex(), maxfeerate=0)
-
-        tx_block = node.generateblock(node.getnewaddress(), [txid])['hash']
+        txid = wallet.send_self_transfer(from_node=node)['txid']
+        tx_block = node.generateblock(output=wallet.get_address(), transactions=[txid])['hash']
         blocks.append(from_hex(CBlock(), node.getblock(tx_block, False)))
 
         # Serialize the outputs that should be in the UTXO set and add them to
@@ -77,8 +68,11 @@ class UTXOSetHashTest(BitcoinTestFramework):
 
         assert_equal(finalized[::-1].hex(), node_muhash)
 
+        self.log.info("Test deterministic UTXO set hash results")
+        assert_equal(node.gettxoutsetinfo()['hash_serialized_2'], "4eb23b9673b7472e33ebf6e6aefee849fe5bc5e598fd387c2f9222070cc2f711")
+        assert_equal(node.gettxoutsetinfo("muhash")['muhash'], "dd74d7f1fb047577915d490e82d063e843f7853ae7543c9980a28c67326e1a2c")
+
     def run_test(self):
-        self.test_deterministic_hash_results()
         self.test_muhash_implementation()
 
 

test/functional/test_framework/wallet.py

@@ -39,6 +39,9 @@ class MiniWallet:
             self._utxos.append({'txid': cb_tx['txid'], 'vout': 0, 'value': cb_tx['vout'][0]['value']})
         return blocks
 
+    def get_address(self):
+        return self._address
+
     def get_utxo(self, *, txid=''):
         """
         Returns a utxo and marks it as spent (pops it from the internal list)