Minimal BIP 22 (getblocktemplate) support

- Replaces getmemorypool with new getblocktemplate
- Add missing keys: coinbaseaux, target, mutable, noncerange, sigoplimit, sizelimit, and height
- Accept and send parameter Objects, checking "mode" key if present
- Return rejection reason "rejected" for submit mode

src/bitcoinrpc.cpp

@@ -1862,24 +1862,43 @@ Value getwork(const Array& params, bool fHelp)
 }
 
 
-Value getmemorypool(const Array& params, bool fHelp)
+Value getblocktemplate(const Array& params, bool fHelp)
 {
-    if (fHelp || params.size() > 1)
+    if (fHelp || params.size() != 1)
         throw runtime_error(
-            "getmemorypool [data]\n"
+            "getblocktemplate [params]\n"
-            "If [data] is not specified, returns data needed to construct a block to work on:\n"
+            "If [params] does not contain a \"data\" key, returns data needed to construct a block to work on:\n"
             "  \"version\" : block version\n"
             "  \"previousblockhash\" : hash of current highest block\n"
             "  \"transactions\" : contents of non-coinbase transactions that should be included in the next block\n"
+            "  \"coinbaseaux\" : data that should be included in coinbase\n"
             "  \"coinbasevalue\" : maximum allowable input to coinbase transaction, including the generation award and transaction fees\n"
-            "  \"coinbaseflags\" : data that should be included in coinbase so support for new features can be judged\n"
+            "  \"target\" : hash target\n"
-            "  \"time\" : timestamp appropriate for next block\n"
             "  \"mintime\" : minimum timestamp appropriate for next block\n"
             "  \"curtime\" : current timestamp\n"
+            "  \"mutable\" : list of ways the block template may be changed\n"
+            "  \"noncerange\" : range of valid nonces\n"
+            "  \"sigoplimit\" : limit of sigops in blocks\n"
+            "  \"sizelimit\" : limit of block size\n"
             "  \"bits\" : compressed target of next block\n"
-            "If [data] is specified, tries to solve the block and returns true if it was successful.");
+            "  \"height\" : height of the next block\n"
+            "If [params] does contain a \"data\" key, tries to solve the block and returns null if it was successful (and \"rejected\" if not)\n"
+            "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.");
 
-    if (params.size() == 0)
+    const Object& oparam = params[0].get_obj();
+    std::string strMode;
+    {
+        const Value& modeval = find_value(oparam, "mode");
+        if (modeval.type() == str_type)
+            strMode = modeval.get_str();
+        else
+        if (find_value(oparam, "data").type() == null_type)
+            strMode = "template";
+        else
+            strMode = "submit";
+    }
+
+    if (strMode == "template")
     {
         if (vNodes.empty())
             throw JSONRPCError(-9, "Bitcoin is not connected!");
@@ -1914,38 +1933,93 @@ Value getmemorypool(const Array& params, bool fHelp)
         pblock->nNonce = 0;
 
         Array transactions;
-        BOOST_FOREACH(CTransaction tx, pblock->vtx) {
+        map<uint256, int64_t> setTxIndex;
+        int i = 0;
+        CTxDB txdb("r");
+        BOOST_FOREACH (CTransaction& tx, pblock->vtx)
+        {
+            uint256 txHash = tx.GetHash();
+            setTxIndex[txHash] = i++;
+
             if (tx.IsCoinBase())
                 continue;
 
-            CDataStream ssTx;
+            Object entry;
-            ssTx << tx;
 
-            transactions.push_back(HexStr(ssTx.begin(), ssTx.end()));
+            CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+            ssTx << tx;
+            entry.push_back(Pair("data", HexStr(ssTx.begin(), ssTx.end())));
+
+            entry.push_back(Pair("hash", txHash.GetHex()));
+
+            MapPrevTx mapInputs;
+            map<uint256, CTxIndex> mapUnused;
+            bool fInvalid = false;
+            if (tx.FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
+            {
+                entry.push_back(Pair("fee", (int64_t)(tx.GetValueIn(mapInputs) - tx.GetValueOut())));
+
+                Array deps;
+                BOOST_FOREACH (MapPrevTx::value_type& inp, mapInputs)
+                {
+                    if (setTxIndex.count(inp.first))
+                        deps.push_back(setTxIndex[inp.first]);
+                }
+                entry.push_back(Pair("depends", deps));
+
+                int64_t nSigOps = tx.GetLegacySigOpCount();
+                nSigOps += tx.GetP2SHSigOpCount(mapInputs);
+                entry.push_back(Pair("sigops", nSigOps));
+            }
+
+            transactions.push_back(entry);
+        }
+
+        Object aux;
+        aux.push_back(Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));
+
+        uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
+
+        static Array aMutable;
+        if (aMutable.empty())
+        {
+            aMutable.push_back("time");
+            aMutable.push_back("transactions");
+            aMutable.push_back("prevblock");
         }
 
         Object result;
         result.push_back(Pair("version", pblock->nVersion));
         result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex()));
         result.push_back(Pair("transactions", transactions));
+        result.push_back(Pair("coinbaseaux", aux));
         result.push_back(Pair("coinbasevalue", (int64_t)pblock->vtx[0].vout[0].nValue));
-        result.push_back(Pair("coinbaseflags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));
+        result.push_back(Pair("target", hashTarget.GetHex()));
-        result.push_back(Pair("time", (int64_t)pblock->nTime));
         result.push_back(Pair("mintime", (int64_t)pindexPrev->GetMedianTimePast()+1));
-        result.push_back(Pair("curtime", (int64_t)GetAdjustedTime()));
+        result.push_back(Pair("mutable", aMutable));
+        result.push_back(Pair("noncerange", "00000000ffffffff"));
+        result.push_back(Pair("sigoplimit", (int64_t)MAX_BLOCK_SIGOPS));
+        result.push_back(Pair("sizelimit", (int64_t)MAX_BLOCK_SIZE));
+        result.push_back(Pair("curtime", (int64_t)pblock->nTime));
         result.push_back(Pair("bits", HexBits(pblock->nBits)));
+        result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight+1)));
 
         return result;
     }
     else
+    if (strMode == "submit")
     {
         // Parse parameters
-        CDataStream ssBlock(ParseHex(params[0].get_str()));
+        CDataStream ssBlock(ParseHex(find_value(oparam, "data").get_str()), SER_NETWORK, PROTOCOL_VERSION);
         CBlock pblock;
         ssBlock >> pblock;
 
-        return ProcessBlock(NULL, &pblock);
+        bool fAccepted = ProcessBlock(NULL, &pblock);
+
+        return fAccepted ? Value::null : "rejected";
     }
+
+    throw JSONRPCError(-8, "Invalid mode");
 }
 
 Value getblockhash(const Array& params, bool fHelp)
@@ -2044,7 +2118,7 @@ pair<string, rpcfn_type> pCallTable[] =
     make_pair("getwork",                &getwork),
     make_pair("listaccounts",           &listaccounts),
     make_pair("settxfee",               &settxfee),
-    make_pair("getmemorypool",          &getmemorypool),
+    make_pair("getblocktemplate",       &getblocktemplate),
     make_pair("listsinceblock",         &listsinceblock),
     make_pair("dumpprivkey",            &dumpprivkey),
     make_pair("importprivkey",          &importprivkey)
@@ -2074,7 +2148,7 @@ string pAllowInSafeMode[] =
     "walletlock",
     "validateaddress",
     "getwork",
-    "getmemorypool",
+    "getblocktemplate",
 };
 set<string> setAllowInSafeMode(pAllowInSafeMode, pAllowInSafeMode + sizeof(pAllowInSafeMode)/sizeof(pAllowInSafeMode[0]));
 
@@ -2499,7 +2573,7 @@ void ThreadRPCServer2(void* parg)
             if (valMethod.type() != str_type)
                 throw JSONRPCError(-32600, "Method must be a string");
             string strMethod = valMethod.get_str();
-            if (strMethod != "getwork" && strMethod != "getmemorypool")
+            if (strMethod != "getwork" && strMethod != "getblocktemplate")
                 printf("ThreadRPCServer method=%s\n", strMethod.c_str());
 
             // Parse params
@@ -2681,6 +2755,7 @@ int CommandLineRPC(int argc, char *argv[])
         if (strMethod == "listtransactions"       && n > 2) ConvertTo<boost::int64_t>(params[2]);
         if (strMethod == "listaccounts"           && n > 0) ConvertTo<boost::int64_t>(params[0]);
         if (strMethod == "walletpassphrase"       && n > 1) ConvertTo<boost::int64_t>(params[1]);
+        if (strMethod == "getblocktemplate"       && n > 0) ConvertTo<Object>(params[0]);
         if (strMethod == "listsinceblock"         && n > 1) ConvertTo<boost::int64_t>(params[1]);
         if (strMethod == "sendmany"               && n > 1)
         {