Add option to return non-segwit serialization via rpc

Github-Pull: bitcoin#9194
Rebased-From: 835c75acaac004c3315395dcd7d1f193dfb9e5da

qa/rpc-tests/segwit.py

@@ -13,6 +13,7 @@
 from test_framework.address import script_to_p2sh, key_to_p2pkh
 from test_framework.script import CScript, OP_HASH160, OP_CHECKSIG, OP_0, hash160, OP_EQUAL, OP_DUP, OP_EQUALVERIFY, OP_1, OP_2, OP_CHECKMULTISIG
 from io import BytesIO
+from test_framework.mininode import FromHex
 
 NODE_0 = 0
 NODE_1 = 1
@@ -83,8 +84,8 @@ def setup_chain(self):
 
     def setup_network(self):
         self.nodes = []
-        self.nodes.append(start_node(0, self.options.tmpdir, ["-logtimemicros", "-debug", "-walletprematurewitness"]))
-        self.nodes.append(start_node(1, self.options.tmpdir, ["-logtimemicros", "-debug", "-blockversion=4", "-promiscuousmempoolflags=517", "-prematurewitness", "-walletprematurewitness"]))
+        self.nodes.append(start_node(0, self.options.tmpdir, ["-logtimemicros", "-debug", "-walletprematurewitness", "-rpcserialversion=0"]))
+        self.nodes.append(start_node(1, self.options.tmpdir, ["-logtimemicros", "-debug", "-blockversion=4", "-promiscuousmempoolflags=517", "-prematurewitness", "-walletprematurewitness", "-rpcserialversion=2"]))
         self.nodes.append(start_node(2, self.options.tmpdir, ["-logtimemicros", "-debug", "-blockversion=536870915", "-promiscuousmempoolflags=517", "-prematurewitness", "-walletprematurewitness"]))
         connect_nodes(self.nodes[1], 0)
         connect_nodes(self.nodes[2], 1)
@@ -210,7 +211,20 @@ def run_test(self):
         block = self.nodes[2].generate(1) #block 432 (first block with new rules; 432 = 144 * 3)
         sync_blocks(self.nodes)
         assert_equal(len(self.nodes[2].getrawmempool()), 0)
-        assert_equal(len(self.nodes[2].getblock(block[0])["tx"]), 5)
+        segwit_tx_list = self.nodes[2].getblock(block[0])["tx"]
+        assert_equal(len(segwit_tx_list), 5)
+
+        print("Verify block and transaction serialization rpcs return differing serializations depending on rpc serialization flag")
+        # Note: node1 has version 2, which is simply >0 and will catch future upgrades in tests
+        assert(self.nodes[2].getblock(block[0], False) !=  self.nodes[0].getblock(block[0], False))
+        assert(self.nodes[1].getblock(block[0], False) ==  self.nodes[2].getblock(block[0], False))
+        for i in range(len(segwit_tx_list)):
+            tx = FromHex(CTransaction(), self.nodes[2].gettransaction(segwit_tx_list[i])["hex"])
+            assert(self.nodes[2].getrawtransaction(segwit_tx_list[i]) != self.nodes[0].getrawtransaction(segwit_tx_list[i]))
+            assert(self.nodes[1].getrawtransaction(segwit_tx_list[i], 0) == self.nodes[2].getrawtransaction(segwit_tx_list[i]))
+            assert(self.nodes[0].getrawtransaction(segwit_tx_list[i]) != self.nodes[2].gettransaction(segwit_tx_list[i])["hex"])
+            assert(self.nodes[1].getrawtransaction(segwit_tx_list[i]) == self.nodes[2].gettransaction(segwit_tx_list[i])["hex"])
+            assert(self.nodes[0].getrawtransaction(segwit_tx_list[i]) == bytes_to_hex_str(tx.serialize_without_witness()))
 
         print("Verify witness txs without witness data are invalid after the fork")
         self.fail_mine(self.nodes[2], wit_ids[NODE_2][WIT_V0][2], False)

src/core_io.h

@@ -25,7 +25,7 @@ extern std::vector<unsigned char> ParseHexUV(const UniValue& v, const std::strin
 
 // core_write.cpp
 extern std::string FormatScript(const CScript& script);
-extern std::string EncodeHexTx(const CTransaction& tx);
+extern std::string EncodeHexTx(const CTransaction& tx, const int serializeFlags = 0);
 extern void ScriptPubKeyToUniv(const CScript& scriptPubKey, UniValue& out, bool fIncludeHex);
 extern void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry);
 

src/core_write.cpp

@@ -116,9 +116,9 @@ string ScriptToAsmStr(const CScript& script, const bool fAttemptSighashDecode)
     return str;
 }
 
-string EncodeHexTx(const CTransaction& tx)
+string EncodeHexTx(const CTransaction& tx, const int serialFlags)
 {
-    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION | serialFlags);
     ssTx << tx;
     return HexStr(ssTx.begin(), ssTx.end());
 }

src/init.cpp

@@ -364,6 +364,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-port=<port>", strprintf(_("Listen for connections on <port> (default: %u or testnet: %u)"), Params(CBaseChainParams::MAIN).GetDefaultPort(), Params(CBaseChainParams::TESTNET).GetDefaultPort()));
     strUsage += HelpMessageOpt("-proxy=<ip:port>", _("Connect through SOCKS5 proxy"));
     strUsage += HelpMessageOpt("-proxyrandomize", strprintf(_("Randomize credentials for every proxy connection. This enables Tor stream isolation (default: %u)"), DEFAULT_PROXYRANDOMIZE));
+    strUsage += HelpMessageOpt("-rpcserialversion", strprintf(_("Sets the serialization of raw transaction or block hex returned in non-verbose mode, non-segwit(0) or segwit(>0) (default: %d)"), DEFAULT_RPC_SERIALIZE_VERSION));
     strUsage += HelpMessageOpt("-seednode=<ip>", _("Connect to a node to retrieve peer addresses, and disconnect"));
     strUsage += HelpMessageOpt("-timeout=<n>", strprintf(_("Specify connection timeout in milliseconds (minimum: 1, default: %d)"), DEFAULT_CONNECT_TIMEOUT));
     strUsage += HelpMessageOpt("-torcontrol=<ip>:<port>", strprintf(_("Tor control port to use if onion listening enabled (default: %s)"), DEFAULT_TOR_CONTROL));
@@ -982,6 +983,9 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
     if (GetBoolArg("-peerbloomfilters", DEFAULT_PEERBLOOMFILTERS))
         nLocalServices = ServiceFlags(nLocalServices | NODE_BLOOM);
 
+    if (GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) < 0)
+        return InitError("rpcserialversion must be non-negative.");
+
     nMaxTipAge = GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);
 
     fEnableReplacement = GetBoolArg("-mempoolreplacement", DEFAULT_ENABLE_REPLACEMENT);

src/rpc/blockchain.cpp

@@ -607,7 +607,7 @@ UniValue getblock(const UniValue& params, bool fHelp)
 
     if (!fVerbose)
     {
-        CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
+        CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION | RPCSerializationFlags());
         ssBlock << block;
         std::string strHex = HexStr(ssBlock.begin(), ssBlock.end());
         return strHex;

src/rpc/rawtransaction.cpp

@@ -209,7 +209,7 @@ UniValue getrawtransaction(const UniValue& params, bool fHelp)
     if (!GetTransaction(hash, tx, Params().GetConsensus(), hashBlock, true))
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No information available about transaction");
 
-    string strHex = EncodeHexTx(tx);
+    string strHex = EncodeHexTx(tx, RPCSerializationFlags());
 
     if (!fVerbose)
         return strHex;

src/rpc/server.cpp

@@ -495,4 +495,12 @@ void RPCRunLater(const std::string& name, boost::function<void(void)> func, int6
     deadlineTimers.insert(std::make_pair(name, boost::shared_ptr<RPCTimerBase>(timerInterface->NewTimer(func, nSeconds*1000))));
 }
 
+int RPCSerializationFlags()
+{
+    int flag = 0;
+    if (GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) == 0)
+        flag |= SERIALIZE_TRANSACTION_NO_WITNESS;
+    return flag;
+}
+
 CRPCTable tableRPC;

src/rpc/server.h

@@ -19,6 +19,8 @@
 
 #include <univalue.h>
 
+static const unsigned int DEFAULT_RPC_SERIALIZE_VERSION = 1;
+
 class CRPCCommand;
 
 namespace RPCServer
@@ -195,4 +197,7 @@ void InterruptRPC();
 void StopRPC();
 std::string JSONRPCExecBatch(const UniValue& vReq);
 
+// Retrieves any serialization flags requested in command line argument
+int RPCSerializationFlags();
+
 #endif // BITCOIN_RPCSERVER_H

src/wallet/rpcwallet.cpp

@@ -1780,7 +1780,7 @@ UniValue gettransaction(const UniValue& params, bool fHelp)
     ListTransactions(wtx, "*", 0, false, details, filter);
     entry.push_back(Pair("details", details));
 
-    string strHex = EncodeHexTx(static_cast<CTransaction>(wtx));
+    string strHex = EncodeHexTx(static_cast<CTransaction>(wtx), RPCSerializationFlags());
     entry.push_back(Pair("hex", strHex));
 
     return entry;