From 6b4f231f5f0f88690488c4da20ea1c180dbc4b19 Mon Sep 17 00:00:00 2001 From: Andrew Chow Date: Fri, 9 Jun 2017 22:38:06 -0700 Subject: [PATCH] Move transaction combining from signrawtransaction to new RPC Create a combinerawtransaction RPC which accepts a json array of hex raw transactions to combine them into one transaction. Signrawtransaction is changed to no longer combine transactions and only accept one transaction at a time. --- src/rpc/client.cpp | 1 + src/rpc/rawtransaction.cpp | 135 ++++++++++++++++++------- test/functional/rawtransactions.py | 57 ++++++++++- test/functional/signrawtransactions.py | 16 --- 4 files changed, 154 insertions(+), 55 deletions(-) diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp index 775ad4b6c..d82e85f82 100644 --- a/src/rpc/client.cpp +++ b/src/rpc/client.cpp @@ -95,6 +95,7 @@ static const CRPCConvertParam vRPCConvertParams[] = { "signrawtransaction", 1, "prevtxs" }, { "signrawtransaction", 2, "privkeys" }, { "sendrawtransaction", 1, "allowhighfees" }, + { "combinerawtransaction", 0, "txs" }, { "fundrawtransaction", 1, "options" }, { "gettxout", 1, "n" }, { "gettxout", 2, "include_mempool" }, diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp index b878624df..10886fea9 100644 --- a/src/rpc/rawtransaction.cpp +++ b/src/rpc/rawtransaction.cpp @@ -554,6 +554,93 @@ static void TxInErrorToJSON(const CTxIn& txin, UniValue& vErrorsRet, const std:: vErrorsRet.push_back(entry); } +UniValue combinerawtransaction(const JSONRPCRequest& request) +{ + + if (request.fHelp || request.params.size() != 1) + throw std::runtime_error( + "combinerawtransaction [\"hexstring\",...]\n" + "\nCombine multiple partially signed transactions into one transaction.\n" + "The combined transaction may be another partially signed transaction or a \n" + "fully signed transaction." + + "\nArguments:\n" + "1. \"txs\" (string) A json array of hex strings of partially signed transactions\n" + " [\n" + " \"hexstring\" (string) A transaction hash\n" + " ,...\n" + " ]\n" + + "\nResult:\n" + "\"hex\" : \"value\", (string) The hex-encoded raw transaction with signature(s)\n" + + "\nExamples:\n" + + HelpExampleCli("combinerawtransaction", "[\"myhex1\", \"myhex2\", \"myhex3\"]") + ); + + + UniValue txs = request.params[0].get_array(); + std::vector txVariants(txs.size()); + + for (unsigned int idx = 0; idx < txs.size(); idx++) { + if (!DecodeHexTx(txVariants[idx], txs[idx].get_str(), true)) { + throw JSONRPCError(RPC_DESERIALIZATION_ERROR, strprintf("TX decode failed for tx %d", idx)); + } + } + + if (txVariants.empty()) { + throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Missing transactions"); + } + + // mergedTx will end up with all the signatures; it + // starts as a clone of the rawtx: + CMutableTransaction mergedTx(txVariants[0]); + + // Fetch previous transactions (inputs): + CCoinsView viewDummy; + CCoinsViewCache view(&viewDummy); + { + LOCK(cs_main); + LOCK(mempool.cs); + CCoinsViewCache &viewChain = *pcoinsTip; + CCoinsViewMemPool viewMempool(&viewChain, mempool); + view.SetBackend(viewMempool); // temporarily switch cache backend to db+mempool view + + for (const CTxIn& txin : mergedTx.vin) { + view.AccessCoin(txin.prevout); // Load entries from viewChain into view; can fail. + } + + view.SetBackend(viewDummy); // switch back to avoid locking mempool for too long + } + + // Use CTransaction for the constant parts of the + // transaction to avoid rehashing. + const CTransaction txConst(mergedTx); + // Sign what we can: + for (unsigned int i = 0; i < mergedTx.vin.size(); i++) { + CTxIn& txin = mergedTx.vin[i]; + const Coin& coin = view.AccessCoin(txin.prevout); + if (coin.IsSpent()) { + throw JSONRPCError(RPC_VERIFY_ERROR, "Input not found or already spent"); + } + const CScript& prevPubKey = coin.out.scriptPubKey; + const CAmount& amount = coin.out.nValue; + + SignatureData sigdata; + + // ... and merge in other signatures: + for (const CMutableTransaction& txv : txVariants) { + if (txv.vin.size() > i) { + sigdata = CombineSignatures(prevPubKey, TransactionSignatureChecker(&txConst, i, amount), sigdata, DataFromTransaction(txv, i)); + } + } + + UpdateTransaction(mergedTx, i, sigdata); + } + + return EncodeHexTx(mergedTx); +} + UniValue signrawtransaction(const JSONRPCRequest& request) { #ifdef ENABLE_WALLET @@ -626,26 +713,9 @@ UniValue signrawtransaction(const JSONRPCRequest& request) #endif RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VARR, UniValue::VARR, UniValue::VSTR}, true); - std::vector txData(ParseHexV(request.params[0], "argument 1")); - CDataStream ssData(txData, SER_NETWORK, PROTOCOL_VERSION); - std::vector txVariants; - while (!ssData.empty()) { - try { - CMutableTransaction tx; - ssData >> tx; - txVariants.push_back(tx); - } - catch (const std::exception&) { - throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed"); - } - } - - if (txVariants.empty()) - throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Missing transaction"); - - // mergedTx will end up with all the signatures; it - // starts as a clone of the rawtx: - CMutableTransaction mergedTx(txVariants[0]); + CMutableTransaction mtx; + if (!DecodeHexTx(mtx, request.params[0].get_str(), true)) + throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed"); // Fetch previous transactions (inputs): CCoinsView viewDummy; @@ -656,7 +726,7 @@ UniValue signrawtransaction(const JSONRPCRequest& request) CCoinsViewMemPool viewMempool(&viewChain, mempool); view.SetBackend(viewMempool); // temporarily switch cache backend to db+mempool view - for (const CTxIn& txin : mergedTx.vin) { + for (const CTxIn& txin : mtx.vin) { view.AccessCoin(txin.prevout); // Load entries from viewChain into view; can fail. } @@ -781,10 +851,10 @@ UniValue signrawtransaction(const JSONRPCRequest& request) // Use CTransaction for the constant parts of the // transaction to avoid rehashing. - const CTransaction txConst(mergedTx); + const CTransaction txConst(mtx); // Sign what we can: - for (unsigned int i = 0; i < mergedTx.vin.size(); i++) { - CTxIn& txin = mergedTx.vin[i]; + for (unsigned int i = 0; i < mtx.vin.size(); i++) { + CTxIn& txin = mtx.vin[i]; const Coin& coin = view.AccessCoin(txin.prevout); if (coin.IsSpent()) { TxInErrorToJSON(txin, vErrors, "Input not found or already spent"); @@ -795,17 +865,11 @@ UniValue signrawtransaction(const JSONRPCRequest& request) SignatureData sigdata; // Only sign SIGHASH_SINGLE if there's a corresponding output: - if (!fHashSingle || (i < mergedTx.vout.size())) - ProduceSignature(MutableTransactionSignatureCreator(&keystore, &mergedTx, i, amount, nHashType), prevPubKey, sigdata); + if (!fHashSingle || (i < mtx.vout.size())) + ProduceSignature(MutableTransactionSignatureCreator(&keystore, &mtx, i, amount, nHashType), prevPubKey, sigdata); + sigdata = CombineSignatures(prevPubKey, TransactionSignatureChecker(&txConst, i, amount), sigdata, DataFromTransaction(mtx, i)); - // ... and merge in other signatures: - for (const CMutableTransaction& txv : txVariants) { - if (txv.vin.size() > i) { - sigdata = CombineSignatures(prevPubKey, TransactionSignatureChecker(&txConst, i, amount), sigdata, DataFromTransaction(txv, i)); - } - } - - UpdateTransaction(mergedTx, i, sigdata); + UpdateTransaction(mtx, i, sigdata); ScriptError serror = SCRIPT_ERR_OK; if (!VerifyScript(txin.scriptSig, prevPubKey, &txin.scriptWitness, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), &serror)) { @@ -815,7 +879,7 @@ UniValue signrawtransaction(const JSONRPCRequest& request) bool fComplete = vErrors.empty(); UniValue result(UniValue::VOBJ); - result.push_back(Pair("hex", EncodeHexTx(mergedTx))); + result.push_back(Pair("hex", EncodeHexTx(mtx))); result.push_back(Pair("complete", fComplete)); if (!vErrors.empty()) { result.push_back(Pair("errors", vErrors)); @@ -905,6 +969,7 @@ static const CRPCCommand commands[] = { "rawtransactions", "decoderawtransaction", &decoderawtransaction, true, {"hexstring"} }, { "rawtransactions", "decodescript", &decodescript, true, {"hexstring"} }, { "rawtransactions", "sendrawtransaction", &sendrawtransaction, false, {"hexstring","allowhighfees"} }, + { "rawtransactions", "combinerawtransaction", &combinerawtransaction, true, {"txs"} }, { "rawtransactions", "signrawtransaction", &signrawtransaction, false, {"hexstring","prevtxs","privkeys","sighashtype"} }, /* uses wallet if enabled */ { "blockchain", "gettxoutproof", &gettxoutproof, true, {"txids", "blockhash"} }, diff --git a/test/functional/rawtransactions.py b/test/functional/rawtransactions.py index 35debf9ca..6272fc69b 100755 --- a/test/functional/rawtransactions.py +++ b/test/functional/rawtransactions.py @@ -114,7 +114,7 @@ class RawTransactionsTest(BitcoinTestFramework): rawTx = self.nodes[2].createrawtransaction(inputs, outputs) rawTxPartialSigned = self.nodes[1].signrawtransaction(rawTx, inputs) assert_equal(rawTxPartialSigned['complete'], False) #node1 only has one key, can't comp. sign the tx - + rawTxSigned = self.nodes[2].signrawtransaction(rawTx, inputs) assert_equal(rawTxSigned['complete'], True) #node2 can sign the tx compl., own two of three keys self.nodes[2].sendrawtransaction(rawTxSigned['hex']) @@ -124,6 +124,55 @@ class RawTransactionsTest(BitcoinTestFramework): self.sync_all() assert_equal(self.nodes[0].getbalance(), bal+Decimal('50.00000000')+Decimal('2.19000000')) #block reward + tx + # 2of2 test for combining transactions + bal = self.nodes[2].getbalance() + addr1 = self.nodes[1].getnewaddress() + addr2 = self.nodes[2].getnewaddress() + + addr1Obj = self.nodes[1].validateaddress(addr1) + addr2Obj = self.nodes[2].validateaddress(addr2) + + self.nodes[1].addmultisigaddress(2, [addr1Obj['pubkey'], addr2Obj['pubkey']]) + mSigObj = self.nodes[2].addmultisigaddress(2, [addr1Obj['pubkey'], addr2Obj['pubkey']]) + mSigObjValid = self.nodes[2].validateaddress(mSigObj) + + txId = self.nodes[0].sendtoaddress(mSigObj, 2.2) + decTx = self.nodes[0].gettransaction(txId) + rawTx2 = self.nodes[0].decoderawtransaction(decTx['hex']) + self.sync_all() + self.nodes[0].generate(1) + self.sync_all() + + assert_equal(self.nodes[2].getbalance(), bal) # the funds of a 2of2 multisig tx should not be marked as spendable + + 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 + + bal = self.nodes[0].getbalance() + inputs = [{ "txid" : txId, "vout" : vout['n'], "scriptPubKey" : vout['scriptPubKey']['hex'], "redeemScript" : mSigObjValid['hex']}] + outputs = { self.nodes[0].getnewaddress() : 2.19 } + rawTx2 = self.nodes[2].createrawtransaction(inputs, outputs) + rawTxPartialSigned1 = self.nodes[1].signrawtransaction(rawTx2, inputs) + self.log.info(rawTxPartialSigned1) + assert_equal(rawTxPartialSigned['complete'], False) #node1 only has one key, can't comp. sign the tx + + rawTxPartialSigned2 = self.nodes[2].signrawtransaction(rawTx2, inputs) + self.log.info(rawTxPartialSigned2) + assert_equal(rawTxPartialSigned2['complete'], False) #node2 only has one key, can't comp. sign the tx + rawTxComb = self.nodes[2].combinerawtransaction([rawTxPartialSigned1['hex'], rawTxPartialSigned2['hex']]) + self.log.info(rawTxComb) + self.nodes[2].sendrawtransaction(rawTxComb) + rawTx2 = self.nodes[0].decoderawtransaction(rawTxComb) + self.sync_all() + self.nodes[0].generate(1) + self.sync_all() + assert_equal(self.nodes[0].getbalance(), bal+Decimal('50.00000000')+Decimal('2.19000000')) #block reward + tx + # getrawtransaction tests # 1. valid parameters - only supply txid txHash = rawTx["hash"] @@ -156,17 +205,17 @@ class RawTransactionsTest(BitcoinTestFramework): rawtx = self.nodes[0].createrawtransaction(inputs, outputs) decrawtx= self.nodes[0].decoderawtransaction(rawtx) assert_equal(decrawtx['vin'][0]['sequence'], 1000) - + # 9. invalid parameters - sequence number out of range inputs = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : -1}] outputs = { self.nodes[0].getnewaddress() : 1 } assert_raises_jsonrpc(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs) - + # 10. invalid parameters - sequence number out of range inputs = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 4294967296}] outputs = { self.nodes[0].getnewaddress() : 1 } assert_raises_jsonrpc(-8, 'Invalid parameter, sequence number is out of range', self.nodes[0].createrawtransaction, inputs, outputs) - + inputs = [ {'txid' : "1d1d4e24ed99057e84c3f80fd8fbec79ed9e1acee37da269356ecea000000000", 'vout' : 1, 'sequence' : 4294967294}] outputs = { self.nodes[0].getnewaddress() : 1 } rawtx = self.nodes[0].createrawtransaction(inputs, outputs) diff --git a/test/functional/signrawtransactions.py b/test/functional/signrawtransactions.py index 437905e76..415727268 100755 --- a/test/functional/signrawtransactions.py +++ b/test/functional/signrawtransactions.py @@ -43,22 +43,6 @@ class SignRawTransactionsTest(BitcoinTestFramework): # 2) No script verification error occurred assert 'errors' not in rawTxSigned - # Check that signrawtransaction doesn't blow up on garbage merge attempts - dummyTxInconsistent = self.nodes[0].createrawtransaction([inputs[0]], outputs) - rawTxUnsigned = self.nodes[0].signrawtransaction(rawTx + dummyTxInconsistent, inputs) - - assert 'complete' in rawTxUnsigned - assert_equal(rawTxUnsigned['complete'], False) - - # Check that signrawtransaction properly merges unsigned and signed txn, even with garbage in the middle - rawTxSigned2 = self.nodes[0].signrawtransaction(rawTxUnsigned["hex"] + dummyTxInconsistent + rawTxSigned["hex"], inputs) - - assert 'complete' in rawTxSigned2 - assert_equal(rawTxSigned2['complete'], True) - - assert 'errors' not in rawTxSigned2 - - def script_verification_error_test(self): """Create and sign a raw transaction with valid (vin 0), invalid (vin 1) and one missing (vin 2) input script.