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[rpc] Allow getrawtransaction to take optional blockhash to fetch transaction from a block directly.

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Karl-Johan Alm 2017-04-25 17:29:24 +09:00
parent a5f5a2ce53
commit b167951677
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GPG key ID: 57AF762DB3353322
3 changed files with 84 additions and 47 deletions
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59
src/rpc/rawtransaction.cpp
View file

@ -64,12 +64,15 @@ void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry)
UniValue getrawtransaction(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
if (request.fHelp || request.params.size() < 1 || request.params.size() > 3)
throw std::runtime_error(
"getrawtransaction \"txid\" ( verbose )\n"
"getrawtransaction \"txid\" ( verbose \"blockhash\" )\n"
"\nNOTE: By default this function only works for mempool transactions. If the -txindex option is\n"
"enabled, it also works for blockchain transactions.\n"
"enabled, it also works for blockchain transactions. If the block which contains the transaction\n"
"is known, its hash can be provided even for nodes without -txindex. Note that if a blockhash is\n"
"provided, only that block will be searched and if the transaction is in the mempool or other\n"
"blocks, or if this node does not have the given block available, the transaction will not be found.\n"
"DEPRECATED: for now, it also works for transactions with unspent outputs.\n"
"\nReturn the raw transaction data.\n"
@ -78,13 +81,15 @@ UniValue getrawtransaction(const JSONRPCRequest& request)
"\nArguments:\n"
"1. \"txid\" (string, required) The transaction id\n"
"2. verbose (bool, optional, default=false) If false, return a string, otherwise return a json object\n"
"2. verbose (bool, optional, default=false) If false, return a string, otherwise return a json object\n"
"3. \"blockhash\" (string, optional) The block in which to look for the transaction\n"
"\nResult (if verbose is not set or set to false):\n"
"\"data\" (string) The serialized, hex-encoded data for 'txid'\n"
"\nResult (if verbose is set to true):\n"
"{\n"
" \"in_active_chain\": b, (bool) Whether specified block is in the active chain or not (only present with explicit \"blockhash\" argument)\n"
" \"hex\" : \"data\", (string) The serialized, hex-encoded data for 'txid'\n"
" \"txid\" : \"id\", (string) The transaction id (same as provided)\n"
" \"hash\" : \"id\", (string) The transaction hash (differs from txid for witness transactions)\n"
@ -132,11 +137,15 @@ UniValue getrawtransaction(const JSONRPCRequest& request)
+ HelpExampleCli("getrawtransaction", "\"mytxid\"")
+ HelpExampleCli("getrawtransaction", "\"mytxid\" true")
+ HelpExampleRpc("getrawtransaction", "\"mytxid\", true")
+ HelpExampleCli("getrawtransaction", "\"mytxid\" false \"myblockhash\"")
+ HelpExampleCli("getrawtransaction", "\"mytxid\" true \"myblockhash\"")
);
LOCK(cs_main);
bool in_active_chain = true;
uint256 hash = ParseHashV(request.params[0], "parameter 1");
CBlockIndex* blockindex = nullptr;
// Accept either a bool (true) or a num (>=1) to indicate verbose output.
bool fVerbose = false;
@ -144,18 +153,42 @@ UniValue getrawtransaction(const JSONRPCRequest& request)
fVerbose = request.params[1].isNum() ? (request.params[1].get_int() != 0) : request.params[1].get_bool();
}
CTransactionRef tx;
uint256 hashBlock;
if (!GetTransaction(hash, tx, Params().GetConsensus(), hashBlock, true))
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, std::string(fTxIndex ? "No such mempool or blockchain transaction"
: "No such mempool transaction. Use -txindex to enable blockchain transaction queries") +
". Use gettransaction for wallet transactions.");
if (!request.params[2].isNull()) {
uint256 blockhash = ParseHashV(request.params[2], "parameter 3");
if (!blockhash.IsNull()) {
BlockMap::iterator it = mapBlockIndex.find(blockhash);
if (it == mapBlockIndex.end()) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block hash not found");
}
blockindex = it->second;
in_active_chain = chainActive.Contains(blockindex);
}
}
if (!fVerbose)
CTransactionRef tx;
uint256 hash_block;
if (!GetTransaction(hash, tx, Params().GetConsensus(), hash_block, true, blockindex)) {
std::string errmsg;
if (blockindex) {
if (!(blockindex->nStatus & BLOCK_HAVE_DATA)) {
throw JSONRPCError(RPC_MISC_ERROR, "Block not available");
}
errmsg = "No such transaction found in the provided block";
} else {
errmsg = fTxIndex
? "No such mempool or blockchain transaction"
: "No such mempool transaction. Use -txindex to enable blockchain transaction queries";
}
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, errmsg + ". Use gettransaction for wallet transactions.");
}
if (!fVerbose) {
return EncodeHexTx(*tx, RPCSerializationFlags());
}
UniValue result(UniValue::VOBJ);
TxToJSON(*tx, hashBlock, result);
if (blockindex) result.push_back(Pair("in_active_chain", in_active_chain));
TxToJSON(*tx, hash_block, result);
return result;
}
@ -983,7 +1016,7 @@ UniValue sendrawtransaction(const JSONRPCRequest& request)
static const CRPCCommand commands[] =
{ // category name actor (function) argNames
// --------------------- ------------------------ ----------------------- ----------
{ "rawtransactions", "getrawtransaction", &getrawtransaction, {"txid","verbose"} },
{ "rawtransactions", "getrawtransaction", &getrawtransaction, {"txid","verbose","blockhash"} },
{ "rawtransactions", "createrawtransaction", &createrawtransaction, {"inputs","outputs","locktime","replaceable"} },
{ "rawtransactions", "decoderawtransaction", &decoderawtransaction, {"hexstring"} },
{ "rawtransactions", "decodescript", &decodescript, {"hexstring"} },

70
src/validation.cpp
View file

@ -926,47 +926,51 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
return AcceptToMemoryPoolWithTime(chainparams, pool, state, tx, pfMissingInputs, GetTime(), plTxnReplaced, bypass_limits, nAbsurdFee);
}
/** Return transaction in txOut, and if it was found inside a block, its hash is placed in hashBlock */
bool GetTransaction(const uint256 &hash, CTransactionRef &txOut, const Consensus::Params& consensusParams, uint256 &hashBlock, bool fAllowSlow)
/**
* Return transaction in txOut, and if it was found inside a block, its hash is placed in hashBlock.
* If blockIndex is provided, the transaction is fetched from the corresponding block.
*/
bool GetTransaction(const uint256& hash, CTransactionRef& txOut, const Consensus::Params& consensusParams, uint256& hashBlock, bool fAllowSlow, CBlockIndex* blockIndex)
{
CBlockIndex *pindexSlow = nullptr;
CBlockIndex* pindexSlow = blockIndex;
LOCK(cs_main);
CTransactionRef ptx = mempool.get(hash);
if (ptx)
{
txOut = ptx;
return true;
}
if (fTxIndex) {
CDiskTxPos postx;
if (pblocktree->ReadTxIndex(hash, postx)) {
CAutoFile file(OpenBlockFile(postx, true), SER_DISK, CLIENT_VERSION);
if (file.IsNull())
return error("%s: OpenBlockFile failed", __func__);
CBlockHeader header;
try {
file >> header;
fseek(file.Get(), postx.nTxOffset, SEEK_CUR);
file >> txOut;
} catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
hashBlock = header.GetHash();
if (txOut->GetHash() != hash)
return error("%s: txid mismatch", __func__);
if (!blockIndex) {
CTransactionRef ptx = mempool.get(hash);
if (ptx) {
txOut = ptx;
return true;
}
// transaction not found in index, nothing more can be done
return false;
}
if (fTxIndex) {
CDiskTxPos postx;
if (pblocktree->ReadTxIndex(hash, postx)) {
CAutoFile file(OpenBlockFile(postx, true), SER_DISK, CLIENT_VERSION);
if (file.IsNull())
return error("%s: OpenBlockFile failed", __func__);
CBlockHeader header;
try {
file >> header;
fseek(file.Get(), postx.nTxOffset, SEEK_CUR);
file >> txOut;
} catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
hashBlock = header.GetHash();
if (txOut->GetHash() != hash)
return error("%s: txid mismatch", __func__);
return true;
}
if (fAllowSlow) { // use coin database to locate block that contains transaction, and scan it
const Coin& coin = AccessByTxid(*pcoinsTip, hash);
if (!coin.IsSpent()) pindexSlow = chainActive[coin.nHeight];
// transaction not found in index, nothing more can be done
return false;
}
if (fAllowSlow) { // use coin database to locate block that contains transaction, and scan it
const Coin& coin = AccessByTxid(*pcoinsTip, hash);
if (!coin.IsSpent()) pindexSlow = chainActive[coin.nHeight];
}
}
if (pindexSlow) {

2
src/validation.h
View file

@ -273,7 +273,7 @@ void ThreadScriptCheck();
/** Check whether we are doing an initial block download (synchronizing from disk or network) */
bool IsInitialBlockDownload();
/** Retrieve a transaction (from memory pool, or from disk, if possible) */
bool GetTransaction(const uint256 &hash, CTransactionRef &tx, const Consensus::Params& params, uint256 &hashBlock, bool fAllowSlow = false);
bool GetTransaction(const uint256& hash, CTransactionRef& tx, const Consensus::Params& params, uint256& hashBlock, bool fAllowSlow = false, CBlockIndex* blockIndex = nullptr);
/** Find the best known block, and make it the tip of the block chain */
bool ActivateBestChain(CValidationState& state, const CChainParams& chainparams, std::shared_ptr<const CBlock> pblock = std::shared_ptr<const CBlock>());
CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);