Add RPC call to generate and verify merkle blocks

This commit is contained in:
Matt Corallo 2014-11-01 16:01:48 -07:00
parent 30da90de8d
commit 59ed61b389
4 changed files with 119 additions and 0 deletions

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@ -79,6 +79,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
{ "sendrawtransaction", 1 },
{ "gettxout", 1 },
{ "gettxout", 2 },
{ "gettxoutproof", 0 },
{ "lockunspent", 0 },
{ "lockunspent", 1 },
{ "importprivkey", 2 },

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@ -9,6 +9,7 @@
#include "init.h"
#include "keystore.h"
#include "main.h"
#include "merkleblock.h"
#include "net.h"
#include "rpcserver.h"
#include "script/script.h"
@ -193,6 +194,119 @@ Value getrawtransaction(const Array& params, bool fHelp)
return result;
}
Value gettxoutproof(const Array& params, bool fHelp)
{
if (fHelp || (params.size() != 1 && params.size() != 2))
throw runtime_error(
"gettxoutproof [\"txid\",...] ( blockhash )\n"
"\nReturns a hex-encoded proof that \"txid\" was included in a block.\n"
"\nNOTE: By default this function only works sometimes. This is when there is an\n"
"unspent output in the utxo for this transaction. To make it always work,\n"
"you need to maintain a transaction index, using the -txindex command line option or\n"
"specify the block in which the transaction is included in manually (by blockhash).\n"
"\nReturn the raw transaction data.\n"
"\nArguments:\n"
"1. \"txids\" (string) A json array of txids to filter\n"
" [\n"
" \"txid\" (string) A transaction hash\n"
" ,...\n"
" ]\n"
"2. \"block hash\" (string, optional) If specified, looks for txid in the block with this hash\n"
"\nResult:\n"
"\"data\" (string) A string that is a serialized, hex-encoded data for the proof.\n"
);
set<uint256> setTxids;
uint256 oneTxid;
Array txids = params[0].get_array();
BOOST_FOREACH(Value& txid, txids) {
if (txid.get_str().length() != 64 || !IsHex(txid.get_str()))
throw JSONRPCError(RPC_INVALID_PARAMETER, string("Invalid txid ")+txid.get_str());
uint256 hash(uint256S(txid.get_str()));
if (setTxids.count(hash))
throw JSONRPCError(RPC_INVALID_PARAMETER, string("Invalid parameter, duplicated txid: ")+txid.get_str());
setTxids.insert(hash);
oneTxid = hash;
}
LOCK(cs_main);
CBlockIndex* pblockindex = NULL;
uint256 hashBlock;
if (params.size() > 1)
{
hashBlock = uint256S(params[1].get_str());
if (!mapBlockIndex.count(hashBlock))
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
pblockindex = mapBlockIndex[hashBlock];
} else {
CCoins coins;
if (pcoinsTip->GetCoins(oneTxid, coins) && coins.nHeight > 0 && coins.nHeight <= chainActive.Height())
pblockindex = chainActive[coins.nHeight];
}
if (pblockindex == NULL)
{
CTransaction tx;
if (!GetTransaction(oneTxid, tx, hashBlock, false) || hashBlock.IsNull())
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not yet in block");
if (!mapBlockIndex.count(hashBlock))
throw JSONRPCError(RPC_INTERNAL_ERROR, "Transaction index corrupt");
pblockindex = mapBlockIndex[hashBlock];
}
CBlock block;
if(!ReadBlockFromDisk(block, pblockindex))
throw JSONRPCError(RPC_INTERNAL_ERROR, "Can't read block from disk");
unsigned int ntxFound = 0;
BOOST_FOREACH(const CTransaction&tx, block.vtx)
if (setTxids.count(tx.GetHash()))
ntxFound++;
if (ntxFound != setTxids.size())
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "(Not all) transactions not found in specified block");
CDataStream ssMB(SER_NETWORK, PROTOCOL_VERSION);
CMerkleBlock mb(block, setTxids);
ssMB << mb;
std::string strHex = HexStr(ssMB.begin(), ssMB.end());
return strHex;
}
Value verifytxoutproof(const Array& params, bool fHelp)
{
if (fHelp || params.size() != 1)
throw runtime_error(
"verifytxoutproof \"proof\"\n"
"\nVerifies that a proof points to a transaction in a block, returning the transaction it commits to\n"
"and throwing an RPC error if the block is not in our best chain\n"
"\nArguments:\n"
"1. \"proof\" (string, required) The hex-encoded proof generated by gettxoutproof\n"
"\nResult:\n"
"[\"txid\"] (array, strings) The txid(s) which the proof commits to, or empty array if the proof is invalid\n"
);
CDataStream ssMB(ParseHexV(params[0], "proof"), SER_NETWORK, PROTOCOL_VERSION);
CMerkleBlock merkleBlock;
ssMB >> merkleBlock;
Array res;
vector<uint256> vMatch;
if (merkleBlock.txn.ExtractMatches(vMatch) != merkleBlock.header.hashMerkleRoot)
return res;
LOCK(cs_main);
if (!mapBlockIndex.count(merkleBlock.header.GetHash()) || !chainActive.Contains(mapBlockIndex[merkleBlock.header.GetHash()]))
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found in chain");
BOOST_FOREACH(const uint256& hash, vMatch)
res.push_back(hash.GetHex());
return res;
}
Value createrawtransaction(const Array& params, bool fHelp)
{
if (fHelp || params.size() != 2)

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@ -293,6 +293,8 @@ static const CRPCCommand vRPCCommands[] =
{ "blockchain", "getmempoolinfo", &getmempoolinfo, true },
{ "blockchain", "getrawmempool", &getrawmempool, true },
{ "blockchain", "gettxout", &gettxout, true },
{ "blockchain", "gettxoutproof", &gettxoutproof, true },
{ "blockchain", "verifytxoutproof", &verifytxoutproof, true },
{ "blockchain", "gettxoutsetinfo", &gettxoutsetinfo, true },
{ "blockchain", "verifychain", &verifychain, true },

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@ -218,6 +218,8 @@ extern json_spirit::Value decoderawtransaction(const json_spirit::Array& params,
extern json_spirit::Value decodescript(const json_spirit::Array& params, bool fHelp);
extern json_spirit::Value signrawtransaction(const json_spirit::Array& params, bool fHelp);
extern json_spirit::Value sendrawtransaction(const json_spirit::Array& params, bool fHelp);
extern json_spirit::Value gettxoutproof(const json_spirit::Array& params, bool fHelp);
extern json_spirit::Value verifytxoutproof(const json_spirit::Array& params, bool fHelp);
extern json_spirit::Value getblockcount(const json_spirit::Array& params, bool fHelp); // in rpcblockchain.cpp
extern json_spirit::Value getbestblockhash(const json_spirit::Array& params, bool fHelp);