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rpc: Add getblockfilter RPC method.

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Retrieves and returns block filter and header from index.
This commit is contained in:
Jim Posen
2018-08-31 13:28:12 -07:00
parent ff35105096
commit 19308c9e21
3 changed files with 142 additions and 0 deletions
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82
src/rpc/blockchain.cpp
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@@ -7,6 +7,7 @@
#include <amount.h>
#include <base58.h>
#include <blockfilter.h>
#include <chain.h>
#include <chainparams.h>
#include <checkpoints.h>
@@ -14,6 +15,7 @@
#include <consensus/validation.h>
#include <core_io.h>
#include <hash.h>
#include <index/blockfilterindex.h>
#include <index/txindex.h>
#include <key_io.h>
#include <policy/feerate.h>
@@ -2296,6 +2298,85 @@ UniValue scantxoutset(const JSONRPCRequest& request)
return result;
}
static UniValue getblockfilter(const JSONRPCRequest& request)
{
if (request.fHelp || request.params.size() < 1 || request.params.size() > 2) {
throw std::runtime_error(
RPCHelpMan{"getblockfilter",
"\nRetrieve a BIP 157 content filter for a particular block.\n",
{
{"blockhash", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hash of the block"},
{"filtertype", RPCArg::Type::STR, /*default*/ "basic", "The type name of the filter"},
},
RPCResult{
"{\n"
" \"filter\" : (string) the hex-encoded filter data\n"
" \"header\" : (string) the hex-encoded filter header\n"
"}\n"
},
RPCExamples{
HelpExampleCli("getblockfilter", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\" \"basic\"")
}
}.ToString()
);
}
uint256 block_hash = ParseHashV(request.params[0], "blockhash");
std::string filtertype_name = "basic";
if (!request.params[1].isNull()) {
filtertype_name = request.params[1].get_str();
}
BlockFilterType filtertype;
if (!BlockFilterTypeByName(filtertype_name, filtertype)) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Unknown filtertype");
}
BlockFilterIndex* index = GetBlockFilterIndex(filtertype);
if (!index) {
throw JSONRPCError(RPC_MISC_ERROR, "Index is not enabled for filtertype " + filtertype_name);
}
const CBlockIndex* block_index;
bool block_was_connected;
{
LOCK(cs_main);
block_index = LookupBlockIndex(block_hash);
if (!block_index) {
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
}
block_was_connected = block_index->IsValid(BLOCK_VALID_SCRIPTS);
}
bool index_ready = index->BlockUntilSyncedToCurrentChain();
BlockFilter filter;
uint256 filter_header;
if (!index->LookupFilter(block_index, filter) ||
!index->LookupFilterHeader(block_index, filter_header)) {
int err_code;
std::string errmsg = "Filter not found.";
if (!block_was_connected) {
err_code = RPC_INVALID_ADDRESS_OR_KEY;
errmsg += " Block was not connected to active chain.";
} else if (!index_ready) {
err_code = RPC_MISC_ERROR;
errmsg += " Block filters are still in the process of being indexed.";
} else {
err_code = RPC_INTERNAL_ERROR;
errmsg += " This error is unexpected and indicates index corruption.";
}
throw JSONRPCError(err_code, errmsg);
}
UniValue ret(UniValue::VOBJ);
ret.pushKV("filter", HexStr(filter.GetEncodedFilter()));
ret.pushKV("header", filter_header.GetHex());
return ret;
}
// clang-format off
static const CRPCCommand commands[] =
{ // category name actor (function) argNames
@@ -2323,6 +2404,7 @@ static const CRPCCommand commands[] =
{ "blockchain", "preciousblock", &preciousblock, {"blockhash"} },
{ "blockchain", "scantxoutset", &scantxoutset, {"action", "scanobjects"} },
{ "blockchain", "getblockfilter", &getblockfilter, {"blockhash", "filtertype"} },
/* Not shown in help */
{ "hidden", "invalidateblock", &invalidateblock, {"blockhash"} },