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Merge #12151: rpc: Remove cs_main lock from blockToJSON and blockheaderToJSON

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b9f226b41f rpc: Remove cs_main lock from blockToJSON and blockHeaderToJSON (João Barbosa)
343b98cbcd rpc: Specify chain tip instead of chain in GetDifficulty (João Barbosa)
54dc13b6a2 rpc: Fix SoftForkMajorityDesc and SoftForkDesc signatures (João Barbosa)

Pull request description:

  Motivated by https://github.com/bitcoin/bitcoin/pull/11913#discussion_r157798157, this pull makes `blockToJSON` and `blockheaderToJSON` free of `cs_main` locks.

  Locking `cs_main` was required to access `chainActive` in order to check if the block was in the chain and to retrieve the next block index.

  With the this approach, `CBlockIndex::GetAncestor()` is used in a way to check if the block belongs to the specified chain tip and, at the same time, get the next block index.

Tree-SHA512: a6720ace0182c19033bbed1a404f729d793574db8ab16e0966ffe412145611e32c30aaab02975d225df6d439d7b9ef2070e732b16137a902b0293c8cddfeb85f
pull/643/head
MarcoFalke 6 years ago
parent 5b6b371c77 b9f226b41f
commit f7e182a973
No known key found for this signature in database
GPG Key ID: D2EA4850E7528B25
4 changed files with 37 additions and 48 deletions
Show Stats Download Patch File Download Diff File

17
src/rest.cpp
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@ -136,10 +136,12 @@ static bool rest_headers(HTTPRequest* req,
if (!ParseHashStr(hashStr, hash))
return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
const CBlockIndex* tip = nullptr;
std::vector<const CBlockIndex *> headers;
headers.reserve(count);
{
LOCK(cs_main);
tip = chainActive.Tip();
const CBlockIndex* pindex = LookupBlockIndex(hash);
while (pindex != nullptr && chainActive.Contains(pindex)) {
headers.push_back(pindex);
@ -175,11 +177,8 @@ static bool rest_headers(HTTPRequest* req,
}
case RetFormat::JSON: {
UniValue jsonHeaders(UniValue::VARR);
{
LOCK(cs_main);
for (const CBlockIndex *pindex : headers) {
jsonHeaders.push_back(blockheaderToJSON(pindex));
}
for (const CBlockIndex *pindex : headers) {
jsonHeaders.push_back(blockheaderToJSON(tip, pindex));
}
std::string strJSON = jsonHeaders.write() + "\n";
req->WriteHeader("Content-Type", "application/json");
@ -207,8 +206,10 @@ static bool rest_block(HTTPRequest* req,
CBlock block;
CBlockIndex* pblockindex = nullptr;
CBlockIndex* tip = nullptr;
{
LOCK(cs_main);
tip = chainActive.Tip();
pblockindex = LookupBlockIndex(hash);
if (!pblockindex) {
return RESTERR(req, HTTP_NOT_FOUND, hashStr + " not found");
@ -241,11 +242,7 @@ static bool rest_block(HTTPRequest* req,
}
case RetFormat::JSON: {
UniValue objBlock;
{
LOCK(cs_main);
objBlock = blockToJSON(block, pblockindex, showTxDetails);
}
UniValue objBlock = blockToJSON(block, tip, pblockindex, showTxDetails);
std::string strJSON = objBlock.write() + "\n";
req->WriteHeader("Content-Type", "application/json");
req->WriteReply(HTTP_OK, strJSON);

57
src/rpc/blockchain.cpp
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@ -59,10 +59,7 @@ static CUpdatedBlock latestblock;
*/
double GetDifficulty(const CBlockIndex* blockindex)
{
if (blockindex == nullptr)
{
return 1.0;
}
assert(blockindex);
int nShift = (blockindex->nBits >> 24) & 0xff;
double dDiff =
@ -82,15 +79,22 @@ double GetDifficulty(const CBlockIndex* blockindex)
return dDiff;
}
UniValue blockheaderToJSON(const CBlockIndex* blockindex)
static int ComputeNextBlockAndDepth(const CBlockIndex* tip, const CBlockIndex* blockindex, const CBlockIndex*& next)
{
next = tip->GetAncestor(blockindex->nHeight + 1);
if (next && next->pprev == blockindex) {
return tip->nHeight - blockindex->nHeight + 1;
}
next = nullptr;
return blockindex == tip ? 1 : -1;
}
UniValue blockheaderToJSON(const CBlockIndex* tip, const CBlockIndex* blockindex)
{
AssertLockHeld(cs_main);
UniValue result(UniValue::VOBJ);
result.pushKV("hash", blockindex->GetBlockHash().GetHex());
int confirmations = -1;
// Only report confirmations if the block is on the main chain
if (chainActive.Contains(blockindex))
confirmations = chainActive.Height() - blockindex->nHeight + 1;
const CBlockIndex* pnext;
int confirmations = ComputeNextBlockAndDepth(tip, blockindex, pnext);
result.pushKV("confirmations", confirmations);
result.pushKV("height", blockindex->nHeight);
result.pushKV("version", blockindex->nVersion);
@ -106,21 +110,17 @@ UniValue blockheaderToJSON(const CBlockIndex* blockindex)
if (blockindex->pprev)
result.pushKV("previousblockhash", blockindex->pprev->GetBlockHash().GetHex());
CBlockIndex *pnext = chainActive.Next(blockindex);
if (pnext)
result.pushKV("nextblockhash", pnext->GetBlockHash().GetHex());
return result;
}
UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails)
UniValue blockToJSON(const CBlock& block, const CBlockIndex* tip, const CBlockIndex* blockindex, bool txDetails)
{
AssertLockHeld(cs_main);
UniValue result(UniValue::VOBJ);
result.pushKV("hash", blockindex->GetBlockHash().GetHex());
int confirmations = -1;
// Only report confirmations if the block is on the main chain
if (chainActive.Contains(blockindex))
confirmations = chainActive.Height() - blockindex->nHeight + 1;
const CBlockIndex* pnext;
int confirmations = ComputeNextBlockAndDepth(tip, blockindex, pnext);
result.pushKV("confirmations", confirmations);
result.pushKV("strippedsize", (int)::GetSerializeSize(block, PROTOCOL_VERSION | SERIALIZE_TRANSACTION_NO_WITNESS));
result.pushKV("size", (int)::GetSerializeSize(block, PROTOCOL_VERSION));
@ -152,7 +152,6 @@ UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool tx
if (blockindex->pprev)
result.pushKV("previousblockhash", blockindex->pprev->GetBlockHash().GetHex());
CBlockIndex *pnext = chainActive.Next(blockindex);
if (pnext)
result.pushKV("nextblockhash", pnext->GetBlockHash().GetHex());
return result;
@ -769,7 +768,7 @@ static UniValue getblockheader(const JSONRPCRequest& request)
return strHex;
}
return blockheaderToJSON(pblockindex);
return blockheaderToJSON(chainActive.Tip(), pblockindex);
}
static CBlock GetBlockChecked(const CBlockIndex* pblockindex)
@ -871,7 +870,7 @@ static UniValue getblock(const JSONRPCRequest& request)
return strHex;
}
return blockToJSON(block, pblockindex, verbosity >= 2);
return blockToJSON(block, chainActive.Tip(), pblockindex, verbosity >= 2);
}
struct CCoinsStats
@ -1150,7 +1149,7 @@ static UniValue verifychain(const JSONRPCRequest& request)
}
/** Implementation of IsSuperMajority with better feedback */
static UniValue SoftForkMajorityDesc(int version, CBlockIndex* pindex, const Consensus::Params& consensusParams)
static UniValue SoftForkMajorityDesc(int version, const CBlockIndex* pindex, const Consensus::Params& consensusParams)
{
UniValue rv(UniValue::VOBJ);
bool activated = false;
@ -1170,7 +1169,7 @@ static UniValue SoftForkMajorityDesc(int version, CBlockIndex* pindex, const Con
return rv;
}
static UniValue SoftForkDesc(const std::string &name, int version, CBlockIndex* pindex, const Consensus::Params& consensusParams)
static UniValue SoftForkDesc(const std::string &name, int version, const CBlockIndex* pindex, const Consensus::Params& consensusParams)
{
UniValue rv(UniValue::VOBJ);
rv.pushKV("id", name);
@ -1277,20 +1276,21 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
LOCK(cs_main);
const CBlockIndex* tip = chainActive.Tip();
UniValue obj(UniValue::VOBJ);
obj.pushKV("chain", Params().NetworkIDString());
obj.pushKV("blocks", (int)chainActive.Height());
obj.pushKV("headers", pindexBestHeader ? pindexBestHeader->nHeight : -1);
obj.pushKV("bestblockhash", chainActive.Tip()->GetBlockHash().GetHex());
obj.pushKV("difficulty", (double)GetDifficulty(chainActive.Tip()));
obj.pushKV("mediantime", (int64_t)chainActive.Tip()->GetMedianTimePast());
obj.pushKV("verificationprogress", GuessVerificationProgress(Params().TxData(), chainActive.Tip()));
obj.pushKV("bestblockhash", tip->GetBlockHash().GetHex());
obj.pushKV("difficulty", (double)GetDifficulty(tip));
obj.pushKV("mediantime", (int64_t)tip->GetMedianTimePast());
obj.pushKV("verificationprogress", GuessVerificationProgress(Params().TxData(), tip));
obj.pushKV("initialblockdownload", IsInitialBlockDownload());
obj.pushKV("chainwork", chainActive.Tip()->nChainWork.GetHex());
obj.pushKV("chainwork", tip->nChainWork.GetHex());
obj.pushKV("size_on_disk", CalculateCurrentUsage());
obj.pushKV("pruned", fPruneMode);
if (fPruneMode) {
CBlockIndex* block = chainActive.Tip();
const CBlockIndex* block = tip;
assert(block);
while (block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA)) {
block = block->pprev;
@ -1307,7 +1307,6 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
}
const Consensus::Params& consensusParams = Params().GetConsensus();
CBlockIndex* tip = chainActive.Tip();
UniValue softforks(UniValue::VARR);
UniValue bip9_softforks(UniValue::VOBJ);
softforks.push_back(SoftForkDesc("bip34", 2, tip, consensusParams));

4
src/rpc/blockchain.h
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@ -27,7 +27,7 @@ double GetDifficulty(const CBlockIndex* blockindex);
void RPCNotifyBlockChange(bool ibd, const CBlockIndex *);
/** Block description to JSON */
UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails = false);
UniValue blockToJSON(const CBlock& block, const CBlockIndex* tip, const CBlockIndex* blockindex, bool txDetails = false);
/** Mempool information to JSON */
UniValue mempoolInfoToJSON();
@ -36,7 +36,7 @@ UniValue mempoolInfoToJSON();
UniValue mempoolToJSON(bool fVerbose = false);
/** Block header to JSON */
UniValue blockheaderToJSON(const CBlockIndex* blockindex);
UniValue blockheaderToJSON(const CBlockIndex* tip, const CBlockIndex* blockindex);
/** Used by getblockstats to get feerates at different percentiles by weight */
void CalculatePercentilesByWeight(CAmount result[NUM_GETBLOCKSTATS_PERCENTILES], std::vector<std::pair<CAmount, int64_t>>& scores, int64_t total_weight);

7
src/test/blockchain_tests.cpp
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@ -68,11 +68,4 @@ BOOST_AUTO_TEST_CASE(get_difficulty_for_very_high_target)
TestDifficulty(0x12345678, 5913134931067755359633408.0);
}
// Verify that difficulty is 1.0 for an empty chain.
BOOST_AUTO_TEST_CASE(get_difficulty_for_null_tip)
{
double difficulty = GetDifficulty(nullptr);
RejectDifficultyMismatch(difficulty, 1.0);
}
BOOST_AUTO_TEST_SUITE_END()

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