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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
This commit is contained in:
MarcoFalke
2019-01-04 12:30:36 +01:00
parent 5b6b371c77 b9f226b41f
commit f7e182a973
4 changed files with 37 additions and 48 deletions
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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));