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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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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);