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Allow compactblock reconstruction when block is in flight

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This commit is contained in:
Suhas Daftuar 2016-12-14 14:42:04 -05:00
parent b68685a16a
commit 7017298eb2
1 changed files with 45 additions and 0 deletions
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45
src/net_processing.cpp
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@ -1782,6 +1782,11 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
}
}
// Keep a CBlock for "optimistic" compactblock reconstructions (see
// below)
std::shared_ptr<CBlock> pblock = std::make_shared<CBlock>();
bool fBlockReconstructed = false;
LOCK(cs_main);
// If AcceptBlockHeader returned true, it set pindex
assert(pindex);
@ -1870,6 +1875,23 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
req.blockhash = pindex->GetBlockHash();
connman.PushMessage(pfrom, msgMaker.Make(NetMsgType::GETBLOCKTXN, req));
}
} else {
// This block is either already in flight from a different
// peer, or this peer has too many blocks outstanding to
// download from.
// Optimistically try to reconstruct anyway since we might be
// able to without any round trips.
PartiallyDownloadedBlock tempBlock(&mempool);
ReadStatus status = tempBlock.InitData(cmpctblock);
if (status != READ_STATUS_OK) {
// TODO: don't ignore failures
return true;
}
std::vector<CTransactionRef> dummy;
status = tempBlock.FillBlock(*pblock, dummy);
if (status == READ_STATUS_OK) {
fBlockReconstructed = true;
}
}
} else {
if (fAlreadyInFlight) {
@ -1889,6 +1911,29 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
return ProcessMessage(pfrom, NetMsgType::HEADERS, vHeadersMsg, nTimeReceived, chainparams, connman);
}
}
if (fBlockReconstructed) {
// If we got here, we were able to optimistically reconstruct a
// block that is in flight from some other peer.
{
LOCK(cs_main);
mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom->GetId(), false));
}
bool fNewBlock = false;
ProcessNewBlock(chainparams, pblock, true, &fNewBlock);
if (fNewBlock)
pfrom->nLastBlockTime = GetTime();
LOCK(cs_main); // hold cs_main for CBlockIndex::IsValid()
if (pindex->IsValid(BLOCK_VALID_TRANSACTIONS)) {
// Clear download state for this block, which is in
// process from some other peer. We do this after calling
// ProcessNewBlock so that a malleated cmpctblock announcement
// can't be used to interfere with block relay.
MarkBlockAsReceived(pblock->GetHash());
}
}
}
else if (strCommand == NetMsgType::BLOCKTXN && !fImporting && !fReindex) // Ignore blocks received while importing