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Merge pull request #948 from sipa/unstuck

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Prevent stuck block download in large reorganisations
This commit is contained in:
Gavin Andresen 2012-03-21 12:16:28 -07:00
commit b2fe3a5ca6
1 changed files with 8 additions and 3 deletions
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11
src/main.cpp
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@ -2359,8 +2359,10 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
} }
CTxDB txdb("r"); CTxDB txdb("r");
BOOST_FOREACH(const CInv& inv, vInv) for (int nInv = 0; nInv < vInv.size(); nInv++)
{ {
const CInv &inv = vInv[nInv];
if (fShutdown) if (fShutdown)
return true; return true;
pfrom->AddInventoryKnown(inv); pfrom->AddInventoryKnown(inv);
@ -2369,9 +2371,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
if (fDebug) if (fDebug)
printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new"); printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
if (!fAlreadyHave) // Always request the last block in an inv bundle (even if we already have it), as it is the
// trigger for the other side to send further invs. If we are stuck on a (very long) side chain,
// this is necessary to connect earlier received orphan blocks to the chain again.
if (!fAlreadyHave || (inv.type == MSG_BLOCK && nInv==vInv.size()-1))
pfrom->AskFor(inv); pfrom->AskFor(inv);
else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash)) if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash))
pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash])); pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
// Track requests for our stuff // Track requests for our stuff