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Merge pull request #1196 from sipa/fix_948

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Prevent stuck download: correct solution
This commit is contained in:
Gregory Maxwell 2012-05-06 16:58:31 -07:00
commit f49d4f0e93
1 changed files with 14 additions and 2 deletions
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16
src/main.cpp
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@ -2391,6 +2391,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
return error("message inv size() = %d", vInv.size());
}
// find last block in inv vector
unsigned int nLastBlock = (unsigned int)(-1);
for (unsigned int nInv = 0; nInv < vInv.size(); nInv++) {
if (vInv[vInv.size() - 1 - nInv].type == MSG_BLOCK)
nLastBlock = vInv.size() - 1 - nInv;
}
CTxDB txdb("r");
for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
{
@ -2407,9 +2413,15 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
// 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))
if (fAlreadyHave && nInv == nLastBlock) {
// bypass mapAskFor, and send request directly; it must go through.
std::vector<CInv> vGetData(1,inv);
pfrom->PushMessage("getdata", vGetData);
}
if (!fAlreadyHave)
pfrom->AskFor(inv);
if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash))
else if (inv.type == MSG_BLOCK && mapOrphanBlocks.count(inv.hash))
pfrom->PushGetBlocks(pindexBest, GetOrphanRoot(mapOrphanBlocks[inv.hash]));
// Track requests for our stuff