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Hopefully final fix for the stuck blockchain issue

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Immediately issue a "getblocks", instead of a "getdata" (which will
trigger the relevant "inv" to be sent anyway), and only do so when
the previous set of invs led us into a known and attached part of
the block tree.
This commit is contained in:
Pieter Wuille 2012-05-07 21:36:30 +02:00
parent 790fe2e558
commit 385f730f31
1 changed files with 13 additions and 11 deletions
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24
src/main.cpp
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@ -2482,8 +2482,10 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
// 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)
if (vInv[vInv.size() - 1 - nInv].type == MSG_BLOCK) {
nLastBlock = vInv.size() - 1 - nInv;
break;
}
}
CTxDB txdb("r");
for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
@ -2498,19 +2500,19 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
if (fDebug)
printf(" got inventory: %s %s\n", inv.ToString().c_str(), fAlreadyHave ? "have" : "new");
// 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 && 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);
else 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]));
} else if (nInv == nLastBlock) {
// In case we are on a very long side-chain, it is possible that we already have
// the last block in an inv bundle sent in response to getblocks. Try to detect
// this situation and push another getblocks to continue.
std::vector<CInv> vGetData(1,inv);
pfrom->PushGetBlocks(mapBlockIndex[inv.hash], uint256(0));
if (fDebug)
printf("force request: %s\n", inv.ToString().c_str());
}
// Track requests for our stuff
Inventory(inv.hash);