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Make sure we always have a node to do IBD from

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This introduces the concept of the 'sync node', which is the one we
asked for missing blocks. In case the sync node goes away, a new one
will be selected.

For now, the heuristic is very simple, but it can easily be extended
later to add better policies.
This commit is contained in:
Pieter Wuille
2013-04-05 00:43:04 +02:00
parent 31dead887d
commit 6ed71b5e4f
3 changed files with 60 additions and 19 deletions
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18
src/main.cpp
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@@ -3235,18 +3235,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
}
}
// Ask the first connected node for block updates
static int nAskedForBlocks = 0;
if (!pfrom->fClient && !pfrom->fOneShot && !fImporting && !fReindex &&
(pfrom->nStartingHeight > (nBestHeight - 144)) &&
(pfrom->nVersion < NOBLKS_VERSION_START ||
pfrom->nVersion >= NOBLKS_VERSION_END) &&
(nAskedForBlocks < 1 || vNodes.size() <= 1))
{
nAskedForBlocks++;
pfrom->PushGetBlocks(pindexBest, uint256(0));
}
// Relay alerts
{
LOCK(cs_mapAlerts);
@@ -3855,6 +3843,12 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
pto->PushMessage("ping");
}
// Start block sync
if (pto->fStartSync && !fImporting && !fReindex) {
pto->fStartSync = false;
pto->PushGetBlocks(pindexBest, uint256(0));
}
// Resend wallet transactions that haven't gotten in a block yet
// Except during reindex, importing and IBD, when old wallet
// transactions become unconfirmed and spams other nodes.