// ppcoin: synchronized checkpoint (centrally broadcasted)
uint256 hashSyncCheckpoint;
+ CSyncCheckpoint checkpointMessage;
+ CSyncCheckpoint checkpointMessagePending;
+ CCriticalSection cs_hashSyncCheckpoint;
- bool AcceptNewSyncCheckpoint(uint256 hashCheckpoint)
+ // ppcoin: only descendant of current sync-checkpoint is allowed
+ bool ValidateSyncCheckpoint(uint256 hashCheckpoint)
{
+ if (!mapBlockIndex.count(hashSyncCheckpoint))
+ return error("ValidateSyncCheckpoint: block index missing for current sync-checkpoint %s", hashSyncCheckpoint.ToString().c_str());
+ if (!mapBlockIndex.count(hashCheckpoint))
+ return error("ValidateSyncCheckpoint: block index missing for received sync-checkpoint %s", hashCheckpoint.ToString().c_str());
+
+ CBlockIndex* pindexSyncCheckpoint = mapBlockIndex[hashSyncCheckpoint];
+ CBlockIndex* pindexCheckpointRecv = mapBlockIndex[hashCheckpoint];
+ if (pindexCheckpointRecv->nHeight <= pindexSyncCheckpoint->nHeight)
+ return false; // this is an older checkpoint, ignore
+
+ CBlockIndex* pindex = pindexCheckpointRecv;
+ while (pindex->nHeight > pindexSyncCheckpoint->nHeight)
+ pindex = pindex->pprev;
+ if (pindex->GetBlockHash() != hashSyncCheckpoint)
+ return error("ValidateSyncCheckpoint: new sync-checkpoint %s is not a descendant of current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
+ return true;
+ }
+
+ bool AcceptPendingSyncCheckpoint(uint256 hashAcceptedBlock)
+ {
+ if (!mapBlockIndex.count(hashAcceptedBlock))
+ return false;
+
+ CRITICAL_BLOCK(cs_hashSyncCheckpoint)
+ if ((!checkpointMessagePending.IsNull()) && checkpointMessagePending.hashCheckpoint == hashAcceptedBlock)
+ {
+ if (!ValidateSyncCheckpoint(checkpointMessagePending.hashCheckpoint))
+ {
+ checkpointMessagePending.SetNull();
+ return false;
+ }
+ hashSyncCheckpoint = checkpointMessagePending.hashCheckpoint;
+ checkpointMessage = checkpointMessagePending;
+ checkpointMessagePending.SetNull();
+ printf("AcceptPendingSyncCheckpoint : sync-checkpoint at %s\n", hashSyncCheckpoint.ToString().c_str());
+ // relay the checkpoint
+ BOOST_FOREACH(CNode* pnode, vNodes)
+ checkpointMessage.RelayTo(pnode);
+ return true;
+ }
+
+ return false;
}
// ppcoin: automatic checkpoint (represented by height of checkpoint)
return true;
}
}
+
+// ppcoin: process synchronized checkpoint
+bool CSyncCheckpoint::ProcessSyncCheckpoint(CNode* pfrom)
+{
+ if (!CheckSignature())
+ return false;
+
+ CRITICAL_BLOCK(Checkpoints::cs_hashSyncCheckpoint)
+ {
+ if (!mapBlockIndex.count(hashCheckpoint))
+ {
+ // We haven't accepted this block, keep the checkpoint as pending
+ Checkpoints::checkpointMessagePending = *this;
+ printf("ProcessSyncCheckpoint : pending for sync-checkpoint %s\n", hashCheckpoint.ToString().c_str());
+ // Ask this guy to fill in what we're missing
+ if (pfrom)
+ pfrom->PushGetBlocks(pindexBest, hashCheckpoint);
+ return false;
+ }
+ if (!Checkpoints::ValidateSyncCheckpoint(hashCheckpoint))
+ return false;
+ Checkpoints::hashSyncCheckpoint = this->hashCheckpoint;
+ Checkpoints::checkpointMessage = *this;
+ Checkpoints::checkpointMessagePending.SetNull();
+ printf("ProcessSyncCheckpoint : sync-checkpoint at %s\n", Checkpoints::hashSyncCheckpoint.ToString().c_str());
+ }
+ return true;
+}