uint256 hashSyncCheckpoint;
CSyncCheckpoint checkpointMessage;
CSyncCheckpoint checkpointMessagePending;
+ uint256 hashInvalidCheckpoint = 0;
CCriticalSection cs_hashSyncCheckpoint;
// ppcoin: only descendant of current sync-checkpoint is allowed
CBlockIndex* pindexSyncCheckpoint = mapBlockIndex[hashSyncCheckpoint];
CBlockIndex* pindexCheckpointRecv = mapBlockIndex[hashCheckpoint];
+
if (pindexCheckpointRecv->nHeight <= pindexSyncCheckpoint->nHeight)
- return false; // this is an older checkpoint, ignore
+ {
+ // Received an older checkpoint, trace back from current checkpoint
+ // to the same height of the received checkpoint to verify
+ // that current checkpoint should be a descendant block
+ CBlockIndex* pindex = pindexSyncCheckpoint;
+ while (pindex->nHeight > pindexCheckpointRecv->nHeight)
+ if (!(pindex = pindex->pprev))
+ return error("ValidateSyncCheckpoint: pprev1 null - block index structure failure");
+ if (pindex->GetBlockHash() != hashCheckpoint)
+ {
+ hashInvalidCheckpoint = hashCheckpoint;
+ return error("ValidateSyncCheckpoint: new sync-checkpoint %s is conflicting with current sync-checkpoint %s", hashCheckpoint.ToString().c_str(), hashSyncCheckpoint.ToString().c_str());
+ }
+ return false; // ignore older checkpoint
+ }
+ // Received checkpoint should be a descendant block of the current
+ // checkpoint. Trace back to the same height of current checkpoint
+ // to verify.
CBlockIndex* pindex = pindexCheckpointRecv;
while (pindex->nHeight > pindexSyncCheckpoint->nHeight)
if (!(pindex = pindex->pprev))
- return error("ValidateSyncCheckpoint: pprev null - block index structure failure");
+ return error("ValidateSyncCheckpoint: pprev2 null - block index structure failure");
if (pindex->GetBlockHash() != hashSyncCheckpoint)
+ {
+ hashInvalidCheckpoint = hashCheckpoint;
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()
{
- bool fAccepted = false;
- uint256 hashCheckpoint = 0;
- CTxDB txdb;
-
CRITICAL_BLOCK(cs_hashSyncCheckpoint)
{
if ((!checkpointMessagePending.IsNull()) && mapBlockIndex.count(checkpointMessagePending.hashCheckpoint))
return false;
}
+ CTxDB txdb;
+ CBlockIndex* pindexCheckpoint = mapBlockIndex[checkpointMessagePending.hashCheckpoint];
+ if (!pindexCheckpoint->IsInMainChain())
+ {
+ txdb.TxnBegin();
+ if (!Reorganize(txdb, pindexCheckpoint))
+ {
+ txdb.TxnAbort();
+ hashInvalidCheckpoint = checkpointMessagePending.hashCheckpoint;
+ return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", checkpointMessagePending.hashCheckpoint.ToString().c_str());
+ }
+ }
+
txdb.TxnBegin();
if (!txdb.WriteSyncCheckpoint(checkpointMessagePending.hashCheckpoint))
{
}
if (!txdb.TxnCommit())
return error("AcceptPendingSyncCheckpoint() : failed to commit to db sync checkpoint %s\n", checkpointMessagePending.hashCheckpoint.ToString().c_str());
+ txdb.Close();
hashSyncCheckpoint = checkpointMessagePending.hashCheckpoint;
checkpointMessage = checkpointMessagePending;
checkpointMessagePending.SetNull();
printf("AcceptPendingSyncCheckpoint : sync-checkpoint at %s\n", hashSyncCheckpoint.ToString().c_str());
- fAccepted = true;
- hashCheckpoint = hashSyncCheckpoint;
+ // relay the checkpoint
+ CRITICAL_BLOCK(cs_hashSyncCheckpoint)
+ BOOST_FOREACH(CNode* pnode, vNodes)
+ checkpointMessage.RelayTo(pnode);
+ return true;
}
}
- if (fAccepted)
- {
- CBlockIndex* pindexCheckpoint = mapBlockIndex[hashCheckpoint];
- if (!pindexCheckpoint->IsInMainChain())
- {
- txdb.TxnBegin();
- if (!Reorganize(txdb, pindexCheckpoint))
- {
- txdb.TxnAbort();
- return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
- }
- }
- }
- txdb.Close();
-
- // relay the checkpoint
- CRITICAL_BLOCK(cs_hashSyncCheckpoint)
- BOOST_FOREACH(CNode* pnode, vNodes)
- checkpointMessage.RelayTo(pnode);
-
- return fAccepted;
+ return false;
}
uint256 AutoSelectSyncCheckpoint()
return true;
}
+ bool IsPendingSyncCheckpoint(uint256 hashBlock)
+ {
+ CRITICAL_BLOCK(cs_hashSyncCheckpoint)
+ return ((!checkpointMessagePending.IsNull()) && hashBlock == checkpointMessagePending.hashCheckpoint);
+ }
+
// ppcoin: automatic checkpoint (represented by height of checkpoint)
int nAutoCheckpoint = 0;
int nBranchPoint = 0; // branch point to alternative branch
if (!CheckSignature())
return false;
- CTxDB txdb;
CRITICAL_BLOCK(Checkpoints::cs_hashSyncCheckpoint)
{
if (!mapBlockIndex.count(hashCheckpoint))
{
- // We haven't accepted this block, keep the checkpoint as pending
+ // We haven't received the checkpoint chain, 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);
+ // ask directly as well in case rejected earlier by duplicate
+ // proof-of-stake because getblocks may not get it this time
+ pfrom->AskFor(CInv(MSG_BLOCK, mapOrphanBlocks.count(hashCheckpoint)? GetOrphanRoot(mapOrphanBlocks[hashCheckpoint]) : hashCheckpoint));
+ }
return false;
}
+
if (!Checkpoints::ValidateSyncCheckpoint(hashCheckpoint))
return false;
+ CTxDB txdb;
+ CBlockIndex* pindexCheckpoint = mapBlockIndex[hashCheckpoint];
+ if (!pindexCheckpoint->IsInMainChain())
+ {
+ // checkpoint chain received but not yet main chain
+ txdb.TxnBegin();
+ if (!Reorganize(txdb, pindexCheckpoint))
+ {
+ txdb.TxnAbort();
+ Checkpoints::hashInvalidCheckpoint = hashCheckpoint;
+ return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ }
+ }
+
txdb.TxnBegin();
if (!txdb.WriteSyncCheckpoint(hashCheckpoint))
{
}
if (!txdb.TxnCommit())
return error("ProcessSyncCheckpoint(): failed to commit to db sync checkpoint %s", hashCheckpoint.ToString().c_str());
+ txdb.Close();
Checkpoints::hashSyncCheckpoint = hashCheckpoint;
Checkpoints::checkpointMessage = *this;
Checkpoints::checkpointMessagePending.SetNull();
printf("ProcessSyncCheckpoint: sync-checkpoint at %s\n", hashCheckpoint.ToString().c_str());
}
-
- CBlockIndex* pindexCheckpoint = mapBlockIndex[hashCheckpoint];
- if (!pindexCheckpoint->IsInMainChain())
- {
- txdb.TxnBegin();
- if (!Reorganize(txdb, pindexCheckpoint))
- {
- txdb.TxnAbort();
- return error("ProcessSyncCheckpoint: Reorganize failed for sync checkpoint %s", hashCheckpoint.ToString().c_str());
- }
- }
- txdb.Close();
return true;
}