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mempool: add notification for added/removed entries

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Add notification signals to make it possible to subscribe to mempool
changes:

- NotifyEntryAdded(CTransactionRef)>
- NotifyEntryRemoved(CTransactionRef, MemPoolRemovalReason)>

Also add a mempool removal reason enumeration, which is passed to the
removed notification based on why the transaction was removed from
the mempool.
This commit is contained in:
Wladimir J. van der Laan
2016-03-26 16:44:50 +01:00
committed by Alex Morcos
parent 71148b8947
commit ff25c32392
3 changed files with 39 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
src/txmempool.cpp
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@@ -393,6 +393,7 @@ void CTxMemPool::AddTransactionsUpdated(unsigned int n)
bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry, setEntries &setAncestors, bool validFeeEstimate)
{
NotifyEntryAdded(entry.GetSharedTx());
// Add to memory pool without checking anything.
// Used by main.cpp AcceptToMemoryPool(), which DOES do
// all the appropriate checks.
@@ -449,8 +450,9 @@ bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry,
return true;
}
void CTxMemPool::removeUnchecked(txiter it)
void CTxMemPool::removeUnchecked(txiter it, MemPoolRemovalReason reason)
{
NotifyEntryRemoved(it->GetSharedTx(), reason);
const uint256 hash = it->GetTx().GetHash();
BOOST_FOREACH(const CTxIn& txin, it->GetTx().vin)
mapNextTx.erase(txin.prevout);
@@ -502,7 +504,7 @@ void CTxMemPool::CalculateDescendants(txiter entryit, setEntries &setDescendants
}
}
void CTxMemPool::removeRecursive(const CTransaction &origTx)
void CTxMemPool::removeRecursive(const CTransaction &origTx, MemPoolRemovalReason reason)
{
// Remove transaction from memory pool
{
@@ -529,7 +531,8 @@ void CTxMemPool::removeRecursive(const CTransaction &origTx)
BOOST_FOREACH(txiter it, txToRemove) {
CalculateDescendants(it, setAllRemoves);
}
RemoveStaged(setAllRemoves, false);
RemoveStaged(setAllRemoves, false, reason);
}
}
@@ -567,7 +570,7 @@ void CTxMemPool::removeForReorg(const CCoinsViewCache *pcoins, unsigned int nMem
for (txiter it : txToRemove) {
CalculateDescendants(it, setAllRemoves);
}
RemoveStaged(setAllRemoves, false);
RemoveStaged(setAllRemoves, false, MemPoolRemovalReason::REORG);
}
void CTxMemPool::removeConflicts(const CTransaction &tx)
@@ -581,7 +584,7 @@ void CTxMemPool::removeConflicts(const CTransaction &tx)
if (txConflict != tx)
{
ClearPrioritisation(txConflict.GetHash());
removeRecursive(txConflict);
removeRecursive(txConflict, MemPoolRemovalReason::CONFLICT);
}
}
}
@@ -610,7 +613,7 @@ void CTxMemPool::removeForBlock(const std::vector<CTransactionRef>& vtx, unsigne
if (it != mapTx.end()) {
setEntries stage;
stage.insert(it);
RemoveStaged(stage, true);
RemoveStaged(stage, true, MemPoolRemovalReason::BLOCK);
}
removeConflicts(*tx);
ClearPrioritisation(tx->GetHash());
@@ -989,11 +992,11 @@ size_t CTxMemPool::DynamicMemoryUsage() const {
return memusage::MallocUsage(sizeof(CTxMemPoolEntry) + 15 * sizeof(void*)) * mapTx.size() + memusage::DynamicUsage(mapNextTx) + memusage::DynamicUsage(mapDeltas) + memusage::DynamicUsage(mapLinks) + memusage::DynamicUsage(vTxHashes) + cachedInnerUsage;
}
void CTxMemPool::RemoveStaged(setEntries &stage, bool updateDescendants) {
void CTxMemPool::RemoveStaged(setEntries &stage, bool updateDescendants, MemPoolRemovalReason reason) {
AssertLockHeld(cs);
UpdateForRemoveFromMempool(stage, updateDescendants);
BOOST_FOREACH(const txiter& it, stage) {
removeUnchecked(it);
removeUnchecked(it, reason);
}
}
@@ -1009,7 +1012,7 @@ int CTxMemPool::Expire(int64_t time) {
BOOST_FOREACH(txiter removeit, toremove) {
CalculateDescendants(removeit, stage);
}
RemoveStaged(stage, false);
RemoveStaged(stage, false, MemPoolRemovalReason::EXPIRY);
return stage.size();
}
@@ -1118,7 +1121,7 @@ void CTxMemPool::TrimToSize(size_t sizelimit, std::vector<uint256>* pvNoSpendsRe
BOOST_FOREACH(txiter iter, stage)
txn.push_back(iter->GetTx());
}
RemoveStaged(stage, false);
RemoveStaged(stage, false, MemPoolRemovalReason::SIZELIMIT);
if (pvNoSpendsRemaining) {
BOOST_FOREACH(const CTransaction& tx, txn) {
BOOST_FOREACH(const CTxIn& txin, tx.vin) {