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wallet: Minimal fix to restore conflicted transaction notifications

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This fix is a based on the fix by Antoine Riard <ariard@student.42.fr> in
https://github.com/bitcoin/bitcoin/pull/18600.

Unlike that PR, which implements some new behavior, this just restores previous
wallet notification and status behavior for transactions removed from the
mempool because they conflict with transactions in a block. The behavior was
accidentally changed in two `CWallet::BlockConnected` updates:
a31be09bfd and
7e89994133 from
https://github.com/bitcoin/bitcoin/pull/16624, causing issue
https://github.com/bitcoin/bitcoin/issues/18325.

The change here could be improved and replaced with a more comprehensive
cleanup, so it includes a detailed comment explaining future considerations.

Fixes #18325

Co-authored-by: Antoine Riard <ariard@student.42.fr>
This commit is contained in:
Russell Yanofsky
2020-05-15 09:23:55 -04:00
parent e2f6866cca
commit b604c5c8b5
9 changed files with 55 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
src/wallet/wallet.cpp
View File

@@ -21,6 +21,7 @@
#include <script/descriptor.h>
#include <script/script.h>
#include <script/signingprovider.h>
#include <txmempool.h>
#include <util/bip32.h>
#include <util/check.h>
#include <util/error.h>
@@ -1111,12 +1112,42 @@ void CWallet::transactionAddedToMempool(const CTransactionRef& ptx) {
}
}
void CWallet::transactionRemovedFromMempool(const CTransactionRef &ptx) {
void CWallet::transactionRemovedFromMempool(const CTransactionRef &ptx, MemPoolRemovalReason reason) {
LOCK(cs_wallet);
auto it = mapWallet.find(ptx->GetHash());
if (it != mapWallet.end()) {
it->second.fInMempool = false;
}
// Handle transactions that were removed from the mempool because they
// conflict with transactions in a newly connected block.
if (reason == MemPoolRemovalReason::CONFLICT) {
// Call SyncNotifications, so external -walletnotify notifications will
// be triggered for these transactions. Set Status::UNCONFIRMED instead
// of Status::CONFLICTED for a few reasons:
//
// 1. The transactionRemovedFromMempool callback does not currently
// provide the conflicting block's hash and height, and for backwards
// compatibility reasons it may not be not safe to store conflicted
// wallet transactions with a null block hash. See
// https://github.com/bitcoin/bitcoin/pull/18600#discussion_r420195993.
// 2. For most of these transactions, the wallet's internal conflict
// detection in the blockConnected handler will subsequently call
// MarkConflicted and update them with CONFLICTED status anyway. This
// applies to any wallet transaction that has inputs spent in the
// block, or that has ancestors in the wallet with inputs spent by
// the block.
// 3. Longstanding behavior since the sync implementation in
// https://github.com/bitcoin/bitcoin/pull/9371 and the prior sync
// implementation before that was to mark these transactions
// unconfirmed rather than conflicted.
//
// Nothing described above should be seen as an unchangeable requirement
// when improving this code in the future. The wallet's heuristics for
// distinguishing between conflicted and unconfirmed transactions are
// imperfect, and could be improved in general, see
// https://github.com/bitcoin-core/bitcoin-devwiki/wiki/Wallet-Transaction-Conflict-Tracking
SyncTransaction(ptx, {CWalletTx::Status::UNCONFIRMED, /* block height */ 0, /* block hash */ {}, /* index */ 0});
}
}
void CWallet::blockConnected(const CBlock& block, int height)
@@ -1129,7 +1160,7 @@ void CWallet::blockConnected(const CBlock& block, int height)
for (size_t index = 0; index < block.vtx.size(); index++) {
CWalletTx::Confirmation confirm(CWalletTx::Status::CONFIRMED, height, block_hash, index);
SyncTransaction(block.vtx[index], confirm);
transactionRemovedFromMempool(block.vtx[index]);
transactionRemovedFromMempool(block.vtx[index], MemPoolRemovalReason::BLOCK);
}
}

2
src/wallet/wallet.h
View File

@@ -923,7 +923,7 @@ public:
uint256 last_failed_block;
};
ScanResult ScanForWalletTransactions(const uint256& start_block, int start_height, Optional<int> max_height, const WalletRescanReserver& reserver, bool fUpdate);
void transactionRemovedFromMempool(const CTransactionRef &ptx) override;
void transactionRemovedFromMempool(const CTransactionRef &ptx, MemPoolRemovalReason reason) override;
void ReacceptWalletTransactions() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
void ResendWalletTransactions();
struct Balance {