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Merge #18982: wallet: Minimal fix to restore conflicted transaction notifications

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7eaf86d3bf trivial: Suggested cleanups to surrounding code (Russell Yanofsky)
b604c5c8b5 wallet: Minimal fix to restore conflicted transaction notifications (Russell Yanofsky)

Pull request description:

  This fix is a based on the fix by Antoine Riard (ariard) 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)

ACKs for top commit:
  jonatack:
    Re-ACK 7eaf86d3bf
  ariard:
    ACK 7eaf86d, reviewed, built and ran tests.
  MarcoFalke:
    ACK 7eaf86d3bf 🍡

Tree-SHA512: 9a1efe975969bb522a9dd73c41064a9348887cb67883cd92c6571fd2df4321b9f4568363891abdaae14a3b9b168ef8142e95c373fc04677e46289b251fb84689
This commit is contained in:
MarcoFalke
2020-06-02 18:11:33 -04:00
parent 5879bfa9a5 7eaf86d3bf
commit 3657aee2d2
9 changed files with 71 additions and 39 deletions
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53
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>
@@ -1100,23 +1101,52 @@ void CWallet::SyncTransaction(const CTransactionRef& ptx, CWalletTx::Confirmatio
MarkInputsDirty(ptx);
}
void CWallet::transactionAddedToMempool(const CTransactionRef& ptx) {
void CWallet::transactionAddedToMempool(const CTransactionRef& tx) {
LOCK(cs_wallet);
CWalletTx::Confirmation confirm(CWalletTx::Status::UNCONFIRMED, /* block_height */ 0, {}, /* nIndex */ 0);
SyncTransaction(ptx, confirm);
SyncTransaction(tx, {CWalletTx::Status::UNCONFIRMED, /* block height */ 0, /* block hash */ {}, /* index */ 0});
auto it = mapWallet.find(ptx->GetHash());
auto it = mapWallet.find(tx->GetHash());
if (it != mapWallet.end()) {
it->second.fInMempool = true;
}
}
void CWallet::transactionRemovedFromMempool(const CTransactionRef &ptx) {
void CWallet::transactionRemovedFromMempool(const CTransactionRef& tx, MemPoolRemovalReason reason) {
LOCK(cs_wallet);
auto it = mapWallet.find(ptx->GetHash());
auto it = mapWallet.find(tx->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(tx, {CWalletTx::Status::UNCONFIRMED, /* block height */ 0, /* block hash */ {}, /* index */ 0});
}
}
void CWallet::blockConnected(const CBlock& block, int height)
@@ -1127,9 +1157,8 @@ void CWallet::blockConnected(const CBlock& block, int height)
m_last_block_processed_height = height;
m_last_block_processed = block_hash;
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]);
SyncTransaction(block.vtx[index], {CWalletTx::Status::CONFIRMED, height, block_hash, (int)index});
transactionRemovedFromMempool(block.vtx[index], MemPoolRemovalReason::BLOCK);
}
}
@@ -1144,8 +1173,7 @@ void CWallet::blockDisconnected(const CBlock& block, int height)
m_last_block_processed_height = height - 1;
m_last_block_processed = block.hashPrevBlock;
for (const CTransactionRef& ptx : block.vtx) {
CWalletTx::Confirmation confirm(CWalletTx::Status::UNCONFIRMED, /* block_height */ 0, {}, /* nIndex */ 0);
SyncTransaction(ptx, confirm);
SyncTransaction(ptx, {CWalletTx::Status::UNCONFIRMED, /* block height */ 0, /* block hash */ {}, /* index */ 0});
}
}
@@ -1685,8 +1713,7 @@ CWallet::ScanResult CWallet::ScanForWalletTransactions(const uint256& start_bloc
break;
}
for (size_t posInBlock = 0; posInBlock < block.vtx.size(); ++posInBlock) {
CWalletTx::Confirmation confirm(CWalletTx::Status::CONFIRMED, block_height, block_hash, posInBlock);
SyncTransaction(block.vtx[posInBlock], confirm, fUpdate);
SyncTransaction(block.vtx[posInBlock], {CWalletTx::Status::CONFIRMED, block_height, block_hash, (int)posInBlock}, fUpdate);
}
// scan succeeded, record block as most recent successfully scanned
result.last_scanned_block = block_hash;

2
src/wallet/wallet.h
View File

@@ -921,7 +921,7 @@ 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& tx, MemPoolRemovalReason reason) override;
void ReacceptWalletTransactions() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
void ResendWalletTransactions();
struct Balance {