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chore(server): Fix watch (#3557)

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Vladislav 2024-08-24 13:32:21 +03:00 • committed by GitHub
parent 3fd3c40b74
commit 0e4e971ad9
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3 changed files with 19 additions and 8 deletions
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12
src/server/main_service.cc
View file

@ -2070,8 +2070,8 @@ void Service::Discard(CmdArgList args, ConnectionContext* cntx) {
}
// Return true if non of the connections watched keys expired.
bool CheckWatchedKeyExpiry(ConnectionContext* cntx, const CommandRegistry& registry) {
static char EXISTS[] = "EXISTS";
bool CheckWatchedKeyExpiry(ConnectionContext* cntx, const CommandId* exists_cid,
const CommandId* exec_cid) {
auto& exec_info = cntx->conn_state.exec_info;
CmdArgVec str_list(exec_info.watched_keys.size());
@ -2089,11 +2089,14 @@ bool CheckWatchedKeyExpiry(ConnectionContext* cntx, const CommandRegistry& regis
return OpStatus::OK;
};
cntx->transaction->MultiSwitchCmd(registry.Find(EXISTS));
cntx->transaction->MultiSwitchCmd(exists_cid);
cntx->transaction->InitByArgs(cntx->ns, cntx->conn_state.db_index, CmdArgList{str_list});
OpStatus status = cntx->transaction->ScheduleSingleHop(std::move(cb));
CHECK_EQ(OpStatus::OK, status);
// Reset cid to EXEC as it was before
cntx->transaction->MultiSwitchCmd(exec_cid);
// The comparison can still be true even if a key expired due to another one being created.
// So we have to check the watched_dirty flag, which is set if a key expired.
return watch_exist_count.load() == exec_info.watched_existed &&
@ -2206,7 +2209,8 @@ void Service::Exec(CmdArgList args, ConnectionContext* cntx) {
}
// EXEC should not run if any of the watched keys expired.
if (!exec_info.watched_keys.empty() && !CheckWatchedKeyExpiry(cntx, registry_)) {
if (!exec_info.watched_keys.empty() &&
!CheckWatchedKeyExpiry(cntx, registry_.Find("EXISTS"), exec_cid_)) {
cntx->transaction->UnlockMulti();
return rb->SendNull();
}

11
src/server/multi_test.cc
View file

@ -484,6 +484,14 @@ TEST_F(MultiTest, Watch) {
Run({"multi"});
ASSERT_THAT(Run({"exec"}), kExecFail);
// Check watch with nonempty exec body
EXPECT_EQ(Run({"watch", "a"}), "OK");
Run({"multi"});
Run({"get", "a"});
Run({"get", "b"});
Run({"get", "c"});
ASSERT_THAT(Run({"exec"}), kExecSuccess);
// Check watch data cleared after EXEC.
Run({"set", "a", "1"});
Run({"multi"});
@ -499,10 +507,9 @@ TEST_F(MultiTest, Watch) {
// Check EXEC doesn't miss watched key expiration.
Run({"watch", "a"});
Run({"expire", "a", "1"});
AdvanceTime(1000);
Run({"multi"});
Run({"get", "a"});
ASSERT_THAT(Run({"exec"}), kExecFail);
// Check unwatch.

4
src/server/transaction.cc
View file

@ -506,8 +506,8 @@ void Transaction::MultiUpdateWithParent(const Transaction* parent) {
void Transaction::MultiBecomeSquasher() {
DCHECK(multi_->mode == GLOBAL || multi_->mode == LOCK_AHEAD);
DCHECK_GT(GetUniqueShardCnt(), 0u); // initialized and determined active shards
DCHECK(cid_->IsMultiTransactional()); // proper base command set
DCHECK_GT(GetUniqueShardCnt(), 0u); // initialized and determined active shards
DCHECK(cid_->IsMultiTransactional()) << cid_->name(); // proper base command set
multi_->role = SQUASHER;
}