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fix: allow SELECT in multi/exec if it's a noop (#4146)

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Fixes #4120

Signed-off-by: Roman Gershman <roman@dragonflydb.io>
This commit is contained in:
Roman Gershman 2024-11-18 22:27:34 +02:00 • committed by GitHub
parent e16ef838e4
commit d467a348ac
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GPG key ID: B5690EEEBB952194
5 changed files with 17 additions and 6 deletions
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1
src/server/db_slice.cc
View file

@ -1000,6 +1000,7 @@ bool DbSlice::Acquire(IntentLock::Mode mode, const KeyLockArgs& lock_args) {
if (lock_args.fps.empty()) { // Can be empty for NO_KEY_TRANSACTIONAL commands.
return true;
}
DCHECK_LT(lock_args.db_index, db_array_size());
auto& lt = db_arr_[lock_args.db_index]->trans_locks;
bool lock_acquired = true;

10
src/server/generic_family.cc
View file

@ -1607,6 +1607,16 @@ void GenericFamily::Select(CmdArgList args, Transaction*, SinkReplyBuilder* buil
if (index < 0 || index >= absl::GetFlag(FLAGS_dbnum)) {
return builder->SendError(kDbIndOutOfRangeErr);
}
if (cntx->conn_state.db_index == index) {
// accept a noop.
return builder->SendOk();
}
if (cntx->conn_state.exec_info.IsRunning()) {
return builder->SendError("SELECT is not allowed in a transaction");
}
cntx->conn_state.db_index = index;
auto cb = [ns = cntx->ns, index](EngineShard* shard) {
auto& db_slice = ns->GetDbSlice(shard->shard_id());

4
src/server/journal/executor.cc
View file

@ -76,8 +76,6 @@ void JournalExecutor::Execute(journal::ParsedEntry::CmdData& cmd) {
}
void JournalExecutor::SelectDb(DbIndex dbid) {
conn_context_.conn_state.db_index = dbid;
if (ensured_dbs_.size() <= dbid)
ensured_dbs_.resize(dbid + 1);
@ -85,6 +83,8 @@ void JournalExecutor::SelectDb(DbIndex dbid) {
auto cmd = BuildFromParts("SELECT", dbid);
Execute(cmd);
ensured_dbs_[dbid] = true;
} else {
conn_context_.conn_state.db_index = dbid;
}
}

2
src/server/main_service.cc
View file

@ -1084,7 +1084,7 @@ std::optional<ErrorReply> Service::VerifyCommandState(const CommandId* cid, CmdA
return ErrorReply{"-READONLY You can't write against a read only replica."};
if (multi_active) {
if (cmd_name == "SELECT" || absl::EndsWith(cmd_name, "SUBSCRIBE"))
if (absl::EndsWith(cmd_name, "SUBSCRIBE"))
return ErrorReply{absl::StrCat("Can not call ", cmd_name, " within a transaction")};
if (cmd_name == "WATCH" || cmd_name == "FLUSHALL" || cmd_name == "FLUSHDB")

6
tests/dragonfly/replication_test.py
View file

@ -1067,7 +1067,7 @@ async def assert_replica_reconnections(replica_inst, initial_reconnects_count):
@pytest.mark.asyncio
async def test_replication_info(df_factory: DflyInstanceFactory, df_seeder_factory, n_keys=2000):
master = df_factory.create()
replica = df_factory.create(logtostdout=True, replication_acks_interval=100)
replica = df_factory.create(replication_acks_interval=100)
df_factory.start_all([master, replica])
c_master = master.client()
c_replica = replica.client()
@ -1157,8 +1157,8 @@ redis.call('SET', 'A', 'ErrroR')
@pytest.mark.asyncio
async def test_readonly_script(df_factory):
master = df_factory.create(proactor_threads=2, logtostdout=True)
replica = df_factory.create(proactor_threads=2, logtostdout=True)
master = df_factory.create(proactor_threads=2)
replica = df_factory.create(proactor_threads=2)
df_factory.start_all([master, replica])