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Use std::string_view in Redis::DoExpire to avoid copies

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This commit is contained in:
Tim Wojtulewicz 2025-04-30 15:14:55 -07:00
parent 50ac8d1468
commit df9b396ee6
1 changed files with 15 additions and 9 deletions
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24
src/storage/backend/redis/Redis.cc
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@ -388,27 +388,33 @@ void Redis::DoExpire(double current_network_time) {
return;
}
std::vector<std::string> elements;
for ( size_t i = 0; i < reply->elements; i++ )
elements.emplace_back(reply->element[i]->str);
std::vector<std::string_view> elements;
elements.reserve(reply->elements);
freeReplyObject(reply);
for ( size_t i = 0; i < reply->elements; i++ )
elements.emplace_back(reply->element[i]->str, reply->element[i]->len);
// TODO: it's possible to pass multiple keys to a DEL operation but it requires
// building an array of the strings, building up the DEL command with entries,
// and passing the array as a block somehow. There's no guarantee it'd be faster
// anyways.
for ( const auto& e : elements ) {
status = redisAsyncCommand(async_ctx, redisGeneric, NULL, "DEL %s:%s", key_prefix.data(), e.c_str());
// redisAsyncCommand usually takes a printf-style string, except the parser used by
// hiredis doesn't handle lengths passed with strings correctly (it hangs indefinitely).
// Use util::fmt here instead it handles it.
status = redisAsyncCommand(async_ctx, redisGeneric, NULL,
util::fmt("DEL %s:%.*s", key_prefix.data(), static_cast<int>(e.size()), e.data()));
++active_ops;
Poll();
redisReply* reply = reply_queue.front();
redisReply* del_reply = reply_queue.front();
reply_queue.pop_front();
freeReplyObject(reply);
freeReplyObject(del_reply);
// TODO: do we care if this failed?
}
freeReplyObject(reply);
// Remove all of the elements from the range-set that match the time range.
redisAsyncCommand(async_ctx, redisGeneric, NULL, "ZREMRANGEBYSCORE %s_expire -inf %f", key_prefix.data(),
current_network_time);
@ -416,9 +422,9 @@ void Redis::DoExpire(double current_network_time) {
++active_ops;
Poll();
reply = reply_queue.front();
redisReply* rem_range_reply = reply_queue.front();
reply_queue.pop_front();
freeReplyObject(reply);
freeReplyObject(rem_range_reply);
// TODO: do we care if this failed?
}