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Remove empty entries from MsgQueues hashmap 

Before this change, entries in the MsgQueue hashmap would remain once
added, even if their value fell to 0.  This could lead to a very
slight memory leak/increase, because the hashmap would grow each time
a new user connected and would not decrease again.  This is now fixed.
This commit is contained in:
Daniel Sockwell 2020-04-05 17:11:46 -04:00
parent a385434882
commit 357b812f58
1 changed files with 3 additions and 29 deletions
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32
src/redis_to_client_stream/receiver/mod.rs
View File

@ -90,8 +90,9 @@ impl Receiver {
});
use RedisCmd::*;
if *number_of_subscriptions == 0 {
self.redis_connection.send_cmd(Unsubscribe, &tl)?
}
self.redis_connection.send_cmd(Unsubscribe, &tl)?;
self.clients_per_timeline.remove_entry(&tl);
};
Ok(())
}
@ -163,31 +164,4 @@ impl Receiver {
.fold(0, |acc, el| acc.max(el.messages.len()))
)
}
// /// Drop any PubSub subscriptions that don't have active clients and check
// /// that there's a subscription to the current one. If there isn't, then
// /// subscribe to it.
// fn subscribe_or_unsubscribe_as_needed(&mut self, tl: Timeline) -> Result<()> {
// let timelines_to_modify = self.msg_queues.calculate_timelines_to_add_or_drop(tl);
// // Record the lower number of clients subscribed to that channel
// for change in timelines_to_modify {
// let timeline = change.timeline;
// let count_of_subscribed_clients = self
// .clients_per_timeline
// .entry(timeline)
// .and_modify(|n| *n += change.in_subscriber_number)
// .or_insert_with(|| 1);
// // If no clients, unsubscribe from the channel
// use RedisCmd::*;
// if *count_of_subscribed_clients <= 0 {
// self.redis_connection.send_cmd(Unsubscribe, &timeline)?;
// } else if *count_of_subscribed_clients == 1 && change.in_subscriber_number == 1 {
// self.redis_connection.send_cmd(Subscribe, &timeline)?
// }
// }
// Ok(())
// }
}