* Tweak release profile & micro optimizations
* Replace std HashMap with hashbrown::HashMap
The hashbrown::HashMap is faster than the std::collections::HashMap,
though it does not protect as well against malicious hash collisions
(e.g., in a DDoS). Since we don't expose the hashing externally,
we should switch to the faster implementation.
* Remove use of last_polled_time [WIP]
This commit stops removing subscriptions based on their last polled
time to test the impact of this change on CPU use. This is a WIP
because it does not yet remove subscriptions in any other way, which
(if deployed in production) would cause a memory leak – memory use
would grow with each new subscription and would never be reduced as
clients end their subscriptions.
* Fix bug with RedisConnection polling freqeuency
* Improve performance of EventStream
This commit changes the EventStream so no longer polls client
WebSocket connections to see if it should clean up the connection.
Instead, it cleans up the connection whenever it attempts to send a
ping or a message through the connection and receives an error
indicating that the client has disconnected. As a result, client
connections aren't cleaned up quite as quickly, but overall sys CPU
time should be dramatically improved.
* 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.
* Bump version and remove unused benchmark
* Initial work to support structured errors
* WIP error handling and RedisConn refactor
* WIP for error handling refactor
* Finish substantive work for Redis error handling
* Apply clippy lints
* Prevent Reciever from querying postgres
Before this commit, the Receiver would query Postgres for the name
associated with a hashtag when it encountered one not in its cache.
This ensured that the Receiver never encountered a (valid) hashtag id
that it couldn't handle, but caused a extra DB query and made
independent sections of the code more entangled than they need to be.
Now, we pass the relevant tag name to the Receiver when it first
starts managing a new subscription and it adds the tag name to its
cache then.
* Improve module boundary/privacy
* Reorganize Receiver to cut RedisStream
* Fix tests for code reorganization
Note that this change includes testing some private functionality by
exposing it publicly in tests via conditional compilation. This
doesn't expose that functionality for the benchmarks, so the benchmark
tests do not currently pass without adding a few `pub use`
statements. This might be worth changing later, but benchmark tests
aren't part of our CI and it's not hard to change when we want to test
performance.
This change also cuts the benchmark tests that were benchmarking old
ways Flodgatt functioned. Those were useful for comparison purposes,
but have served their purpose – we've firmly moved away from the
older/slower approach.
* Fix Receiver for tests
Daniel Sockwell