botchini
gen_stage
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botchini
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Show an elixir/phoenix side project?
It was inspired by this Discord bot (which was posted here): https://github.com/lucapasquale/botchini
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What do you like to use for personal full-stack projects?
If I need a bigger backend, or maybe something that is not in JS, I created a machine on AWS free tier and installed CapRover to handle deploys, env vars, SSL for https urls, etc. Works pretty well, and I can use GitHub Actions to deploy automatically after I commit to a branch. (here's an example)
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I've made a simple Discord bot to learn Elixir, and would really like some feedback and tips
Something like this?
gen_stage
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Switching to Elixir
You can actually have "background jobs" in very different ways in Elixir.
> I want background work to live on different compute capacity than http requests, both because they have very different resources usage
In Elixir, because of the way the BEAM works (the unit of parallelism is much cheaper and consume a low amount of memory), "incoming http requests" and related "workers" are not as expensive (a lot less actually) compared to other stacks (for instance Ruby and Python), where it is quite critical to release "http workers" and not hold the connection (which is what lead to the creation of background job tools like Resque, DelayedJob, Sidekiq, Celery...).
This means that you can actually hold incoming HTTP connections a lot longer without troubles.
A consequence of this is that implementing "reverse proxies", or anything calling third party servers _right in the middle_ of your own HTTP call, is usually perfectly acceptable (something I've done more than a couple of times, the latest one powering the reverse proxy behind https://transport.data.gouv.fr - code available at https://github.com/etalab/transport-site/tree/master/apps/un...).
As a consequence, what would be a bad pattern in Python or Ruby (holding the incoming HTTP connection) is not a problem with Elixir.
> because I want to have state or queues in front of background work so there's a well-defined process for retry, error handling, and back-pressure.
Unless you deal with immediate stuff like reverse proxying or cheap "one off async tasks" (like recording a metric), there also are solutions to have more "stateful" background works in Elixir, too.
A popular background job queue is https://github.com/sorentwo/oban (roughly similar to Sidekiq at al), which uses Postgres.
It handles retries, errors etc.
But it's not the only solution, as you have other tools dedicated to processing, such as Broadway (https://github.com/dashbitco/broadway), which handles back-pressure, fault-tolerance, batching etc natively.
You also have more simple options, such as flow (https://github.com/dashbitco/flow), gen_stage (https://github.com/elixir-lang/gen_stage), Task.async_stream (https://hexdocs.pm/elixir/1.12/Task.html#async_stream/5) etc.
It allows to use the "right tool for the job" quite easily.
It is also interesting to note there is no need to "go evented" if you need to fetch data from multiple HTTP servers: it can happen in the exact same process (even: in a background task attached to your HTTP server), as done here https://transport.data.gouv.fr/explore (if you zoom you will see vehicle moving in realtime, and ~80 data sources are being polled every 10 seconds & broadcasted to the visitors via pubsub & websockets).
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I've made a simple Discord bot to learn Elixir, and would really like some feedback and tips
I think if the bot gets a lot of users or streams being tracked you might run into issues with how sync_streams works, you might want to look at something like GenStage or maybe Oban to send messages in batches. In a similar note you'd want to do the same thing for cases where you are doing Repo.all.
What are some alternatives?
png - Elixir library for creating png binaries from multi-dimensional data lists.
transport-site - Rendre disponible, valoriser et améliorer les données transports
guessing-game-discord-bot
eqwalizer - A type-checker for Erlang
wasmcloud-otp - wasmCloud host runtime that leverages Elixir/OTP and Rust to provide simple, secure, distributed application development using the actor model
flow - Computational parallel flows on top of GenStage
bookshelfbot - A Discord bot for querying book information.
rustic_maybe - Maybe monad for Elixir inspired by Rust Option type
alchemy - A discord library for Elixir
broadway - Concurrent and multi-stage data ingestion and data processing with Elixir
metar_map - METAR map visualization driven by a Raspberry Pi and WS281x LEDs
rustic_result - Result monad for Elixir inspired by Rust Result type