profunktor.dev/fs2-rabbit

RabbitMQ stream-based client for Scala built on top of Fs2 and Cats Effect -> https://fs2-rabbit.profunktor.dev/

Gavin Bisesi

@Daenyth

or alternately, you could have it on consumer

because that's inside the scope of publisher

Sebastian Voss

@sebastianvoss

the thing is I need to keep the consumer stream running to wait for the response. When I tried to put it there the consumer stream got closed before the response came in.

Gavin Bisesi

@Daenyth

You need the consumer to come before the publisher then

I see

yeah so like consumer -> producer -> Stream.bracket and in the bracket, do your cleanup logic there

Then the closure of both consumer and producer waits for that

but in general I do recommend you rethink the pattern because you can't prevent or handle a kill -9

So have an idea of what cleanup you do when the process for this code just vanishes

Sebastian Voss

@sebastianvoss

OK cool, let me try this. In case the shutdown is not graceful the client will reconnect and continue where it left off. This is only needed for graceful shutdown/logout.

Sebastian Voss

@sebastianvoss

I set automaticRecovery = false. On connection error I'm seeing

WARN  com.rabbitmq.client.impl.ForgivingExceptionHandler - An unexpected connection driver error occured (Exception message: Connection reset)

. As I have to send some messages to the broker after reconnect I would prefer to let the whole app stop and cleanly restart. Is there a way to do that?

Gabriel Volpe

@gvolpe

@bpholt I set up sbt-ci-release so now the publishing to Sonatype is automated. If you want to try out your changes, you can use this SNAPSHOT version: 0.0.0+1-0af65537-SNAPSHOT. I'll make a release in the next few days when I get some time...

Brian P. Holt

@bpholt

Oh, awesome! I'll give that a shot

Brian P. Holt

@bpholt

is there a specific resolver I need to use to pull that in? I haven't tried using published snapshots before

Brian P. Holt

@bpholt

found it:

resolvers += Resolver.sonatypeRepo("snapshots")

Brian P. Holt

@bpholt

Shoot, I forgot to add the new fs2-rabbit-testkit to the aggregated projects in fs2-rabbit-root, so I don't think it was published

Gabriel Volpe

@gvolpe

Huh! Well that's easy to do and when it gets merged into master you will have a SNAPSHOT ready to try out in a few mins

Gavin Bisesi

@Daenyth

Forgetting to aggregate in sbt is the worst :(

I've done that so many times

Brian P. Holt

@bpholt

Oh yeah, I'm more surprised when I remember to do it :joy:

Gavin Bisesi

@Daenyth

I hate that everything looks fine :(

CI just runs, everything green :tada:

because you didn't run the tests for the new module either

Brian P. Holt

@bpholt

🤦‍♂️

I ran them in IntelliJ… at least, I thought I did

yeah everything looks fine to me… the laws all pass and there aren't tests in the testkit module itself

Oh! you're saying typically, when forgetting to aggregate

:joy:

moment of panic passed

Gavin Bisesi

@Daenyth

yup

sorry, I meant the general case :)

Brian P. Holt

@bpholt

no worries :)

Victor Viale

@Koroeskohr

hello! does anyone have any tips to work with fs2-rabbit in a development environment? I just lost 3 hours trying to figure out a weird issue I had before realizing it was some old non-terminated version of the program that was running in the background

Gavin Bisesi

@Daenyth

Local development? I use the rabbit docker container

you might consider using sbt-revolver if you have an app you want to reboot whenever you change code

Victor Viale

@Koroeskohr

ahhhh sbt-revolver that's the thing I forgot about

thank you Gavin!

Victor Viale

@Koroeskohr

as a slightly off topic question, would you recommend RabbitMQ in Action as the book to read on the topic or do you have something else in mind?

Gavin Bisesi

@Daenyth

I haven't read it

I just learned from a live codebase + reading docs and api methods as needed

Gavin Bisesi

@Daenyth

merged the metrics pr

@gvolpe cut a release when you have time?

Gabriel Volpe

@gvolpe

Will do :+1: , thanks. In the meantime, people can try the published snapshot: fs2-rabbit_2.13-0.0.0+1-fa7deae1-SNAPSHOT

Saskia Gennrich

@pektinasen

Hey everyone. Can someone help me to create an SSLContext for TLS without certificate checking?

In python-pika it would be this setting: ssl_options = pika.SSLOptions(context = ssl.SSLContext(ssl.PROTOCOL_TLS))
I just cannot figure it out without supplying certificate stores and whatnot

Gavin Bisesi

@Daenyth

@pektinasen I don't have time right now, but I bet if you google for doing it in java, that's going to be how you do it

assuming we're using the standard SSLContext class

Saskia Gennrich

@pektinasen

I tried that. unfortunately without success

No problem. I'll google some more. I was converting this to scala:https://stackoverflow.com/a/19723687/1041722
but didn't work.

Saskia Gennrich

@pektinasen

seems to be something else. I'm pretty sure I have setup everything correctly now.

Saskia Gennrich

@pektinasen

I'm new to rabbitmq and fs2, so my questions might not directly related to fs2-rabbit, but rabbitmq in general. I'm consuming a queue I have no control over, is there a way to tell the queue I only want events that were generated after I created the connection.
I'm getting events from 2 days ago. Which is when I first started consuming events from this queue.
Sorry, for these basic questions.

Is this even something a consumer has control over?

Gavin Bisesi

@Daenyth

yes, ish

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