gmile
Issue with using "amqp" package after upgrading to OTP26
After upgrading to OTP26, our app that uses amqp package fails to establish a connecting to RabbitMQ server, and I am failing to understand why. Connecting to OTP25 works fine.
# OTP25
AMQP.Connection.open("amqp://guest:guest@amqp-issue-rabbitmq")
{:ok, %AMQP.Connection{pid: #PID<0.241.0>}}
# OTP26
AMQP.Connection.open("amqp://guest:guest@amqp-issue-rabbitmq")
# => {:error, {:auth_failure, 'Disconnected'}}
I have a hunch this must be related to recent changes to SSL-specific defaults in OTP26. However, attempts to disable ssl_options doesn’t work either - it fails with another error, so I must be passing the options in a wrong way. For example, this fails:
AMQP.Connection.open("amqp://guest:guest@amqp-issue-rabbitmq", [ssl_options: :none])
# => {:error, :econnrefused}
Reproduction details
The reproduce script is this one:
# sample.bash
mix do local.hex --force, local.rebar --force
elixir -e 'Mix.install([:amqp]); AMQP.Connection.open("amqp://guest:guest@amqp-issue-rabbitmq") |> IO.inspect()'
The full reproduce experiment is this one:
docker network create amqp-issue
docker run \
--rm \
--name amqp-issue-rabbitmq \
--detach \
--network amqp-issue \
rabbitmq:3.11.16-alpine
sleep 5 # give rabbitmq enough time to fully initialize
docker run \
--rm \
--name amqp-issue-otp25 \
--network amqp-issue \
--mount type=bind,source=$(realpath sample.bash),target=/tmp/sample.bash \
hexpm/elixir:1.14.1-erlang-25.1.2-alpine-3.16.2 \
ash /tmp/sample.bash
docker run \
--rm \
--name amqp-issue-otp25 \
--network amqp-issue \
--mount type=bind,source=$(realpath sample.bash),target=/tmp/sample.bash \
hexpm/elixir:1.14.4-erlang-26.0-alpine-3.18.0 \
ash /tmp/sample.bash
docker stop amqp-issue-rabbitmq
docker network rm amqp-issue
I haven’t dig too deep into amqp_client yet. Any ideas what might be preventing the connection and how to fix it? 
Marked As Solved
After upgrading to Also Liked
cevado
you must probably need to have a version of the server that supports otp26
for reference
al2o3cr
The client implementation and the server share code, according to this note in that second Github issue:
Note that
rabbit_net:port_command/2is not only used by RabbitMQ server, but also by the AMQP 0.9.1 client. Therefore, instead of putting the OTP version (or send function) into persistent_term within the rabbit app, we just do it the first timerabbit_net:port_command/2is invoked.
gmile
Just updating the client worked, yes. I’m using cloudamqp too, and connecting using 3.12 client code appears to work now.
However, I only just did some quick tests. Haven’t deployed this yet.
woylie
In case someone else stumbles upon this thread: The documentation of the amqp library has an example which sets the fail_if_no_peer_cert to true (AMQP.Connection — amqp v3.3.0)). Starting with OTP 26, setting this option on the client side will result in the error {:error, {:option, :server_only, :fail_if_no_peer_cert}}. See Erlang/OTP 26 Highlights - Erlang/OTP.
Popular in Questions
Other popular topics
Latest on Elixir Forum
Sponsor Spotlight
Enabling companies to succeed by building software people love.
Categories:
Sub Categories:
Forums
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Producing high quality Elixir screencasts since 2017.
Enabling companies to succeed by building software people love.
The deployment platform built for Elixir: PaaS ease, VPS control.
Courses that'll move you from confusion to "Aha, now I get it!"