The problem with io-event update to 1.3.0 about falcon

[ioquatix]

Thanks, I'll investigate.

[skirushkin]

Hi again! I've found the problem in my project Gemfile.
The problem was that gem pry-rails was defined in :default Rails.group and required on application launch.
I've placed it to :test group and now falcon starts correct and respond to routes.
When I tried your repository seems there was an issue with recursive Gemfile load (I've placed your repository inside mine project) that's why simple application did't boot correct (with pry-rails on start).

Thank you so much for you time and sorry for disturb!
I believe that it's not a socketry infrastructure problem. So you can close this issue 🙏

[ioquatix]

@skirushkin thanks for updating the issue. If you are using io-event 1.3 in production, do you mind reporting back if you notice any other issues? Thanks.

[ioquatix]

I have not updated the falcon test suite or tested it on the latest version of io-event so I've done that here: 9170a2a which is running all the tests on ruby 3.2.2 and the latest version of io-event. It appears to be passing, so I'll continue to investigate.

[ioquatix]

I could not reproduce your issue on my Linux dev machine.

Do you mind telling me the version of the Linux kernel you are using?

Also, I tried to make sure we have a consistent reproduction, can you confirm https://github.com/socketry/falcon-my_api is capable of reproducing the issue?

Thanks!

[skirushkin]

Hi, thank you for reply!

Linux kernel version is

backend-falcon-686c874c68-6xql8:/app$ uname -a
Linux backend-falcon-686c874c68-7r9hz 5.4.0-148-generic #165-Ubuntu SMP Tue Apr 18 08:53:12 UTC 2023 x86_64 Linux

backend-falcon-686c874c68-6xql8:/app$ cat /proc/version
Linux version 5.4.0-148-generic (buildd@lcy02-amd64-112) (gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.1)) #165-Ubuntu SMP Tue Apr 18 08:53:12 UTC 2023

backend-falcon-686c874c68-6xql8:/app$ cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.18.3
PRETTY_NAME="Alpine Linux v3.18"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"

It's ruby:3.2.2-alpine docker image.

I've tested your repository and I can confirm that it's consistent reproduction. Falcon starts but doesn't respond to basic curl. Also I can see a warning message on start

backend-falcon-688d5957bc-6xql8:/app/falcon-my_api$ bundle exec falcon host
/app/vendor/bundle/ruby/3.2.0/gems/io-event-1.3.2/lib/io/event/support.rb:24: warning: IO::Buffer is experimental and both the Ruby and C interface may change in the future!
  0.0s     info: Falcon::Command::Host [oid=0x1824] [ec=0x1838] [pid=26] [2023-08-27 13:57:47 +0000]
               | Falcon Host v0.42.3 taking flight!
               | - Configuration: falcon.rb
               | - To terminate: Ctrl-C or kill 26
               | - To reload: kill -HUP 26
 0.04s     info: Falcon::Service::Application [oid=0x184c] [ec=0x1838] [pid=26] [2023-08-27 13:57:47 +0000]
               | Binding to #<Async::HTTP::Endpoint http://0.0.0.0:3000/ {}>...
 0.05s     info: Falcon::Service::Application [oid=0x184c] [ec=0x1874] [pid=27] [2023-08-27 13:57:47 +0000]
               | Starting application server for /app/falcon-my_api...

In parallel shell curl with forever await and it fails once I stop falcon.

backend-falcon-688d5957bc-6xql8:/app$ curl http://0.0.0.0:3000/
curl: (56) Recv failure: Connection reset by peer

[skirushkin]

FYI, we running 150k+ lines of code RoR project with falcon. With high rps.
It's part of microservice infrastructure (so any request to project produce several http or grpc request inside our infrastructure).
It uses Redis (redis-rb) and Postgres (sequel).
Also we implemented your idea about FiberedConnectionPool from async-sequel repository. Code is here https://github.com/umbrellio/umbrellio-sequel-plugins/blob/master/lib/sequel/extensions/fibered_connection_pool.rb

We got blue-green deployment system with k8s. So for us it will be a pleasure to test any new falcon feature for you.
And of course I'll let you know if something goes wrong, thank you for such opportunity!