errors on production, socket fail

[michelson]

Hi there, I have migrated some months ago to Falcon on rails app,

suddenly I've started to see weird errors which are not being notified on my reporting error, but users noted that some realtime (socket connection) failed.

the logs is like this:

{"time":"2024-10-17T02:38:15+00:00","severity":"warn","oid":3028920,"pid":1,"subject":"Async::Task","annotation":"Reading HTTP/1.1 requests for Async::HTTP::Protocol::HTTP1::Server.","message":["Task may have ended with unhandled exception.","undefined method `write' for nil:NilClass"],"error":{"kind":"NoMethodError","message":"undefined method `write' for nil:NilClass","stack":"/usr/local/bundle/gems/protocol-http1-0.18.0/lib/protocol/http1/connection.rb:134:in `write_response'\n/usr/local/bundle/gems/async-http-0.63.0/lib/async/http/protocol/http1/server.rb:63:in `each'\n/usr/local/bundle/gems/async-http-0.63.0/lib/async/http/server.rb:40:in `accept'\n/usr/local/bundle/gems/async-io-1.41.0/lib/async/io/server.rb:15:in `block in accept_each'\n/usr/local/bundle/gems/async-io-1.41.0/lib/async/io/socket.rb:58:in `block in accept'\n/usr/local/bundle/gems/async-2.8.2/lib/async/task.rb:161:in `block in run'\n/usr/local/bundle/gems/async-2.8.2/lib/async/task.rb:331:in `block in schedule'\n"}}

not sure what could happen here but seems to be async http gems

the installed dependences were:

    async (2.8.2)
      console (~> 1.10)
      fiber-annotation
      io-event (~> 1.1)
      timers (~> 4.1)
    async-container (0.16.13)
      async
      async-io
    async-http (0.63.0)
      async (>= 1.25)
      async-io (>= 1.28)
      async-pool (>= 0.2)
      protocol-http (~> 0.26.0)
      protocol-http1 (~> 0.18.0)
      protocol-http2 (~> 0.16.0)
      traces (>= 0.10.0)
    async-http-cache (0.4.3)
      async-http (~> 0.56)
    async-io (1.41.0)
      async
    async-pool (0.4.0)
      async (>= 1.25)

[ioquatix]

Thanks for your report, I'll investigate it.

Probably a good first step would be to upgrade to the latest version of Ruby, async-http and falcon as well as all the other dependencies.

[michelson]

When I upgraded to the latest Falcon, the Webrick started in development. Maybe I'm missing something

[ioquatix]

@michelson can you show me exactly what command you are running?

[michelson]

HI Samuel, rails s on development.

[ioquatix]

Do you have both puma and falcon in your gemfile.lock?

[michelson]

no, just Falcon on Gemfile. It also happened to me on a new rails app.
steps:

• remove puma
• add falcon
• rails s
  = webrick start.

[ioquatix]

Okay, let me check what's going on.

[ioquatix]

samuel@aiko ~/tmp> rails new foob
      create  
...
         run  bundle install --quiet
samuel@aiko ~/tmp> cd foob
samuel@aiko ~/t/foob (main)> bundle remove puma
Removing gems from /home/samuel/tmp/foob/Gemfile
puma (>= 5.0) was removed.
samuel@aiko ~/t/foob (main)> bundle add falcon
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
Fetching gem metadata from https://rubygems.org/.........
Resolving dependencies...
samuel@aiko ~/t/foob (main)> bin/rails s
=> Booting Falcon v0.48.3
=> Rails 7.2.1.2 application starting in development http://localhost:3000
=> Run `bin/rails server --help` for more startup options

At least with this simple example, I could not reproduce it. Do you mind showing me your output?