Hello all,
My colleagues and I are having issues with our development server hanging
on code changes. There aren't any traceback or errors on why this is
happening, but I suspect it is ActionDispatch::Reloader causing the issue.
In config/environments/development.rb, I add this to see if
ActionDispatch::Reloader could be causing the issue:
class WhatTheHeckMiddleware
def initialize(app, opts = {})
@app = app
@idx = opts[:idx]
end
# Just log when this middleware starts and ends
def call(env)
puts "~~ wth START #{@idx} ~~"
res = @app.call(env)
puts "~~ wth END #{@idx} ~~"
res
end
end
config.middleware.insert_before(ActionDispatch::Reloader,
WhatTheHeckMiddleware, { idx: 1 })
config.middleware.insert_after(ActionDispatch::Reloader,
WhatTheHeckMiddleware, { idx: 2 })
I reproduce the issue by making a code change and then server hangs:
2018-03-22T18:55:57 [I|app|] Started GET "/notification_recipients" for
127.0.0.1 at 2018-03-22 18:55:57 +0000
~~ wth START 1 ~~
(server hangs here, no END statement is printed)
There is a similar issue found in graphql-ruby
<https://github.com/rmosolgo/graphql-ruby/issues/651> that did result in a
commit to rails <https://github.com/rails/rails/pull/31803>. (Their issue
is where I got the debugging idea above) I tried the patch to rails without
luck, It looks like we don’t even use the ActiveSupport::Reloader
middleware mentioned in the issue.
We are using Rails 5.1.4
My questions are:
- Does anyone have any ideas on what could be going on?
- Am I correct in thinking something is going wrong
in ActionDispatch::Reloader?
- How can I debug this further?
Let me know if I can provide any more information.
Thanks!
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