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module ActionDispatch
# Provide notifications in the middleware stack. Notice that for the before_dispatch
# and after_dispatch notifications, we just send the original env, so we don't pile
# up large env hashes in the queue. However, in exception cases, the whole env hash
# is actually useful, so we send it all.
class Notifications
def initialize(app)
@app = app
end
def call(env)
payload = retrieve_payload_from_env(env)
ActiveSupport::Notifications.instrument("action_dispatch.before_dispatch", payload)
ActiveSupport::Notifications.instrument!("action_dispatch.after_dispatch", payload) do
@app.call(env)
end
rescue Exception => exception
ActiveSupport::Notifications.instrument('action_dispatch.exception',
:env => env, :exception => exception)
raise exception
end
protected
# Remove any rack related constants from the env, like rack.input.
def retrieve_payload_from_env(env)
Hash[:env => env.except(*env.keys.select { |k| k.to_s.index("rack.") == 0 })]
end
end
end
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