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# frozen_string_literal: true
module Gitlab
class RackTimeoutObserver
def initialize
@counter = Gitlab::Metrics.counter(:rack_state_total, 'Number of requests in a given rack state')
end
# returns the Proc to be used as the observer callback block
def callback
method(:log_timeout_exception)
end
private
def log_timeout_exception(env)
info = env[::Rack::Timeout::ENV_INFO_KEY]
return unless info
@counter.increment(labels(info, env))
end
def labels(info, env)
params = controller_params(env) || grape_params(env) || {}
{
controller: params['controller'],
action: params['action'],
route: params['route'],
state: info.state
}
end
def controller_params(env)
env['action_dispatch.request.parameters']
end
def grape_params(env)
endpoint = env[Grape::Env::API_ENDPOINT]
route = endpoint&.route&.pattern&.origin
return unless route
{ 'route' => route }
end
end
end
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