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Rack Middleware for collecting Rails stats on Controller, Action, and Global response times and response code
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# Heavily inspired by: | |
# scout_statsd_rack -- https://github.com/scoutapp/scout_statsd_rack/blob/master/lib/scout_statsd_rack.rb | |
# trashed -- https://github.com/basecamp/trashed | |
# Add to Rails App: `config.middleware.use RackStats` | |
class RackStats | |
attr_accessor :app | |
def initialize(app) | |
@app = app | |
end | |
def call(env) | |
(status, headers, body), response_time = call_with_timing(env) | |
collect_metrics(status, response_time, env['action_controller.instance']) | |
# Rack response | |
[status, headers, body] | |
rescue Exception | |
increment("rack.response_codes.5xx") | |
raise | |
end | |
def collect_metrics(status, response_time, controller) | |
response_code = status.to_s.gsub(/\d{2}$/,'xx') | |
if controller | |
name = controller.controller_name | |
action = controller.action_name | |
format = controller.content_type || :none | |
timing("rack.response.#{name}", response_time) | |
timing("rack.response.#{name}.#{action}", response_time) | |
increment("rack.response_codes.#{name}.#{response_code}") | |
increment("rack.response_codes.#{name}.#{action}.#{response_code}") | |
increment("rack.format.#{format}") | |
end | |
timing("rack.response.all", response_time) | |
increment("rack.response_codes.#{response_code}") | |
rescue Exception => e | |
Airbrake.notify(e) | |
end | |
def call_with_timing(env) | |
start = Time.now | |
result = @app.call(env) | |
[result, ((Time.now - start) * 1000).round] | |
end | |
def increment(key) | |
$statsd.increment("#{key}._t_env.#{Rails.env}") | |
end | |
def timing(key, time) | |
$statsd.timing("#{key}._t_env.#{Rails.env}", time) | |
end | |
end |
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