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module Gitlab
module Metrics
# Rack middleware for tracking Rails and Grape requests.
class RackMiddleware
CONTROLLER_KEY = 'action_controller.instance'
ENDPOINT_KEY = 'api.endpoint'
CONTENT_TYPES = {
'text/html' => :html,
'text/plain' => :txt,
'application/json' => :json,
'text/js' => :js,
'application/atom+xml' => :atom,
'image/png' => :png,
'image/jpeg' => :jpeg,
'image/gif' => :gif,
'image/svg+xml' => :svg
}
def initialize(app)
@app = app
end
# env - A Hash containing Rack environment details.
def call(env)
trans = transaction_from_env(env)
retval = nil
begin
retval = trans.run { @app.call(env) }
rescue Exception => error # rubocop: disable Lint/RescueException
trans.add_event(:rails_exception)
raise error
# Even in the event of an error we want to submit any metrics we
# might've gathered up to this point.
ensure
if env[CONTROLLER_KEY]
tag_controller(trans, env)
elsif env[ENDPOINT_KEY]
tag_endpoint(trans, env)
end
trans.finish
end
retval
end
def transaction_from_env(env)
trans = Transaction.new
trans.set(:request_uri, filtered_path(env))
trans.set(:request_method, env['REQUEST_METHOD'])
trans
end
def tag_controller(trans, env)
controller = env[CONTROLLER_KEY]
action = "#{controller.class.name}##{controller.action_name}"
suffix = CONTENT_TYPES[controller.content_type]
if suffix && suffix != :html
action += ".#{suffix}"
end
trans.action = action
end
def tag_endpoint(trans, env)
endpoint = env[ENDPOINT_KEY]
begin
route = endpoint.route
rescue
# endpoint.route is calling env[Grape::Env::GRAPE_ROUTING_ARGS][:route_info]
# but env[Grape::Env::GRAPE_ROUTING_ARGS] is nil in the case of a 405 response
# so we're rescuing exceptions and bailing out
end
if route
path = endpoint_paths_cache[route.request_method][route.path]
trans.action = "Grape##{route.request_method} #{path}"
end
end
private
def filtered_path(env)
ActionDispatch::Request.new(env).filtered_path.presence || env['REQUEST_URI']
end
def endpoint_paths_cache
@endpoint_paths_cache ||= Hash.new do |hash, http_method|
hash[http_method] = Hash.new do |inner_hash, raw_path|
inner_hash[raw_path] = endpoint_instrumentable_path(raw_path)
end
end
end
def endpoint_instrumentable_path(raw_path)
raw_path.sub('(.:format)', '').sub('/:version', '')
end
end
end
end
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