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module Gitlab
module Metrics
# Rack middleware for tracking Rails requests.
class RackMiddleware
CONTROLLER_KEY = 'action_controller.instance'
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) }
# 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)
end
trans.finish
end
retval
end
def transaction_from_env(env)
trans = Transaction.new
trans.set(:request_uri, env['REQUEST_URI'])
trans.set(:request_method, env['REQUEST_METHOD'])
trans
end
def tag_controller(trans, env)
controller = env[CONTROLLER_KEY]
trans.action = "#{controller.class.name}##{controller.action_name}"
end
end
end
end
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