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# frozen_string_literal: true
module Gitlab
module QueryLimiting
# Middleware for reporting (or raising) when a request performs more than a
# certain amount of database queries.
class Middleware
CONTROLLER_KEY = 'action_controller.instance'.freeze
ENDPOINT_KEY = 'api.endpoint'.freeze
def initialize(app)
@app = app
end
def call(env)
transaction, retval = Transaction.run do
@app.call(env)
end
transaction.action = action_name(env)
transaction.act_upon_results
retval
end
def action_name(env)
if env[CONTROLLER_KEY]
action_for_rails(env)
elsif env[ENDPOINT_KEY]
action_for_grape(env)
end
end
private
def action_for_rails(env)
controller = env[CONTROLLER_KEY]
action = "#{controller.class.name}##{controller.action_name}"
if controller.content_type == 'text/html'
action
else
"#{action} (#{controller.content_type})"
end
end
def action_for_grape(env)
endpoint = env[ENDPOINT_KEY]
route = endpoint.route rescue nil
"#{route.request_method} #{route.path}" if route
end
end
end
end
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