class ActionDispatch::ServerTiming
Constants
- SERVER_TIMING_HEADER
Public Class Methods
new(app)
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# File lib/action_dispatch/middleware/server_timing.rb, line 9 def initialize(app) @app = app end
Public Instance Methods
call(env)
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# File lib/action_dispatch/middleware/server_timing.rb, line 13 def call(env) events = [] subscriber = ActiveSupport::Notifications.subscribe(/.*/) do |*args| events << ActiveSupport::Notifications::Event.new(*args) end status, headers, body = begin @app.call(env) ensure ActiveSupport::Notifications.unsubscribe(subscriber) end header_info = events.group_by(&:name).map do |event_name, events_collection| "#{event_name};dur=#{events_collection.sum(&:duration)}" end headers[SERVER_TIMING_HEADER] = header_info.join(", ") [ status, headers, body ] end