0547b1646d
* Add Server Timing middleware What is server timing? It's a specification that defines how the server can communicate the user-agent performance metrics about the request it is responding to. Here's the official specification: https://www.w3.org/TR/server-timing/#dfn-server-timing-header-field How does it work? This introduces a new `ServerTiming` middleware only on `development` by default, this is done using the `config.server_timing` setting. It works by subscribing to all `ActiveSupport::Notifications` and adding their duration to the `Server-Timing` header. Why is this useful? It makes looking at performance metrics in development much easier, especially when using Chrome dev tools which includes the metrics in the Network Inspector. Here's an example:  Paired on this with @guilleiguaran
121 lines
3.5 KiB
Ruby
121 lines
3.5 KiB
Ruby
# frozen_string_literal: true
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#--
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# Copyright (c) 2004-2021 David Heinemeier Hansson
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#++
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require "active_support"
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require "active_support/rails"
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require "active_support/core_ext/module/attribute_accessors"
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require "action_pack"
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require "rack"
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module Rack
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autoload :Test, "rack/test"
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end
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module ActionDispatch
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extend ActiveSupport::Autoload
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class IllegalStateError < StandardError
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end
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class MissingController < NameError
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end
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eager_autoload do
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autoload_under "http" do
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autoload :ContentSecurityPolicy
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autoload :PermissionsPolicy
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autoload :Request
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autoload :Response
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end
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end
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autoload_under "middleware" do
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autoload :HostAuthorization
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autoload :RequestId
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autoload :Callbacks
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autoload :Cookies
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autoload :ActionableExceptions
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autoload :DebugExceptions
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autoload :DebugLocks
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autoload :DebugView
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autoload :ExceptionWrapper
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autoload :Executor
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autoload :Flash
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autoload :PublicExceptions
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autoload :Reloader
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autoload :RemoteIp
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autoload :ServerTiming
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autoload :ShowExceptions
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autoload :SSL
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autoload :Static
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end
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autoload :Journey
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autoload :MiddlewareStack, "action_dispatch/middleware/stack"
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autoload :Routing
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module Http
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extend ActiveSupport::Autoload
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autoload :Cache
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autoload :Headers
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autoload :MimeNegotiation
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autoload :Parameters
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autoload :UploadedFile, "action_dispatch/http/upload"
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autoload :URL
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end
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module Session
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autoload :AbstractStore, "action_dispatch/middleware/session/abstract_store"
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autoload :AbstractSecureStore, "action_dispatch/middleware/session/abstract_store"
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autoload :CookieStore, "action_dispatch/middleware/session/cookie_store"
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autoload :MemCacheStore, "action_dispatch/middleware/session/mem_cache_store"
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autoload :CacheStore, "action_dispatch/middleware/session/cache_store"
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end
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mattr_accessor :test_app
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autoload_under "testing" do
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autoload :Assertions
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autoload :Integration
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autoload :IntegrationTest, "action_dispatch/testing/integration"
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autoload :TestProcess
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autoload :TestRequest
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autoload :TestResponse
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autoload :AssertionResponse
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end
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autoload :SystemTestCase, "action_dispatch/system_test_case"
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end
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autoload :Mime, "action_dispatch/http/mime_type"
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ActiveSupport.on_load(:action_view) do
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ActionView::Base.default_formats ||= Mime::SET.symbols
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ActionView::Template::Types.delegate_to Mime
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ActionView::LookupContext::DetailsKey.clear
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end
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