Methods
Constants
SERVER_TIMING_HEADER | = | "Server-Timing" |
Class Public methods
new(app)
Source:
# File actionpack/lib/action_dispatch/middleware/server_timing.rb, line 9
def initialize(app)
@app = app
end
Instance Public methods
call(env)
Source:
# File actionpack/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