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module Rack
# Sets an "X-Runtime" response header, indicating the response
# time of the request, in seconds
#
# You can put it right before the application to see the processing
# time, or before all the other middlewares to include time for them,
# too.
class Runtime
def initialize(app, name = nil)
@app = app
@header_name = "X-Runtime"
@header_name << "-#{name}" if name
end
FORMAT_STRING = "%0.6f"
def call(env)
start_time = clock_time
status, headers, body = @app.call(env)
request_time = clock_time - start_time
if !headers.has_key?(@header_name)
headers[@header_name] = FORMAT_STRING % request_time
end
[status, headers, body]
end
private
if defined?(Process::CLOCK_MONOTONIC)
def clock_time
Process.clock_gettime(Process::CLOCK_MONOTONIC)
end
else
def clock_time
Time.now.to_f
end
end
end
end