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Contents
module Datadog
module Contrib
module Rack
# QueueTime simply...
module QueueTime
REQUEST_START = 'HTTP_X_REQUEST_START'.freeze
QUEUE_START = 'HTTP_X_QUEUE_START'.freeze
module_function
def get_request_start(env, now = Time.now.utc)
header = env[REQUEST_START] || env[QUEUE_START]
return unless header
# nginx header is in the format "t=1512379167.574"
# TODO: this should be generic enough to work with any
# frontend web server or load balancer
time_string = header.split('t=')[1]
return if time_string.nil?
# return the request_start only if it's lesser than
# current time, to avoid significant clock skew
request_start = Time.at(time_string.to_f)
request_start.utc > now ? nil : request_start
rescue StandardError => e
# in case of an Exception we don't create a
# `request.queuing` span
Datadog::Tracer.log.debug("[rack] unable to parse request queue headers: #{e}")
nil
end
end
end
end
end
Version data entries
21 entries across 21 versions & 1 rubygems