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require 'active_support/secure_random'
require 'active_support/core_ext/module/delegation'
module ActiveSupport
module Notifications
class Instrumenter
attr_reader :id
def initialize(notifier)
@id = unique_id
@notifier = notifier
end
# Instrument the given block by measuring the time taken to execute it
# and publish it. Notice that events get sent even if an error occurs
# in the passed-in block
def instrument(name, payload={}, info = nil)
begin
started = Time.now
yield
rescue Exception => e
payload[:exception] = [e.class.name, e.message]
raise e
ensure
finished = Time.now
if info
info[:elapsed] = 1000.0 * (finished.to_f - started.to_f)
end
@notifier.publish(name, started, finished, @id, payload)
end
end
private
def unique_id
SecureRandom.hex(10)
end
end
class Event
attr_reader :name, :time, :end, :transaction_id, :payload, :duration
def initialize(name, start, ending, transaction_id, payload)
@name = name
@payload = payload.dup
@time = start
@transaction_id = transaction_id
@end = ending
@duration = 1000.0 * (@end - @time)
end
def parent_of?(event)
start = (time - event.time) * 1000
start <= 0 && (start + duration >= event.duration)
end
end
end
end
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