44 lines
1.4 KiB
Ruby
44 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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# This Rack middleware is intended to measure the latency between
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# gitlab-workhorse forwarding a request to the Rails application and the
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# time this middleware is reached.
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module Gitlab
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module Middleware
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class RailsQueueDuration
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GITLAB_RAILS_QUEUE_DURATION_KEY = 'GITLAB_RAILS_QUEUE_DURATION'
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def initialize(app)
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@app = app
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end
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def call(env)
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trans = Gitlab::Metrics.current_transaction
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proxy_start = env['HTTP_GITLAB_WORKHORSE_PROXY_START'].presence
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if trans && proxy_start
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# Time in milliseconds since gitlab-workhorse started the request
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duration = Time.now.to_f * 1_000 - proxy_start.to_f / 1_000_000
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trans.set(:rails_queue_duration, duration)
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duration_s = Gitlab::Utils.ms_to_round_sec(duration)
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metric_rails_queue_duration_seconds.observe(trans.labels, duration_s)
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env[GITLAB_RAILS_QUEUE_DURATION_KEY] = duration_s
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end
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@app.call(env)
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end
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private
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def metric_rails_queue_duration_seconds
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@metric_rails_queue_duration_seconds ||= Gitlab::Metrics.histogram(
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:gitlab_rails_queue_duration_seconds,
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'Measures latency between GitLab Workhorse forwarding a request to Rails',
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Gitlab::Metrics::Transaction::BASE_LABELS
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)
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end
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end
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end
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end
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