2016-04-08 11:54:52 -04:00
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module Gitlab
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module Metrics
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module Subscribers
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# Class for tracking the total time spent in Rails cache calls
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2016-06-29 11:03:20 -04:00
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# http://guides.rubyonrails.org/active_support_instrumentation.html
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2016-04-08 11:54:52 -04:00
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class RailsCache < ActiveSupport::Subscriber
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attach_to :active_support
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2017-09-05 21:02:08 -04:00
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def self.metric_cache_duration_seconds
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@metric_cache_duration_seconds ||= Gitlab::Metrics.histogram(
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:gitlab_cache_duration_seconds,
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'Cache access time',
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{ action: nil, operation: nil },
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[0.001, 0.002, 0.005, 0.01, 0.02, 0.05, 0.1, 0.500, 2.0, 10.0]
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)
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end
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def self.metric_cache_read_hit_total
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@metric_cache_read_hit_total ||= Gitlab::Metrics.counter(:gitlab_cache_read_hit_total, 'Cache read hit', { action: nil })
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end
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def self.metric_cache_read_miss_total
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@metric_cache_read_miss_total ||= Gitlab::Metrics.counter(:gitlab_cache_read_miss_total, 'Cache read miss', { action: nil })
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end
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2016-04-08 11:54:52 -04:00
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def cache_read(event)
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observe(:read, event.duration)
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return unless current_transaction
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return if event.payload[:super_operation] == :fetch
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if event.payload[:hit]
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self.class.metric_cache_read_hit_total.increment({ action: action })
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current_transaction.increment(:cache_read_hit_count, 1)
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else
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self.class.metric_cache_read_miss_total.increment({ action: action })
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current_transaction.increment(:cache_read_miss_count, 1)
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end
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end
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def cache_write(event)
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observe(:write, event.duration)
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end
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def cache_delete(event)
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observe(:delete, event.duration)
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end
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def cache_exist?(event)
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observe(:exists, event.duration)
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end
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2016-06-29 10:05:57 -04:00
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def cache_fetch_hit(event)
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return unless current_transaction
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self.class.metric_cache_read_hit_total.increment({ action: action })
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current_transaction.increment(:cache_read_hit_count, 1)
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end
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def cache_generate(event)
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return unless current_transaction
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self.class.metric_cache_read_miss_total.increment({ action: action })
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2016-06-29 11:03:20 -04:00
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current_transaction.increment(:cache_read_miss_count, 1)
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end
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def observe(key, duration)
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return unless current_transaction
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2017-09-05 22:36:54 -04:00
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self.class.metric_cache_duration_seconds.observe({ operation: key, action: action }, duration / 1000.0)
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current_transaction.increment(:cache_duration, duration, false)
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current_transaction.increment(:cache_count, 1, false)
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current_transaction.increment("#{key}_duration".to_sym, duration, false)
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current_transaction.increment("#{key}_count".to_sym, 1, false)
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end
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private
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def action
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current_transaction&.action
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end
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2016-04-08 11:54:52 -04:00
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def current_transaction
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Transaction.current
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end
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end
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end
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end
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end
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