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# frozen_string_literal: true
module Gitlab
module Metrics
module Subscribers
# Class for tracking the total time spent in Rails cache calls
# http://guides.rubyonrails.org/active_support_instrumentation.html
class RailsCache < ActiveSupport::Subscriber
attach_to :active_support
def cache_read(event)
observe(:read, event.duration)
return unless current_transaction
return if event.payload[:super_operation] == :fetch
if event.payload[:hit]
current_transaction.increment(:cache_read_hit_count, 1, false)
else
metric_cache_misses_total.increment(current_transaction.labels)
current_transaction.increment(:cache_read_miss_count, 1, false)
end
end
def cache_write(event)
observe(:write, event.duration)
end
def cache_delete(event)
observe(:delete, event.duration)
end
def cache_exist?(event)
observe(:exists, event.duration)
end
def cache_fetch_hit(event)
return unless current_transaction
current_transaction.increment(:cache_read_hit_count, 1)
end
def cache_generate(event)
return unless current_transaction
metric_cache_misses_total.increment(current_transaction.labels)
current_transaction.increment(:cache_read_miss_count, 1)
end
def observe(key, duration)
return unless current_transaction
metric_cache_operation_duration_seconds.observe(current_transaction.labels.merge({ operation: key }), duration / 1000.0)
current_transaction.increment(:cache_duration, duration, false)
current_transaction.increment(:cache_count, 1, false)
current_transaction.increment("cache_#{key}_duration".to_sym, duration, false)
current_transaction.increment("cache_#{key}_count".to_sym, 1, false)
end
private
def current_transaction
Transaction.current
end
def metric_cache_operation_duration_seconds
@metric_cache_operation_duration_seconds ||= ::Gitlab::Metrics.histogram(
:gitlab_cache_operation_duration_seconds,
'Cache access time',
Transaction::BASE_LABELS.merge({ action: nil }),
[0.001, 0.01, 0.1, 1, 10]
)
end
def metric_cache_misses_total
@metric_cache_misses_total ||= ::Gitlab::Metrics.counter(
:gitlab_cache_misses_total,
'Cache read miss',
Transaction::BASE_LABELS
)
end
end
end
end
end
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