80 lines
2.5 KiB
Ruby
80 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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# rubocop:disable Style/ClassVars
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module Gitlab
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module Metrics
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module Methods
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extend ActiveSupport::Concern
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included do
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@@_metric_provider_mutex ||= Mutex.new
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@@_metrics_provider_cache = {}
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end
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class_methods do
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def reload_metric!(name = nil)
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if name.nil?
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@@_metrics_provider_cache = {}
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else
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@@_metrics_provider_cache.delete(name)
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end
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end
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private
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def define_metric(type, name, opts = {}, &block)
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if respond_to?(name)
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raise ArgumentError, "method #{name} already exists"
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end
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define_singleton_method(name) do
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# inlining fetch_metric method to avoid method call overhead when instrumenting hot spots
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@@_metrics_provider_cache[name] || init_metric(type, name, opts, &block)
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end
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end
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def fetch_metric(type, name, opts = {}, &block)
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@@_metrics_provider_cache[name] || init_metric(type, name, opts, &block)
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end
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def init_metric(type, name, opts = {}, &block)
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options = ::Gitlab::Metrics::Methods::MetricOptions.new(opts)
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options.evaluate(&block)
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if disabled_by_feature(options)
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synchronized_cache_fill(name) { ::Gitlab::Metrics::NullMetric.instance }
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else
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synchronized_cache_fill(name) { build_metric!(type, name, options) }
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end
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end
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def synchronized_cache_fill(key)
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@@_metric_provider_mutex.synchronize do
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@@_metrics_provider_cache[key] ||= yield
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end
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end
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def disabled_by_feature(options)
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options.with_feature && !::Feature.enabled?(options.with_feature,
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type: :undefined, default_enabled_if_undefined: false)
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end
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def build_metric!(type, name, options)
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case type
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when :gauge
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::Gitlab::Metrics.gauge(name, options.docstring, options.base_labels, options.multiprocess_mode)
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when :counter
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::Gitlab::Metrics.counter(name, options.docstring, options.base_labels)
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when :histogram
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::Gitlab::Metrics.histogram(name, options.docstring, options.base_labels, options.buckets)
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when :summary
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raise NotImplementedError, "summary metrics are not currently supported"
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else
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raise ArgumentError, "uknown metric type #{type}"
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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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end
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