129 lines
4 KiB
Ruby
129 lines
4 KiB
Ruby
# 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)
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@@_metrics_provider_cache.delete(name)
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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 = 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) { 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.get(options.with_feature).enabled?
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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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# Fetch and/or initialize counter metric
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# @param [Symbol] name
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# @param [Hash] opts
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def fetch_counter(name, opts = {}, &block)
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fetch_metric(:counter, name, opts, &block)
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end
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# Fetch and/or initialize gauge metric
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# @param [Symbol] name
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# @param [Hash] opts
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def fetch_gauge(name, opts = {}, &block)
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fetch_metric(:gauge, name, opts, &block)
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end
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# Fetch and/or initialize histogram metric
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# @param [Symbol] name
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# @param [Hash] opts
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def fetch_histogram(name, opts = {}, &block)
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fetch_metric(:histogram, name, opts, &block)
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end
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# Fetch and/or initialize summary metric
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# @param [Symbol] name
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# @param [Hash] opts
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def fetch_summary(name, opts = {}, &block)
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fetch_metric(:summary, name, opts, &block)
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end
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# Define metric accessor method for a Counter
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# @param [Symbol] name
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# @param [Hash] opts
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def define_counter(name, opts = {}, &block)
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define_metric(:counter, name, opts, &block)
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end
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# Define metric accessor method for a Gauge
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# @param [Symbol] name
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# @param [Hash] opts
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def define_gauge(name, opts = {}, &block)
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define_metric(:gauge, name, opts, &block)
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end
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# Define metric accessor method for a Histogram
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# @param [Symbol] name
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# @param [Hash] opts
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def define_histogram(name, opts = {}, &block)
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define_metric(:histogram, name, opts, &block)
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end
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# Define metric accessor method for a Summary
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# @param [Symbol] name
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# @param [Hash] opts
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def define_summary(name, opts = {}, &block)
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define_metric(:summary, name, opts, &block)
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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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