85 lines
2.5 KiB
Ruby
85 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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module PrometheusAdapter
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extend ActiveSupport::Concern
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# We should choose more conservative timeouts, but some queries we run are now busting our
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# default timeouts, which are stricter. We should make those queries faster instead.
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# See https://gitlab.com/gitlab-org/gitlab/-/issues/232786
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DEFAULT_PROMETHEUS_REQUEST_TIMEOUT_SEC = 60.seconds
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included do
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include ReactiveCaching
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self.reactive_cache_lease_timeout = 30.seconds
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self.reactive_cache_refresh_interval = 30.seconds
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self.reactive_cache_lifetime = 1.minute
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self.reactive_cache_work_type = :external_dependency
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def prometheus_client
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raise NotImplementedError
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end
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def prometheus_client_default_options
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{
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timeout: DEFAULT_PROMETHEUS_REQUEST_TIMEOUT_SEC
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}
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end
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# Overridden in app/models/clusters/applications/prometheus.rb
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def managed_prometheus?
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false
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end
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# This is a light-weight check if a prometheus client is properly configured.
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def configured?
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raise NotImplementedError
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end
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# This is a heavy-weight check if a prometheus is properly configured and accessible from GitLab.
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# This actually sends a request to an external service and often it could take a long time,
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# Please consider using `configured?` instead if the process is running on Puma threads.
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def can_query?
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prometheus_client.present?
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end
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def query(query_name, *args)
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return unless can_query?
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query_class = query_klass_for(query_name)
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query_args = build_query_args(*args)
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with_reactive_cache(query_class.name, *query_args, &query_class.method(:transform_reactive_result))
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end
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# Cache metrics for specific environment
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def calculate_reactive_cache(query_class_name, *args)
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return unless prometheus_client
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data = Object.const_get(query_class_name, false).new(prometheus_client).query(*args)
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{
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success: true,
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data: data,
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last_update: Time.current.utc
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}
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rescue Gitlab::PrometheusClient::Error => e
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{ success: false, result: e.message }
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end
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def query_klass_for(query_name)
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Gitlab::Prometheus::Queries.const_get("#{query_name.to_s.classify}Query", false)
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end
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def build_query_args(*args)
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args.map { |arg| arg.respond_to?(:id) ? arg.id : arg }
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end
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def clear_prometheus_reactive_cache!(query_name, *args)
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query_class = query_klass_for(query_name)
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query_args = build_query_args(*args)
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clear_reactive_cache!(query_class.name, *query_args)
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end
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end
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end
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