debian-mirror-gitlab/app/models/concerns/prometheus_adapter.rb

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# frozen_string_literal: true
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module PrometheusAdapter
extend ActiveSupport::Concern
included do
include ReactiveCaching
self.reactive_cache_lease_timeout = 30.seconds
self.reactive_cache_refresh_interval = 30.seconds
self.reactive_cache_lifetime = 1.minute
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self.reactive_cache_work_type = :external_dependency
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def prometheus_client
raise NotImplementedError
end
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# This is a light-weight check if a prometheus client is properly configured.
def configured?
raise NotImplemented
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,
# Please consider using `configured?` instead if the process is running on unicorn/puma threads.
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def can_query?
prometheus_client.present?
end
def query(query_name, *args)
return unless can_query?
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query_class = query_klass_for(query_name)
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
# Cache metrics for specific environment
def calculate_reactive_cache(query_class_name, *args)
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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{
success: true,
data: data,
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last_update: Time.current.utc
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}
rescue Gitlab::PrometheusClient::Error => err
{ success: false, result: err.message }
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
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)
query_class = query_klass_for(query_name)
query_args = build_query_args(*args)
clear_reactive_cache!(query_class.name, *query_args)
end
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end
end