124 lines
3.8 KiB
Ruby
124 lines
3.8 KiB
Ruby
# frozen_string_literal: true
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# Responsible for returning a dashboard containing specified
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# custom metrics. Creates panels based on the matching metrics
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# stored in the database.
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#
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# Use Gitlab::Metrics::Dashboard::Finder to retrive dashboards.
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module Metrics
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module Dashboard
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class CustomMetricEmbedService < ::Metrics::Dashboard::BaseEmbedService
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extend ::Gitlab::Utils::Override
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include Gitlab::Utils::StrongMemoize
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include Gitlab::Metrics::Dashboard::Defaults
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class << self
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# Determines whether the provided params are sufficient
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# to uniquely identify a panel composed of user-defined
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# custom metrics from the DB.
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def valid_params?(params)
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[
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params[:embedded],
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valid_dashboard?(params[:dashboard_path]),
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valid_group_title?(params[:group]),
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params[:title].present?,
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params.has_key?(:y_label)
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].all?
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end
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private
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# A group title is valid if it is one of the limited
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# options the user can select in the UI.
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def valid_group_title?(group)
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PrometheusMetricEnums
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.custom_group_details
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.map { |_, details| details[:group_title] }
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.include?(group)
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end
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# All custom metrics are displayed on the system dashboard.
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# Nil is acceptable as we'll default to the system dashboard.
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def valid_dashboard?(dashboard)
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dashboard.nil? || SystemDashboardService.system_dashboard?(dashboard)
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end
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end
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# Returns a new dashboard with only the matching
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# metrics from the system dashboard, stripped of
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# group info.
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#
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# Note: This overrides the method #raw_dashboard,
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# which means the result will not be cached. This
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# is because we are inserting DB info into the
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# dashboard before post-processing. This ensures
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# we aren't acting on deleted or out-of-date metrics.
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#
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# @return [Hash]
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override :raw_dashboard
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def raw_dashboard
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panels_not_found!(identifiers) if panels.empty?
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{ 'panel_groups' => [{ 'panels' => panels }] }
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end
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private
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# Generated dashboard panels for each metric which
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# matches the provided input.
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# @return [Array<Hash>]
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def panels
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strong_memoize(:panels) do
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metrics.map { |metric| panel_for_metric(metric) }
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end
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end
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# Metrics which match the provided inputs.
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# There may be multiple metrics, but they should be
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# displayed in a single panel/chart.
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# @return [ActiveRecord::AssociationRelation<PromtheusMetric>]
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# rubocop: disable CodeReuse/ActiveRecord
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def metrics
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project.prometheus_metrics.where(
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group: group_key,
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title: title,
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y_label: y_label
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)
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end
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# rubocop: enable CodeReuse/ActiveRecord
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# Returns a symbol representing the group that
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# the dashboard's group title belongs to.
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# It will be one of the keys found under
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# PrometheusMetricEnums.custom_groups.
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#
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# @return [String]
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def group_key
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strong_memoize(:group_key) do
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PrometheusMetricEnums
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.group_details
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.find { |_, details| details[:group_title] == group }
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.first
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.to_s
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end
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end
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# Returns a representation of a PromtheusMetric
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# as a dashboard panel. As the panel is generated
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# on the fly, we're using default values for info
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# not represented in the DB.
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#
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# @return [Hash]
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def panel_for_metric(metric)
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{
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type: DEFAULT_PANEL_TYPE,
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weight: DEFAULT_PANEL_WEIGHT,
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title: metric.title,
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y_label: metric.y_label,
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metrics: [metric.to_metric_hash]
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}
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end
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end
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end
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end
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