128 lines
3.1 KiB
Ruby
128 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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class PrometheusMetricsFinder
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ACCEPTED_PARAMS = [
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:project,
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:group,
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:title,
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:y_label,
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:identifier,
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:id,
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:common,
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:ordered
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].freeze
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# Cautiously preferring a memoized class method over a constant
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# so that the DB connection is accessed after the class is loaded.
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def self.indexes
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@indexes ||= PrometheusMetric
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.connection
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.indexes(:prometheus_metrics)
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.map { |index| index.columns.map(&:to_sym) }
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end
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def initialize(params = {})
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@params = params.slice(*ACCEPTED_PARAMS)
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end
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# @return [PrometheusMetric, PrometheusMetric::ActiveRecord_Relation]
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def execute
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validate_params!
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metrics = by_project(::PrometheusMetric.all)
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metrics = by_group(metrics)
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metrics = by_title(metrics)
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metrics = by_y_label(metrics)
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metrics = by_common(metrics)
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metrics = by_ordered(metrics)
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metrics = by_identifier(metrics)
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by_id(metrics)
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end
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private
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attr_reader :params
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def by_project(metrics)
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return metrics unless params[:project]
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metrics.for_project(params[:project])
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end
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def by_group(metrics)
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return metrics unless params[:group]
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metrics.for_group(params[:group])
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end
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def by_title(metrics)
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return metrics unless params[:title]
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metrics.for_title(params[:title])
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end
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def by_y_label(metrics)
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return metrics unless params[:y_label]
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metrics.for_y_label(params[:y_label])
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end
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def by_common(metrics)
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return metrics unless params[:common]
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metrics.common
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end
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def by_ordered(metrics)
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return metrics unless params[:ordered]
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metrics.ordered
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end
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def by_identifier(metrics)
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return metrics unless params[:identifier]
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metrics.for_identifier(params[:identifier])
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end
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def by_id(metrics)
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return metrics unless params[:id]
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metrics.id_in(params[:id])
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end
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def validate_params!
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validate_params_present!
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validate_id_params!
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validate_indexes!
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end
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# Ensure all provided params are supported
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def validate_params_present!
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raise ArgumentError, "Please provide one or more of: #{ACCEPTED_PARAMS}" if params.blank?
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end
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# Protect against the caller "finding" the wrong metric
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def validate_id_params!
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raise ArgumentError, 'Only one of :identifier, :id is permitted' if params[:identifier] && params[:id]
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raise ArgumentError, ':identifier must be scoped to a :project or :common' if params[:identifier] && !(params[:project] || params[:common])
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end
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# Protect against unaccounted-for, complex/slow queries.
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# This is not a hard and fast rule, but is meant to encourage
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# mindful inclusion of new queries.
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def validate_indexes!
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indexable_params = params.except(:ordered, :id, :project).keys
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indexable_params << :project_id if params[:project]
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indexable_params.sort!
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raise ArgumentError, "An index should exist for params: #{indexable_params}" unless appropriate_index?(indexable_params)
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end
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def appropriate_index?(indexable_params)
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return true if indexable_params.blank?
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self.class.indexes.any? { |index| (index - indexable_params).empty? }
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end
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end
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