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# frozen_string_literal: true
module Projects
module Prometheus
# Find Prometheus alerts by +project+, +environment+, +id+,
# or any combo thereof.
#
# Optionally filter by +metric+.
#
# Arguments:
# params:
# project: Project | integer
# environment: Environment | integer
# metric: PrometheusMetric | integer
class AlertsFinder
def initialize(params = {})
unless params[:project] || params[:environment] || params[:id]
raise ArgumentError,
'Please provide one or more of the following params: :project, :environment, :id'
end
@params = params
end
# Find all matching alerts
#
# @return [ActiveRecord::Relation<PrometheusAlert>]
def execute
relation = by_project(PrometheusAlert)
relation = by_environment(relation)
relation = by_metric(relation)
relation = by_id(relation)
relation = ordered(relation)
relation
end
private
attr_reader :params
def by_project(relation)
return relation unless params[:project]
relation.for_project(params[:project])
end
def by_environment(relation)
return relation unless params[:environment]
relation.for_environment(params[:environment])
end
def by_metric(relation)
return relation unless params[:metric]
relation.for_metric(params[:metric])
end
def by_id(relation)
return relation unless params[:id]
relation.id_in(params[:id])
end
def ordered(relation)
relation.order_by('id_asc')
end
end
end
end
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