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# frozen_string_literal: true
module Gitlab
module Analytics
module CycleAnalytics
class RecordsFetcher
include Gitlab::Utils::StrongMemoize
include StageQueryHelpers
include Gitlab::CycleAnalytics::MetricsTables
MAX_RECORDS = 20
MAPPINGS = {
Issue => {
serializer_class: AnalyticsIssueSerializer,
includes_for_query: { project: { namespace: [:route] }, author: [] },
columns_for_select: %I[title iid id created_at author_id project_id]
},
MergeRequest => {
serializer_class: AnalyticsMergeRequestSerializer,
includes_for_query: { target_project: [:namespace], author: [] },
columns_for_select: %I[title iid id created_at author_id state_id target_project_id]
}
}.freeze
delegate :subject_class, to: :stage
def initialize(stage:, query:, params: {})
@stage = stage
@query = query
@params = params
@sort = params[:sort] || :end_event
@direction = params[:direction] || :desc
@page = params[:page] || 1
@per_page = MAX_RECORDS
end
# rubocop: disable CodeReuse/ActiveRecord
def serialized_records
strong_memoize(:serialized_records) do
records = ordered_and_limited_query.select(*columns, *time_columns)
yield records if block_given?
records = preload_associations(records)
records.map do |record|
project = record.project
attributes = record.attributes.merge({
project_path: project.path,
namespace_path: project.namespace.route.path,
author: record.author
})
serializer.represent(attributes)
end
end
end
# rubocop: enable CodeReuse/ActiveRecord
private
attr_reader :stage, :query, :params, :sort, :direction, :page, :per_page
def columns
MAPPINGS.fetch(subject_class).fetch(:columns_for_select).map do |column_name|
subject_class.arel_table[column_name]
end
end
def serializer
MAPPINGS.fetch(subject_class).fetch(:serializer_class).new
end
def ordered_and_limited_query
strong_memoize(:ordered_and_limited_query) do
order_by(query, sort, direction, columns).page(page).per(per_page).without_count
end
end
# rubocop: disable CodeReuse/ActiveRecord
def preload_associations(records)
# using preloader instead of includes to avoid AR generating a large column list
ActiveRecord::Associations::Preloader.new.preload(
records,
MAPPINGS.fetch(subject_class).fetch(:includes_for_query)
)
records
end
# rubocop: enable CodeReuse/ActiveRecord
def time_columns
[
stage.start_event.timestamp_projection.as('start_event_timestamp'),
end_event_timestamp_projection.as('end_event_timestamp'),
round_duration_to_seconds.as('total_time')
]
end
end
end
end
end
Gitlab::Analytics::CycleAnalytics::RecordsFetcher.prepend_mod_with('Gitlab::Analytics::CycleAnalytics::RecordsFetcher')
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