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# frozen_string_literal: true
module Gitlab
module Usage
module Metrics
module Instrumentations
class DatabaseMetric < BaseMetric
# Usage Example
#
# class CountUsersCreatingIssuesMetric < DatabaseMetric
# operation :distinct_count, column: :author_id
#
# relation do |database_time_constraints|
# ::Issue.where(database_time_constraints)
# end
# end
class << self
def start(&block)
@metric_start = block
end
def finish(&block)
@metric_finish = block
end
def relation(&block)
@metric_relation = block
end
def operation(symbol, column: nil)
@metric_operation = symbol
@column = column
end
attr_reader :metric_operation, :metric_relation, :metric_start, :metric_finish, :column
end
def value
method(self.class.metric_operation)
.call(relation,
self.class.column,
start: self.class.metric_start&.call,
finish: self.class.metric_finish&.call)
end
def relation
self.class.metric_relation.call.where(time_constraints)
end
private
def time_constraints
case time_frame
when '28d'
{ created_at: 30.days.ago..2.days.ago }
when 'all'
{}
when 'none'
nil
else
raise "Unknown time frame: #{time_frame} for DatabaseMetric"
end
end
end
end
end
end
end
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