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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)
return @metric_start&.call unless block_given?
@metric_start = block
end
def finish(&block)
return @metric_finish&.call unless block_given?
@metric_finish = block
end
def relation(&block)
return @metric_relation&.call unless block_given?
@metric_relation = block
end
def operation(symbol, column: nil)
@metric_operation = symbol
@column = column
end
def cache_start_and_finish_as(cache_key)
@cache_key = cache_key
end
attr_reader :metric_operation, :metric_relation, :metric_start, :metric_finish, :column, :cache_key
end
def value
start, finish = get_or_cache_batch_ids
method(self.class.metric_operation)
.call(relation,
self.class.column,
start: start,
finish: finish)
end
def to_sql
Gitlab::Usage::Metrics::Query.for(self.class.metric_operation, relation, self.class.column)
end
def suggested_name
Gitlab::Usage::Metrics::NameSuggestion.for(
self.class.metric_operation,
relation: relation,
column: self.class.column
)
end
private
def relation
self.class.metric_relation.call.where(time_constraints)
end
def time_constraints
case time_frame
when '28d'
monthly_time_range_db_params
when 'all'
{}
when 'none'
nil
else
raise "Unknown time frame: #{time_frame} for DatabaseMetric"
end
end
def get_or_cache_batch_ids
return [self.class.start, self.class.finish] unless self.class.cache_key.present?
key_name = "metric_instrumentation/#{self.class.cache_key}"
start = Gitlab::Cache.fetch_once("#{key_name}_minimum_id", expires_in: 1.day) do
self.class.start
end
finish = Gitlab::Cache.fetch_once("#{key_name}_maximum_id", expires_in: 1.day) do
self.class.finish
end
[start, finish]
end
end
end
end
end
end
|
