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# frozen_string_literal: true
class SiteStatistic < ActiveRecord::Base
# prevents the creation of multiple rows
default_value_for :id, 1
COUNTER_ATTRIBUTES = %w(repositories_count wikis_count).freeze
REQUIRED_SCHEMA_VERSION = 20180629153018
# Tracks specific attribute
#
# @param [String] raw_attribute must be one of the values listed in COUNTER_ATTRIBUTES
def self.track(raw_attribute)
with_statistics_available(raw_attribute) do |attribute|
SiteStatistic.update_all(["#{attribute} = #{attribute}+1"])
end
end
# Untracks specific attribute
#
# @param [String] raw_attribute must be one of the values listed in COUNTER_ATTRIBUTES
def self.untrack(raw_attribute)
with_statistics_available(raw_attribute) do |attribute|
SiteStatistic.update_all(["#{attribute} = #{attribute}-1 WHERE #{attribute} > 0"])
end
end
# Wrapper for track/untrack operations with basic validations and enforced requirements
#
# @param [String] raw_attribute must be one of the values listed in COUNTER_ATTRIBUTES
# @yield [String] attribute quoted to be used inside SQL / Arel query
def self.with_statistics_available(raw_attribute)
unless raw_attribute.in?(COUNTER_ATTRIBUTES)
raise ArgumentError, "Invalid attribute: '#{raw_attribute}' to '#{caller_locations(1, 1)[0].label}' method. " \
"Valid attributes are: #{COUNTER_ATTRIBUTES.join(', ')}"
end
return unless available?
self.fetch # make sure record exists
attribute = self.connection.quote_column_name(raw_attribute)
# will be running on its own transaction context
yield(attribute)
end
# Returns a site statistic record with tracked information
#
# @return [SiteStatistic] record with tracked information
def self.fetch
SiteStatistic.transaction(requires_new: true) do
SiteStatistic.first_or_create!
end
rescue ActiveRecord::RecordNotUnique
retry
end
# Return whether required schema change is available
#
# This is needed in order to degrade gracefully when testing schema migrations
#
# @return [Boolean] whether schema is available
def self.available?
@available_flag ||= ActiveRecord::Migrator.current_version >= REQUIRED_SCHEMA_VERSION
end
# Resets cached column information
#
# This is called during schema migration specs, in order to reset internal cache state
def self.reset_column_information
@available_flag = nil
super
end
end
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