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module Gitlab
module Cache
# This module provides a simple way to cache values in RequestStore,
# and the cache key would be based on the class name, method name,
# customized instance level values, and arguments.
#
# A simple example:
#
# class UserAccess
# extend Gitlab::Cache::RequestStoreWrap
#
# request_store_wrap_key do
# [user.id, project.id]
# end
#
# request_store_wrap def can_push_to_branch?(ref)
# # ...
# end
# end
#
# This way, the result of `can_push_to_branch?` would be cached in
# `RequestStore.store` based on the cache key.
module RequestStoreWrap
def self.extended(klass)
return if klass < self
extension = Module.new
klass.const_set(:RequestStoreWrapExtension, extension)
klass.prepend(extension)
end
def request_store_wrap_key(&block)
if block_given?
@request_store_wrap_key = block
else
@request_store_wrap_key
end
end
def request_store_wrap(method_name)
const_get(:RequestStoreWrapExtension)
.send(:define_method, method_name) do |*args|
return super(*args) unless RequestStore.active?
klass = self.class
key = [klass.name,
method_name,
*instance_exec(&klass.request_store_wrap_key),
*args].join(':')
if RequestStore.store.key?(key)
RequestStore.store[key]
else
RequestStore.store[key] = super(*args)
end
end
end
end
end
end
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