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# frozen_string_literal: true
# Interface to the Redis-backed cache store for keys that use a Redis set
module Gitlab
class RepositorySetCache < Gitlab::SetCache
attr_reader :repository, :namespace, :expires_in
def initialize(repository, extra_namespace: nil, expires_in: 2.weeks)
@repository = repository
@namespace = "#{repository.full_path}"
@namespace += ":#{repository.project.id}" if repository.project
@namespace = "#{@namespace}:#{extra_namespace}" if extra_namespace
@expires_in = expires_in
end
def cache_key(type)
super("#{type}:#{namespace}")
end
def write(key, value)
full_key = cache_key(key)
with do |redis|
redis.multi do |multi|
multi.unlink(full_key)
# Splitting into groups of 1000 prevents us from creating a too-long
# Redis command
value.each_slice(1000) { |subset| multi.sadd(full_key, subset) }
multi.expire(full_key, expires_in)
end
end
value
end
def fetch(key, &block)
full_key = cache_key(key)
smembers, exists = with do |redis|
redis.multi do |multi|
multi.smembers(full_key)
multi.exists?(full_key) # rubocop:disable CodeReuse/ActiveRecord
end
end
return smembers if exists
write(key, yield)
end
# Searches the cache set using SSCAN with the MATCH option. The MATCH
# parameter is the pattern argument.
# See https://redis.io/commands/scan#the-match-option for more information.
# Returns an Enumerator that enumerates all SSCAN hits.
def search(key, pattern, &block)
full_key = cache_key(key)
with do |redis|
exists = redis.exists?(full_key) # rubocop:disable CodeReuse/ActiveRecord
write(key, yield) unless exists
redis.sscan_each(full_key, match: pattern)
end
end
end
end
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