discourse/lib/distributed_memoizer.rb

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# frozen_string_literal: true
class DistributedMemoizer
# never wait for longer that 1 second for a cross process lock
MAX_WAIT = 1
# memoize a key across processes and machines
def self.memoize(key, duration = 60 * 60 * 24, redis = Discourse.redis)
redis_lock_key = self.redis_lock_key(key)
redis_key = self.redis_key(key)
DistributedMutex.synchronize(redis_lock_key, redis: redis, validity: MAX_WAIT) do
result = redis.get(redis_key)
unless result
result = yield
redis.setex(redis_key, duration, result)
end
result
end
end
def self.redis_lock_key(key)
"memoize_lock_#{key}"
end
def self.redis_key(key)
"memoize_#{key}"
end
end