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Railsで排他制御

Posted at

model以外で特定の処理にロックをかけたい事象が発生したので、その時の対応です。

module Lockable
  extend ActiveSupport::Concern

  class UnableLockError < StandardError; end

  KEY_PREFIX = 'lock/'

  def with_lock(key, expire = 30.seconds)
    real_key = "#{KEY_PREFIX}#{key}"
    value = SecureRandom.hex(10)

    raise UnableLockError unless lock(real_key, value, expire)

    begin
      yield
    ensure
      unlock(real_key, value)
    end
  end

  private

  def lock(key, value, expire)
    redis_client.set(key, value, ex: expire, nx: true)
  end

  def unlock(key, value)
    redis_client.del(key) if $redis.get(key) == value
  end

  def redis_client
    $redis
  end
end
def hoge
  with_lock(key) do
    # somthing
  end
rescue Lockable::UnableLockError
  # handle error
end

redisを用いて対応しました。
もしお困りの方がいらっしゃれば...参考にしてくださいmm

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