forgeplus/app/services/leaky_bucket_rate_limiter.rb

class LeakyBucketRateLimiter
    def initialize(user_id, rate, capacity)
        @rate = rate  # 令牌发放速率（每秒发放的令牌数）
        @capacity = capacity  # 桶的容量（最大令牌数）
        @redis = $redis_cache
        @key = "#{user_id}:LeakyBucket"
        @current_time = Time.now.to_f
    end

    def allow_request
        current_time = Time.now.to_f
        last_drip_time = @redis.getset(@key + ':last_drip_time', current_time).to_f
        tokens = @redis.getset(@key + ':tokens', @capacity).to_i

        # 计算已经漏掉的令牌数量
        leaked_tokens = (current_time - last_drip_time) * @rate
        puts leaked_tokens
        # 如果桶中的令牌多于漏掉的令牌数量，则漏水
        tokens = [@capacity, tokens + leaked_tokens].min
        puts tokens
        if tokens >= 1
            @redis.set(@key + ':last_drip_time', current_time)
            @redis.decr(@key + ':tokens')
            return true
        end
        false
    end
end


=begin 
    失败
    limiter = LeakyBucketRateLimiter.new(110,10, 40)  # 设置令牌发放速率为10，桶的容量为40
    30.times do
        if limiter.allow_request
            puts "Allow"
        else
            puts "Reject"
        end
    end
    
=end