使用 OkHttp 时是否可以限制带宽?

问题描述

使用 OkHttp 来限制带宽时可以吗?(可能使用网络拦截器).

Is it possible when using OkHttp to throttle the bandwidth? (possibly using a network interceptor).

推荐答案

您可以通过两种方式使其工作:

You can make it work in two ways:

1. 手动发送请求和读取流，并在读取时节流.
2. 添加拦截器.

使用 OkHttp 最好的方法是拦截器.还有几个简单的步骤:

Using OkHttp the best way is Interceptor. There are also a few simple steps:

1. 继承Interceptor接口.
2. 继承 ResponseBody 类.
3. 在自定义 ResponceBody override fun source(): BufferedSource 需要返回 BandwidthSource 的缓冲区.

1. To inherit the Interceptor interface.
2. To inherit the ResponseBody class.
3. In custom ResponceBody override fun source(): BufferedSource needs to return the BandwidthSource's buffer.

带宽源示例:

class BandwidthSource(
    source: Source,
    private val bandwidthLimit: Int
) : ForwardingSource(source) {

    private var time = getSeconds()

    override fun read(sink: Buffer, byteCount: Long): Long {
        val read = super.read(sink, byteCount)
        throttle(read)
        return read
    }

    private fun throttle(byteCount: Long) {
        val bitsCount = byteCount * BITS_IN_BYTE
        val currentTime = getSeconds()
        val timeDiff = currentTime - time
        if (timeDiff == 0L) {
            return
        }
        val kbps = bitsCount / timeDiff
        if (kbps > bandwidthLimit) {
            val times = (kbps / bandwidthLimit)
            if (times > 0) {
                runBlocking { delay(TimeUnit.SECONDS.toMillis(times)) }
            }
        }
        time = currentTime
    }

    private fun getSeconds(): Long {
        return TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis())
    }
}

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