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<main>
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<h1 id="stream"><a class="header" href="#stream">Stream</a></h1>
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<p>大家有没有想过， Rust 中的迭代器在迭代时能否异步进行？若不可以，是不是有相应的解决方案？</p>
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<p>以上的问题其实很重要，因为在实际场景中，迭代一个集合，然后异步的去执行是很常见的需求，好在 Tokio 为我们提供了 <code>stream</code>，我们可以在异步函数中对其进行迭代，甚至和迭代器 <code>Iterator</code> 一样，<code>stream</code> 还能使用适配器，例如 <code>map</code> ! Tokio 在 <a href="https://docs.rs/tokio-stream/0.1.8/tokio_stream/trait.StreamExt.html"><code>StreamExt</code></a> 特征上定义了常用的适配器。</p>
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<p>要使用 <code>stream</code> ，目前还需要手动引入对应的包：</p>
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<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
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</span><span class="boring">fn main() {
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</span>tokio-stream = "0.1"
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<span class="boring">}</span></code></pre>
|
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<blockquote>
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<p>stream 没有放在 <code>tokio</code> 包的原因在于标准库中的 <code>Stream</code> 特征还没有稳定，一旦稳定后，<code>stream</code> 将移动到 <code>tokio</code> 中来</p>
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</blockquote>
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<h2 id="迭代"><a class="header" href="#迭代">迭代</a></h2>
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<p>目前， Rust 语言还不支持异步的 <code>for</code> 循环，因此我们需要 <code>while let</code> 循环和 <a href="https://docs.rs/tokio-stream/0.1.8/tokio_stream/trait.StreamExt.html#method.next"><code>StreamExt::next()</code></a> 一起使用来实现迭代的目的:</p>
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<pre class="playground"><code class="language-rust edition2021">use tokio_stream::StreamExt;
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#[tokio::main]
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|
|
async fn main() {
|
|
|
let mut stream = tokio_stream::iter(&[1, 2, 3]);
|
|
|
|
|
|
while let Some(v) = stream.next().await {
|
|
|
println!("GOT = {:?}", v);
|
|
|
}
|
|
|
}</code></pre>
|
|
|
<p>和迭代器 <code>Iterator</code> 类似，<code>next()</code> 方法返回一个 <code>Option<T></code>，其中 <code>T</code> 是从 <code>stream</code> 中获取的值的类型。若收到 <code>None</code> 则意味着 <code>stream</code> 迭代已经结束。</p>
|
|
|
<h4 id="mini-redis-广播"><a class="header" href="#mini-redis-广播">mini-redis 广播</a></h4>
|
|
|
<p>下面我们来实现一个复杂一些的 mini-redis 客户端，完整代码见<a href="https://github.com/tokio-rs/website/blob/master/tutorial-code/streams/src/main.rs">这里</a>。</p>
|
|
|
<p>在开始之前，首先启动一下完整的 mini-redis 服务器端：</p>
|
|
|
<pre><code class="language-console">$ mini-redis-server
|
|
|
</code></pre>
|
|
|
<pre class="playground"><code class="language-rust edition2021">use tokio_stream::StreamExt;
|
|
|
use mini_redis::client;
|
|
|
|
|
|
async fn publish() -> mini_redis::Result<()> {
|
|
|
let mut client = client::connect("127.0.0.1:6379").await?;
|
|
|
|
|
|
// 发布一些数据
|
|
|
client.publish("numbers", "1".into()).await?;
|
|
|
client.publish("numbers", "two".into()).await?;
|
|
|
client.publish("numbers", "3".into()).await?;
|
|
|
client.publish("numbers", "four".into()).await?;
|
|
|
client.publish("numbers", "five".into()).await?;
|
|
|
client.publish("numbers", "6".into()).await?;
|
|
|
Ok(())
|
|
|
}
|
|
|
|
|
|
async fn subscribe() -> mini_redis::Result<()> {
|
|
|
let client = client::connect("127.0.0.1:6379").await?;
|
|
|
let subscriber = client.subscribe(vec!["numbers".to_string()]).await?;
|
|
|
let messages = subscriber.into_stream();
|
|
|
|
|
|
tokio::pin!(messages);
|
|
|
|
|
|
while let Some(msg) = messages.next().await {
|
|
|
println!("got = {:?}", msg);
|
|
|
}
|
|
|
|
|
|
Ok(())
|
|
|
}
|
|
|
|
|
|
#[tokio::main]
|
|
|
async fn main() -> mini_redis::Result<()> {
|
|
|
tokio::spawn(async {
|
|
|
publish().await
|
|
|
});
|
|
|
|
|
|
subscribe().await?;
|
|
|
|
|
|
println!("DONE");
|
|
|
|
|
|
Ok(())
|
|
|
}</code></pre>
|
|
|
<p>上面生成了一个异步任务专门用于发布消息到 min-redis 服务器端的 <code>numbers</code> 消息通道中。然后，在 <code>main</code> 中，我们订阅了 <code>numbers</code> 消息通道，并且打印从中接收到的消息。</p>
|
|
|
<p>还有几点值得注意的:</p>
|
|
|
<ul>
|
|
|
<li><a href="https://docs.rs/mini-redis/0.4.1/mini_redis/client/struct.Subscriber.html#method.into_stream"><code>into_stream</code></a> 会将 <code>Subscriber</code> 变成一个 <code>stream</code></li>
|
|
|
<li>在 <code>stream</code> 上调用 <code>next</code> 方法要求该 <code>stream</code> 被固定住(<a href="https://doc.rust-lang.org/std/pin/index.html"><code>pinned</code></a>)，因此需要调用 <code>tokio::pin!</code></li>
|
|
|
</ul>
|
|
|
<blockquote>
|
|
|
<p>关于 Pin 的详细解读，可以阅读<a href="https://course.rs/async/pin-unpin.html">这篇文章</a></p>
|
|
|
</blockquote>
|
|
|
<p>大家可以去掉 <code>pin!</code> 的调用，然后观察下报错，若以后你遇到这种错误，可以尝试使用下 <code>pin!</code>。</p>
|
|
|
<p>此时，可以运行下我们的客户端代码看看效果(别忘了先启动前面提到的 mini-redis 服务端):</p>
|
|
|
<pre><code class="language-console">got = Ok(Message { channel: "numbers", content: b"1" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"two" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"3" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"four" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"five" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"6" })
|
|
|
</code></pre>
|
|
|
<p>在了解了 <code>stream</code> 的基本用法后，我们再来看看如何使用适配器来扩展它。</p>
|
|
|
<h2 id="适配器"><a class="header" href="#适配器">适配器</a></h2>
|
|
|
<p>在前面章节中，我们了解了迭代器有<a href="https://course.rs/advance/functional-programing/iterator.html#消费者与适配器">两种适配器</a>：</p>
|
|
|
<ul>
|
|
|
<li>迭代器适配器，会将一个迭代器转变成另一个迭代器，例如 <code>map</code>，<code>filter</code> 等</li>
|
|
|
<li>消费者适配器，会消费掉一个迭代器，最终生成一个值，例如 <code>collect</code> 可以将迭代器收集成一个集合</li>
|
|
|
</ul>
|
|
|
<p>与迭代器类似，<code>stream</code> 也有适配器，例如一个 <code>stream</code> 适配器可以将一个 <code>stream</code> 转变成另一个 <code>stream</code> ，例如 <code>map</code>、<code>take</code> 和 <code>filter</code>。</p>
|
|
|
<p>在之前的客户端中，<code>subscribe</code> 订阅一直持续下去，直到程序被关闭。现在，让我们来升级下，让它在收到三条消息后就停止迭代，最终结束。</p>
|
|
|
<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>let messages = subscriber
|
|
|
.into_stream()
|
|
|
.take(3);
|
|
|
<span class="boring">}</span></code></pre>
|
|
|
<p>这里关键就在于 <code>take</code> 适配器，它会限制 <code>stream</code> 只能生成最多 <code>n</code> 条消息。运行下看看结果：</p>
|
|
|
<pre><code class="language-console">got = Ok(Message { channel: "numbers", content: b"1" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"two" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"3" })
|
|
|
</code></pre>
|
|
|
<p>程序终于可以正常结束了。现在，让我们过滤 <code>stream</code> 中的消息，只保留数字类型的值:</p>
|
|
|
<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>let messages = subscriber
|
|
|
.into_stream()
|
|
|
.filter(|msg| match msg {
|
|
|
Ok(msg) if msg.content.len() == 1 => true,
|
|
|
_ => false,
|
|
|
})
|
|
|
.take(3);
|
|
|
<span class="boring">}</span></code></pre>
|
|
|
<p>运行后输出：</p>
|
|
|
<pre><code class="language-console">got = Ok(Message { channel: "numbers", content: b"1" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"3" })
|
|
|
got = Ok(Message { channel: "numbers", content: b"6" })
|
|
|
</code></pre>
|
|
|
<p>需要注意的是，适配器的顺序非常重要，<code>.filter(...).take(3)</code> 和 <code>.take(3).filter(...)</code> 的结果可能大相径庭，大家可以自己尝试下。</p>
|
|
|
<p>现在，还有一件事要做，咱们的消息被不太好看的 <code>Ok(...)</code> 所包裹，现在通过 <code>map</code> 适配器来简化下:</p>
|
|
|
<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>let messages = subscriber
|
|
|
.into_stream()
|
|
|
.filter(|msg| match msg {
|
|
|
Ok(msg) if msg.content.len() == 1 => true,
|
|
|
_ => false,
|
|
|
})
|
|
|
.map(|msg| msg.unwrap().content)
|
|
|
.take(3);
|
|
|
<span class="boring">}</span></code></pre>
|
|
|
<p>注意到 <code>msg.unwrap</code> 了吗？大家可能会以为我们是出于示例的目的才这么用，实际上并不是，由于 <code>filter</code> 的先执行， <code>map</code> 中的 <code>msg</code> 只能是 <code>Ok(...)</code>，因此 <code>unwrap</code> 非常安全。</p>
|
|
|
<pre><code class="language-console">got = b"1"
|
|
|
got = b"3"
|
|
|
got = b"6"
|
|
|
</code></pre>
|
|
|
<p>还有一点可以改进的地方：当 <code>filter</code> 和 <code>map</code> 一起使用时，你往往可以用一个统一的方法来实现 <a href="https://docs.rs/tokio-stream/0.1.8/tokio_stream/trait.StreamExt.html#method.filter_map"><code>filter_map</code></a>。</p>
|
|
|
<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>let messages = subscriber
|
|
|
.into_stream()
|
|
|
.filter_map(|msg| match msg {
|
|
|
Ok(msg) if msg.content.len() == 1 => Some(msg.content),
|
|
|
_ => None,
|
|
|
})
|
|
|
.take(3);
|
|
|
<span class="boring">}</span></code></pre>
|
|
|
<p>想要学习更多的适配器，可以看看 <a href="https://docs.rs/tokio-stream/0.1.8/tokio_stream/trait.StreamExt.html"><code>StreamExt</code></a> 特征。</p>
|
|
|
<h2 id="实现-stream-特征"><a class="header" href="#实现-stream-特征">实现 Stream 特征</a></h2>
|
|
|
<p>如果大家还没忘记 <code>Future</code> 特征，那 <code>Stream</code> 特征相信你也会很快记住，因为它们非常类似：</p>
|
|
|
<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>use std::pin::Pin;
|
|
|
use std::task::{Context, Poll};
|
|
|
|
|
|
pub trait Stream {
|
|
|
type Item;
|
|
|
|
|
|
fn poll_next(
|
|
|
self: Pin<&mut Self>,
|
|
|
cx: &mut Context<'_>
|
|
|
) -> Poll<Option<Self::Item>>;
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
(0, None)
|
|
|
}
|
|
|
}
|
|
|
<span class="boring">}</span></code></pre>
|
|
|
<p><code>Stream::poll_next()</code> 函数跟 <code>Future::poll</code> 很相似，区别就是前者为了从 <code>stream</code> 收到多个值需要重复的进行调用。 就像在 <a href="https://course.rs/tokio/async.html"><code>深入async</code></a> 章节提到的那样，当一个 <code>stream</code> 没有做好返回一个值的准备时，它将返回一个 <code>Poll::Pending</code> ，同时将任务的 <code>waker</code> 进行注册。一旦 <code>stream</code> 准备好后， <code>waker</code> 将被调用。</p>
|
|
|
<p>通常来说，如果想要手动实现一个 <code>Stream</code>，需要组合 <code>Future</code> 和其它 <code>Stream</code>。下面，还记得在<a href="https://course.rs/tokio/async.html"><code>深入async</code></a> 中构建的 <code>Delay Future</code> 吗？现在让我们来更进一步，将它转换成一个 <code>stream</code>，每 10 毫秒生成一个值，总共生成 3 次:</p>
|
|
|
<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>use tokio_stream::Stream;
|
|
|
use std::pin::Pin;
|
|
|
use std::task::{Context, Poll};
|
|
|
use std::time::Duration;
|
|
|
|
|
|
struct Interval {
|
|
|
rem: usize,
|
|
|
delay: Delay,
|
|
|
}
|
|
|
|
|
|
impl Stream for Interval {
|
|
|
type Item = ();
|
|
|
|
|
|
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>)
|
|
|
-> Poll<Option<()>>
|
|
|
{
|
|
|
if self.rem == 0 {
|
|
|
// 去除计时器实现
|
|
|
return Poll::Ready(None);
|
|
|
}
|
|
|
|
|
|
match Pin::new(&mut self.delay).poll(cx) {
|
|
|
Poll::Ready(_) => {
|
|
|
let when = self.delay.when + Duration::from_millis(10);
|
|
|
self.delay = Delay { when };
|
|
|
self.rem -= 1;
|
|
|
Poll::Ready(Some(()))
|
|
|
}
|
|
|
Poll::Pending => Poll::Pending,
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
<span class="boring">}</span></code></pre>
|
|
|
<h4 id="async-stream"><a class="header" href="#async-stream">async-stream</a></h4>
|
|
|
<p>手动实现 <code>Stream</code> 特征实际上是相当麻烦的事，不幸地是，Rust 语言的 <code>async/await</code> 语法目前还不能用于定义 <code>stream</code>，虽然相关的工作已经在进行中。</p>
|
|
|
<p>作为替代方案，<a href="https://docs.rs/async-stream/latest/async_stream/"><code>async-stream</code></a> 包提供了一个 <code>stream!</code> 宏，它可以将一个输入转换成 <code>stream</code>，使用这个包，上面的代码可以这样实现：</p>
|
|
|
<pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
</span><span class="boring">fn main() {
|
|
|
</span>use async_stream::stream;
|
|
|
use std::time::{Duration, Instant};
|
|
|
|
|
|
stream! {
|
|
|
let mut when = Instant::now();
|
|
|
for _ in 0..3 {
|
|
|
let delay = Delay { when };
|
|
|
delay.await;
|
|
|
yield ();
|
|
|
when += Duration::from_millis(10);
|
|
|
}
|
|
|
}
|
|
|
<span class="boring">}</span></code></pre>
|
|
|
<p>嗯，看上去还是相当不错的，代码可读性大幅提升！</p>
|
|
|
<!-- todo generators -->
|
|
|
<p>是不是发现了一个关键字 <code>yield</code> ，他是用来配合生成器使用的。详见<a href="https://doc.rust-lang.org/beta/unstable-book/language-features/generators.html">原文</a></p>
|
|
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|
|
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