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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">prelude</span>::<span class="ident">v1</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> {<span class="ident">Async</span>, <span class="ident">IntoFuture</span>, <span class="ident">Poll</span>, <span class="ident">Future</span>};
<span class="kw">use</span> <span class="ident">stream</span>::{<span class="ident">Stream</span>, <span class="ident">Fuse</span>};
<span class="doccomment">/// An adaptor for a stream of futures to execute the futures concurrently, if</span>
<span class="doccomment">/// possible.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This adaptor will buffer up a list of pending futures, and then return their</span>
<span class="doccomment">/// results in the order that they were pulled out of the original stream. This</span>
<span class="doccomment">/// is created by the `Stream::buffered` method.</span>
<span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"streams do nothing unless polled"</span>]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Buffered</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">S</span>::<span class="ident">Item</span>: <span class="ident">IntoFuture</span>,
{
<span class="ident">stream</span>: <span class="ident">Fuse</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>,
<span class="ident">futures</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">State</span><span class="op"><<</span><span class="ident">S</span>::<span class="ident">Item</span> <span class="kw">as</span> <span class="ident">IntoFuture</span><span class="op">></span>::<span class="ident">Future</span><span class="op">>></span>,
<span class="ident">cur</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Buffered</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>,
<span class="ident">S</span>::<span class="ident">Item</span>: <span class="ident">IntoFuture</span>,
<span class="op"><<</span><span class="ident">S</span> <span class="kw">as</span> <span class="ident">Stream</span><span class="op">></span>::<span class="ident">Item</span> <span class="kw">as</span> <span class="ident">IntoFuture</span><span class="op">></span>::<span class="ident">Future</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span>,
<span class="op"><<</span><span class="ident">S</span> <span class="kw">as</span> <span class="ident">Stream</span><span class="op">></span>::<span class="ident">Item</span> <span class="kw">as</span> <span class="ident">IntoFuture</span><span class="op">></span>::<span class="ident">Item</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span>,
<span class="op"><<</span><span class="ident">S</span> <span class="kw">as</span> <span class="ident">Stream</span><span class="op">></span>::<span class="ident">Item</span> <span class="kw">as</span> <span class="ident">IntoFuture</span><span class="op">></span>::<span class="ident">Error</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span>,
{
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>.<span class="ident">debug_struct</span>(<span class="string">"Stream"</span>)
.<span class="ident">field</span>(<span class="string">"stream"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">stream</span>)
.<span class="ident">field</span>(<span class="string">"futures"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">futures</span>)
.<span class="ident">field</span>(<span class="string">"cur"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">cur</span>)
.<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">enum</span> <span class="ident">State</span><span class="op"><</span><span class="ident">S</span>: <span class="ident">Future</span><span class="op">></span> {
<span class="ident">Empty</span>,
<span class="ident">Running</span>(<span class="ident">S</span>),
<span class="ident">Finished</span>(<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">S</span>::<span class="ident">Item</span>, <span class="ident">S</span>::<span class="ident">Error</span><span class="op">></span>),
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>(<span class="ident">s</span>: <span class="ident">S</span>, <span class="ident">amt</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">Buffered</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">S</span>::<span class="ident">Item</span>: <span class="ident">IntoFuture</span><span class="op"><</span><span class="ident">Error</span><span class="op">=</span><span class="op"><</span><span class="ident">S</span> <span class="kw">as</span> <span class="ident">Stream</span><span class="op">></span>::<span class="ident">Error</span><span class="op">></span>,
{
<span class="ident">Buffered</span> {
<span class="ident">stream</span>: <span class="kw">super</span>::<span class="ident">fuse</span>::<span class="ident">new</span>(<span class="ident">s</span>),
<span class="ident">futures</span>: (<span class="number">0</span>..<span class="ident">amt</span>).<span class="ident">map</span>(<span class="op">|</span>_<span class="op">|</span> <span class="ident">State</span>::<span class="ident">Empty</span>).<span class="ident">collect</span>(),
<span class="ident">cur</span>: <span class="number">0</span>,
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> <span class="ident">Buffered</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">S</span>::<span class="ident">Item</span>: <span class="ident">IntoFuture</span>,
{
<span class="doccomment">/// Acquires a reference to the underlying stream that this combinator is</span>
<span class="doccomment">/// pulling from.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">S</span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">get_ref</span>()
}
<span class="doccomment">/// Acquires a mutable reference to the underlying stream that this</span>
<span class="doccomment">/// combinator is pulling from.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that care must be taken to avoid tampering with the state of the</span>
<span class="doccomment">/// stream which may otherwise confuse this combinator.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">S</span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">get_mut</span>()
}
<span class="doccomment">/// Consumes this combinator, returning the underlying stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this may discard intermediate state of this combinator, so</span>
<span class="doccomment">/// care should be taken to avoid losing resources when this is called.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">S</span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">into_inner</span>()
}
}
<span class="comment">// Forwarding impl of Sink from the underlying stream</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> ::<span class="ident">sink</span>::<span class="ident">Sink</span> <span class="kw">for</span> <span class="ident">Buffered</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: ::<span class="ident">sink</span>::<span class="ident">Sink</span> <span class="op">+</span> <span class="ident">Stream</span>,
<span class="ident">S</span>::<span class="ident">Item</span>: <span class="ident">IntoFuture</span>,
{
<span class="kw">type</span> <span class="ident">SinkItem</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">SinkItem</span>;
<span class="kw">type</span> <span class="ident">SinkError</span> <span class="op">=</span> <span class="ident">S</span>::<span class="ident">SinkError</span>;
<span class="kw">fn</span> <span class="ident">start_send</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">item</span>: <span class="ident">S</span>::<span class="ident">SinkItem</span>) <span class="op">-></span> ::<span class="ident">StartSend</span><span class="op"><</span><span class="ident">S</span>::<span class="ident">SinkItem</span>, <span class="ident">S</span>::<span class="ident">SinkError</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">start_send</span>(<span class="ident">item</span>)
}
<span class="kw">fn</span> <span class="ident">poll_complete</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span>(), <span class="ident">S</span>::<span class="ident">SinkError</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">poll_complete</span>()
}
<span class="kw">fn</span> <span class="ident">close</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span>(), <span class="ident">S</span>::<span class="ident">SinkError</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">close</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">S</span><span class="op">></span> <span class="ident">Stream</span> <span class="kw">for</span> <span class="ident">Buffered</span><span class="op"><</span><span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">S</span>: <span class="ident">Stream</span>,
<span class="ident">S</span>::<span class="ident">Item</span>: <span class="ident">IntoFuture</span><span class="op"><</span><span class="ident">Error</span><span class="op">=</span><span class="op"><</span><span class="ident">S</span> <span class="kw">as</span> <span class="ident">Stream</span><span class="op">></span>::<span class="ident">Error</span><span class="op">></span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="op"><</span><span class="ident">S</span>::<span class="ident">Item</span> <span class="kw">as</span> <span class="ident">IntoFuture</span><span class="op">></span>::<span class="ident">Item</span>;
<span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="op"><</span><span class="ident">S</span> <span class="kw">as</span> <span class="ident">Stream</span><span class="op">></span>::<span class="ident">Error</span>;
<span class="kw">fn</span> <span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="comment">// First, try to fill in all the futures</span>
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="self">self</span>.<span class="ident">futures</span>.<span class="ident">len</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">cur</span> <span class="op">+</span> <span class="ident">i</span>;
<span class="kw">if</span> <span class="ident">idx</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">futures</span>.<span class="ident">len</span>() {
<span class="ident">idx</span> <span class="op">-=</span> <span class="self">self</span>.<span class="ident">futures</span>.<span class="ident">len</span>();
}
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">State</span>::<span class="ident">Empty</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">futures</span>[<span class="ident">idx</span>] {
<span class="kw">match</span> <span class="macro">try</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">poll</span>()) {
<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="prelude-val">Some</span>(<span class="ident">future</span>)) <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">future</span> <span class="op">=</span> <span class="ident">future</span>.<span class="ident">into_future</span>();
<span class="self">self</span>.<span class="ident">futures</span>[<span class="ident">idx</span>] <span class="op">=</span> <span class="ident">State</span>::<span class="ident">Running</span>(<span class="ident">future</span>);
}
<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="prelude-val">None</span>) <span class="op">=></span> <span class="kw">break</span>,
<span class="ident">Async</span>::<span class="ident">NotReady</span> <span class="op">=></span> <span class="kw">break</span>,
}
}
}
<span class="comment">// Next, try and step all the futures forward</span>
<span class="kw">for</span> <span class="ident">future</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">futures</span>.<span class="ident">iter_mut</span>() {
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="ident">future</span> {
<span class="ident">State</span>::<span class="ident">Running</span>(<span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">s</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">s</span>.<span class="ident">poll</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>) <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="ident">e</span>)) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">e</span>),
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
}
}
_ <span class="op">=></span> <span class="kw">continue</span>,
};
<span class="kw-2">*</span><span class="ident">future</span> <span class="op">=</span> <span class="ident">State</span>::<span class="ident">Finished</span>(<span class="ident">result</span>);
}
<span class="comment">// Check to see if our current future is done.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">State</span>::<span class="ident">Finished</span>(_) <span class="op">=</span> <span class="self">self</span>.<span class="ident">futures</span>[<span class="self">self</span>.<span class="ident">cur</span>] {
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">futures</span>[<span class="self">self</span>.<span class="ident">cur</span>], <span class="ident">State</span>::<span class="ident">Empty</span>) {
<span class="ident">State</span>::<span class="ident">Finished</span>(<span class="ident">r</span>) <span class="op">=></span> <span class="ident">r</span>,
_ <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(),
};
<span class="self">self</span>.<span class="ident">cur</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">cur</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">futures</span>.<span class="ident">len</span>() {
<span class="self">self</span>.<span class="ident">cur</span> <span class="op">=</span> <span class="number">0</span>;
}
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="prelude-val">Some</span>(<span class="macro">try</span><span class="macro">!</span>(<span class="ident">r</span>))))
}
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">stream</span>.<span class="ident">is_done</span>() {
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">State</span>::<span class="ident">Empty</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">futures</span>[<span class="self">self</span>.<span class="ident">cur</span>] {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="prelude-val">None</span>))
}
}
<span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>)
}
}
</pre>
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