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</pre><pre class="rust ">
<span class="doccomment">//! `WebSocket` support for Actix</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! To setup a `WebSocket`, first do web socket handshake then on success</span>
<span class="doccomment">//! convert `Payload` into a `WsStream` stream and then use `WsWriter` to</span>
<span class="doccomment">//! communicate with the peer.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Example</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! # extern crate actix_web;</span>
<span class="doccomment">//! # use actix_web::actix::*;</span>
<span class="doccomment">//! # use actix_web::*;</span>
<span class="doccomment">//! use actix_web::{ws, HttpRequest, HttpResponse};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // do websocket handshake and start actor</span>
<span class="doccomment">//! fn ws_index(req: &amp;HttpRequest) -&gt; Result&lt;HttpResponse&gt; {</span>
<span class="doccomment">//!     ws::start(req, Ws)</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! struct Ws;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! impl Actor for Ws {</span>
<span class="doccomment">//!     type Context = ws::WebsocketContext&lt;Self&gt;;</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Handler for ws::Message messages</span>
<span class="doccomment">//! impl StreamHandler&lt;ws::Message, ws::ProtocolError&gt; for Ws {</span>
<span class="doccomment">//!     fn handle(&amp;mut self, msg: ws::Message, ctx: &amp;mut Self::Context) {</span>
<span class="doccomment">//!         match msg {</span>
<span class="doccomment">//!             ws::Message::Ping(msg) =&gt; ctx.pong(&amp;msg),</span>
<span class="doccomment">//!             ws::Message::Text(text) =&gt; ctx.text(text),</span>
<span class="doccomment">//!             ws::Message::Binary(bin) =&gt; ctx.binary(bin),</span>
<span class="doccomment">//!             _ =&gt; (),</span>
<span class="doccomment">//!         }</span>
<span class="doccomment">//!     }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! #</span>
<span class="doccomment">//! # fn main() {</span>
<span class="doccomment">//! #    App::new()</span>
<span class="doccomment">//! #      .resource(&quot;/ws/&quot;, |r| r.f(ws_index))  // &lt;- register websocket route</span>
<span class="doccomment">//! #      .finish();</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="kw">use</span> <span class="ident">bytes</span>::<span class="ident">Bytes</span>;
<span class="kw">use</span> <span class="ident">futures</span>::{<span class="ident">Async</span>, <span class="ident">Poll</span>, <span class="ident">Stream</span>};
<span class="kw">use</span> <span class="ident">http</span>::{<span class="ident">header</span>, <span class="ident">Method</span>, <span class="ident">StatusCode</span>};

<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">actix</span>::{<span class="ident">Actor</span>, <span class="ident">StreamHandler</span>};

<span class="kw">use</span> <span class="ident">body</span>::<span class="ident">Binary</span>;
<span class="kw">use</span> <span class="ident">error</span>::{<span class="ident">Error</span>, <span class="ident">PayloadError</span>, <span class="ident">ResponseError</span>};
<span class="kw">use</span> <span class="ident">httpmessage</span>::<span class="ident">HttpMessage</span>;
<span class="kw">use</span> <span class="ident">httprequest</span>::<span class="ident">HttpRequest</span>;
<span class="kw">use</span> <span class="ident">httpresponse</span>::{<span class="ident">ConnectionType</span>, <span class="ident">HttpResponse</span>, <span class="ident">HttpResponseBuilder</span>};
<span class="kw">use</span> <span class="ident">payload</span>::<span class="ident">PayloadBuffer</span>;

<span class="kw">mod</span> <span class="ident">client</span>;
<span class="kw">mod</span> <span class="ident">context</span>;
<span class="kw">mod</span> <span class="ident">frame</span>;
<span class="kw">mod</span> <span class="ident">mask</span>;
<span class="kw">mod</span> <span class="ident">proto</span>;

<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">client</span>::{
    <span class="ident">Client</span>, <span class="ident">ClientError</span>, <span class="ident">ClientHandshake</span>, <span class="ident">ClientReader</span>, <span class="ident">ClientWriter</span>,
};
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">context</span>::<span class="ident">WebsocketContext</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">frame</span>::{<span class="ident">Frame</span>, <span class="ident">FramedMessage</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">proto</span>::{<span class="ident">CloseCode</span>, <span class="ident">CloseReason</span>, <span class="ident">OpCode</span>};

<span class="doccomment">/// Websocket protocol errors</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Fail</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ProtocolError</span> {
    <span class="doccomment">/// Received an unmasked frame from client</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Received an unmasked frame from client&quot;</span>)]</span>
    <span class="ident">UnmaskedFrame</span>,
    <span class="doccomment">/// Received a masked frame from server</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Received a masked frame from server&quot;</span>)]</span>
    <span class="ident">MaskedFrame</span>,
    <span class="doccomment">/// Encountered invalid opcode</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Invalid opcode: {}&quot;</span>, <span class="ident">_0</span>)]</span>
    <span class="ident">InvalidOpcode</span>(<span class="ident">u8</span>),
    <span class="doccomment">/// Invalid control frame length</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Invalid control frame length: {}&quot;</span>, <span class="ident">_0</span>)]</span>
    <span class="ident">InvalidLength</span>(<span class="ident">usize</span>),
    <span class="doccomment">/// Bad web socket op code</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Bad web socket op code&quot;</span>)]</span>
    <span class="ident">BadOpCode</span>,
    <span class="doccomment">/// A payload reached size limit.</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;A payload reached size limit.&quot;</span>)]</span>
    <span class="ident">Overflow</span>,
    <span class="doccomment">/// Continuation is not supported</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Continuation is not supported.&quot;</span>)]</span>
    <span class="ident">NoContinuation</span>,
    <span class="doccomment">/// Bad utf-8 encoding</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Bad utf-8 encoding.&quot;</span>)]</span>
    <span class="ident">BadEncoding</span>,
    <span class="doccomment">/// Payload error</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Payload error: {}&quot;</span>, <span class="ident">_0</span>)]</span>
    <span class="ident">Payload</span>(<span class="attribute">#[<span class="ident">cause</span>]</span> <span class="ident">PayloadError</span>),
}

<span class="kw">impl</span> <span class="ident">ResponseError</span> <span class="kw">for</span> <span class="ident">ProtocolError</span> {}

<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">PayloadError</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">ProtocolError</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">PayloadError</span>) <span class="op">-&gt;</span> <span class="ident">ProtocolError</span> {
        <span class="ident">ProtocolError</span>::<span class="ident">Payload</span>(<span class="ident">err</span>)
    }
}

<span class="doccomment">/// Websocket handshake errors</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Fail</span>, <span class="ident">PartialEq</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">HandshakeError</span> {
    <span class="doccomment">/// Only get method is allowed</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Method not allowed&quot;</span>)]</span>
    <span class="ident">GetMethodRequired</span>,
    <span class="doccomment">/// Upgrade header if not set to websocket</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Websocket upgrade is expected&quot;</span>)]</span>
    <span class="ident">NoWebsocketUpgrade</span>,
    <span class="doccomment">/// Connection header is not set to upgrade</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Connection upgrade is expected&quot;</span>)]</span>
    <span class="ident">NoConnectionUpgrade</span>,
    <span class="doccomment">/// Websocket version header is not set</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Websocket version header is required&quot;</span>)]</span>
    <span class="ident">NoVersionHeader</span>,
    <span class="doccomment">/// Unsupported websocket version</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Unsupported version&quot;</span>)]</span>
    <span class="ident">UnsupportedVersion</span>,
    <span class="doccomment">/// Websocket key is not set or wrong</span>
    <span class="attribute">#[<span class="ident">fail</span>(<span class="ident">display</span> <span class="op">=</span> <span class="string">&quot;Unknown websocket key&quot;</span>)]</span>
    <span class="ident">BadWebsocketKey</span>,
}

<span class="kw">impl</span> <span class="ident">ResponseError</span> <span class="kw">for</span> <span class="ident">HandshakeError</span> {
    <span class="kw">fn</span> <span class="ident">error_response</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">HttpResponse</span> {
        <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
            <span class="ident">HandshakeError</span>::<span class="ident">GetMethodRequired</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">MethodNotAllowed</span>()
                .<span class="ident">header</span>(<span class="ident">header</span>::<span class="ident">ALLOW</span>, <span class="string">&quot;GET&quot;</span>)
                .<span class="ident">finish</span>(),
            <span class="ident">HandshakeError</span>::<span class="ident">NoWebsocketUpgrade</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">BadRequest</span>()
                .<span class="ident">reason</span>(<span class="string">&quot;No WebSocket UPGRADE header found&quot;</span>)
                .<span class="ident">finish</span>(),
            <span class="ident">HandshakeError</span>::<span class="ident">NoConnectionUpgrade</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">BadRequest</span>()
                .<span class="ident">reason</span>(<span class="string">&quot;No CONNECTION upgrade&quot;</span>)
                .<span class="ident">finish</span>(),
            <span class="ident">HandshakeError</span>::<span class="ident">NoVersionHeader</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">BadRequest</span>()
                .<span class="ident">reason</span>(<span class="string">&quot;Websocket version header is required&quot;</span>)
                .<span class="ident">finish</span>(),
            <span class="ident">HandshakeError</span>::<span class="ident">UnsupportedVersion</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">BadRequest</span>()
                .<span class="ident">reason</span>(<span class="string">&quot;Unsupported version&quot;</span>)
                .<span class="ident">finish</span>(),
            <span class="ident">HandshakeError</span>::<span class="ident">BadWebsocketKey</span> <span class="op">=&gt;</span> <span class="ident">HttpResponse</span>::<span class="ident">BadRequest</span>()
                .<span class="ident">reason</span>(<span class="string">&quot;Handshake error&quot;</span>)
                .<span class="ident">finish</span>(),
        }
    }
}

<span class="doccomment">/// `WebSocket` Message</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Message</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Message</span> {
    <span class="doccomment">/// Text message</span>
    <span class="ident">Text</span>(<span class="ident">String</span>),
    <span class="doccomment">/// Binary message</span>
    <span class="ident">Binary</span>(<span class="ident">Binary</span>),
    <span class="doccomment">/// Ping message</span>
    <span class="ident">Ping</span>(<span class="ident">String</span>),
    <span class="doccomment">/// Pong message</span>
    <span class="ident">Pong</span>(<span class="ident">String</span>),
    <span class="doccomment">/// Close message with optional reason</span>
    <span class="ident">Close</span>(<span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CloseReason</span><span class="op">&gt;</span>),
}

<span class="doccomment">/// Do websocket handshake and start actor</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">start</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">S</span><span class="op">&gt;</span>(<span class="ident">req</span>: <span class="kw-2">&amp;</span><span class="ident">HttpRequest</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>, <span class="ident">actor</span>: <span class="ident">A</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">HttpResponse</span>, <span class="ident">Error</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">A</span>: <span class="ident">Actor</span><span class="op">&lt;</span><span class="ident">Context</span> <span class="op">=</span> <span class="ident">WebsocketContext</span><span class="op">&lt;</span><span class="ident">A</span>, <span class="ident">S</span><span class="op">&gt;&gt;</span> <span class="op">+</span> <span class="ident">StreamHandler</span><span class="op">&lt;</span><span class="ident">Message</span>, <span class="ident">ProtocolError</span><span class="op">&gt;</span>,
    <span class="ident">S</span>: <span class="lifetime">&#39;static</span>,
{
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">resp</span> <span class="op">=</span> <span class="ident">handshake</span>(<span class="ident">req</span>)<span class="question-mark">?</span>;
    <span class="kw">let</span> <span class="ident">stream</span> <span class="op">=</span> <span class="ident">WsStream</span>::<span class="ident">new</span>(<span class="ident">req</span>.<span class="ident">payload</span>());

    <span class="kw">let</span> <span class="ident">body</span> <span class="op">=</span> <span class="ident">WebsocketContext</span>::<span class="ident">create</span>(<span class="ident">req</span>.<span class="ident">clone</span>(), <span class="ident">actor</span>, <span class="ident">stream</span>);
    <span class="prelude-val">Ok</span>(<span class="ident">resp</span>.<span class="ident">body</span>(<span class="ident">body</span>))
}

<span class="doccomment">/// Prepare `WebSocket` handshake response.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function returns handshake `HttpResponse`, ready to send to peer.</span>
<span class="doccomment">/// It does not perform any IO.</span>
<span class="doccomment">///</span>
<span class="comment">// /// `protocols` is a sequence of known protocols. On successful handshake,</span>
<span class="comment">// /// the returned response headers contain the first protocol in this list</span>
<span class="comment">// /// which the server also knows.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">handshake</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>(
    <span class="ident">req</span>: <span class="kw-2">&amp;</span><span class="ident">HttpRequest</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>,
) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">HttpResponseBuilder</span>, <span class="ident">HandshakeError</span><span class="op">&gt;</span> {
    <span class="comment">// WebSocket accepts only GET</span>
    <span class="kw">if</span> <span class="kw-2">*</span><span class="ident">req</span>.<span class="ident">method</span>() <span class="op">!=</span> <span class="ident">Method</span>::<span class="ident">GET</span> {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">HandshakeError</span>::<span class="ident">GetMethodRequired</span>);
    }

    <span class="comment">// Check for &quot;UPGRADE&quot; to websocket header</span>
    <span class="kw">let</span> <span class="ident">has_hdr</span> <span class="op">=</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">hdr</span>) <span class="op">=</span> <span class="ident">req</span>.<span class="ident">headers</span>().<span class="ident">get</span>(<span class="ident">header</span>::<span class="ident">UPGRADE</span>) {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=</span> <span class="ident">hdr</span>.<span class="ident">to_str</span>() {
            <span class="ident">s</span>.<span class="ident">to_lowercase</span>().<span class="ident">contains</span>(<span class="string">&quot;websocket&quot;</span>)
        } <span class="kw">else</span> {
            <span class="bool-val">false</span>
        }
    } <span class="kw">else</span> {
        <span class="bool-val">false</span>
    };
    <span class="kw">if</span> <span class="op">!</span><span class="ident">has_hdr</span> {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">HandshakeError</span>::<span class="ident">NoWebsocketUpgrade</span>);
    }

    <span class="comment">// Upgrade connection</span>
    <span class="kw">if</span> <span class="op">!</span><span class="ident">req</span>.<span class="ident">upgrade</span>() {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">HandshakeError</span>::<span class="ident">NoConnectionUpgrade</span>);
    }

    <span class="comment">// check supported version</span>
    <span class="kw">if</span> <span class="op">!</span><span class="ident">req</span>.<span class="ident">headers</span>().<span class="ident">contains_key</span>(<span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_VERSION</span>) {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">HandshakeError</span>::<span class="ident">NoVersionHeader</span>);
    }
    <span class="kw">let</span> <span class="ident">supported_ver</span> <span class="op">=</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">hdr</span>) <span class="op">=</span> <span class="ident">req</span>.<span class="ident">headers</span>().<span class="ident">get</span>(<span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_VERSION</span>) {
            <span class="ident">hdr</span> <span class="op">==</span> <span class="string">&quot;13&quot;</span> <span class="op">||</span> <span class="ident">hdr</span> <span class="op">==</span> <span class="string">&quot;8&quot;</span> <span class="op">||</span> <span class="ident">hdr</span> <span class="op">==</span> <span class="string">&quot;7&quot;</span>
        } <span class="kw">else</span> {
            <span class="bool-val">false</span>
        }
    };
    <span class="kw">if</span> <span class="op">!</span><span class="ident">supported_ver</span> {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">HandshakeError</span>::<span class="ident">UnsupportedVersion</span>);
    }

    <span class="comment">// check client handshake for validity</span>
    <span class="kw">if</span> <span class="op">!</span><span class="ident">req</span>.<span class="ident">headers</span>().<span class="ident">contains_key</span>(<span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_KEY</span>) {
        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">HandshakeError</span>::<span class="ident">BadWebsocketKey</span>);
    }
    <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> {
        <span class="kw">let</span> <span class="ident">key</span> <span class="op">=</span> <span class="ident">req</span>.<span class="ident">headers</span>().<span class="ident">get</span>(<span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_KEY</span>).<span class="ident">unwrap</span>();
        <span class="ident">proto</span>::<span class="ident">hash_key</span>(<span class="ident">key</span>.<span class="ident">as_ref</span>())
    };

    <span class="prelude-val">Ok</span>(<span class="ident">HttpResponse</span>::<span class="ident">build</span>(<span class="ident">StatusCode</span>::<span class="ident">SWITCHING_PROTOCOLS</span>)
        .<span class="ident">connection_type</span>(<span class="ident">ConnectionType</span>::<span class="ident">Upgrade</span>)
        .<span class="ident">header</span>(<span class="ident">header</span>::<span class="ident">UPGRADE</span>, <span class="string">&quot;websocket&quot;</span>)
        .<span class="ident">header</span>(<span class="ident">header</span>::<span class="ident">TRANSFER_ENCODING</span>, <span class="string">&quot;chunked&quot;</span>)
        .<span class="ident">header</span>(<span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_ACCEPT</span>, <span class="ident">key</span>.<span class="ident">as_str</span>())
        .<span class="ident">take</span>())
}

<span class="doccomment">/// Maps `Payload` stream into stream of `ws::Message` items</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">WsStream</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span> {
    <span class="ident">rx</span>: <span class="ident">PayloadBuffer</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>,
    <span class="ident">closed</span>: <span class="ident">bool</span>,
    <span class="ident">max_size</span>: <span class="ident">usize</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span> <span class="ident">WsStream</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">S</span>: <span class="ident">Stream</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">Bytes</span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">PayloadError</span><span class="op">&gt;</span>,
{
    <span class="doccomment">/// Create new websocket frames stream</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">stream</span>: <span class="ident">S</span>) <span class="op">-&gt;</span> <span class="ident">WsStream</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span> {
        <span class="ident">WsStream</span> {
            <span class="ident">rx</span>: <span class="ident">PayloadBuffer</span>::<span class="ident">new</span>(<span class="ident">stream</span>),
            <span class="ident">closed</span>: <span class="bool-val">false</span>,
            <span class="ident">max_size</span>: <span class="number">65_536</span>,
        }
    }

    <span class="doccomment">/// Set max frame size</span>
    <span class="doccomment">///</span>
    <span class="doccomment">/// By default max size is set to 64kb</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max_size</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="self">Self</span> {
        <span class="self">self</span>.<span class="ident">max_size</span> <span class="op">=</span> <span class="ident">size</span>;
        <span class="self">self</span>
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span> <span class="ident">Stream</span> <span class="kw">for</span> <span class="ident">WsStream</span><span class="op">&lt;</span><span class="ident">S</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">S</span>: <span class="ident">Stream</span><span class="op">&lt;</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">Bytes</span>, <span class="ident">Error</span> <span class="op">=</span> <span class="ident">PayloadError</span><span class="op">&gt;</span>,
{
    <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">Message</span>;
    <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">ProtocolError</span>;

    <span class="kw">fn</span> <span class="ident">poll</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Poll</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">&gt;</span>, <span class="self">Self</span>::<span class="ident">Error</span><span class="op">&gt;</span> {
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">closed</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="kw">match</span> <span class="ident">Frame</span>::<span class="ident">parse</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">rx</span>, <span class="bool-val">true</span>, <span class="self">self</span>.<span class="ident">max_size</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="ident">frame</span>))) <span class="op">=&gt;</span> {
                <span class="kw">let</span> (<span class="ident">finished</span>, <span class="ident">opcode</span>, <span class="ident">payload</span>) <span class="op">=</span> <span class="ident">frame</span>.<span class="ident">unpack</span>();

                <span class="comment">// continuation is not supported</span>
                <span class="kw">if</span> <span class="op">!</span><span class="ident">finished</span> {
                    <span class="self">self</span>.<span class="ident">closed</span> <span class="op">=</span> <span class="bool-val">true</span>;
                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">ProtocolError</span>::<span class="ident">NoContinuation</span>);
                }

                <span class="kw">match</span> <span class="ident">opcode</span> {
                    <span class="ident">OpCode</span>::<span class="ident">Continue</span> <span class="op">=&gt;</span> <span class="prelude-val">Err</span>(<span class="ident">ProtocolError</span>::<span class="ident">NoContinuation</span>),
                    <span class="ident">OpCode</span>::<span class="ident">Bad</span> <span class="op">=&gt;</span> {
                        <span class="self">self</span>.<span class="ident">closed</span> <span class="op">=</span> <span class="bool-val">true</span>;
                        <span class="prelude-val">Err</span>(<span class="ident">ProtocolError</span>::<span class="ident">BadOpCode</span>)
                    }
                    <span class="ident">OpCode</span>::<span class="ident">Close</span> <span class="op">=&gt;</span> {
                        <span class="self">self</span>.<span class="ident">closed</span> <span class="op">=</span> <span class="bool-val">true</span>;
                        <span class="kw">let</span> <span class="ident">close_reason</span> <span class="op">=</span> <span class="ident">Frame</span>::<span class="ident">parse_close_payload</span>(<span class="kw-2">&amp;</span><span class="ident">payload</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="ident">Message</span>::<span class="ident">Close</span>(<span class="ident">close_reason</span>))))
                    }
                    <span class="ident">OpCode</span>::<span class="ident">Ping</span> <span class="op">=&gt;</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="ident">Message</span>::<span class="ident">Ping</span>(
                        <span class="ident">String</span>::<span class="ident">from_utf8_lossy</span>(<span class="ident">payload</span>.<span class="ident">as_ref</span>()).<span class="ident">into</span>(),
                    )))),
                    <span class="ident">OpCode</span>::<span class="ident">Pong</span> <span class="op">=&gt;</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="ident">Message</span>::<span class="ident">Pong</span>(
                        <span class="ident">String</span>::<span class="ident">from_utf8_lossy</span>(<span class="ident">payload</span>.<span class="ident">as_ref</span>()).<span class="ident">into</span>(),
                    )))),
                    <span class="ident">OpCode</span>::<span class="ident">Binary</span> <span class="op">=&gt;</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="ident">Message</span>::<span class="ident">Binary</span>(<span class="ident">payload</span>)))),
                    <span class="ident">OpCode</span>::<span class="ident">Text</span> <span class="op">=&gt;</span> {
                        <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">from</span>(<span class="ident">payload</span>.<span class="ident">as_ref</span>());
                        <span class="kw">match</span> <span class="ident">String</span>::<span class="ident">from_utf8</span>(<span class="ident">tmp</span>) {
                            <span class="prelude-val">Ok</span>(<span class="ident">s</span>) <span class="op">=&gt;</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="ident">Message</span>::<span class="ident">Text</span>(<span class="ident">s</span>)))),
                            <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=&gt;</span> {
                                <span class="self">self</span>.<span class="ident">closed</span> <span class="op">=</span> <span class="bool-val">true</span>;
                                <span class="prelude-val">Err</span>(<span class="ident">ProtocolError</span>::<span class="ident">BadEncoding</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="op">=&gt;</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>) <span class="op">=&gt;</span> <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">NotReady</span>),
            <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=&gt;</span> {
                <span class="self">self</span>.<span class="ident">closed</span> <span class="op">=</span> <span class="bool-val">true</span>;
                <span class="prelude-val">Err</span>(<span class="ident">e</span>)
            }
        }
    }
}

<span class="doccomment">/// Common writing methods for a websocket.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">WsWriter</span> {
    <span class="doccomment">/// Send a text</span>
    <span class="kw">fn</span> <span class="ident">send_text</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">Binary</span><span class="op">&gt;&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">text</span>: <span class="ident">T</span>);
    <span class="doccomment">/// Send a binary</span>
    <span class="kw">fn</span> <span class="ident">send_binary</span><span class="op">&lt;</span><span class="ident">B</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">Binary</span><span class="op">&gt;&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data</span>: <span class="ident">B</span>);
    <span class="doccomment">/// Send a ping message</span>
    <span class="kw">fn</span> <span class="ident">send_ping</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">message</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>);
    <span class="doccomment">/// Send a pong message</span>
    <span class="kw">fn</span> <span class="ident">send_pong</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">message</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>);
    <span class="doccomment">/// Close the connection</span>
    <span class="kw">fn</span> <span class="ident">send_close</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">reason</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">CloseReason</span><span class="op">&gt;</span>);
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="ident">http</span>::{<span class="ident">header</span>, <span class="ident">Method</span>};
    <span class="kw">use</span> <span class="ident">test</span>::<span class="ident">TestRequest</span>;

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_handshake</span>() {
        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>().<span class="ident">method</span>(<span class="ident">Method</span>::<span class="ident">POST</span>).<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">HandshakeError</span>::<span class="ident">GetMethodRequired</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">err</span>().<span class="ident">unwrap</span>()
        );

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>().<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">HandshakeError</span>::<span class="ident">NoWebsocketUpgrade</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">err</span>().<span class="ident">unwrap</span>()
        );

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>()
            .<span class="ident">header</span>(<span class="ident">header</span>::<span class="ident">UPGRADE</span>, <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;test&quot;</span>))
            .<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">HandshakeError</span>::<span class="ident">NoWebsocketUpgrade</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">err</span>().<span class="ident">unwrap</span>()
        );

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>()
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">UPGRADE</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;websocket&quot;</span>),
            )
            .<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">HandshakeError</span>::<span class="ident">NoConnectionUpgrade</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">err</span>().<span class="ident">unwrap</span>()
        );

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>()
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">UPGRADE</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;websocket&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">CONNECTION</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;upgrade&quot;</span>),
            )
            .<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">HandshakeError</span>::<span class="ident">NoVersionHeader</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">err</span>().<span class="ident">unwrap</span>()
        );

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>()
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">UPGRADE</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;websocket&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">CONNECTION</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;upgrade&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_VERSION</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;5&quot;</span>),
            )
            .<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">HandshakeError</span>::<span class="ident">UnsupportedVersion</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">err</span>().<span class="ident">unwrap</span>()
        );

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>()
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">UPGRADE</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;websocket&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">CONNECTION</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;upgrade&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_VERSION</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;13&quot;</span>),
            )
            .<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">HandshakeError</span>::<span class="ident">BadWebsocketKey</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">err</span>().<span class="ident">unwrap</span>()
        );

        <span class="kw">let</span> <span class="ident">req</span> <span class="op">=</span> <span class="ident">TestRequest</span>::<span class="ident">default</span>()
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">UPGRADE</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;websocket&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">CONNECTION</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;upgrade&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_VERSION</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;13&quot;</span>),
            )
            .<span class="ident">header</span>(
                <span class="ident">header</span>::<span class="ident">SEC_WEBSOCKET_KEY</span>,
                <span class="ident">header</span>::<span class="ident">HeaderValue</span>::<span class="ident">from_static</span>(<span class="string">&quot;13&quot;</span>),
            )
            .<span class="ident">finish</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(
            <span class="ident">StatusCode</span>::<span class="ident">SWITCHING_PROTOCOLS</span>,
            <span class="ident">handshake</span>(<span class="kw-2">&amp;</span><span class="ident">req</span>).<span class="ident">unwrap</span>().<span class="ident">finish</span>().<span class="ident">status</span>()
        );
    }

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">test_wserror_http_response</span>() {
        <span class="kw">let</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span> <span class="op">=</span> <span class="ident">HandshakeError</span>::<span class="ident">GetMethodRequired</span>.<span class="ident">error_response</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">status</span>(), <span class="ident">StatusCode</span>::<span class="ident">METHOD_NOT_ALLOWED</span>);
        <span class="kw">let</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span> <span class="op">=</span> <span class="ident">HandshakeError</span>::<span class="ident">NoWebsocketUpgrade</span>.<span class="ident">error_response</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">status</span>(), <span class="ident">StatusCode</span>::<span class="ident">BAD_REQUEST</span>);
        <span class="kw">let</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span> <span class="op">=</span> <span class="ident">HandshakeError</span>::<span class="ident">NoConnectionUpgrade</span>.<span class="ident">error_response</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">status</span>(), <span class="ident">StatusCode</span>::<span class="ident">BAD_REQUEST</span>);
        <span class="kw">let</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span> <span class="op">=</span> <span class="ident">HandshakeError</span>::<span class="ident">NoVersionHeader</span>.<span class="ident">error_response</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">status</span>(), <span class="ident">StatusCode</span>::<span class="ident">BAD_REQUEST</span>);
        <span class="kw">let</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span> <span class="op">=</span> <span class="ident">HandshakeError</span>::<span class="ident">UnsupportedVersion</span>.<span class="ident">error_response</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">status</span>(), <span class="ident">StatusCode</span>::<span class="ident">BAD_REQUEST</span>);
        <span class="kw">let</span> <span class="ident">resp</span>: <span class="ident">HttpResponse</span> <span class="op">=</span> <span class="ident">HandshakeError</span>::<span class="ident">BadWebsocketKey</span>.<span class="ident">error_response</span>();
        <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">resp</span>.<span class="ident">status</span>(), <span class="ident">StatusCode</span>::<span class="ident">BAD_REQUEST</span>);
    }
}
</pre>
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