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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{collections::VecDeque, io};

<span class="kw">use </span>actix::prelude::<span class="kw-2">*</span>;
<span class="kw">use </span>actix_rt::net::TcpStream;
<span class="kw">use </span>actix_service::boxed::{<span class="self">self</span>, BoxService};
<span class="kw">use </span>actix_tls::connect::{ConnectError, ConnectInfo, Connection, ConnectorService};
<span class="kw">use </span>backoff::{backoff::Backoff, ExponentialBackoff};
<span class="kw">use </span>log::{error, info, warn};
<span class="kw">use </span>redis_async::{
    error::Error <span class="kw">as </span>RespError,
    resp::{RespCodec, RespValue},
};
<span class="kw">use </span>tokio::{
    io::{split, WriteHalf},
    sync::oneshot,
};
<span class="kw">use </span>tokio_util::codec::FramedRead;

<span class="kw">use </span><span class="kw">crate</span>::Error;

<span class="doccomment">/// Command for sending data to Redis.
</span><span class="attr">#[derive(Debug)]
</span><span class="kw">pub struct </span>Command(<span class="kw">pub </span>RespValue);

<span class="kw">impl </span>Message <span class="kw">for </span>Command {
    <span class="kw">type </span><span class="prelude-ty">Result </span>= <span class="prelude-ty">Result</span>&lt;RespValue, Error&gt;;
}

<span class="doccomment">/// Redis communication actor.
</span><span class="kw">pub struct </span>RedisActor {
    addr: String,
    connector: BoxService&lt;ConnectInfo&lt;String&gt;, Connection&lt;String, TcpStream&gt;, ConnectError&gt;,
    backoff: ExponentialBackoff,
    cell: <span class="prelude-ty">Option</span>&lt;actix::io::FramedWrite&lt;RespValue, WriteHalf&lt;TcpStream&gt;, RespCodec&gt;&gt;,
    queue: VecDeque&lt;oneshot::Sender&lt;<span class="prelude-ty">Result</span>&lt;RespValue, Error&gt;&gt;&gt;,
}

<span class="kw">impl </span>RedisActor {
    <span class="doccomment">/// Start new `Supervisor` with `RedisActor`.
    </span><span class="kw">pub fn </span>start&lt;S: Into&lt;String&gt;&gt;(addr: S) -&gt; Addr&lt;RedisActor&gt; {
        <span class="kw">let </span>addr = addr.into();

        <span class="kw">let </span>backoff = ExponentialBackoff {
            max_elapsed_time: <span class="prelude-val">None</span>,
            ..Default::default()
        };

        Supervisor::start(|<span class="kw">_</span>| RedisActor {
            addr,
            connector: boxed::service(ConnectorService::default()),
            cell: <span class="prelude-val">None</span>,
            backoff,
            queue: VecDeque::new(),
        })
    }
}

<span class="kw">impl </span>Actor <span class="kw">for </span>RedisActor {
    <span class="kw">type </span>Context = Context&lt;<span class="self">Self</span>&gt;;

    <span class="kw">fn </span>started(<span class="kw-2">&amp;mut </span><span class="self">self</span>, ctx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="self">Self</span>&gt;) {
        <span class="kw">let </span>req = ConnectInfo::new(<span class="self">self</span>.addr.to_owned());
        <span class="self">self</span>.connector
            .call(req)
            .into_actor(<span class="self">self</span>)
            .map(|res, act, ctx| <span class="kw">match </span>res {
                <span class="prelude-val">Ok</span>(conn) =&gt; {
                    <span class="kw">let </span>stream = conn.into_parts().<span class="number">0</span>;
                    <span class="macro">info!</span>(<span class="string">"Connected to redis server: {}"</span>, act.addr);

                    <span class="kw">let </span>(r, w) = split(stream);

                    <span class="comment">// configure write side of the connection
                    </span><span class="kw">let </span>framed = actix::io::FramedWrite::new(w, RespCodec, ctx);
                    act.cell = <span class="prelude-val">Some</span>(framed);

                    <span class="comment">// read side of the connection
                    </span>ctx.add_stream(FramedRead::new(r, RespCodec));

                    act.backoff.reset();
                }
                <span class="prelude-val">Err</span>(err) =&gt; {
                    <span class="macro">error!</span>(<span class="string">"Can not connect to redis server: {}"</span>, err);
                    <span class="comment">// re-connect with backoff time.
                    // we stop current context, supervisor will restart it.
                    </span><span class="kw">if let </span><span class="prelude-val">Some</span>(timeout) = act.backoff.next_backoff() {
                        ctx.run_later(timeout, |<span class="kw">_</span>, ctx| ctx.stop());
                    }
                }
            })
            .wait(ctx);
    }
}

<span class="kw">impl </span>Supervised <span class="kw">for </span>RedisActor {
    <span class="kw">fn </span>restarting(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::Context) {
        <span class="self">self</span>.cell.take();
        <span class="kw">for </span>tx <span class="kw">in </span><span class="self">self</span>.queue.drain(..) {
            <span class="kw">let _ </span>= tx.send(<span class="prelude-val">Err</span>(Error::Disconnected));
        }
    }
}

<span class="kw">impl </span>actix::io::WriteHandler&lt;io::Error&gt; <span class="kw">for </span>RedisActor {
    <span class="kw">fn </span>error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, err: io::Error, <span class="kw">_</span>: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::Context) -&gt; Running {
        <span class="macro">warn!</span>(<span class="string">"Redis connection dropped: {} error: {}"</span>, <span class="self">self</span>.addr, err);
        Running::Stop
    }
}

<span class="kw">impl </span>StreamHandler&lt;<span class="prelude-ty">Result</span>&lt;RespValue, RespError&gt;&gt; <span class="kw">for </span>RedisActor {
    <span class="kw">fn </span>handle(<span class="kw-2">&amp;mut </span><span class="self">self</span>, msg: <span class="prelude-ty">Result</span>&lt;RespValue, RespError&gt;, ctx: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::Context) {
        <span class="kw">match </span>msg {
            <span class="prelude-val">Err</span>(e) =&gt; {
                <span class="kw">if let </span><span class="prelude-val">Some</span>(tx) = <span class="self">self</span>.queue.pop_front() {
                    <span class="kw">let _ </span>= tx.send(<span class="prelude-val">Err</span>(e.into()));
                }
                ctx.stop();
            }
            <span class="prelude-val">Ok</span>(val) =&gt; {
                <span class="kw">if let </span><span class="prelude-val">Some</span>(tx) = <span class="self">self</span>.queue.pop_front() {
                    <span class="kw">let _ </span>= tx.send(<span class="prelude-val">Ok</span>(val));
                }
            }
        }
    }
}

<span class="kw">impl </span>Handler&lt;Command&gt; <span class="kw">for </span>RedisActor {
    <span class="kw">type </span><span class="prelude-ty">Result </span>= ResponseFuture&lt;<span class="prelude-ty">Result</span>&lt;RespValue, Error&gt;&gt;;

    <span class="kw">fn </span>handle(<span class="kw-2">&amp;mut </span><span class="self">self</span>, msg: Command, <span class="kw">_</span>: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::Context) -&gt; <span class="self">Self</span>::Result {
        <span class="kw">let </span>(tx, rx) = oneshot::channel();
        <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref mut </span>cell) = <span class="self">self</span>.cell {
            <span class="self">self</span>.queue.push_back(tx);
            cell.write(msg.<span class="number">0</span>);
        } <span class="kw">else </span>{
            <span class="kw">let _ </span>= tx.send(<span class="prelude-val">Err</span>(Error::NotConnected));
        }

        Box::pin(<span class="kw">async move </span>{ rx.<span class="kw">await</span>.map_err(|<span class="kw">_</span>| Error::Disconnected)<span class="question-mark">? </span>})
    }
}
</code></pre></div></section></main></body></html>