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</pre></div><pre class="rust"><code><span class="kw">use </span>std::{collections::VecDeque, io};
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<span class="kw">use </span>actix::prelude::<span class="kw-2">*</span>;
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<span class="kw">use </span>actix_rt::net::TcpStream;
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<span class="kw">use </span>actix_service::boxed::{<span class="self">self</span>, BoxService};
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<span class="kw">use </span>actix_tls::connect::{ConnectError, ConnectInfo, Connection, ConnectorService};
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<span class="kw">use </span>backoff::{backoff::Backoff, ExponentialBackoff};
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<span class="kw">use </span>log::{error, info, warn};
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<span class="kw">use </span>redis_async::{
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error::Error <span class="kw">as </span>RespError,
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resp::{RespCodec, RespValue},
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};
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<span class="kw">use </span>tokio::{
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io::{split, WriteHalf},
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sync::oneshot,
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};
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<span class="kw">use </span>tokio_util::codec::FramedRead;
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<span class="kw">use </span><span class="kw">crate</span>::Error;
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<span class="doccomment">/// Command for sending data to Redis.
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</span><span class="attr">#[derive(Debug)]
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</span><span class="kw">pub struct </span>Command(<span class="kw">pub </span>RespValue);
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<span class="kw">impl </span>Message <span class="kw">for </span>Command {
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<span class="kw">type </span><span class="prelude-ty">Result </span>= <span class="prelude-ty">Result</span><RespValue, Error>;
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}
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<span class="doccomment">/// Redis communication actor.
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</span><span class="kw">pub struct </span>RedisActor {
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addr: String,
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connector: BoxService<ConnectInfo<String>, Connection<String, TcpStream>, ConnectError>,
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backoff: ExponentialBackoff,
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cell: <span class="prelude-ty">Option</span><actix::io::FramedWrite<RespValue, WriteHalf<TcpStream>, RespCodec>>,
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queue: VecDeque<oneshot::Sender<<span class="prelude-ty">Result</span><RespValue, Error>>>,
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}
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<span class="kw">impl </span>RedisActor {
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<span class="doccomment">/// Start new `Supervisor` with `RedisActor`.
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</span><span class="kw">pub fn </span>start<S: Into<String>>(addr: S) -> Addr<RedisActor> {
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<span class="kw">let </span>addr = addr.into();
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<span class="kw">let </span>backoff = ExponentialBackoff {
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max_elapsed_time: <span class="prelude-val">None</span>,
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..Default::default()
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};
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Supervisor::start(|<span class="kw">_</span>| RedisActor {
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addr,
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connector: boxed::service(ConnectorService::default()),
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cell: <span class="prelude-val">None</span>,
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backoff,
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queue: VecDeque::new(),
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})
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}
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}
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<span class="kw">impl </span>Actor <span class="kw">for </span>RedisActor {
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<span class="kw">type </span>Context = Context<<span class="self">Self</span>>;
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<span class="kw">fn </span>started(<span class="kw-2">&mut </span><span class="self">self</span>, ctx: <span class="kw-2">&mut </span>Context<<span class="self">Self</span>>) {
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<span class="kw">let </span>req = ConnectInfo::new(<span class="self">self</span>.addr.to_owned());
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<span class="self">self</span>.connector
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.call(req)
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.into_actor(<span class="self">self</span>)
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.map(|res, act, ctx| <span class="kw">match </span>res {
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<span class="prelude-val">Ok</span>(conn) => {
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<span class="kw">let </span>stream = conn.into_parts().<span class="number">0</span>;
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<span class="macro">info!</span>(<span class="string">"Connected to redis server: {}"</span>, act.addr);
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<span class="kw">let </span>(r, w) = split(stream);
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<span class="comment">// configure write side of the connection
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</span><span class="kw">let </span>framed = actix::io::FramedWrite::new(w, RespCodec, ctx);
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act.cell = <span class="prelude-val">Some</span>(framed);
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<span class="comment">// read side of the connection
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</span>ctx.add_stream(FramedRead::new(r, RespCodec));
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act.backoff.reset();
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}
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<span class="prelude-val">Err</span>(err) => {
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<span class="macro">error!</span>(<span class="string">"Can not connect to redis server: {}"</span>, err);
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<span class="comment">// re-connect with backoff time.
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// we stop current context, supervisor will restart it.
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</span><span class="kw">if let </span><span class="prelude-val">Some</span>(timeout) = act.backoff.next_backoff() {
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ctx.run_later(timeout, |<span class="kw">_</span>, ctx| ctx.stop());
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}
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}
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})
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.wait(ctx);
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}
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}
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<span class="kw">impl </span>Supervised <span class="kw">for </span>RedisActor {
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<span class="kw">fn </span>restarting(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&mut </span><span class="self">Self</span>::Context) {
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<span class="self">self</span>.cell.take();
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<span class="kw">for </span>tx <span class="kw">in </span><span class="self">self</span>.queue.drain(..) {
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<span class="kw">let _ </span>= tx.send(<span class="prelude-val">Err</span>(Error::Disconnected));
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}
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}
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}
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<span class="kw">impl </span>actix::io::WriteHandler<io::Error> <span class="kw">for </span>RedisActor {
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<span class="kw">fn </span>error(<span class="kw-2">&mut </span><span class="self">self</span>, err: io::Error, <span class="kw">_</span>: <span class="kw-2">&mut </span><span class="self">Self</span>::Context) -> Running {
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<span class="macro">warn!</span>(<span class="string">"Redis connection dropped: {} error: {}"</span>, <span class="self">self</span>.addr, err);
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Running::Stop
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}
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}
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<span class="kw">impl </span>StreamHandler<<span class="prelude-ty">Result</span><RespValue, RespError>> <span class="kw">for </span>RedisActor {
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<span class="kw">fn </span>handle(<span class="kw-2">&mut </span><span class="self">self</span>, msg: <span class="prelude-ty">Result</span><RespValue, RespError>, ctx: <span class="kw-2">&mut </span><span class="self">Self</span>::Context) {
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<span class="kw">match </span>msg {
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<span class="prelude-val">Err</span>(e) => {
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<span class="kw">if let </span><span class="prelude-val">Some</span>(tx) = <span class="self">self</span>.queue.pop_front() {
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<span class="kw">let _ </span>= tx.send(<span class="prelude-val">Err</span>(e.into()));
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}
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ctx.stop();
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}
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<span class="prelude-val">Ok</span>(val) => {
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<span class="kw">if let </span><span class="prelude-val">Some</span>(tx) = <span class="self">self</span>.queue.pop_front() {
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<span class="kw">let _ </span>= tx.send(<span class="prelude-val">Ok</span>(val));
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}
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}
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}
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||
}
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}
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||
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<span class="kw">impl </span>Handler<Command> <span class="kw">for </span>RedisActor {
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<span class="kw">type </span><span class="prelude-ty">Result </span>= ResponseFuture<<span class="prelude-ty">Result</span><RespValue, Error>>;
|
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<span class="kw">fn </span>handle(<span class="kw-2">&mut </span><span class="self">self</span>, msg: Command, <span class="kw">_</span>: <span class="kw-2">&mut </span><span class="self">Self</span>::Context) -> <span class="self">Self</span>::Result {
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<span class="kw">let </span>(tx, rx) = oneshot::channel();
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<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 {
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<span class="self">self</span>.queue.push_back(tx);
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cell.write(msg.<span class="number">0</span>);
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} <span class="kw">else </span>{
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<span class="kw">let _ </span>= tx.send(<span class="prelude-val">Err</span>(Error::NotConnected));
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}
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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>})
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}
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}
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</code></pre></div></section></main></body></html> |