example: add streaming example

This example is the same as the golang version.
See
`https://github.com/containerd/ttrpc/tree/main/integration/streaming`
for details.

Signed-off-by: wllenyj <[email protected]>

example/Cargo.toml

@@ -22,6 +22,7 @@ ttrpc = { path = "../", features = ["async"] }
 ctrlc = { version = "3.0", features = ["termination"] }
 tokio = { version = "1.0.1", features = ["signal", "time"] }
 async-trait = "0.1.42"
+rand = "0.8.5"
 
 
 [[example]]
@@ -40,5 +41,13 @@ path = "./async-server.rs"
 name = "async-client"
 path = "./async-client.rs"
 
+[[example]]
+name = "async-stream-server"
+path = "./async-stream-server.rs"
+
+[[example]]
+name = "async-stream-client"
+path = "./async-stream-client.rs"
+
 [build-dependencies]
 ttrpc-codegen = { path = "../ttrpc-codegen"}

example/Makefile

@@ -8,6 +8,8 @@ build:
 	cargo build --example client
 	cargo build --example async-server
 	cargo build --example async-client
+	cargo build --example async-stream-server
+	cargo build --example async-stream-client
 
 .PHONY: deps
 deps:

example/async-stream-client.rs

@@ -0,0 +1,174 @@
+// Copyright 2022 Alibaba Cloud. All rights reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+mod protocols;
+mod utils;
+
+use protocols::r#async::{empty, streaming, streaming_ttrpc};
+use ttrpc::context::{self, Context};
+use ttrpc::r#async::Client;
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() {
+    simple_logging::log_to_stderr(log::LevelFilter::Info);
+
+    let c = Client::connect(utils::SOCK_ADDR).unwrap();
+    let sc = streaming_ttrpc::StreamingClient::new(c);
+
+    let _now = std::time::Instant::now();
+
+    let sc1 = sc.clone();
+    let t1 = tokio::spawn(echo_request(sc1));
+
+    let sc1 = sc.clone();
+    let t2 = tokio::spawn(echo_stream(sc1));
+
+    let sc1 = sc.clone();
+    let t3 = tokio::spawn(sum_stream(sc1));
+
+    let sc1 = sc.clone();
+    let t4 = tokio::spawn(divide_stream(sc1));
+
+    let sc1 = sc.clone();
+    let t5 = tokio::spawn(echo_null(sc1));
+
+    let t6 = tokio::spawn(echo_null_stream(sc));
+
+    let _ = tokio::join!(t1, t2, t3, t4, t5, t6);
+}
+
+fn default_ctx() -> Context {
+    let mut ctx = context::with_timeout(0);
+    ctx.add("key-1".to_string(), "value-1-1".to_string());
+    ctx.add("key-1".to_string(), "value-1-2".to_string());
+    ctx.set("key-2".to_string(), vec!["value-2".to_string()]);
+
+    ctx
+}
+
+async fn echo_request(cli: streaming_ttrpc::StreamingClient) {
+    let echo1 = streaming::EchoPayload {
+        seq: 1,
+        msg: "Echo Me".to_string(),
+        ..Default::default()
+    };
+    let resp = cli.echo(default_ctx(), &echo1).await.unwrap();
+    assert_eq!(resp.msg, echo1.msg);
+    assert_eq!(resp.seq, echo1.seq + 1);
+}
+
+async fn echo_stream(cli: streaming_ttrpc::StreamingClient) {
+    let mut stream = cli.echo_stream(default_ctx()).await.unwrap();
+
+    let mut i = 0;
+    while i < 100 {
+        let echo = streaming::EchoPayload {
+            seq: i as u32,
+            msg: format!("{}: Echo in a stream", i),
+            ..Default::default()
+        };
+        stream.send(&echo).await.unwrap();
+        let resp = stream.recv().await.unwrap();
+        assert_eq!(resp.msg, echo.msg);
+        assert_eq!(resp.seq, echo.seq + 1);
+
+        i += 2;
+    }
+    stream.close_send().await.unwrap();
+    let ret = stream.recv().await;
+    assert!(matches!(ret, Err(ttrpc::Error::Eof)));
+}
+
+async fn sum_stream(cli: streaming_ttrpc::StreamingClient) {
+    let mut stream = cli.sum_stream(default_ctx()).await.unwrap();
+
+    let mut sum = streaming::Sum::new();
+    stream.send(&streaming::Part::new()).await.unwrap();
+
+    sum.num += 1;
+    let mut i = -99i32;
+    while i <= 100 {
+        let addi = streaming::Part {
+            add: i,
+            ..Default::default()
+        };
+        stream.send(&addi).await.unwrap();
+        sum.sum += i;
+        sum.num += 1;
+
+        i += 1;
+    }
+    stream.send(&streaming::Part::new()).await.unwrap();
+    sum.num += 1;
+
+    let ssum = stream.close_and_recv().await.unwrap();
+    assert_eq!(ssum.sum, sum.sum);
+    assert_eq!(ssum.num, sum.num);
+}
+
+async fn divide_stream(cli: streaming_ttrpc::StreamingClient) {
+    let expected = streaming::Sum {
+        sum: 392,
+        num: 4,
+        ..Default::default()
+    };
+    let mut stream = cli.divide_stream(default_ctx(), &expected).await.unwrap();
+
+    let mut actual = streaming::Sum::new();
+
+    // NOTE: `for part in stream.recv().await.unwrap()` can't work.
+    while let Some(part) = stream.recv().await.unwrap() {
+        actual.sum += part.add;
+        actual.num += 1;
+    }
+    assert_eq!(actual.sum, expected.sum);
+    assert_eq!(actual.num, expected.num);
+}
+
+async fn echo_null(cli: streaming_ttrpc::StreamingClient) {
+    let mut stream = cli.echo_null(default_ctx()).await.unwrap();
+
+    for i in 0..100 {
+        let echo = streaming::EchoPayload {
+            seq: i as u32,
+            msg: "non-empty empty".to_string(),
+            ..Default::default()
+        };
+        stream.send(&echo).await.unwrap();
+    }
+    let res = stream.close_and_recv().await.unwrap();
+    assert_eq!(res, empty::Empty::new());
+}
+
+async fn echo_null_stream(cli: streaming_ttrpc::StreamingClient) {
+    let stream = cli.echo_null_stream(default_ctx()).await.unwrap();
+
+    let (tx, mut rx) = stream.split();
+
+    let task = tokio::spawn(async move {
+        loop {
+            let ret = rx.recv().await;
+            if matches!(ret, Err(ttrpc::Error::Eof)) {
+                break;
+            }
+        }
+    });
+
+    for i in 0..100 {
+        let echo = streaming::EchoPayload {
+            seq: i as u32,
+            msg: "non-empty empty".to_string(),
+            ..Default::default()
+        };
+        tx.send(&echo).await.unwrap();
+    }
+
+    tx.close_send().await.unwrap();
+
+    tokio::time::timeout(tokio::time::Duration::from_secs(10), task)
+        .await
+        .unwrap()
+        .unwrap();
+}

example/async-stream-server.rs

@@ -0,0 +1,170 @@
+// Copyright 2022 Alibaba Cloud. All rights reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+mod protocols;
+mod utils;
+
+use std::sync::Arc;
+
+use log::{info, LevelFilter};
+
+use protocols::r#async::{empty, streaming, streaming_ttrpc};
+use ttrpc::asynchronous::Server;
+
+use async_trait::async_trait;
+use tokio::signal::unix::{signal, SignalKind};
+use tokio::time::sleep;
+
+struct StreamingService;
+
+#[async_trait]
+impl streaming_ttrpc::Streaming for StreamingService {
+    async fn echo(
+        &self,
+        _ctx: &::ttrpc::r#async::TtrpcContext,
+        mut e: streaming::EchoPayload,
+    ) -> ::ttrpc::Result<streaming::EchoPayload> {
+        e.seq += 1;
+        Ok(e)
+    }
+
+    async fn echo_stream(
+        &self,
+        _ctx: &::ttrpc::r#async::TtrpcContext,
+        mut s: ::ttrpc::r#async::ServerStream<streaming::EchoPayload, streaming::EchoPayload>,
+    ) -> ::ttrpc::Result<()> {
+        while let Some(mut e) = s.recv().await? {
+            e.seq += 1;
+            s.send(&e).await?;
+        }
+
+        Ok(())
+    }
+
+    async fn sum_stream(
+        &self,
+        _ctx: &::ttrpc::r#async::TtrpcContext,
+        mut s: ::ttrpc::r#async::ServerStreamReceiver<streaming::Part>,
+    ) -> ::ttrpc::Result<streaming::Sum> {
+        let mut sum = streaming::Sum::new();
+        while let Some(part) = s.recv().await? {
+            sum.sum += part.add;
+            sum.num += 1;
+        }
+
+        Ok(sum)
+    }
+
+    async fn divide_stream(
+        &self,
+        _ctx: &::ttrpc::r#async::TtrpcContext,
+        sum: streaming::Sum,
+        s: ::ttrpc::r#async::ServerStreamSender<streaming::Part>,
+    ) -> ::ttrpc::Result<()> {
+        let mut parts = vec![streaming::Part::new(); sum.num as usize];
+
+        let mut total = 0i32;
+        for i in 1..(sum.num - 2) {
+            let add = (rand::random::<u32>() % 1000) as i32 - 500;
+            parts[i as usize].add = add;
+            total += add;
+        }
+
+        parts[sum.num as usize - 2].add = sum.sum - total;
+
+        for part in parts {
+            s.send(&part).await.unwrap();
+        }
+
+        Ok(())
+    }
+
+    async fn echo_null(
+        &self,
+        _ctx: &::ttrpc::r#async::TtrpcContext,
+        mut s: ::ttrpc::r#async::ServerStreamReceiver<streaming::EchoPayload>,
+    ) -> ::ttrpc::Result<empty::Empty> {
+        let mut seq = 0;
+        while let Some(e) = s.recv().await? {
+            assert_eq!(e.seq, seq);
+            assert_eq!(e.msg.as_str(), "non-empty empty");
+            seq += 1;
+        }
+        Ok(empty::Empty::new())
+    }
+
+    async fn echo_null_stream(
+        &self,
+        _ctx: &::ttrpc::r#async::TtrpcContext,
+        s: ::ttrpc::r#async::ServerStream<empty::Empty, streaming::EchoPayload>,
+    ) -> ::ttrpc::Result<()> {
+        let msg = "non-empty empty".to_string();
+
+        let mut tasks = Vec::new();
+
+        let (tx, mut rx) = s.split();
+        let mut seq = 0u32;
+        while let Some(e) = rx.recv().await? {
+            assert_eq!(e.seq, seq);
+            assert_eq!(e.msg, msg);
+            seq += 1;
+
+            for _i in 0..10 {
+                let tx = tx.clone();
+                tasks.push(tokio::spawn(
+                    async move { tx.send(&empty::Empty::new()).await },
+                ));
+            }
+        }
+
+        for t in tasks {
+            t.await.unwrap().map_err(|e| {
+                ::ttrpc::Error::RpcStatus(::ttrpc::get_status(
+                    ::ttrpc::Code::UNKNOWN,
+                    e.to_string(),
+                ))
+            })?;
+        }
+        Ok(())
+    }
+}
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() {
+    simple_logging::log_to_stderr(LevelFilter::Info);
+
+    let s = Box::new(StreamingService {}) as Box<dyn streaming_ttrpc::Streaming + Send + Sync>;
+    let s = Arc::new(s);
+    let service = streaming_ttrpc::create_streaming(s);
+
+    utils::remove_if_sock_exist(utils::SOCK_ADDR).unwrap();
+
+    let mut server = Server::new()
+        .bind(utils::SOCK_ADDR)
+        .unwrap()
+        .register_service(service);
+
+    let mut hangup = signal(SignalKind::hangup()).unwrap();
+    let mut interrupt = signal(SignalKind::interrupt()).unwrap();
+    server.start().await.unwrap();
+
+    tokio::select! {
+        _ = hangup.recv() => {
+            // test stop_listen -> start
+            info!("stop listen");
+            server.stop_listen().await;
+            info!("start listen");
+            server.start().await.unwrap();
+
+            // hold some time for the new test connection.
+            sleep(std::time::Duration::from_secs(100)).await;
+        }
+        _ = interrupt.recv() => {
+            // test graceful shutdown
+            info!("graceful shutdown");
+            server.shutdown().await.unwrap();
+        }
+    };
+}

example/build.rs

@@ -9,7 +9,7 @@ use ttrpc_codegen::Codegen;
 use ttrpc_codegen::Customize;
 
 fn main() {
-    let protos = vec![
+    let mut protos = vec![
         "protocols/protos/github.com/kata-containers/agent/pkg/types/types.proto",
         "protocols/protos/agent.proto",
         "protocols/protos/health.proto",
@@ -28,6 +28,9 @@ fn main() {
         .run()
         .expect("Gen sync code failed.");
 
+    // Only async support stream currently.
+    protos.push("protocols/protos/streaming.proto");
+
     Codegen::new()
         .out_dir("protocols/asynchronous")
         .inputs(&protos)