Workin on an example microservice with multiple listeners

3 years ago · 59b0add792
6 changed files with 453 additions and 0 deletions
--- a/ms/Cargo.lock
+++ b/ms/Cargo.lock
@ -0,0 +1,341 @@
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+# It is not intended for manual editing.
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+ "chrono",
+ "env_logger",
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+ "tokio",
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+ "winapi",
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+ "quote",
+ "syn",
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+version = "0.1.0"
+
+[[package]]
+name = "unicode-xid"
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+ "winapi-x86_64-pc-windows-gnu",
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+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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--- a/ms/Cargo.toml
+++ b/ms/Cargo.toml
@ -0,0 +1,8 @@
+[workspace]
+members = [
+	"server",
+	"txtclient",
+]
+
+[profile.release]
+lto = true
--- a/ms/server/Cargo.toml
+++ b/ms/server/Cargo.toml
@ -0,0 +1,13 @@
+[package]
+name = "server"
+description = "A server that keeps producing content and sends them to connected clients"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+bincode = "1.3.3"
+chrono = { version = "0.4.19", features = ["serde"] }
+env_logger = "0.9.0"
+log = "0.4.14"
+serde = { version = "1.0.130", features = ["derive"] }
+tokio = { version = "1.14.0", features = ["rt", "net", "macros", "sync", "time", "io-util"] }
--- a/ms/server/src/main.rs
+++ b/ms/server/src/main.rs
@ -0,0 +1,80 @@
+use chrono::offset::Utc;
+use chrono::DateTime;
+use serde::Serialize;
+use std::net::SocketAddr;
+use tokio::io::AsyncWriteExt;
+use tokio::net::TcpListener;
+use tokio::net::TcpStream;
+use tokio::sync::broadcast;
+use tokio::time::sleep;
+use tokio::time::Duration;
+
+#[derive(Debug, Clone, Serialize)]
+struct Message {
+    received: DateTime<Utc>,
+    message: String,
+}
+
+impl Message {
+    pub fn new(message: &str) -> Self {
+        Self {
+            received: Utc::now(),
+            message: message.into(),
+        }
+    }
+}
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() {
+    env_logger::init();
+    let (tx, mut rx) = broadcast::channel::<Message>(30);
+
+    tokio::join!(consumer(rx), producer(tx.clone()), listener(tx));
+}
+
+/// Produtor de conteúdo
+async fn producer(sink: broadcast::Sender<Message>) {
+    let messages = ["Hello world", "Goodbye Earth", "See you later alligator"];
+    for message in messages.iter().cycle() {
+        match sink.send(Message::new(message)) {
+            Ok(_) => log::debug!("Send: {}", message),
+            Err(err) => log::error!("Error sending message: {:?}", err),
+        }
+        sleep(Duration::from_millis(500)).await;
+    }
+}
+
+/// Aguada conexões de clientes
+async fn listener(connector: broadcast::Sender<Message>) {
+    let listener = TcpListener::bind("127.0.0.1:4435")
+        .await
+        .expect("Failed binding");
+    loop {
+        if let Ok((socket, addr)) = listener.accept().await {
+            log::debug!("Got new client: {:?}", addr);
+            let new_receiver = connector.subscribe();
+            tokio::spawn(async move { worker(new_receiver, socket, addr).await });
+        }
+    }
+}
+
+/// Worker que envia as mensagens para os clientes
+async fn worker(mut source: broadcast::Receiver<Message>, mut stream: TcpStream, addr: SocketAddr) {
+    loop {
+        let message = source.recv().await.expect("No message");
+        log::debug!("Sending {:?} to {:?}", message, addr);
+        stream
+            .write_all(&bincode::serialize(&message).unwrap())
+            .await
+            .expect("Failed to send");
+    }
+}
+
+/// Consumidor interno
+/// Essa função existe porque o sender do broadcast precisa de pelo menos um listener.
+async fn consumer(mut receiver: broadcast::Receiver<Message>) {
+    loop {
+        let message = receiver.recv().await.expect("Invalid message");
+        log::debug!("Message: {:?}", message);
+    }
+}
--- a/ms/txtclient/Cargo.toml
+++ b/ms/txtclient/Cargo.toml
@ -0,0 +1,8 @@
+[package]
+name = "txtclient"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
--- a/ms/txtclient/src/main.rs
+++ b/ms/txtclient/src/main.rs
@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}