From: Martin Pitt <martin@piware.de>
Date: Fri, 16 Sep 2022 12:27:33 +0000 (+0200)
Subject: tokio-tutorial-mini-redis: Add first client version
X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=commitdiff_plain;h=9dce7d8d57695bd42bc0cdad6dd0f002c67701b8

tokio-tutorial-mini-redis: Add first client version

Uses message passing instead of mutexes. Does not yet send back values
from the manager.
---

diff --git a/tokio-tutorial-mini-redis/src/bin/client.rs b/tokio-tutorial-mini-redis/src/bin/client.rs
new file mode 100644
index 0000000..e7ec116
--- /dev/null
+++ b/tokio-tutorial-mini-redis/src/bin/client.rs
@@ -0,0 +1,45 @@
+use bytes::Bytes;
+use mini_redis::client;
+use tokio::sync::mpsc;
+
+#[derive(Debug)]
+enum Command {
+    Get {
+        key: String,
+    },
+    Set {
+        key: String,
+        val: Bytes,
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let (manager_tx, mut manager_rx) = mpsc::channel(32);
+
+    let manager = tokio::spawn(async move {
+        // Establish a connection to the server
+        let mut client = client::connect("127.0.0.1:6379").await.unwrap();
+
+        while let Some(cmd) = manager_rx.recv().await {
+            match cmd {
+                Command::Get { key } => { client.get(&key).await.unwrap(); }
+                Command::Set { key, val } => { client.set(&key, val).await.unwrap(); }
+            }
+        }
+    });
+
+    let manager_tx2 = manager_tx.clone();
+    // Spawn two tasks, one gets a key, the other sets a key
+    let t1 = tokio::spawn(async move {
+        manager_tx.send(Command::Get { key: "hello".to_string() }).await.unwrap();
+    });
+
+    let t2 = tokio::spawn(async move {
+        manager_tx2.send(Command::Set { key: "hello".to_string(), val: "bar".into() }).await.unwrap();
+    });
+
+    t1.await.unwrap();
+    t2.await.unwrap();
+    manager.await.unwrap();
+}