simple examples for async await intro slides

presentations/async-await-intro/1.rs

@@ -0,0 +1,9 @@
+async fn is_website_up(url: &str) -> Result<bool, Box<dyn Error + Send + Sync>> {
+    let url = url.parse::<hyper::Uri>()?;
+
+    let client = hyper::Client::new();
+    let res = client.get(url).await?;
+
+    let status_code = res.status();
+    Ok(status_code.is_success())
+}

presentations/async-await-intro/2.rs

@@ -0,0 +1,9 @@
+async fn fetch_into_string(url: &str) -> Result<String, Box<dyn Error + Send + Sync>> {
+    let url: hyper::Uri = url.parse()?;
+
+    let client = hyper::Client::new();
+    let res = client.get(url).await?;
+
+    let bytes = hyper::body::to_bytes(res.into_body()).await?;
+    Ok(String::from_utf8(bytes.to_vec())?)
+}

presentations/async-await-intro/3.rs

@@ -0,0 +1,4 @@
+let check_example = is_website_up("http://example.com");
+let check_forever = is_website_up("http://httpforever.com");
+
+let (example_result, forever_result) = join!(check_example, check_forever);

presentations/async-await-intro/4.rs

@@ -0,0 +1,6 @@
+select! {
+    example = fetch_into_string("http://example.com") =>
+        println!("Example is faster with body:\n{}", example?),
+    forever = fetch_into_string("http://httpforever.com") =>
+        println!("HttpForever is faster with body:\n{}", forever?),
+}

presentations/async-await-intro/example/async-await-intro/.gitignore

@@ -0,0 +1 @@
+/target