P3 command example

Signed-off-by: itowlson <ivan.towlson@fermyon.com>

Author: itowlson

examples/async/Cargo.lock

@@ -3,9 +3,11 @@ name = "job"
 version = "0.1.0"
 edition = "2021"
 
+[lib]
+crate-type = ["cdylib"]
+
 [dependencies]
 anyhow = "1.0.102"
 spin-sdk = { git = "https://github.com/spinframework/spin-rust-sdk" }
-tokio = { version = "1.51.1", features = ["macros", "rt"] }
 
 [workspace]

examples/async/Cargo.toml

@@ -6,9 +6,25 @@ The sample app wraps async code (an outbound HTTP request) as shown below:
 
 
 ```rust
-spin_executor::run(async move {
+wasip3::cli::command::export!(Main);
+
+struct Main;
+
+impl wasip3::exports::cli::run::Guest for Main {
+    async fn run() -> Result<(), ()> {
+        match main().await {
+            Ok(()) => Ok(()),
+            Err(e) => {
+                eprintln!("{e}");
+                Err(())
+            }
+        }
+    }
+}
+
+async fn main() -> anyhow::Result<()> {
   // async code goes here
-})
+}
 ```
 
 Upon running the Spin App (using `spin up`) it will send an HTTP request to `https://myip.fermyon.app` and print your public IP address to `stdout`.

examples/async/README.md

@@ -0,0 +1,26 @@
+use spin_sdk::{wasip3, http::{EmptyBody, body::IncomingBodyExt, Request, send}};
+
+wasip3::cli::command::export!(Main);
+
+struct Main;
+
+impl wasip3::exports::cli::run::Guest for Main {
+    async fn run() -> Result<(), ()> {
+        match main().await {
+            Ok(()) => Ok(()),
+            Err(e) => {
+                eprintln!("{e}");
+                Err(())
+            }
+        }
+    }
+}
+
+async fn main() -> anyhow::Result<()> {
+    let request = Request::get("https://myip.fermyon.app").body(EmptyBody::new())?;
+    let response = send(request).await?;
+    let response_bytes = response.into_body().bytes().await?;
+    let response_text = String::from_utf8_lossy(&response_bytes.as_ref());
+    println!("Your IP is: {}", response_text);
+    Ok(())
+}