Add Wasm Blog Post about Fermyon's Spin SDK for Rust

Author: Timo Stark

source/news/2024/fermyon-spin-rust-sdk.rst

@@ -0,0 +1,88 @@
+:orphan:
+
+############################################################
+WebAssembly Components with Fermyons Spin SDK for Rust
+############################################################
+
+In our blog series `Part 1 </news/2024/wasm-component-model-part-1/>`__ and `2 </news/2024/wasm-component-model-part-2/>`__ we have covered the core mechanism of the 
+WebAssembly Component Model and show cased how to create a Wasm Component using WASI 0.2 APIs and the **wasi/http:proxy** world.
+
+In this blog post, we will have a look on the `Fermyon's Spin <https://www.fermyon.com/spin>`__ SDK for `Rust <https://fermyon.github.io/rust-docs/spin/main/spin_sdk/index.html>`__ and create a component that can be hosted on NGINX Unit.
+
+The Spin SDK for Rust comes with a great developer experience as it wraps a lot of the manual work in an easy to consume Rust API.
+
+Let's start by creating a new Rust library using **cargo new**. This will create a new library project in a sub-directory **test-spin-component** of our current work directory.
+
+
+.. code-block:: bash
+
+   $ cargo new --lib test-spin-component
+   $ cd test-spin-component
+
+Add the latest version of the "spin-sdk" and "anyhow" (Flexible Error Types and a dependency of the Spin SDK) crates to the project by issuing:
+
+.. code-block:: bash
+
+   $ cargo add spin-sdk anyhow
+
+Before we implement the actual functionality, we must modify our **Cargo.toml** file. Open the **Cargo.toml** with an editor of your 
+choice and append the following to the bottom of your existing **Cargo.toml** file.
+
+.. code-block:: toml
+
+    [lib]
+    crate-type = ["cdylib"]
+
+    [package.metadata.component]
+    package = "component:test-component"
+    proxy = true
+
+    [package.metadata.component.dependencies]
+
+Next, replace the content of **src/lib.rs** file with the following code:
+
+.. code-block:: rust
+
+    use spin_sdk::http::{IntoResponse, Request, Response};
+    use spin_sdk::http_component;
+
+    #[http_component]
+    fn handle_hello_world(_req: Request) -> anyhow::Result<impl IntoResponse> {
+        let body_string = String::from("Hello, this is a Wasm Component using Spin SDK");
+
+        Ok(Response::builder()
+            .status(200)
+            .header("Content-Type", "text/plain")
+            .header("Content-Lenght", body_string.len().to_string())
+            .body(body_string)
+            .build())
+    }
+
+Compile the Rust Library into a Wasm Component using **cargo component**:
+
+.. code-block:: bash
+
+    $ cargo component build --release
+
+To run the Wasm Component on NGINX Unit, startup Unit and use this initial configuration.
+
+.. note:: Make sure you point to the Wasm component by using an absolute path. 
+
+.. code-block:: json
+
+    {
+        "listeners": {
+            "127.0.0.1:8085": {
+            "pass": "applications/my-spin-component"
+            }
+        },
+        "applications": {
+            "my-spin-component": {
+            "type": "wasm-wasi-component",
+            "component": "target/wasm32-wasi/release/test_spin_component.wasm"
+            }
+        }
+    }
+
+As the Wasm Component we have just crated uses the request and response interfaces defined by the **wasi:http/proxy** 
+it can easily be deployed on NGINX Unit.

source/news/2024/index.rst

@@ -4,6 +4,15 @@ News of 2024
 
 News archive for the year 2024.
 
+.. nxt_news_entry::
+   :author: Timo Stark
+   :description: Building Wasm Components using Feryon's Spin SDK for Rust
+                 and run them on NGINX Unit.
+   :email: unit-owner@nginx.org
+   :title: Wasm Components: Working with the Spin SDK for Rust
+   :url: news/2024/fermyon-spin-rust-sdk
+   :date: 2024-03-13
+
 .. nxt_news_entry::
    :author: Unit Team
    :description: Version 1.32.0 Adds Support for WebAssembly Components