readme: added examples

readme.md

@@ -1,5 +1,158 @@
-# A Rabbit-worker & client
+<center> <h1> BunBun-Worker </h1> </center>
 
-A rust crate to work with RPC and nonRPC calls using rabbitmq.
+A multithreaded _panic-safe_ job runner built on the AMQP. Bunbun-worker features RPC and nonRPC calls, and can handle multiple types of messages at a time.
 
-TODO description...
+> ❗ Disclaimer  
+> This crate is still under development, meaning api's may change on every commit...
+
+## Installation
+
+Since this package is not published to crates.io you will need to add it manually to `Cargo.toml`
+
+```toml
+[dependencies]
+bunbun-worker = { git = "https://git.4o1x5.dev/4o1x5/bunbun-worker", version = "0.12" }
+```
+
+or
+
+```toml
+[dependencies]
+bunbun-worker = { git = "https://git.4o1x5.dev/4o1x5/bunbun-worker", branch = "main" }
+```
+
+## Motivation
+
+I have a project called _Mediarose_ in development and I needed a way to have efficient and simple communication between services to kill of circular dependencies.
+
+## Usage
+
+Here is a basic implementation of an RPC job in bunbun-worker
+
+```rust
+// server
+
+// First let's create a state that will be used inside a job.
+// Imagine this holding a database connection, some context that may need to be changed. Anything really
+#[derive(Clone, Debug)]
+pub struct State {
+    pub something: String,
+}
+
+/// Second, let's create a job, with field that can be serialized/deserialized into JSON
+/// This is what the server will receive from a client and will do the job based on these properties
+#[derive(Deserialize, Serialize, Clone, Debug)]
+pub struct EmailJob {
+    send_to: String,
+    contents: String,
+}
+// We also create a result for it, since it's an RPC job
+#[derive(Deserialize, Serialize, Clone, Debug, PartialEq)]
+pub struct EmailJobResult {
+    contents: String,
+}
+// And an error type so know if the other end errored out, what to do.
+#[derive(Deserialize, Serialize, Clone, Debug)]
+pub enum EmailJobResultError {
+    Errored,
+}
+
+/// After all this we implement a Jobrunner/Taskrunner to the type, so when the listener receives it, it can run this piece of code.
+impl RPCServerTask for EmailJob {
+    type ErroredResult = EmailJobResultError;
+    type Result = EmailJobResult;
+    type State = State;
+    fn run(
+        self,
+        state: Arc<Mutex<Self::State>>,
+    ) -> futures::prelude::future::BoxFuture<'static, Result<Self::Result, Self::ErroredResult>>
+    {
+        Box::pin(async move {
+            tracing::info!("Sent email to {}", self.send_to);
+            tokio::time::sleep(Duration::from_secs(2)).await;
+            return Ok(EmailJobResult {
+                contents: self.contents.clone(),
+            });
+        })
+    }
+}
+// Finally, we can define an async main function to run the listener in.
+#[tokio::main]
+async fn main(){
+    // Define a listener, with a hard-limit of 100 jobs at once.
+    let mut listener =
+        BunBunWorker::new(env::var("AMQP_SERVER_URL").unwrap(), 100.into()).await;
+    // Add the defined sturct to the worker
+    listener
+        .add_rpc_consumer::<EmailJob>(
+            "email-emailjob-v1.0.0", // queue name
+            "emailjob", // consumer tag
+            Arc::new(Mutex::new(State {
+                something: "test".into(), // putting our state into a Arc<Mutex<S>> for thread safety
+            })),
+        )
+        .await;
+    tracing::debug!("Starting listener");
+    // Starting the listener
+    listener.start_all_listeners().await;
+}
+```
+
+```rust
+// client
+
+// Define the same structs we did. These are DTO's after all..
+#[derive(Deserialize, Serialize, Clone, Debug)]
+pub struct EmailJob {
+    send_to: String,
+    contents: String,
+}
+#[derive(Deserialize, Serialize, Clone, Debug, PartialEq)]
+pub struct EmailJobResult {
+    contents: String,
+}
+#[derive(Deserialize, Serialize, Clone, Debug)]
+pub enum EmailJobResultError {
+    Errored,
+}
+// Now we implement the clientside task for it. This reduces generics when defining the calling..
+impl RPCClientTask for EmailJob {
+    type ErroredResult = EmailJobResultError;
+    type Result = EmailJobResult;
+}
+
+#[tokio::main]
+async fn main(){
+// Define a client
+  let mut client = BunBunClient::new(env::var("AMQP_SERVER_URL").unwrap().as_str())
+      .await
+      .unwrap();
+  // Make a call
+  let result = client
+      .rpc_call::<EmailJob>(
+            // Define the job
+          EmailJob {
+              send_to: "someone".into(),
+              contents: "something".into(),
+          },
+          "email-emailjob-v1.0.0", // the queue name
+      )
+      .await
+      .unwrap();
+}
+```
+
+## License
+
+Licensed under [GNU AFFERO GENERAL PUBLIC LICENSE](https://www.gnu.org/licenses/agpl-3.0.en.html)
+
+### Contribution
+
+Currently this library does not accept any contributors, as it's hosted on a private registry and git server.
+
+# Credits
+
+This package was made with the help of-
+
+- [This readme template you are reading right now](https://github.com/webern/cargo-readme/blob/master/README.md)
+- [Lapin, an extensive easy to use rabbitmq client](https://crates.io/crates/lapin)