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# karyon jsonrpc
A fast and lightweight async implementation of [JSON-RPC
2.0](https://www.jsonrpc.org/specification).
features:
- Supports TCP, TLS, WebSocket, and Unix protocols.
- Uses `smol`(async-std) as the async runtime, but also supports `tokio` via the
`tokio` feature.
- Allows registration of multiple services (structs) of different types on a
single server.
- Supports pub/sub
- Allows passing an `async_executors::Executor` or tokio's `Runtime` when building
the server.
## Example
```rust
use std::sync::Arc;
use serde_json::Value;
use smol::stream::StreamExt;
use karyon_jsonrpc::{
Error, Server, Client, rpc_impl, rpc_pubsub_impl, SubscriptionID, ArcChannel
};
struct HelloWorld {}
#[rpc_impl]
impl HelloWorld {
async fn say_hello(&self, params: Value) -> Result<Value, Error> {
let msg: String = serde_json::from_value(params)?;
Ok(serde_json::json!(format!("Hello {msg}!")))
}
async fn foo(&self, params: Value) -> Result<Value, Error> {
Ok(serde_json::json!("foo!"))
}
async fn bar(&self, params: Value) -> Result<Value, Error> {
Ok(serde_json::json!("bar!"))
}
}
#[rpc_pubsub_impl]
impl HelloWorld {
async fn log_subscribe(&self, chan: ArcChannel, _params: Value) -> Result<Value, Error> {
let sub = chan.new_subscription().await;
let sub_id = sub.id.clone();
smol::spawn(async move {
loop {
smol::Timer::after(std::time::Duration::from_secs(1)).await;
if let Err(err) = sub.notify(serde_json::json!("Hello")).await {
println!("Error send notification {err}");
break;
}
}
})
.detach();
Ok(serde_json::json!(sub_id))
}
async fn log_unsubscribe(&self, chan: ArcChannel, params: Value) -> Result<Value, Error> {
let sub_id: SubscriptionID = serde_json::from_value(params)?;
chan.remove_subscription(&sub_id).await;
Ok(serde_json::json!(true))
}
}
// Server
async {
let service = Arc::new(HelloWorld {});
// Creates a new server
let server = Server::builder("tcp://127.0.0.1:60000")
.expect("create new server builder")
.service(service.clone())
.pubsub_service(service)
.build()
.await
.expect("build the server");
// Starts the server
server.start().await.expect("start the server");
};
// Client
async {
// Creates a new client
let client = Client::builder("tcp://127.0.0.1:60000")
.expect("create new client builder")
.build()
.await
.expect("build the client");
let result: String = client.call("HelloWorld.say_hello", "world".to_string())
.await
.expect("send a request");
let (sub_id, sub) = client
.subscribe("Calc.log_subscribe", ())
.await
.expect("Subscribe to log_subscribe method");
smol::spawn(async move {
sub.for_each(|m| {
println!("Receive new notification: {m}");
})
.await
})
.detach();
smol::Timer::after(std::time::Duration::from_secs(5)).await;
client
.unsubscribe("Calc.log_unsubscribe", sub_id)
.await
.expect("Unsubscribe from log_unsubscirbe method");
};
```
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