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use std::{future::Future, pin::Pin};
use crate::Result;
/// Represents the RPC method
pub type RPCMethod<'a> = Box<dyn Fn(serde_json::Value) -> RPCMethodOutput<'a> + Send + 'a>;
type RPCMethodOutput<'a> =
Pin<Box<dyn Future<Output = Result<serde_json::Value>> + Send + Sync + 'a>>;
/// Defines the interface for an RPC service.
pub trait RPCService: Sync + Send {
fn get_method<'a>(&'a self, name: &'a str) -> Option<RPCMethod>;
fn name(&self) -> String;
}
/// Implements the [`RPCService`] trait for a provided type.
///
/// # Example
///
/// ```
/// use serde_json::Value;
///
/// use karyon_jsonrpc::{JsonRPCError, register_service};
///
/// struct Hello {}
///
/// impl Hello {
/// async fn foo(&self, params: Value) -> Result<Value, JsonRPCError> {
/// Ok(serde_json::json!("foo!"))
/// }
///
/// async fn bar(&self, params: Value) -> Result<Value, JsonRPCError> {
/// Ok(serde_json::json!("bar!"))
/// }
/// }
///
/// register_service!(Hello, foo, bar);
///
/// ```
#[macro_export]
macro_rules! register_service {
($t:ty, $($m:ident),*) => {
impl karyon_jsonrpc::RPCService for $t {
fn get_method<'a>(
&'a self,
name: &'a str
) -> Option<karyon_jsonrpc::RPCMethod> {
match name {
$(
stringify!($m) => {
Some(Box::new(move |params: serde_json::Value| Box::pin(self.$m(params))))
}
)*
_ => None,
}
}
fn name(&self) -> String{
stringify!($t).to_string()
}
}
};
}
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