feat: add __rpc

__rpc/dubbo-rust/src/greeter/server.rs

@@ -0,0 +1,46 @@
+use dubbo::codegen::{Request, Response};
+use dubbo::Dubbo;
+use dubbo_config::RootConfig;
+use crate::sample::greeter_server::{Greeter, register_server};
+use crate::sample::{GreeterReply, GreeterRequest};
+
+mod sample;
+
+#[tokio::main]
+async fn main() {
+    register_server(GreeterServerImpl {
+        name: "greeter".to_string(),
+    });
+
+    Dubbo::new()
+        .with_config({
+            let r = RootConfig::new();
+            match r.load() {
+                Ok(config) => config,
+                Err(_err) => panic!("err: {:?}", _err), // response was droped
+            }
+        })
+        .start()
+        .await;
+}
+
+#[allow(dead_code)]
+#[derive(Default, Clone)]
+struct GreeterServerImpl {
+    name: String,
+}
+
+#[async_trait::async_trait]
+impl Greeter for GreeterServerImpl {
+    async fn greet(
+        &self,
+        request: Request<GreeterRequest>,
+    ) -> Result<Response<GreeterReply>, dubbo::status::Status> {
+        println!("GreeterServer::greet {:?}", request.metadata);
+
+        Ok(Response::new(GreeterReply {
+            message: "hello, dubbo-rust".to_string(),
+        }))
+    }
+}
+