feat: implement basic music player and grpc server

src/grpc.rs

@@ -3,8 +3,8 @@ use std::net::{SocketAddr, TcpListener};
 
 use tonic::async_trait;
 
-use self::client::GRPCClient;
-use self::server::GRPCServer;
+pub use self::client::GRPCClient;
+pub use self::server::GRPCServer;
 
 mod client;
 mod server;
@@ -18,20 +18,10 @@ pub trait Connection {
     async fn connect(&self) -> Result<(), Box<dyn Error>>;
 }
 
-fn is_socket_in_use(addr: String) -> bool {
-    let socket: SocketAddr = addr.parse().expect("Failed to create socket");
-    match TcpListener::bind(socket) {
-        Ok(_) => true,
-        Err(_) => false,
-    }
-}
-
-pub fn run() -> Result<Box<dyn Connection>, Box<dyn Error>> {
-    let addr = "[::1]:50051";
-
-    if is_socket_in_use(addr.to_string()) {
-        Ok(Box::new(GRPCServer::new(addr.to_string())))
-    } else {
-        Ok(Box::new(GRPCClient::new(addr.to_string())))
+/// Return true if the addr is already in use, false otherwise
+pub fn is_socket_in_use(addr: SocketAddr) -> bool {
+    match TcpListener::bind(addr) {
+        Ok(_) => false,
+        Err(_) => true,
     }
 }