♻️ refactor: continue extracting end server struct

prototypes/quic_demo/src/executable_end_server.rs

@@ -19,41 +19,59 @@ struct Opt {
 pub async fn main (args: &[OsString]) -> anyhow::Result <()> {
 	let opt = Arc::new (Opt::from_iter (args));
 	
-	let server_cert: Vec <u8> = match opt.cert_url.as_ref () {
+	let relay_cert: Vec <u8> = match opt.cert_url.as_ref () {
 		Some (url) => reqwest::get (url).await?.bytes ().await?.into_iter ().collect (),
 		None => tokio::fs::read ("quic_server.crt").await?,
 	};
 	let relay_addr: SocketAddr = opt.relay_addr.clone ().unwrap_or_else (|| String::from ("127.0.0.1:30380")).parse ()?;
 	
-	let end_server = P4EndServer {
+	let id = opt.server_id.clone ().unwrap_or_else (|| "bogus_server".to_string ());
-		relay_addr: relay_addr,
-		server_cert: server_cert,
-	};
 	
-	let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&end_server.server_cert])?;
+	let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&relay_cert])?;
 	
 	trace! ("Connecting to relay server");
 	
-	let server_id = opt.server_id.clone ().unwrap_or_else (|| "bogus_server".to_string ());
-	
 	let quinn::NewConnection {
-		mut bi_streams,
+		bi_streams,
 		..
-	} = protocol::p4_connect_to_p3 (&endpoint, &end_server.relay_addr, &server_id).await?;
+	} = protocol::p4_connect_to_p3 (&endpoint, &relay_addr, &id).await?;
+	
+	let mut end_server = P4EndServer {
+		bi_streams,
+		id,
+		relay_addr,
+		relay_cert,
+	};
 	
 	debug! ("Connected to relay server");
 	trace! ("Accepting bi streams from P3");
 	
 	loop {
-		let (relay_send, relay_recv) = bi_streams.next ().await.ok_or_else (|| anyhow::anyhow! ("Relay server didn't open a bi stream"))??;
+		let (relay_send, relay_recv) = end_server.bi_streams.next ().await.ok_or_else (|| anyhow::anyhow! ("Relay server didn't open a bi stream"))??;
 		
 		tokio::spawn (handle_bi_stream (Arc::clone (&opt), relay_send, relay_recv));
 	}
 }
 
-struct P4EndServer {
+pub struct P4EndServer {
+	bi_streams: quinn::IncomingBiStreams,
+	id: String,
 	relay_addr: SocketAddr,
-	server_cert: Vec <u8>,
+	relay_cert: Vec <u8>,
+}
+
+impl P4EndServer {
+	pub fn id (&self) -> &str {
+		&self.id
+	}
+	
+	pub fn relay_addr (&self) -> SocketAddr {
+		self.relay_addr
+	}
+	
+	pub fn relay_cert (&self) -> &[u8] {
+		&self.relay_cert
+	}
 }
 
 async fn handle_bi_stream (