connection: fix some edge cases

src/lib/transport/Connection.mjs

@@ -15,9 +15,13 @@ import { encrypt_bytes, decrypt_bytes } from '../crypto/secretbox.mjs';
  * Represents a connection to a single endpoint.
  */
 class Connection extends EventEmitter {
-	constructor(secret_join) {
+	constructor(secret_join, socket) {
 		super();
 		
+		this.socket = socket;
+		
+		this.rekey_last = null;
+		this.rekey_interval = 30 * 60 * 1000; // 30 minutes
 		this.session_key = Buffer.from(secret_join, "base64");
 	}
 	
@@ -34,9 +38,14 @@ class Connection extends EventEmitter {
 			address, port
 		});
 		await once(this.socket, "connect");
+		
+		await this.init();
+	}
+	
+	async init() {
 		this.socket.setKeepAlive(true);
 		
-		this.session_key = await rekey(this.socket, this.session_key);
+		await this.rekey();
 		
 		this.framer = new FramedTransport(this.socket);
 		this.framer.on("frame", this.handle_frame);
@@ -44,8 +53,13 @@ class Connection extends EventEmitter {
 		this.read_task = read_loop();
 	}
 	
-	destroy() {
-		this.socket.destroy();
+	async rekey() {
+		this.rekey_last = new Date();
+		this.session_key = await rekey(this.socket, this.session_key);
+	}
+	
+	async destroy() {
+		await this.framer.destroy();
 		this.emit("destroy");
 	}
 	
@@ -69,14 +83,28 @@ class Connection extends EventEmitter {
 	}
 	
 	async send(message) {
-		// TODO: Implement a binary frame-based protocol here instead? It would be 33% more bandwidth efficient.
-		// Perhaps <length> <data>? If messages are too long, we'll have to do something about that though....
+		if(new Date() - this.rekey_last > this.rekey_interval)
+			await this.rekey();
+		
 		// TODO: Consider https://devdocs.io/node/crypto#crypto.createCipheriv() - which lets us use any openssl ciphers we like - e.g. ChaCha20-Poly1305
 		let payload = JSON.stringify(message);
 		payload = encrypt_bytes(this.session_key, payload);
 		
-		await this., payload);
+		
+		await this.framer.write(payload);
 	}
 }
 
+Connection.Wrap = async function(secret_join, socket) {
+	const socket = new Connection(secret_join, socket);
+	await socket.init();
+	
+	return socket;
+}
+
+Connection.Create = async function(secret_join, address, port) {
+	const socket = new Connection(secret_join);
+	socket.connect(address, port);
+}
+
 export default Connection;