From 4aa1ad89a0e2d489bc6b85ab3291719e080757ad Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Mon, 25 Jul 2022 21:45:41 -0700
Subject: socket reconnection logic

---
 src/lib/socket.js | 43 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

(limited to 'src/lib/socket.js')

diff --git a/src/lib/socket.js b/src/lib/socket.js
index 978c053a..0360acd5 100644
--- a/src/lib/socket.js
+++ b/src/lib/socket.js
@@ -1,4 +1,4 @@
-import { rate } from "$lib/store";
+import { rate, ws } from '$lib/store';
 export const messages = (data) => ({
 	rate() {
 		rate.set(data);
@@ -8,3 +8,44 @@ export const messages = (data) => ({
 		console.log(data);
 	}
 });
+
+const token =
+	'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImJvYiIsImlhdCI6MTY1ODc5NDkxMX0._zFTEADrbLffcXa5sIMrJtJ483VdIiYmsdt2ofibxu4';
+const initialReconnectDelay = 1000;
+const maxReconnectDelay = 16000;
+
+let currentReconnectDelay = initialReconnectDelay;
+let socket;
+
+export function connect() {
+	socket = new WebSocket('ws://localhost:3119/ws');
+	socket.addEventListener('open', onWebsocketOpen);
+	socket.addEventListener('close', onWebsocketClose);
+	socket.addEventListener('message', onWebsocketMessage);
+
+	ws.set(socket);
+}
+
+function onWebsocketMessage(msg) {
+	let { type, data } = JSON.parse(msg.data);
+	messages(data)[type] && messages(data)[type]();
+}
+
+function onWebsocketOpen() {
+	currentReconnectDelay = initialReconnectDelay;
+	socket.send(JSON.stringify({ type: 'login', data: token }));
+}
+
+function onWebsocketClose() {
+	ws.set(null);
+	setTimeout(() => {
+		reconnectToWebsocket();
+	}, currentReconnectDelay + Math.floor(Math.random() * 3000));
+}
+
+function reconnectToWebsocket() {
+	if (currentReconnectDelay < maxReconnectDelay) {
+		currentReconnectDelay *= 2;
+	}
+	connect();
+}
-- 
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