From 21c713255c04d8f489cfbcb098d386ed244132b2 Mon Sep 17 00:00:00 2001
From: Dragory <dragory.up@gmail.com>
Date: Sun, 5 Aug 2018 00:45:35 +0300
Subject: [PATCH] LogServer: retry starting the web server if it fails due to
 EADDRINUSE (probably old instance of the bot still shutting down)

---
 src/plugins/LogServer.ts | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/plugins/LogServer.ts b/src/plugins/LogServer.ts
index ee41c958..69c123fd 100644
--- a/src/plugins/LogServer.ts
+++ b/src/plugins/LogServer.ts
@@ -1,6 +1,7 @@
 import http, { ServerResponse } from "http";
 import { GlobalPlugin } from "knub";
 import { GuildSpamLogs } from "../data/GuildSpamLogs";
+import { sleep } from "../utils";
 
 const DEFAULT_PORT = 9920;
 const logUrlRegex = /^\/spam-logs\/([a-z0-9\-]+)\/?$/i;
@@ -17,7 +18,7 @@ export class LogServerPlugin extends GlobalPlugin {
   protected spamLogs: GuildSpamLogs;
   protected server: http.Server;
 
-  onLoad() {
+  async onLoad() {
     this.spamLogs = new GuildSpamLogs(null);
 
     this.server = http.createServer(async (req, res) => {
@@ -33,6 +34,19 @@ export class LogServerPlugin extends GlobalPlugin {
       }
     });
 
+    let retried = false;
+
+    this.server.on("error", async (err: any) => {
+      if (err.code === "EADDRINUSE" && !retried) {
+        console.log("Got EADDRINUSE, retrying in 2 sec...");
+        retried = true;
+        await sleep(2000);
+        this.server.listen(this.configValue("port", DEFAULT_PORT));
+      } else {
+        throw err;
+      }
+    });
+
     this.server.listen(this.configValue("port", DEFAULT_PORT));
   }