From d7f7dba13ff326d0b236ce539418b2de469c52ff Mon Sep 17 00:00:00 2001
From: Louis <louislam@users.noreply.github.com>
Date: Fri, 29 Oct 2021 18:24:47 +0800
Subject: [PATCH] write some error logs to ./data/error.log

---
 server/model/monitor.js |  3 ++-
 server/server.js        |  3 ++-
 server/util-server.js   | 17 +++++++++++++++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/server/model/monitor.js b/server/model/monitor.js
index a1aa1656..fc329231 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -7,7 +7,7 @@ dayjs.extend(timezone);
 const axios = require("axios");
 const { Prometheus } = require("../prometheus");
 const { debug, UP, DOWN, PENDING, flipStatus, TimeLogger } = require("../../src/util");
-const { tcping, ping, dnsResolve, checkCertificate, checkStatusCode, getTotalClientInRoom, setting } = require("../util-server");
+const { tcping, ping, dnsResolve, checkCertificate, checkStatusCode, getTotalClientInRoom, setting, errorLog } = require("../util-server");
 const { R } = require("redbean-node");
 const { BeanModel } = require("redbean-node/dist/bean-model");
 const { Notification } = require("../notification");
@@ -404,6 +404,7 @@ class Monitor extends BeanModel {
                 await beat();
             } catch (e) {
                 console.trace(e);
+                errorLog(e, false);
                 console.error("Please report to https://github.com/louislam/uptime-kuma/issues");
 
                 if (! this.isStop) {
diff --git a/server/server.js b/server/server.js
index 324ae677..fe0d2e66 100644
--- a/server/server.js
+++ b/server/server.js
@@ -41,7 +41,7 @@ console.log("Importing this project modules");
 debug("Importing Monitor");
 const Monitor = require("./model/monitor");
 debug("Importing Settings");
-const { getSettings, setSettings, setting, initJWTSecret, checkLogin, startUnitTest, FBSD } = require("./util-server");
+const { getSettings, setSettings, setting, initJWTSecret, checkLogin, startUnitTest, FBSD, errorLog } = require("./util-server");
 
 debug("Importing Notification");
 const { Notification } = require("./notification");
@@ -1529,5 +1529,6 @@ gracefulShutdown(server, {
 // Catch unexpected errors here
 process.addListener("unhandledRejection", (error, promise) => {
     console.trace(error);
+    errorLog(error, false);
     console.error("If you keep encountering errors, please report to https://github.com/louislam/uptime-kuma/issues");
 });
diff --git a/server/util-server.js b/server/util-server.js
index 7be922dd..2ed6889b 100644
--- a/server/util-server.js
+++ b/server/util-server.js
@@ -8,6 +8,8 @@ const { Resolver } = require("dns");
 const child_process = require("child_process");
 const iconv = require("iconv-lite");
 const chardet = require("chardet");
+const fs = require("fs");
+const nodeJsUtil = require("util");
 
 // From ping-lite
 exports.WIN = /^win/.test(process.platform);
@@ -332,3 +334,18 @@ exports.convertToUTF8 = (body) => {
     const str = iconv.decode(body, guessEncoding);
     return str.toString();
 };
+
+let logFile = fs.createWriteStream("./data/error.log", {
+    flags: "a"
+});
+
+exports.errorLog = (error, outputToConsole = true) => {
+    try {
+        const dateTime = R.isoDateTime();
+        logFile.write(`[${dateTime}] ` + nodeJsUtil.format(error) + "\n");
+
+        if (outputToConsole) {
+            console.error(error);
+        }
+    } catch (_) { }
+};