From ce31bef8a125c5492f2a1cfef0dcf3d8a4e9ee11 Mon Sep 17 00:00:00 2001
From: Danshil Kokil Mungur <me@danshilm.com>
Date: Thu, 20 Jan 2022 09:17:03 +0400
Subject: [PATCH] feat(logs): use separate json file to parse logs for log
 viewer (#2399)

Co-authored-by: Ryan Cohen <ryan@sct.dev>
---
 server/logger.ts                | 20 ++++++++++--
 server/routes/settings/index.ts | 56 +++++++++++++++++++--------------
 2 files changed, 50 insertions(+), 26 deletions(-)

diff --git a/server/logger.ts b/server/logger.ts
index 824de630..4f736e4a 100644
--- a/server/logger.ts
+++ b/server/logger.ts
@@ -1,7 +1,7 @@
+import fs from 'fs';
+import path from 'path';
 import * as winston from 'winston';
 import 'winston-daily-rotate-file';
-import path from 'path';
-import fs from 'fs';
 
 // Migrate away from old log
 const OLD_LOG_FILE = path.join(__dirname, '../config/logs/overseerr.log');
@@ -52,6 +52,22 @@ const logger = winston.createLogger({
       createSymlink: true,
       symlinkName: 'overseerr.log',
     }),
+    new winston.transports.DailyRotateFile({
+      filename: process.env.CONFIG_DIRECTORY
+        ? `${process.env.CONFIG_DIRECTORY}/logs/.machinelogs-%DATE%.json`
+        : path.join(__dirname, '../config/logs/.machinelogs-%DATE%.json'),
+      datePattern: 'YYYY-MM-DD',
+      zippedArchive: true,
+      maxSize: '20m',
+      maxFiles: '1d',
+      createSymlink: true,
+      symlinkName: '.machinelogs.json',
+      format: winston.format.combine(
+        winston.format.splat(),
+        winston.format.timestamp(),
+        winston.format.json()
+      ),
+    }),
   ],
 });
 
diff --git a/server/routes/settings/index.ts b/server/routes/settings/index.ts
index c9908f4a..c07232e4 100644
--- a/server/routes/settings/index.ts
+++ b/server/routes/settings/index.ts
@@ -303,38 +303,46 @@ settingsRoutes.get(
     }
 
     const logFile = process.env.CONFIG_DIRECTORY
-      ? `${process.env.CONFIG_DIRECTORY}/logs/overseerr.log`
-      : path.join(__dirname, '../../../config/logs/overseerr.log');
+      ? `${process.env.CONFIG_DIRECTORY}/logs/.machinelogs.json`
+      : path.join(__dirname, '../../../config/logs/.machinelogs.json');
     const logs: LogMessage[] = [];
+    const logMessageProperties = [
+      'timestamp',
+      'level',
+      'label',
+      'message',
+      'data',
+    ];
 
     try {
-      fs.readFileSync(logFile)
-        .toString()
-        .split(/(?=\n\d{4}-\d{2})/g)
+      fs.readFileSync(logFile, 'utf-8')
+        .split('\n')
         .forEach((line) => {
           if (!line.length) return;
 
-          const jsonRegexp = new RegExp(
-            /[{[]{1}([,:{}[\]0-9.\-+Eaeflnr-u \n\r\t]|"[^"\n]*?")+[}\]]{1}/
-          );
+          const logMessage = JSON.parse(line);
 
-          const timestamp = line.match(new RegExp(/.{24}/)) || [];
-          const level = line.match(new RegExp(/(?<=.{24}\s\[).+?(?=\])/)) || [];
-          const label =
-            line.match(new RegExp(/(?<=.{24}\s\[.+\]\[).+?(?=\])/)) || [];
-          const message =
-            line.match(new RegExp(/(?<=\[.+\]:\s)[\s\S][^\r]+/)) || [];
-          const data = message[0].match(jsonRegexp) || [];
-
-          if (level.length && filter.includes(level[0])) {
-            logs.push({
-              timestamp: timestamp[0],
-              level: level[0],
-              label: label[0],
-              message: message[0].replace(jsonRegexp, ''),
-              data: data.length ? JSON.parse(data[0]) : undefined,
-            });
+          if (!filter.includes(logMessage.level)) {
+            return;
           }
+
+          if (
+            !Object.keys(logMessage).every((key) =>
+              logMessageProperties.includes(key)
+            )
+          ) {
+            Object.keys(logMessage)
+              .filter((prop) => !logMessageProperties.includes(prop))
+              .forEach((prop) => {
+                Object.assign(logMessage, {
+                  data: {
+                    [prop]: logMessage[prop],
+                  },
+                });
+              });
+          }
+
+          logs.push(logMessage);
         });
 
       const displayedLogs = logs.reverse().slice(skip, skip + pageSize);