From 959dbbd7bf655e9a36a310838dae75b9909f0096 Mon Sep 17 00:00:00 2001
From: Chocobozzz <me@florianbigard.com>
Date: Tue, 5 Nov 2019 11:08:51 +0100
Subject: Avoid circular error in logger

---
 server/helpers/logger.ts | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

(limited to 'server/helpers/logger.ts')

diff --git a/server/helpers/logger.ts b/server/helpers/logger.ts
index 8603dd761..d21746963 100644
--- a/server/helpers/logger.ts
+++ b/server/helpers/logger.ts
@@ -12,22 +12,33 @@ const label = CONFIG.WEBSERVER.HOSTNAME + ':' + CONFIG.WEBSERVER.PORT
 // FIXME: use async
 mkdirpSync(CONFIG.STORAGE.LOG_DIR)
 
-function loggerReplacer (key: string, value: any) {
-  if (value instanceof Error) {
-    const error = {}
+function getLoggerReplacer () {
+  const seen = new WeakSet()
 
-    Object.getOwnPropertyNames(value).forEach(key => error[ key ] = value[ key ])
+  // Thanks: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cyclic_object_value#Examples
+  return (key: string, value: any) => {
+    if (typeof value === 'object' && value !== null) {
+      if (seen.has(value)) return
 
-    return error
-  }
+      seen.add(value)
+    }
+
+    if (value instanceof Error) {
+      const error = {}
+
+      Object.getOwnPropertyNames(value).forEach(key => error[ key ] = value[ key ])
 
-  return value
+      return error
+    }
+
+    return value
+  }
 }
 
 const consoleLoggerFormat = winston.format.printf(info => {
   const obj = omit(info, 'label', 'timestamp', 'level', 'message')
 
-  let additionalInfos = JSON.stringify(obj, loggerReplacer, 2)
+  let additionalInfos = JSON.stringify(obj, getLoggerReplacer(), 2)
 
   if (additionalInfos === undefined || additionalInfos === '{}') additionalInfos = ''
   else additionalInfos = ' ' + additionalInfos
@@ -36,7 +47,7 @@ const consoleLoggerFormat = winston.format.printf(info => {
 })
 
 const jsonLoggerFormat = winston.format.printf(info => {
-  return JSON.stringify(info, loggerReplacer)
+  return JSON.stringify(info, getLoggerReplacer())
 })
 
 const timestampFormatter = winston.format.timestamp({
@@ -47,7 +58,6 @@ const labelFormatter = winston.format.label({
 })
 
 const fileLoggerOptions: FileTransportOptions = {
-
   filename: path.join(CONFIG.STORAGE.LOG_DIR, 'peertube.log'),
   handleExceptions: true,
   format: winston.format.combine(
-- 
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