server: Use wtfnode to log reasons why node isn't exiting

package-lock.json

@@ -870,7 +870,8 @@
         "tinycon": "0.0.1",
         "ueberdb2": "^1.2.5",
         "underscore": "1.8.3",
-        "unorm": "1.4.1"
+        "unorm": "1.4.1",
+        "wtfnode": "^0.8.4"
       },
       "dependencies": {
         "@apidevtools/json-schema-ref-parser": {
@@ -10577,6 +10578,11 @@
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
       "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
     },
+    "wtfnode": {
+      "version": "0.8.4",
+      "resolved": "https://registry.npmjs.org/wtfnode/-/wtfnode-0.8.4.tgz",
+      "integrity": "sha512-64GEKtMt/MUBuAm+8kHqP74ojjafzu00aT0JKsmkIwYmjRQ/odO0yhbzKLm+Z9v1gMla+8dwITRKzTAlHsB+Og=="
+    },
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",

src/node/server.js

@@ -27,6 +27,10 @@
 const log4js = require('log4js');
 log4js.replaceConsole();
 
+// wtfnode should be loaded after log4js.replaceConsole() so that it uses log4js for logging, and it
+// should be above everything else so that it can hook in before resources are used.
+const wtfnode = require('wtfnode');
+
 /*
  * early check for version compatibility before calling
  * any modules that require newer versions of NodeJS
@@ -211,6 +215,7 @@ exports.exit = async (err = null) => {
   setTimeout(() => {
     console.error('Something that should have been cleaned up during the shutdown hook (such as ' +
                   'a timer, worker thread, or open connection) is preventing Node.js from exiting');
+    wtfnode.dump();
     console.error('Forcing an unclean exit...');
     process.exit(1);
   }, 5000).unref();

src/package-lock.json

@@ -8659,6 +8659,11 @@
       "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.2.tgz",
       "integrity": "sha512-T4tewALS3+qsrpGI/8dqNMLIVdq/g/85U98HPMa6F0m6xTbvhXU6RCQLqPH3+SlomNV/LdY6RXEbBpMH6EOJnA=="
     },
+    "wtfnode": {
+      "version": "0.8.4",
+      "resolved": "https://registry.npmjs.org/wtfnode/-/wtfnode-0.8.4.tgz",
+      "integrity": "sha512-64GEKtMt/MUBuAm+8kHqP74ojjafzu00aT0JKsmkIwYmjRQ/odO0yhbzKLm+Z9v1gMla+8dwITRKzTAlHsB+Og=="
+    },
     "xml2js": {
       "version": "0.4.23",
       "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.4.23.tgz",

src/package.json

@@ -72,7 +72,8 @@
     "tinycon": "0.0.1",
     "ueberdb2": "^1.2.5",
     "underscore": "1.8.3",
-    "unorm": "1.4.1"
+    "unorm": "1.4.1",
+    "wtfnode": "^0.8.4"
   },
   "bin": {
     "etherpad-lite": "node/server.js"