feat: add heap snapshot

src/controllers/admin/info.js

@@ -143,3 +143,21 @@ async function getGitInfo() {
 	]);
 	return { hash: hash, hashShort: hash.slice(0, 6), branch: branch };
 }
+
+infoController.getHeapdump = async function (req, res) {
+	const v8 = require('v8');
+	const path = require('path');
+	const fs = require('fs');
+	const filename = path.join(nconf.get('upload_path'), `heapdump-${Date.now()}.heapsnapshot`);
+	const stored = v8.writeHeapSnapshot(filename, {});
+	res.download(stored, 'heapdump.heapsnapshot', (err) => {
+		if (err) {
+			winston.error(err.stack);
+		}
+		fs.unlink(stored, (unlinkErr) => {
+			if (unlinkErr) {
+				winston.error(unlinkErr.stack);
+			}
+		});
+	});
+};

src/routes/admin.js

@@ -81,6 +81,7 @@ function apiRoutes(router, name, middleware, controllers) {
 	router.get(`/api/${name}/groups/:groupname/csv`, middleware.ensureLoggedIn, helpers.tryRoute(controllers.admin.groups.getCSV));
 	router.get(`/api/${name}/analytics`, middleware.ensureLoggedIn, helpers.tryRoute(controllers.admin.dashboard.getAnalytics));
 	router.get(`/api/${name}/advanced/cache/dump`, middleware.ensureLoggedIn, helpers.tryRoute(controllers.admin.cache.dump));
+	router.get(`/api/${name}/advanced/heap/dump`, middleware.ensureLoggedIn, helpers.tryRoute(controllers.admin.info.getHeapdump));
 
 	const multer = require('multer');
 	const storage = multer.diskStorage({});

src/views/admin/development/info.tpl

@@ -5,7 +5,12 @@
 		</h5>
 
 		<div class="card-body">
-			<span>[[admin/development/info:nodes-responded, {nodeCount}, {timeout}]]</span>
+			<div class="d-flex flex-wrap justify-content-between align-items-center mb-2">
+				<span>[[admin/development/info:nodes-responded, {nodeCount}, {timeout}]]</span>
+				<a href="{config.relative_path}/api/admin/advanced/heap/dump" class="btn btn-primary btn-sm">
+					<i class="fa fa-download"></i> [[admin/development/info:heap-dump]]
+				</a>
+			</div>
 			<div class="table-responsive">
 				<table class="table table-sm text-sm">
 					<thead>