feat: ability to clear cache from acp

public/src/admin/advanced/cache.js

@@ -0,0 +1,20 @@
+'use strict';
+
+define('admin/advanced/cache', function () {
+	var Cache = {};
+	Cache.init = function () {
+		require(['admin/settings'], function (Settings) {
+			Settings.prepare();
+		});
+
+		$('#clear').on('click', function () {
+			socket.emit('admin.cache.clear', function (err) {
+				if (err) {
+					return app.alertError(err.message);
+				}
+				ajaxify.refresh();
+			});
+		});
+	};
+	return Cache;
+});

src/controllers/admin/cache.js

@@ -45,7 +45,7 @@ cacheController.get = function (req, res) {
 			dump: req.query.debug ? JSON.stringify(localCache.dump(), null, 4) : false,
 			hits: utils.addCommas(String(localCache.hits)),
 			misses: utils.addCommas(String(localCache.misses)),
-			hitRatio: (localCache.hits / (localCache.hits + localCache.misses)).toFixed(4),
+			hitRatio: ((localCache.hits / (localCache.hits + localCache.misses) || 0)).toFixed(4),
 		},
 	};
 

src/socket.io/admin.js

@@ -32,6 +32,7 @@ SocketAdmin.logs = require('./admin/logs');
 SocketAdmin.errors = require('./admin/errors');
 SocketAdmin.uploads = require('./admin/uploads');
 SocketAdmin.digest = require('./admin/digest');
+SocketAdmin.cache = require('./admin/cache');
 
 SocketAdmin.before = async function (socket, method) {
 	const isAdmin = await user.isAdministrator(socket.uid);

src/socket.io/admin/cache.js

@@ -0,0 +1,10 @@
+'use strict';
+
+const SocketCache = module.exports;
+
+SocketCache.clear = async function () {
+	require('../../posts/cache').reset();
+	require('../../database').objectCache.reset();
+	require('../../groups').cache.reset();
+	require('../../cache').reset();
+};

src/views/admin/advanced/cache.tpl

@@ -106,14 +106,9 @@
 		<div class="panel panel-default">
 			<div class="panel-heading">[[admin/advanced/cache:control-panel]]</div>
 			<div class="panel-body">
-				<button class="btn btn-primary" id="save">[[admin/advanced/cache:update-settings]]</button>
+				<button class="btn btn-primary btn-block" id="save">[[admin/advanced/cache:update-settings]]</button>
+				<button class="btn btn-info btn-block" id="clear">[[admin/advanced/cache:clear]]</button>
 			</div>
 		</div>
 	</div>
 </div>
-
-<script>
-	require(['admin/settings'], function(Settings) {
-		Settings.prepare();
-	});
-</script>