Handle exception about unserializable route cache (#11625)

* Handle exception about unserializable route cache

* description

* Fix whitespace

LibreNMS/Exceptions/UnserializableRouteCache.php

@@ -0,0 +1,81 @@
+<?php
+/**
+ * UnserializableRouteCache.php
+ *
+ * This error is caused when the route cache is generated by an newer version of PHP than the one that loads it
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @package    LibreNMS
+ * @link       http://librenms.org
+ * @copyright  2020 Tony Murray
+ * @author     Tony Murray <murraytony@gmail.com>
+ */
+
+namespace LibreNMS\Exceptions;
+
+use LibreNMS\Interfaces\Exceptions\UpgradeableException;
+use Throwable;
+
+class UnserializableRouteCache extends \Exception implements UpgradeableException
+{
+    protected $cli_php_version;
+    protected $web_php_version;
+
+    public function __construct($message = "", $code = 0, Throwable $previous = null, $cli_php_version = null, $web_php_version = null)
+    {
+        $this->cli_php_version = $cli_php_version;
+        $this->web_php_version = $web_php_version;
+        parent::__construct($message, $code, $previous);
+    }
+
+    /**
+     * Try to convert the given Exception to this exception
+     *
+     * @param \Exception $exception
+     * @return static
+     */
+    public static function upgrade($exception)
+    {
+        $errorMessage = "Erroneous data format for unserializing 'Symfony\Component\Routing\CompiledRoute'";
+        if ($exception instanceof \ErrorException && $exception->message == $errorMessage) {
+            $cli = rtrim(shell_exec('php -r "echo PHP_VERSION;"'));
+            if (version_compare($cli, PHP_VERSION, '!=')) {
+                return new static($exception->getMessage(), $exception->getCode(), $exception, $cli, PHP_VERSION);
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Render the exception into an HTTP or JSON response.
+     *
+     * @param \Illuminate\Http\Request
+     * @return \Illuminate\Http\Response|\Symfony\Component\HttpFoundation\Response
+     */
+    public function render(\Illuminate\Http\Request $request)
+    {
+        $title = __('Error caused by PHP version mismatch');
+        $message = __('The version of PHP your webserver is running (:web_version) does not match the CLI version (:cli_version).', ['cli_version' => $this->cli_php_version, 'web_version' => $this->web_php_version]);
+
+        return $request->wantsJson() ? response()->json([
+            'status' => 'error',
+            'message' => "$title: $message",
+        ]) : response()->view('errors.generic', [
+            'title' => $title,
+            'content' => $message,
+        ]);
+    }
+}

app/Exceptions/Handler.php

@@ -31,6 +31,7 @@ class Handler extends ExceptionHandler
         \LibreNMS\Exceptions\FilePermissionsException::class,
         \LibreNMS\Exceptions\DatabaseConnectException::class,
         \LibreNMS\Exceptions\DuskUnsafeException::class,
+        \LibreNMS\Exceptions\UnserializableRouteCache::class,
     ];
 
     public function render($request, Exception $exception)