Add backward compatibility for older Memcached with lru_crawler disabled

Author: RobiNN1

src/Dashboards/Memcached/MemcachedTrait.php

@@ -244,7 +244,7 @@ private function keysTableView(array $keys): array {
                 'info' => [
                     'link_title'           => urldecode($key_data['key']),
                     'bytes_size'           => $key_data['size'],
-                    'timediff_last_access' => $key_data['la'],
+                    'timediff_last_access' => $key_data['la'] !== 0 ? $key_data['la'] : null,
                     'ttl'                  => $key_data['ttl'],
                 ],
             ];
@@ -257,9 +257,16 @@ private function keysTableView(array $keys): array {
      * @param array<int|string, mixed> $keys
      *
      * @return array<int, array<string, string|int>>
+     *
+     * @throws MemcachedException
      */
     private function keysTreeView(array $keys): array {
-        $separator = urlencode($this->servers[$this->current_server]['separator'] ?? ':');
+        $separator = $this->servers[$this->current_server]['separator'] ?? ':';
+
+        if (version_compare($this->memcached->version(), '1.5.19', '>=')) {
+            $separator = urlencode($separator);
+        }
+
         $this->template->addGlobal('separator', urldecode($separator));
 
         $tree = [];
@@ -281,7 +288,7 @@ private function keysTreeView(array $keys): array {
                         'key'  => $key_data['key'],
                         'info' => [
                             'bytes_size'           => $key_data['size'],
-                            'timediff_last_access' => $key_data['la'],
+                            'timediff_last_access' => $key_data['la'] !== 0 ? $key_data['la'] : null,
                             'ttl'                  => $key_data['ttl'],
                         ],
                     ];

src/Dashboards/Memcached/PHPMem.php

@@ -113,11 +113,40 @@ public function isConnected(): bool {
      * @throws MemcachedException
      */
     public function getKeys(): array {
-        $raw = $this->runCommand('lru_crawler metadump all');
-        $lines = explode("\n", $raw);
-        array_pop($lines);
+        if (version_compare($this->version(), '1.5.19', '>=')) {
+            $raw = $this->runCommand('lru_crawler metadump all');
+            $lines = explode("\n", $raw);
+            array_pop($lines);
 
-        return $lines;
+            return $lines;
+        }
+
+        $slabs = $this->runCommand('stats items');
+        $lines = explode("\n", $slabs);
+        $slab_ids = [];
+
+        foreach ($lines as $line) {
+            if (preg_match('/STAT items:(\d+):/', $line, $matches)) {
+                $slab_ids[] = $matches[1];
+            }
+        }
+
+        $keys = [];
+
+        foreach (array_unique($slab_ids) as $slab_id) {
+            $dump = $this->runCommand('stats cachedump '.$slab_id.' 0');
+            $dump_lines = explode("\n", $dump);
+
+            foreach ($dump_lines as $line) {
+                if (preg_match('/ITEM (\S+) \[(\d+) b; (\d+) s\]/', $line, $matches)) {
+                    $exp = (int) $matches[3] === 0 ? -1 : (int) $matches[3];
+                    // Intentionally formatted as lru_crawler output
+                    $keys[] = 'key='.$matches[1].' exp='.$exp.' la=0 cas=0 fetch=no cls=1 size='.$matches[2];
+                }
+            }
+        }
+
+        return $keys;
     }
 
     /**
@@ -166,15 +195,27 @@ public function getKey(string $key): string|false {
      * @throws MemcachedException
      */
     public function getKeyMeta(string $key): array {
-        $raw = $this->runCommand('me '.$key);
+        if (version_compare($this->version(), '1.5.19', '>=')) {
+            $raw = $this->runCommand('me '.$key);
 
-        if ($raw === 'ERROR') {
-            return [];
+            if ($raw === 'ERROR') {
+                return [];
+            }
+
+            $raw = preg_replace('/^ME\s+\S+\s+/', '', $raw); // Remove `ME keyname`
+
+            return $this->parseLine($raw);
         }
 
-        $raw = preg_replace('/^ME\s+\S+\s+/', '', $raw); // Remove `ME keyname`
+        foreach ($this->getKeys() as $line) {
+            $data = $this->parseLine($line);
+
+            if ($data['key'] === $key) {
+                return $data;
+            }
+        }
 
-        return $this->parseLine($raw);
+        return [];
     }
 
     /**
@@ -186,6 +227,13 @@ public function exists(string $key): bool {
         return $this->getKey($key) !== false;
     }
 
+    /**
+     * @throws MemcachedException
+     */
+    public function version(): string {
+        return str_replace('VERSION ', '', $this->runCommand('version'));
+    }
+
     /**
      * Run command.
      *

templates/partials/table_view.twig

@@ -44,7 +44,7 @@
                             {{- item|number -}}
                         {% elseif item_key starts with 'time_' %}
                             {{- item|time -}}
-                        {% elseif item_key starts with 'timediff_' %}
+                        {% elseif item_key starts with 'timediff_' and item is not empty %}
                             <span title="{{ item|time }}">{{- item|timediff -}}</span>
                         {% elseif item_key starts with 'bytes_' %}
                             {{- item|bytes -}}

templates/partials/tree_view.twig

@@ -39,7 +39,7 @@
                                 {{- kitem|number -}}
                             {% elseif item_key starts with 'time_' %}
                                 {{- kitem|time -}}
-                            {% elseif item_key starts with 'timediff_' %}
+                            {% elseif item_key starts with 'timediff_' and kitem is not empty %}
                                 <span title="{{ kitem|time }}">{{- kitem|timediff -}}</span>
                             {% elseif item_key starts with 'bytes_' %}
                                 {{- kitem|bytes -}}