incremental expire for negative responses

to avoid false negative, expire time start little and double each time it fail since last try.
URL cache now store timestamp and expire time. (need to flush cache if update from previous commit)
+ fixed : multi-render do not check urls anymore

app/class/Serviceurlchecker.php

@@ -26,12 +26,6 @@ class Serviceurlchecker
     /** @var int MAX_BOUNCE limit of redirections to follow */
     public const MAX_BOUNCE = 8;
 
-    /** @var int OK_CACHE_EXPIRE_TIME in days */
-    public const OK_CACHE_EXPIRE_TIME = 90;
-
-    /** @var int DEAD_CACHE_EXPIRE_TIME in minutes */
-    public const DEAD_CACHE_EXPIRE_TIME = 1;
-
     /** @var null[] URL response code considered as not dead */
     public const ACCEPTED_RESPONSE_CODES = [
         200 => null,
@@ -73,11 +67,11 @@ public function __construct(int $timeout = 0)
     public function check(string $url): bool
     {
         if ($this->iscachedandvalid($url)) {
-            return $this->isalive($this->urls[$url]['response']);
-        } else {
+            return $this->responseisaccepted($this->urls[$url]['response']);
+        } elseif (!$this->cacheonly) {
             $this->queue[] = $url;
-            throw new RuntimeException('no status about this URL');
         }
+        throw new RuntimeException('no status about this URL');
     }
 
     /**
@@ -163,27 +157,36 @@ public function processqueue(): int
         foreach ($curlhandles as $url => $curlhandle) {
             $curlerror = curl_errno($curlhandle);
 
-            if ($curlerror === CURLE_OK) {
-                $newurls[$url] = [
-                    'response' => curl_getinfo($curlhandle, CURLINFO_HTTP_CODE),
-                    'timestamp' => time(),
-                    'expire' => time() + self::OK_CACHE_EXPIRE_TIME * 24 * 3600,
-                ];
-            } elseif ($curlerror === CURLE_OPERATION_TIMEDOUT && count($this->queue) > 10) {
+            if ($curlerror === CURLE_OPERATION_TIMEDOUT && count($this->queue) > 10) {
                 // if queue was big, there is chances that timeout is due to curl saturation
                 // consider the link as unchecked
+                continue;
+            }
+
+            if ($curlerror !== CURLE_OK) {
+                $response = $curlerror;
             } else {
-                if (key_exists($url, $this->urls) && $this->isalive($this->urls[$url]['response'])) {
-                    $expire = time() + (time() - $this->urls[$url]['timestamp']) * 2;
-                } else {
-                    $expire = time() + self::DEAD_CACHE_EXPIRE_TIME * 60;
-                }
-                $newurls[$url] = [
-                    'response' => $curlerror,
-                    'timestamp' => time(),
-                    'expire' => $expire,
-                ];
+                $response = curl_getinfo($curlhandle, CURLINFO_HTTP_CODE);
+            }
+
+            if ($this->responseisaccepted($response) || $response === 404) {
+                $expire = time() + 80 * 24 * 3600 + rand(0, 40 * 24 * 3600); // 100 +-20 days
+            } elseif (key_exists($url, $this->urls) && !$this->responseisaccepted($this->urls[$url]['response'])) {
+                // If it was already an error before: expire in twice the time since previous timestamp
+                $expire = time() + (time() - $this->urls[$url]['timestamp']) * 2;
+            } elseif ($response === 429) { // Too many request: let's expire in one hour to avoid another one
+                $expire = time() + 3600;
+            } elseif ($response > 200) { // default to ten minutes for other error codes
+                $expire = time() + 600;
+            } else { // for curl error : expire in one minute
+                $expire = time() + 60;
             }
+
+            $newurls[$url] = [
+                'response' => $response,
+                'timestamp' => time(),
+                'expire' => $expire,
+            ];
         }
 
         curl_multi_close($multihandle);
@@ -198,7 +201,7 @@ public function processqueue(): int
      *
      * @return bool                         Indicate if code mean alive or not.
      */
-    public static function isalive(int $response): bool
+    public static function responseisaccepted(int $response): bool
     {
         return key_exists($response, self::ACCEPTED_RESPONSE_CODES);
     }