fix curl error handler

lib/Segment/Consumer/LibCurl.php

@@ -84,38 +84,39 @@ public function flushBatch($messages) {
       curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 
       // retry failed requests just once to diminish impact on performance
-      $httpResponse = $this->executePost($ch);
+      $responseContent = curl_exec($ch);
+
+      $err = curl_error($ch);
+      if ($err) {
+        $this->handleError(curl_errno($ch), $err);
+        return;
+      }
+
+      $responseCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 
       //close connection
       curl_close($ch);
 
       $elapsed_time = microtime(true) - $start_time;
 
-      if (200 != $httpResponse) {
+      if (200 != $responseCode) {
         // log error
-        $this->handleError($ch, $httpResponse);
+        $this->handleError($responseCode, $responseContent);
 
-        if (($httpResponse >= 500 && $httpResponse <= 600) || 429 == $httpResponse) {
+        if (($responseCode >= 500 && $responseCode <= 600) || 429 == $responseCode) {
           // If status code is greater than 500 and less than 600, it indicates server error
           // Error code 429 indicates rate limited.
           // Retry uploading in these cases.
           usleep($backoff * 1000);
           $backoff *= 2;
-        } elseif ($httpResponse >= 400) {
+        } elseif ($responseCode >= 400) {
           break;
         }
       } else {
         break;  // no error
       }
     }
 
-    return $httpResponse;
-  }
-
-  public function executePost($ch) {
-    curl_exec($ch);
-    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
-
-    return $httpCode;
+    return $responseCode;
   }
 }