CURL解析超时的解决方案

迷南。 2022-01-16 08:11 667阅读 0赞

> 背景：项目中需要在抓取纷享销客CRM图片上传到OSS,调用OssClient.php时，容易发生解析超时(多重试几次就ok)。

**错误提示：**

[2019-04-08 19:41:01] lumen.DEBUG: 出错文件：/home/zrj/www/admin/yundou-admin/vendor/aliyuncs/oss-sdk-php/src/OSS/OssClient.php  
    [2019-04-08 19:41:01] lumen.DEBUG: 出错编码：0  
    [2019-04-08 19:41:01] lumen.DEBUG: 出错行号：2187  
    [2019-04-08 19:41:01] lumen.DEBUG: 出错信息：RequestCoreException: cURL resource: Resource id #371; cURL error: Resolving timed out after 10521 milliseconds (28)

> Resolving timed out after 10521 milliseconds (28)  
> 解析超时

**源码分析:**

try {
                $ossClient = new OssClient(self::$accessKeyId, self::$accessKeySecret, self::$endpoint);
                $ossClient->uploadFile(self::$bucket, $ossFileName, $localhostFileName);//上传文件
                $ossClient->putBucketAcl(self::$bucket, OssClient::OSS_ACL_TYPE_PUBLIC_READ);
            } catch (OssException $e) {
                self::debugException($e);
                throw new \Exception("上传oss失败:" . $e->getMessage(), $e->getCode());
            }

1.实例化OssClient客户端后，调用uploadFile方法。  
2.uploadFile调用了auth,验证并且执行请求，按照OSS Api协议，执行操作。

/**
         * 上传本地文件
         *
         * @param string $bucket bucket名称
         * @param string $object object名称
         * @param string $file 本地文件路径
         * @param array $options
         * @return null
         * @throws OssException
         */
        public function uploadFile($bucket, $object, $file, $options = NULL)
        {
            ......
            $response = $this->auth($options);
            $result = new PutSetDeleteResult($response);
            return $result->getData();
        }

3.auth中调用RequestCore类创建请求

/**
         * 验证并且执行请求，按照OSS Api协议，执行操作
         *
         * @param array $options
         * @return ResponseCore
         * @throws OssException
         * @throws RequestCore_Exception
         */
        private function auth($options)
        {
                ......
            //创建请求
            $request = new RequestCore($this->requestUrl, $this->requestProxy);
            $request->set_useragent($this->generateUserAgent());
                    ......
                    try {
                $request->send_request();
            } catch (RequestCore_Exception $e) {
                throw(new OssException('RequestCoreException: ' . $e->getMessage()));
            }
        }

4.OSS\\Http\\RequestCore类中send\_request方法通过CURL发送请求(调用了prep\_request准备请求方法)

/**
         * Sends the request, calling necessary utility functions to update built-in properties.
         *
         * @param boolean $parse (Optional) Whether to parse the response with ResponseCore or not.
         * @return string The resulting unparsed data from the request.
         */
        public function send_request($parse = false)
        {
            set_time_limit(0);
    
            $curl_handle = $this->prep_request();
            $this->response = curl_exec($curl_handle);
    
            if ($this->response === false) {
                throw new RequestCore_Exception('cURL resource: ' . (string)$curl_handle . '; cURL error: ' . curl_error($curl_handle) . ' (' . curl_errno($curl_handle) . ')');
            }
    
            $parsed_response = $this->process_response($curl_handle, $this->response);
    
            curl_close($curl_handle);
    
            if ($parse) {
                return $parsed_response;
            }
    
            return $this->response;
        }

5.最终可以推导出问题出在RequestCore中的CURL。

**解决方案：**  
curl有一个CURLOPT\_IPRESOLVE选项，作用是指定使用那种IP协议(IPV4/IPV6)。

> CURLOPT\_IPRESOLVE - specify which IP protocol version to use

***选项：***  
CURL\_IPRESOLVE\_WHATEVER

> Default, resolves addresses to all IP versions that your system allows.

CURL\_IPRESOLVE\_V4

> Resolve to IPv4 addresses.

CURL\_IPRESOLVE\_V6

> Resolve to IPv6 addresses.

这里要注意：默认值（curl没有主动设置CURLOPT\_IPRESOLVE选项时，则系统会使用默认值）。

> Default, resolves addresses to all IP versions that your system allows.

含义为：默认使用服务器系统允许的所有IP版本来解析地址。  
而服务器系统可能存在同时支持IPV4/IPV6,CURL会挨个去试。当本地网络不支持其中任何一种IP版本协议时，会出现超时。