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)。
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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 $this->response;
}
5.最终可以推导出问题出在RequestCore中的CURL。
解决方案：
curl有一个CURLOPT_IPRESOLVE选项，作用是指定使用那种IP协议(IPV4/IPV6)。
CURLOPT_IPRESOLVE - specify which IP protocol version to use
选项：
CURL_IPRESOLVE_WHATEVER
Default, resolves addresses to all IP versions that your system allows.
CURL_IPRESOLVE_V4
Resolve to IPv4 addresses.
CURL_IPRESOLVE_V6
Resolve to IPv6 addresses.
这里要注意：默认值（curl没有主动设置CURLOPT_IPRESOLVE选项时，则系统会使用默认值）。
Default, resolves addresses to all IP versions that your system allows.
含义为：默认使用服务器系统允许的所有IP版本来解析地址。
而服务器系统可能存在同时支持IPV4/IPV6,CURL会挨个去试。当本地网络不支持其中任何一种IP版本协议时，会出现超时。
所以，最终的解决方案为显式指定CURL的CURLOPT_IPRESOLVE选项。
curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);参考官方CURLOPT_IPRESOLVE
