资源编排：SDK常见问题

使用SDK时遇到报错ErrCode:SDK.ServerUnreachable怎么办？

问题现象

当您使用SDK时，遇到以下报错信息（请求超时或服务器不可达）：

ErrCode:ServerUnreachable
ErrMsg:SocketTimeoutException has occurred on a socket read or accept.

解决方案

1. 在请求中设置ClientToken参数避免多次重试带来重复操作的问题。

   说明

   调用接口前，需配置环境变量，通过环境变量读取访问凭证。更多信息，请参见配置访问凭证。

   AccessKey ID和AccessKey Secret的环境变量名：ALIBABA_CLOUD_ACCESS_KEY_ID、ALIBABA_CLOUD_ACCESS_KEY_SECRET。

   Python示例代码如下：

   # coding=utf-8
   import time
   import uuid
   
   from alibabacloud_ros20190910 import models as ros20190910_models
   from aliyunsdkcore.acs_exception.exceptions import ClientException, ServerException
   from alibabacloud_tea_openapi import models as open_api_models
   from alibabacloud_credentials.client import Client as CredClient
   from alibabacloud_ros20190910.client import Client as ROS20190910Client
   
   
   def generate_client_token(prefix, add_uuid, *suffix_list):
       if prefix:
           t = [prefix]
       else:
           t = []
       if add_uuid:
           t.append(str(uuid.uuid1())[:-13])
       t.extend(suffix_list)
       r = '_'.join(t)
       if len(r) > 64:
           r = r[:64]
       return r
   
   
   def retry_with_client_token(retry_interval=10, retry_time_out=300):
       def wrapper(fun):
           def retry_func(*args, **kwargs):
               retry_timeout = retry_time_out
               elapsed_time = 0
               # 保证请求的幂等性。该值由客户端生成，并且必须是全局唯一的。
               kwargs['client_token'] = generate_client_token(None, True)
               while True:
                   try:
                       retry_timeout -= elapsed_time
                       return fun(*args, **kwargs)
                   except Exception as e:
                       if isinstance(e, ClientException):
                           if e.error_code != 'SDK.HttpError':
                               raise
                       elif isinstance(e, ServerException):
                           if e.error_code not in ('LastTokenProcessing', 'ServiceUnavailable'):
                               raise
                       else:
                           raise
   
                       time.sleep(retry_interval)
                       elapsed_time += retry_interval
                       if elapsed_time >= retry_timeout:
                           raise
   
           return retry_func
   
       return wrapper
   
   
   class RosClient(object):
   
       @staticmethod
       def create_client():
           """
           初始化账号Client
           @return: Client
           @throws Exception
           """
           cred = CredClient()
           config = open_api_models.Config(
               credential=cred
           )
           # 访问的域名
           config.endpoint = 'ros.aliyuncs.com'
   
           return ROS20190910Client(config)
   
       @retry_with_client_token(retry_interval=10, retry_time_out=300)
       def create_stack(self, region_id, stack_name, template_body, **kwargs):
           client = self.create_client()
           create_stack_request = ros20190910_models.CreateStackRequest(
               region_id=region_id,
               stack_name=stack_name,
               # 若模板较大，建议使用TemplateURL参数，避免URL过长，调用失败。
               # 您也可以使用Body Param + HTTP POST的方式传递模板内容。
               template_body=template_body,
               disable_rollback=True,
               **kwargs
           )
           response = client.create_stack(create_stack_request)
   
           return response.body
   
   
   if __name__ == '__main__':
       regin_id = 'cn-beijing'
       ros_client = RosClient()
       stack_name = 'test'
       template_body = "{\"ROSTemplateFormatVersion\": \"2015-09-01\"}"
       result = ros_client.create_stack(region_id=regin_id, stack_name=stack_name, template_body=template_body)
       print('stack_id:', result)

2. 如果问题依然存在，请提交工单获取支持。