FAQ about SDKs

What do I do if the ErrCode:SDK.ServerUnreachable error is reported when I use SDKs?

The following error may occur when you use SDKs:

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

1. Configure the ClientToken parameter in the request to prevent repeated request processing.

   The sample Python code:

   #!/usr/bin/env python
   # coding=utf-8
   import time
   import uuid
   
   from aliyunsdkcore.client import AcsClient
   from aliyunsdkcore.acs_exception.exceptions import ClientException, ServerException
   from aliyunsdkros.request.v20190910.CreateStackRequest import CreateStackRequest
   
   ACCESS_KEY_ID = ''
   ACCESS_KEY_SECRET = ''
   REGION_ID = 'cn-beijing'
   
   
   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
               # This parameter is used to ensure the idempotence of the request. You can use the client to generate the value, but you must ensure that it is unique among the different requests. 
               kwargs['ClientToken'] = 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):
       def __init__(self):
           self.client = AcsClient(ACCESS_KEY_ID, ACCESS_KEY_SECRET, REGION_ID)
   
       def _send_request(self, request, params, **kwargs):
           request.set_accept_format('json')
           request.set_connect_timeout(10000)
           request.set_read_timeout(0.01)
           params.update(kwargs)
           for name, value in params.items():
               set_func = getattr(request, 'set_{}'.format(name))
               set_func(value)
           return self.client.do_action_with_exception(request)
   
       @retry_with_client_token(retry_interval=10, retry_time_out=300)
       def create_stack(self, params, **kwargs):
           request = CreateStackRequest()
           return self._send_request(request, params, **kwargs)
   
   
   if __name__ == '__main__':
       ros_client = RosClient()
       result = ros_client.create_stack(dict(
           StackName='test',
           TemplateBody="{\"ROSTemplateFormatVersion\": \"2015-09-01\"}"
       ))
       print('stack_id:', result)                  

2. If the error persists, submit a ticket.