目前，如果我们要使用的设备添加到SNS应用：

Currently, If we want to add a device to an SNS application using:

ep = SNSConnection.create_platform_endpoint(app_arn,device_token,user_data)

有该设备已在过去已添加的选项。 要验证设备是否已添加，我们使用的是：

There is an option that the device was already added in the past. To verify if the device is already added, we're using:

def is_device_registered(device_token):
        list_of_endpoints = SNSConnection.list_endpoints_by_platform_application(AC.INPLAY_CHAT_APPLICATION_SNS_ARN)
        all_app_endpoints = list_of_endpoints['ListEndpointsByPlatformApplicationResponse']['ListEndpointsByPlatformApplicationResult']['Endpoints']
        for ep in all_app_endpoints:
            ep_device_token = ep['Attributes']['Token']
            if device_token == ep_device_token:
                endpoint_arn =  ep['EndpointArn']
                print 'Found an endpoint for device_token: %s, entry:%s' % (device_token,endpoint_arn)
                return endpoint_arn
        return None

这是非常低效的，不能进行缩放。

which is very inefficient and can not be scaled.

是那里得到一个博托SNS功能的device_token并返回，如果存在endpoint_arn？ （无如果没有）。

is there a boto sns function that get the device_token and returns the endpoint_arn if exists? (None if not).

推荐答案

亚马逊为您提供了错误信息阿尔恩。你可以从那里解析它。不是最优的，但可以节省一些分贝查找。

Amazon gives you the arn on the Error Message. You can parse it from there. Not optimal, but saves some db lookup.

错误：SNS错误 - 无法subcribe用户SNSInvalidParameter：无效的参数：令牌原因：端点ARN：AWS：SNS：美国朝东[的ARN关键休息]与同样已经存在，但不同的属性。下面是正则表达式准备好了一些咖啡

error: SNS ERROR - Could not subcribe user to SNSInvalidParameter: Invalid parameter: Token Reason: Endpoint arn:aws:sns:us-east-[rest of the ARN Key] already exists with the same Token, but different attributes. Here is some coffe with regex ready to go

if err?
  log.error "SNS ERROR - Could not subcribe user to SNS" + err
  #Try to get arn from error

  result = err.message.match(/Endpoint(.*)already/)
  if result?.length
    #Assign and remove leading and trailing white spaces.
    result = result[1].replace /^\s+|\s+$/g, ""
    log.debug "found existing arn-> #{result} "