如何检查移动设备是否已经注册 [英] How do I check whether a mobile device has already been registered

问题描述

我正在使用Amazon SNS的Amazon AWS Ruby SDK，但对于已经注册的设备有一些麻烦.有时，当设备再次注册时，会出现类似AWS::SNS::Errors::InvalidParameter Invalid parameter: Token Reason: Endpoint arn:aws:sns:us-east-1:**** already exists with the same Token, but different attributes.的错误.如何检查端点是否已经存在，更重要的是，如何获取给定令牌的端点?

I'm using the Amazon AWS Ruby SDK for Amazon SNS but I'm having some trouble with devices already being registered. Sometimes when a device gets registered again I get an error like AWS::SNS::Errors::InvalidParameter Invalid parameter: Token Reason: Endpoint arn:aws:sns:us-east-1:**** already exists with the same Token, but different attributes.. How do I check whether an endpoint already exists and more importantly, how do I get the endpoint for a given token?

推荐答案

相信BvdBijl的想法，我做了一个扩展方法，以删除现有的(如果存在的话)然后添加它.

Credit to BvdBijl's idea, I made an extension method to delete the existing one if found and then add it.

using System;
using System.Text.RegularExpressions;
using Amazon.SimpleNotificationService;
using Amazon.SimpleNotificationService.Model;

namespace Amazon.SimpleNotificationService
{
    public static class AmazonSimpleNotificationServiceClientExtensions
    {
        private const string existingEndpointRegexString = "Reason: Endpoint (.+) already exists with the same Token";
        private static Regex existingEndpointRegex = new Regex(existingEndpointRegexString);
        public static CreatePlatformEndpointResponse CreatePlatformEndpointIdempotent(
            this AmazonSimpleNotificationServiceClient client,
            CreatePlatformEndpointRequest request)
        {
            try
            {
                var result = client.CreatePlatformEndpoint(request);
                return result;
            }
            catch (AmazonSimpleNotificationServiceException e)
            {
                if (e.ErrorCode == "InvalidParameter")
                {
                    var match = existingEndpointRegex.Match(e.Message);
                    if (match.Success) {
                        string arn = match.Groups[1].Value;
                        client.DeleteEndpoint(new DeleteEndpointRequest
                        {
                             EndpointArn = arn,
                        });
                        return client.CreatePlatformEndpoint(request);
                    }
                }
                throw;
            }
        }
    }
}

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