获取数据时，ServiceStack MsgPackServiceClient失败，但JsonServiceClient

本文关键字：失败 JsonServiceClient MsgPackServiceClient ServiceStack 数据获取 | 更新日期: 2023-09-27 18:10:58

我正在摆弄ServiceStack，并尝试着理解这项技术。

我有一个非常简单的设置(完整的解决方案可下载):

使用ServiceStack(自托管)的独立AppHost
则查询Article数据列表。

我安装了ServiceStack.Pluging.MsgPack的nuget包，添加了参考并正确设置了AppHost插件，如下面的main()代码所示。

DTO和Service类

这些是我使用的数据类，DTO和服务类:

public class Article : IReturn<Article>
{
    public string AR_REF { get; set; }
    public string AR_DESIGN { get; set; }
    public string AR_CODEBARRE { get; set; }
    public string FA_CODEFAMILLE { get; set; }
    public string CT_INTITULE { get; set; }
}
public class Articles : IReturn<List<Article>> { }
public class ArticleService : Service
{
    public List<Article> Get(Articles request) {
        return new List<Article>() { 
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,            
        };
    }
}

所有这些都允许客户端获得16个虚拟Articles的列表。

服务器端和客户端请求

static void Main() {
    var appHost = new AppHost();
    appHost.Plugins.Add(new MsgPackFormat());
    appHost.Init();
    appHost.Start("http://localhost:8883");
    // Fails when calling client.Get()
    var client = new MsgPackServiceClient("http://localhost:8883");
    List<Article> response = client.Get(new Articles());
    appHost.Stop();
}

与AppHost定义为:

public class AppHost : AppHostHttpListenerBase
{
    static readonly ConfigurationResourceManager AppSettings = new ConfigurationResourceManager();
    public AppHost() : base("Test", typeof(Article).Assembly) { }
    public override void Configure(Funq.Container container) {  }
}

会发生什么

调用client.Get(...)失败，SerializationException说:
解包器尚未读取任何数据。解包器可能永远不会读取或底层流为空。

当我使用超过15条记录的MsgPackServiceClient()时，会发生异常。
奇怪的是，如果我返回15个或更少的Articles实例，它可以工作。
如果我使用JsvServiceClient()或JsonServiceClient()代替，我没有问题返回数千条记录。

我真的不知道是我做错了什么，还是有别的什么东西在起作用。

附加信息和下载

我使用VS2012与ServiceStack 3.9.43(包括MsgPack插件)通过nuget安装。
不管编译选项是什么(AnyCPU/x86)，都会出现这个问题。未启用代码优化(每个解决方案/项目选项都是默认选项)。

您可以下载完整的解决方案并亲自尝试。

获取数据时，ServiceStack MsgPackServiceClient失败，但JsonServiceClient

所以，我不太确定问题是什么。它似乎特定于在AppHost的同一应用程序中使用MsgPackServiceClient。如果您从浏览器向http://localhost:8883/Articles?format=x-msgpack之类的东西发出请求，它似乎可以工作。

编写测试(如底部的测试)似乎可以确认MessagePackSerializer是否正常工作。

添加一个写OutputStream的响应过滤器(如下)似乎可以纠正您的问题。我尝试了16和32个记录。

希望对你有帮助。

    appHost.ResponseFilters.Add((httpReq, httpRes, dto) =>
    {
        if (httpReq.ResponseContentType == ContentType.MsgPack)
        {
            using (var ms = new MemoryStream())
            {
                var serializer = MessagePackSerializer.Create(dto.GetType());
                serializer.PackTo(Packer.Create(ms), dto);
                var bytes = ms.ToArray();
                var listenerResponse = (HttpListenerResponse)httpRes.OriginalResponse;
                listenerResponse.OutputStream.Write(bytes, 0, bytes.Length);
                httpRes.EndServiceStackRequest();
            }
        }
    });

MessagePackSerializer测试

    [Test]
    public void test()
    {
        var arts = new List<Article>() { 
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,
            new Article() {AR_CODEBARRE = "987654", AR_REF = "1002.ARRGHHH", AR_DESIGN = "BLAH BLAH TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "50FAM"} ,
            new Article() {AR_CODEBARRE = "123456", AR_REF = "515.VEROTEST", AR_DESIGN = "THIS IS A TEST", CT_INTITULE = "ACME", FA_CODEFAMILLE = "10FAM"} ,            
        };
        var serializer = MessagePackSerializer.Create<List<Article>>();
        var ms = new MemoryStream();
        serializer.PackTo(Packer.Create(ms), arts);
        ms.Position = 0;
        try
        {
            var obj = serializer.Unpack(ms);
            Assert.IsNotNull(obj);
        }
        catch (Exception ex)
        {
            throw ex;
        }
        ms.Close();
    }