如何为asp.net core添加protobuf支持详解

前言

在一些性能要求很高的应用中，使用protocol buffer序列化，优于Json。而且protocol buffer向后兼容的能力比较好。

由于Asp.net core 采用了全新的MiddleWare方式，因此使用protobuf序列化，只需要使用Protobuf-net修饰需要序列化的对象，并在MVC初始化的时候增加相应的Formatter就可以了。

没时间解释了，快上车。

通过NuGet获取Zaabee.AspNetCoreProtobuf

Install-Package Zaabee.AspNetCoreProtobuf

在Startup.cs文件中修改ConfigureServices方法

public void ConfigureServices(IServiceCollection services)
{
  services.AddMvc(options => { options.AddProtobufSupport(); });
}

搞掂……这时候你就可以通过application/x-protobuf的content-type来让asp.net core使用protobuf来进行序列化/反序列化。

测试代码

在asp.net core项目中添加以下DTO

[ProtoContract]
public class TestDto
{
  [ProtoMember(1)] public Guid Id { get; set; }
  [ProtoMember(2)] public string Name { get; set; }
  [ProtoMember(3)] public DateTime CreateTime { get; set; }
  [ProtoMember(4)] public List<TestDto> Kids { get; set; }
  [ProtoMember(5)] public long Tag { get; set; }
  [ProtoMember(6)] public TestEnum Enum { get; set; }
}

public enum TestEnum
{
  Apple,
  Banana,
  Pear
}

新建一个XUnit项目，通过Nuget引用Microsoft.AspNetCore.TestHost，建立一个测试类

public class AspNetCoreProtobufTest
{
  private readonly TestServer _server;
  private readonly HttpClient _client;

  public AspNetCoreProtobufTest()
  {
    _server = new TestServer(
      new WebHostBuilder()
        .UseKestrel()
        .UseStartup<Startup>());
    _client = _server.CreateClient();
  }

  [Fact]
  public void Test()
  {
    // HTTP Post with Protobuf Response Body
    _client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-protobuf"));

    var dtos = GetDtos();
    var stream = new MemoryStream();
    ProtoBuf.Serializer.Serialize(stream, dtos);

    HttpContent httpContent = new StreamContent(stream);

    // HTTP POST with Protobuf Request Body
    var responseForPost = _client.PostAsync("api/Values", httpContent);

    var result = ProtoBuf.Serializer.Deserialize<List<TestDto>>(
      responseForPost.Result.Content.ReadAsStreamAsync().Result);

    Assert.True(CompareDtos(dtos,result));
  }

  private static bool CompareDtos(List<TestDto> lstOne, List<TestDto> lstTwo)
  {
    lstOne = lstOne ?? new List<TestDto>();
    lstTwo = lstTwo ?? new List<TestDto>();

    if (lstOne.Count != lstTwo.Count) return false;

    for (var i = 0; i < lstOne.Count; i++)
    {
      var dtoOne = lstOne[i];
      var dtoTwo = lstTwo[i];
      if (dtoOne.Id != dtoTwo.Id || dtoOne.CreateTime != dtoTwo.CreateTime || dtoOne.Enum != dtoTwo.Enum ||
        dtoOne.Name != dtoTwo.Name || dtoOne.Tag != dtoTwo.Tag || !CompareDtos(dtoOne.Kids, dtoTwo.Kids))
        return false;
    }

    return true;
  }

  private static List<TestDto> GetDtos()
  {
    return new List<TestDto>
    {
      new TestDto
      {
        Id = Guid.NewGuid(),
        Tag = long.MaxValue,
        CreateTime = DateTime.Now,
        Name = "0",
        Enum = TestEnum.Apple,
        Kids = new List<TestDto>
        {
          new TestDto
          {
            Id = Guid.NewGuid(),
            Tag = long.MaxValue - 1,
            CreateTime = DateTime.Now,
            Name = "00",
            Enum = TestEnum.Banana
          },
          new TestDto
          {
            Id = Guid.NewGuid(),
            Tag = long.MaxValue - 2,
            CreateTime = DateTime.Now,
            Name = "01",
            Enum = TestEnum.Pear
          }
        }
      },
      new TestDto
      {
        Id = Guid.NewGuid(),
        Tag = long.MaxValue - 3,
        CreateTime = DateTime.Now,
        Name = "1",
        Enum = TestEnum.Apple,
        Kids = new List<TestDto>
        {
          new TestDto
          {
            Id = Guid.NewGuid(),
            Tag = long.MaxValue - 4,
            CreateTime = DateTime.Now,
            Name = "10",
            Enum = TestEnum.Banana
          },
          new TestDto
          {
            Id = Guid.NewGuid(),
            Tag = long.MaxValue - 5,
            CreateTime = DateTime.Now,
            Name = "11",
            Enum = TestEnum.Pear
          }
        }
      }
    };
  }
}								 
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