使用servicestack捕获异常

Question

我们已经使用ServiceStack基于REST的服务已经有一段时间了,到目前为止它一直很棒.

我们所有的服务都写成:

public class MyRestService : RestService<RestServiceDto>
{
   public override object OnGet(RestServiceDto request)
   {
   }
}

对于每个DTO,我们都有Response等效对象:

public class RestServiceDto 
{
    public ResponseStatus ResponseStatus {get;set;}
}

如果它们被抛出,它会处理所有异常.

我注意到的是,如果在OnGet()或OnPost()方法中抛出异常,则http状态描述包含异常类的名称,就好像我扔了一样:

new HttpError(HttpStatus.NotFound, "Some Message");

那么http状态描述包含文本"Some Message".

Since some of the rest services are throwing exceptions and others are throwing new HttpError(), I was wondering if there was a way without changing all my REST services to catch any exceptions and throw a new HttpError()?

So for example, if the OnGet() method throws an exception, then catch it and throw a new HttpError()?

Answer 1

使用旧API - 继承自定义基类

当您使用旧API来处理异常时,您应该提供Custom Base类并覆盖HandleException方法,例如:

public class MyRestServiceBase<TRequest> : RestService<TRequest>
{
   public override object HandleException(TRequest request, Exception ex)
   {
       ...
       return new HttpError(..);
   }
}

然后,为了利用自定义错误处理,您的所有服务都会继承您的类,例如:

public class MyRestService : MyRestServiceBase<RestServiceDto>
{
   public override object OnGet(RestServiceDto request)
   {    
   }
}

使用新API - 使用ServiceRunner

否则,如果您正在使用ServiceStack改进的New API,那么您不需要让所有服务都继承基类,而是可以通过覆盖CreateServiceRunner告诉ServiceStack在AppHost中使用自定义运行器:

public override IServiceRunner<TRequest> CreateServiceRunner<TRequest>(
    ActionContext actionContext)
{           
    return new MyServiceRunner<TRequest>(this, actionContext); 
}

MyServiceRunner只是一个实现您感兴趣的自定义钩子的自定义类,例如:

public class MyServiceRunner<T> : ServiceRunner<T> {
    public override object HandleException(IRequestContext requestContext, 
        TRequest request, Exception ex) {
      // Called whenever an exception is thrown in your Services Action
    }
}