我想知道是否可以在不反序列化有效负载的情况下,将自定义消息头注入传出请求以携带额外信息,以完全填充通过messagesinspector提供的wcf等请求的身份验证、验证或关联功能?
更新
使用SDK v2,您现在可以(相对)轻松地修改Reliable Services和Actors的头。请注意,在下面的示例中,为了简洁起见,省略了一些包装器成员。
客户端
我们使用ServiceProxyFactory
来创建代理,而不是静态的ServiceProxy
。然后我们可以封装IServiceRemotingClientFactory
和IServiceRemotingClient
并拦截服务调用。ActorProxyFactory
也可以这样做。注意,这会覆盖属性(如WcfServiceRemotingProviderAttribute
)的行为,因为我们自己明确指定了客户端工厂。
_proxyFactory = new ServiceProxyFactory(c => new ServiceRemotingClientFactoryWrapper(
// we can use any factory here
new WcfServiceRemotingClientFactory(callbackClient: c)));
private class ServiceRemotingClientFactoryWrapper : IServiceRemotingClientFactory
{
private readonly IServiceRemotingClientFactory _inner;
public ServiceRemotingClientFactoryWrapper(IServiceRemotingClientFactory inner)
{
_inner = inner;
}
public async Task<IServiceRemotingClient> GetClientAsync(Uri serviceUri, ServicePartitionKey partitionKey, TargetReplicaSelector targetReplicaSelector,
string listenerName, OperationRetrySettings retrySettings, CancellationToken cancellationToken)
{
var client = await _inner.GetClientAsync(serviceUri, partitionKey, targetReplicaSelector, listenerName, retrySettings, cancellationToken).ConfigureAwait(false);
return new ServiceRemotingClientWrapper(client);
}
}
private class ServiceRemotingClientWrapper : IServiceRemotingClient
{
private readonly IServiceRemotingClient _inner;
public ServiceRemotingClientWrapper(IServiceRemotingClient inner)
{
_inner = inner;
}
public Task<byte[]> RequestResponseAsync(ServiceRemotingMessageHeaders messageHeaders, byte[] requestBody)
{
// use messageHeaders.AddHeader() here
return _inner.RequestResponseAsync(messageHeaders, requestBody);
}
public void SendOneWay(ServiceRemotingMessageHeaders messageHeaders, byte[] requestBody)
{
// use messageHeaders.AddHeader() here
_inner.SendOneWay(messageHeaders, requestBody);
}
}
服务器
从ServiceRemotingDispatcher
和ActorServiceRemotingDispatcher
继承以检查标头。
class CustomServiceRemotingDispatcher : ServiceRemotingDispatcher
{
public override async Task<byte[]> RequestResponseAsync(IServiceRemotingRequestContext requestContext, ServiceRemotingMessageHeaders messageHeaders, byte[] requestBody)
{
// read messageHeaders here
// or alternatively put them in an AsyncLocal<T> scope
// so they can be accessed down the call chain
return base.RequestResponseAsync(requestContext, messageHeaders, requestBody);
}
}
要使用这个类,我们再次需要通过直接创建通信侦听器来覆盖ServiceRemotingProviderAttribute
:
class MyService : StatelessService
{
protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners()
{
yield return new ServiceInstanceListener(context => new WcfServiceRemotingListener(context, new CustomServiceRemotingDispatcher());
}
}
几周前,我在MSDN论坛上问了同样的问题,但没有得到回复。
我查看了客户端库的源代码,但没有找到添加头的方法。恐怕唯一的方法是将它们作为方法调用的一部分添加。这可以通过使用请求类作为方法参数并使用它们的继承来实现。(例如,RequestBase类的头为[Authorization,ClientInfo,…])。然后,您必须通过包装所有调用或手动设置来确保为每个请求设置这些头。
如能得到Service Fabric团队的进一步澄清,我们将不胜感激。