使用Azure Service Fabric的默认客户端时如何向请求添加消息头？

我想知道是否可以将自定义消息头注入到传出请求中以携带附加信息，而无需反序列化有效负载来完成身份验证、验证或请求关联等功能，例如通过消息检查器提供的 wcf ？

Update

使用 SDK v2，您现在可以（相对）轻松地修改 Reliable Services 和 Actors 的标头。请注意，为了简洁起见，在下面的示例中省略了一些包装器成员。

Client

We use ServiceProxyFactory创建代理而不是静态ServiceProxy。然后我们就可以包起来IServiceRemotingClientFactory and IServiceRemotingClient并拦截服务调用。同样可以用ActorProxyFactory。请注意，这会覆盖属性的行为，例如WcfServiceRemotingProviderAttribute，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);
        }
    }

Server

继承自ServiceRemotingDispatcher and ActorServiceRemotingDispatcher检查标题。

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，我们再次需要重写ServiceRemotingProviderAttribute通过直接创建通信监听器：

class MyService : StatelessService
{
     protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners()
     {
          yield return new ServiceInstanceListener(context => new WcfServiceRemotingListener(context, new CustomServiceRemotingDispatcher());
     }
}