I'm finally getting back to this after many distractions, and still not
able to get things working unfortunately.
Just to note - I was previously using the AsyncAuthInterceptor for adding a
token to the call headers, but because this is not a true interceptor, it's
not possible to retry if the call fails authentication on the server side.
So, I'm back to trying to figure out how to retry a server streaming call.
My question is, how can I know from the response headers if the call was
unauthenticated?
Here's a snippet of my code so far:
var responseContinuation = continuation(request, context);
try
{
// Any way to raise an exception when call is
StatusCode=Unauthenticated here?
responseContinuation.ResponseHeadersAsync.WaitAndUnwrapException();
return new AsyncServerStreamingCall<TResponse>(
responseContinuation.ResponseStream,
responseContinuation.ResponseHeadersAsync,
responseContinuation.GetStatus,
responseContinuation.GetTrailers,
responseContinuation.Dispose);
}
catch (RpcException e) when (e.StatusCode == StatusCode.Unauthenticated)
{
if (Task.Run(() => RefreshTokensAsync(cancellationToken),
cancellationToken).Result == false)
_logger.Warn("Unable to refresh access token");
AddOrUpdateHeader(context.Options.Headers, CreateBearerTokenHeader(
AccessToken));
return continuation(request, context);
}
Any pointers very gratefully received.
On Friday, 1 March 2019 15:12:36 UTC+1, Benjamin Krämer wrote:
>
> You also might want to have a look at
> https://github.com/grpc/grpc/tree/master/src/csharp/Grpc.Auth since
> that's the cleaner way to achieve what you try. You can implement an `
> <https://github.com/grpc/grpc/blob/master/src/csharp/Grpc.Auth/GoogleAuthInterceptors.cs#L44>
> AsyncAuthInterceptor`
> <https://github.com/grpc/grpc/blob/master/src/csharp/Grpc.Auth/GoogleAuthInterceptors.cs#L44>
>
> that you then can use for `ChannelCredentials`
> <https://github.com/grpc/grpc/blob/master/src/csharp/Grpc.Auth/GoogleGrpcCredentials.cs#L78>
> .
>
> I still have to check on how to implement the server side for
> checking/validating the token and making the result available through the
> call context. But this should at least solve your current problem.
>
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