NoSuchMethodError: The method '&' was called on null. about grpc-dart HOT 5 CLOSED

cc @sigurdm, any idea what's going on here?

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I think I need to know more about the type of stub and the implementation of postImage to really help here. You are right that it looks like you are using the first byte as a method name. You should be calling a named remote method with the content as a parameter.

As a side-comment, I think your chunkFileBytes has a mistake in the second if-statement. It should be outside the for-loop I think. Otherwise it will send chunks of length '1, 2, 3, 4...'.

from grpc-dart.

Nice catch on the chunkFileBytes function @sigurdm

Some extra details on the stub, I have a service declared as

service PostService {
    rpc PostImage (stream ImageRequest) returns (PostResponse) {
    }
}

And the respective messages

message ImageRequest {
    bytes content = 1;
}

message PostResponse {
    string id = 1;
    string url = 2;
}

from grpc-dart.

An update, seems like that last block I have over here, that @sigurdm pointed out

if (counter > 0) {
      var req = new ImageRequest();
      req.content = buffer;
      yield req;
    }

which probably has a different size is the problem, in the main loop I can actually stream and send full 1024 chunks, but the very last chunk throws the error, I'm assuming there's a termination character that I'm getting from dart that I'm trying to pass to grpc which should probably be handled differently?

Strangely the last byte of that stream si 217 so I don't think that is the problem, the complaint from grpc is that a byte 255 was passed

last two bytes of the chunk in case it's relevant and mean something I'm missing

flutter: LAST BYTE 255
flutter: LAST BYTE 217

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The problem was I was trying to send a buffer of size 1024 with only 462 bytes populated, I just had to build a buffer of the right size, before passing it to grpc

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