gRPC in Java - How to recieve file content as response - grpc

Question

I'm new to gRPC programming. I need to write a gRPC client which receives file content sent from the gRPC server and send this content to web-page. As the file content is huge, I've set it as a stream.
Below is my .proto file
service LogService {
rpc fetchLogContent(LogRequest) returns (stream LogResponse);
}
message LogRequest {
string ip = 1;
string fileName = 2;
}
message LogResponse {
string ip = 1;
string logContent = 2;
}
Now, in the client, when I use the blockingStub to access fetchLogContent, it returns an Iterator . I understand from the examples provided grpc.io - java, if there are list of response objects, (list of Feature objects in the example provided in link), an Iterator will be valid. But in my case, I need a single LogResponse which was sent as a stream. Please provide any suggestions/alternatives for this. Thanks in advance. :)

Answer 1

In your Method definition:
rpc fetchLogContent(LogRequest) returns (stream LogResponse);
The stream keyword means that you will get 0 or more LogResponse messages. If the content is very large, what you can do is read chunks of the file (like 4kb) and send multiple LogResponse messages each with a part of the file. The client side can read the chunks repeatedly, and piece it back together.
Since the ip field will likely not be changing each time, you can make you server only set ip on the first message. On the client, just use the very first ip received.