If you're trying to close the stream from the receiver then you can cancel the context passed to the stream.

ctx, cancel := context.WithCancel(ctx)
stream, err := client.StreamingRPC(ctx)
// do something on stream
cancel()

Sources:

• https://github.com/grpc/grpc-go/issues/990#issuecomment-261131233
• https://pkg.go.dev/google.golang.org/grpc#ClientConn.NewStream