I am posting protobuf messages to a message broker, and in order to
identify them, I prefix the message bytes with the serialized result of a
"header" message:
message Header {
int version = 1;
string message_type = 2;
}
It is easy, to concatenate the header+actual message bytes and post the
resulting block to a queue. But how do I take these apart on the receiving
end? Suppose I get a byte-buffer consisting of:
---------------
| header |
---------------
| body |
---------------
Is it OK to throw this oversized buffer at the Header deserialization?
Will the extra bytes hurt anything?
Then, once I extract the Header message, how do I know where the body
begins? I could turn around and ask the Header object "how big would you be
if serialized?". Is that reliable? Is there a better way?
Thanks
john
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