问题
I had wrote a node/ssjs program that makes:
- Tcp connection to data server(Apache MIMA), using TLS module. (OK)
- Encode/decode(serialize/deserialize) messages through protobuffer module.. (OK)
- Send serialized message to server and get response. (Not OK).
The server´s manual types:
Structure of message:
[ Length | Header length | Header (| Body length |Body) ]
Length – message length = fixed size (4 bytes). Note that this is only the size of
following message (not the prefix itself);
Header length – fixed size (4 bytes);
Header – contains message metadata (e.g. messageId);
Body length – fixed size (4 bytes, optional). If body is not required, body size is
not serialized. In such case, message is 4 (message length) + 4
(header length) + length(header) bytes long.
Body – the message payload (optional). If body is not present (e.g. response
notification without data) it is not serialized.
Length [bytes] Content
4 Whole message length
4 Header message length (H_LEN)
H_LEN Protocol Buffers encoded MessageHeaderProto
4 Body message length (B_LEN), optional
B_LEN Protocol Buffers encoded Message
My questions are:
- How to get the 4-bytes-length of a protobuffer?
- How to concatenate those buffers before send?
- How to send?
- Is it possible to do with JavaScript? Observation: The server uses Little Endian byte order, client side too.
Thank you all...
来源：https://stackoverflow.com/questions/17973201/node-js-protobuffer-buffer-lentgh-how-to-send-structured-buffer-message-trou