RPC protocol framing details?
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Jens Alfke
Dec 16, 2022, 1:07:26 PM12/16/22
to Cap'n Proto
The RPC docs say:
> The Cap'n Proto RPC protocol is defined in terms of Cap'n Proto serialization schemas. The documentation is inline. See rpc.capnp.
That interface definition is beautifully commented, it’s practically Literate Programming, but it’s not the whole story. How are the messages (serialized structs) sent over the wire? Is it as simple as just writing one serialized buffer after another to a byte-stream, or is there an underlying framing protocol?
—Jens
> The Cap'n Proto RPC protocol is defined in terms of Cap'n Proto serialization schemas. The documentation is inline. See rpc.capnp.
That interface definition is beautifully commented, it’s practically Literate Programming, but it’s not the whole story. How are the messages (serialized structs) sent over the wire? Is it as simple as just writing one serialized buffer after another to a byte-stream, or is there an underlying framing protocol?
—Jens
Kenton Varda
Dec 16, 2022, 1:22:49 PM12/16/22
to Jens Alfke, Cap'n Proto
Yes, the messages are simply written to the wire one after another. Cap'n Proto messages in the standard serialization are self-delimiting, so there's no need for a framing protocol.
-Kenton
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