Hashrpc is a very simple stream protocol for hash based messages.
There are only three message types.
- get block
- send block
- control
All messages, including control messages, are hash addressed.
All hash addresses are CIDs.
Single byte Uint8 for each message type:
- get block
1 - send block
2 - control
3
This specification does not define what a control message is or how it is used, that's up to the application. Nor does this specification define any size limitation on blocks, a "block" could be an entire CAR file reqested by its CID (once we have a spec for CAR CIDs).
All message types are bi-directional, any node can send any message type at any time.
[ 1, length, CID ]
[ 2, CIDLength, blockLength, CID, block ]
[ 3, CIDLength, blockLength, CID, block ]