Message Routing Design

[misterfish]

Not necessary before Friday – An overview like this would be very helpful for us in understanding the message router.

Given two services L1 and L2 and message router ML on the same node, and service R and message router MR on a remote node.

• Case: L1 wants to talk to L2
  How: L1 sends a unicast message M to ML with dst=L2, body=CBOR(... application payload ... ). ML sees that src and dst are local and passes it on.
  Example: …

• Case: L1 wants to talk to ML.
  How: L1 sends a unicast message M to ML with dst=ML. Finished.
  Example: tell ML to join a particular group. Then M will have body=CBOR([1, CBOR({addr: pubkey, local: bool})])

• Case: L1 wants to talk to R. (Current spec.)
  How: L1 looks up the message router MR for R. L1 wraps unicast message M with dst=R in unicast message N with dst=MR, body=CBOR([0, CBOR(M)]) and sends it to ML. ML unwraps it, sees that src of M is local and dst is remote and sends M to MR. MR sees that src of M is remote and dst is local and passes it to R. Finished.
  Example: …

• Case: L1 wants to talk to R. (Proposed.)
  How: L1 sends a unicast message M to ML with dst=R. ML sees that src is local and dst is remote, looks up the message router MR for R, and sends M to MR. MR sees that src is remote and dst is local and passes it to R.
  Example: …

(Please check )

• More cases, also multicast …