Triggering protocol once identify is done

[D4nte]

• Version: 0.30.10
• Platform: Linux 5.10.19-1-MANJARO We are renaming the prefix of our JavaScript modules from 'node-' to 'js-' #1 SMP PREEMPT Fri Feb 26 11:38:34 UTC 2021 x86_64 GNU/Linux
• Subsystem: Identify

Type: Question/Feature

Severity: Medium

Description:

When Alice connects to a peer that support protocol /foo/1.0.0, Alice wants to automatically initiate the message request for said protocol.

Alice dials Bob, once done, Alice triggers the identify protocol with Bob.
Until the identify protocol is done, Alice does not know what protocol Bob implements.
On Alice side, there is no event emitted once the identify protocol is done.
All we can do is check that Alice's peerStore now contains Bob's protocols.

I would like to propose emitting an event peer:identify once the identify protocol is done and the peer's protocols are now.

Please let me know your thought, am I missing a more obvious solution to my issue?

[vasco-santos]

Hello @D4nte
Once your peer establishes a connection with another peer and the identify protocol finishes, the peer protocols are stored in the Protobook. You can listen for these changes:

libp2p.peerStore.on('change:protocols', ({ peerId, protocols}) => {
  if (protocols.includes('/foo/1.0.0') { }
})

I believe this solves your solution. Please let me know

[D4nte]

Indeed, I missed this one. Thanks!