Multiple relay instances

[gkc]

Is your feature request related to a problem? Please describe.

Ensure that multiple instances of a given relay (srvd) can run concurrently

Describe the solution you'd like

Ensure that multiple instances of a given relay (srvd) can run concurrently

Describe alternatives you've considered

No response

Additional context

No response

[gkc]

@cconstab I've run tests with latest versions and this appears to work just fine. I searched for a ticket which described the issue which was previously noted (I think by you) but could not find it.

I will try earlier releases of the clients to see if they had a problem or not

[gkc]

The issue occurs with releases 5.0.2, 5.2.0 and 5.5.0

Technically the underlying issue (a race condition) exists in the current version also, although I can't make it affect a session.

I will fix the race condition; however, this obviously won't change existing clients in the field, therefore I will need to make changes on the srvd side as well. The simplest path is to use a server-side mutex

• implement this enhancement to atProtocol
• modify srvd so that when it receives a request it attempts to create an immutable key
• if it succeeds then it handles the session; if not then it doesn't try to handle the session

@cconstab Any other ideas?

[gkc]

2 SP for the srvd changes and testing. Most of the effort was in the implementation of atsign-foundation/at_protocol#65