Race condition in PANDA

[burdges]

There are odd race conditions when users are trying to connect using PANDA, seemingly repeatedly miss-typing the shared secret, and deleting the spurious contacts before the other exchange takes place.

I've managed to have a two contacts for the same person both showing as paired correctly on my end :

• The first was deleted by the other person but I've his correct generation and can send to the server although he cannot receive from me.
• I get DELIVERY_SIGNATURE_INVALID when sending to the second, but no generation update.

Is there maybe a race condition between PANDA and the generation update?

[burdges]

I reproduced the DELIVERY_SIGNATURE_INVALID with another person by deleting a contact in the middle of a PANDA key exchange, but it "healed" after one failed attempt. I'll need to read the code to figure out what's going on here.

[burdges]

I'll close this since it's likely whatever happened here : https://github.com/agl/pond/issues/135#issuecomment-82386725