[SPEC] Message buffering in DKG to prevent initialisation bugs

[drewstone]

Overview

Upon a new authorities set notification the nodes start a new DKG process. We cannot guarantee a perfect simultaneous startup so in the current implementation some nodes might miss initial messages and be unable to further participate in the protocol.

Checklist

On every new DKG message:

• Iterate through the buffer and perform an action for each message. An action can be:
  • Feed the message to the corresponding rounds object if possible
  • Do nothing if the message is not considered expired yet.
  • Discard the message if it is expired
• Try to feed newly received message to the corresponding rounds object
• If there is no rounds object available, append the message to the buffer
• Define en expiration policy for buffered messages.

Issues

Linked tasks