Mixnode gracefully shutdown

[al8n]

Add a MixnodeHandle struct to deal with gracefully shutdown logic in mix node. With this change, we can also access the actual address the mix node is listening.

[youngjoon-lee]

Now that we use Overwatch for mixnode, can we close this PR? It seems nomos-node also doesn't have signal handling, if I understand correctly (I'm not 100% sure since I don't have much experience in Overwatch). What do you think about postponing this issue until we have a consistent way with Overwatch, if we don't have any critical issue?

[al8n]

Now that we use Overwatch for mixnode, can we close this PR? It seems nomos-node also doesn't have signal handling, if I understand correctly (I'm not 100% sure since I don't have much experience in Overwatch). What do you think about postponing this issue until we have a consistent way with Overwatch, if we don't have any critical issue?

Yeah, nomos-node does not have signal handling. This PR originally targets adding a Handle to get the correct port when the user gives a 0, so that we can use the criterion for the mixnet benchmark. If we do not need to handle that case anymore, I think we can close this one. Maybe it is better to add a graceful shutdown mechanism in Overwatch.

[danielSanchezQ]

Now that we use Overwatch for mixnode, can we close this PR? It seems nomos-node also doesn't have signal handling, if I understand correctly (I'm not 100% sure since I don't have much experience in Overwatch). What do you think about postponing this issue until we have a consistent way with Overwatch, if we don't have any critical issue?

Yeah, nomos-node does not have signal handling. This PR originally targets adding a Handle to get the correct port when the user gives a 0, so that we can use the criterion for the mixnet benchmark. If we do not need to handle that case anymore, I think we can close this one. Maybe it is better to add a graceful shutdown mechanism in Overwatch.

Yes, it was one of the issues in Overwatch iirc. If not it was one of the main things that was left to be implemented. I would encourage to implement there so it would benefit every binary.

[youngjoon-lee]

Yup. We can close this PR.