[Applicaton] Provable past delegations & delayed undelegations

[red-0ne]

Summary

Add EndBlockers keeper methods to:

• Process delayed undelegations to become effective at the next session
• Archive of old delegations to be used for past relay requests signature verification
• Prune archived delegations past a certain number of blocks

Update the RingClient and RingCache to use archived delegations when needed

Remove stale code implementing PubKeyClient

2255 added lines of code are auto-generated pulsar files

A followup PR for e2e testing the feature involving sending relays to gateways instead of self-signing AppGateServers will come after. E2E tests for:

• Delayed undelegation
• Delegation archival and pruning
• Undelegation overriding (undelegate A -> redelegate A before undelegation is effective)

Issue

• 476

Type of change

Select one or more:

• [x] New feature, functionality or library
• [ ] Bug fix
• [ ] Code health or cleanup
• [ ] Documentation
• [ ] Other (specify)

Testing

Documentation changes (only if making doc changes)

• [ ] make docusaurus_start; only needed if you make doc changes

Local Testing (only if making code changes)

• [x] Unit Tests: make go_develop_and_test
• [ ] LocalNet E2E Tests: make test_e2e
• See quickstart guide for instructions

PR Testing (only if making code changes)

• [ ] DevNet E2E Tests: Add the devnet-test-e2e label to the PR.
  • THIS IS VERY EXPENSIVE, so only do it after all the reviews are complete.
  • Optionally run make trigger_ci if you want to re-trigger tests without any code changes
  • If tests fail, try re-running failed tests only using the GitHub UI as shown here

Sanity Checklist

• [ ] I have tested my changes using the available tooling
• [x] I have commented my code
• [x] I have performed a self-review of my own code; both comments & source code
• [x] I create and reference any new tickets, if applicable
• [x] I have left TODOs throughout the codebase, if applicable

[Olshansk]

@red-0ne Aiming to take a look at this tomorrow.

[Olshansk]

Haven't started looking at the code yet but great PR summary @red-0ne!

[Olshansk]

Action Plan:

1. Refer to this comment: https://github.com/pokt-network/poktroll/issues/476#issuecomment-2052639906
2. Leave this PR as is: make it a draft and close later (or pick up) depending on how alterative solution evolves
3. Refer to pseudo-code below for attempt number
4. Feel free to copy-paste code from here (e.g. tests) in new PR

ClaimValidation() {
    addressesToBuildRing = getActiveGatewayAddr(app, currentSessionNumber)
}

func getActiveGatewayAddr(app, currSessNumber) {
    activeGateways = app.activeGateways
    for sessionNumber, pendingUndelegations := range app.pendingUndelegations {
        if sessionNumber < currSessNumber {
            activeGateways = append(activeGateways, pendingUndelegations...)
        }
    }
    return activeGateways
}

func EndBlocker() {
    cleanUpPendingUndelegations(currSessionNumber)
}

func cleanUpPendingUndelegations() {
    sessionNumbersToRemoveUndelegationsFor = someFunctionUsingGovParam(currSess, numSessionsToGoBack)
    for app := allApplications {
        for sess, undelegations := app.undelegations {
            if sess <sessionNumbersToRemoveUndelegationsFor {
                delete(app.undelegations, sess)
            }
        }
    }
}

[red-0ne]

Closing in favor of #518

[Olshansk]

Closing in favor of #518

Love two things about this:

1. We're biasing to a simpler solution straight away
2. We're keeping this as a reference in history for when we need it

💪