Anchor Sunset. Review Scope.

Simple summary

The anchor-collateral-steth contains Ethereum contracts for integrating stETH as a collateral into the Anchor protocol in the form of bETH token.

Context

In June 2022, we created a post on the research forum in which we published a proposals to stop supporting Anchor integration. A snapshot was published too, that passed the vote.

The procedure is as follows:

upgrade contracts to prevent bETH from minting;
stop the bot accruing and distributing rewards;
allow withdrawal of user funds;
stop supporting the Anchor widget UI.

The main changes of AnchorVault contract should look like this:

add a deprecation notice
disable submit func
disable collect_rewards func
removed can_deposit_or_withdraw func
removed emergency_admin - only DAO can pause or resume the contract now
cleared up the contract - remove unused func/events/interfaces/ etc…

Note: wrt stETH rebases — rewards distribution discontinued and bETH holders redeem their stETH with 1:1 ratio except only for scaling penalties down on hypothetical severe protocol losses. See get_rate here

We removed everything unnecessary from the contract: unused func, constants, interfaces, etc.

Scope of the review

Code size: ~280 lines of Vyper, ~70 lines of Solidity(calculated by https://github.com/AlDanial/cloc)

The AnchorVault contract is supposed to be used as an implementation for the already deployed AnchorVaultProxy contract.