Rollover vault #112

aalavandhan · 2022-11-15T17:31:32Z

Users deposit AMPL for vault notes
Vault "deploys" ampl by tranching and performing rollover, it "recovers" AMPL by redeeming mature tranches
On redemption users get a slice of all the assets held by the vault

At any given time the vault could hold, the underlying asset (deposit asset AMPL), the earned asset (SPOT) and the deployed assets (tranches).

spot-contracts/contracts/_utils/BondHelpers.sol

spot-contracts/contracts/vaults/RolloverVault.sol

aalavandhan · 2023-02-10T15:12:17Z

spot-contracts/contracts/vaults/RolloverVault.sol

+                if (!bond.isMature()) {
+                    bond.mature();
+                }
+                bond.redeemMature(address(tranche), tranche.balanceOf(address(this)));


Something to be cognizant of is that this can revert when the entire supply is redeemed and brick our recoverAndRedeploy workflow.

https://github.com/buttonwood-protocol/tranche/blob/main/contracts/BondController.sol#L225

Options:

We could wrap around try-catch

Add logic to compute amounts discounting the min condition

Handle manually if we ever run into this (deposit small amount of funds into the bond)

@nms-7 @brandoniles

Oh, that's right, good point. Could happen on deposit too if we don't deploy enough. I would say (2) compute the amounts, but since MINIMUM_VALID_DEBT isn't exposed, (1) try-catch works

Yeah agree with @nms-7. #2 if it's possible.

I think try-catch is safe enough here though, since if it fails and continues, it's just a matter of lost capital efficiency. And it could be made more efficiently with a permissionless manual action.

brandoniles

This covers up through deposit() in RolloverVault.sol

spot-contracts/contracts/vaults/RolloverVault.sol

brandoniles · 2023-03-10T13:38:04Z

spot-contracts/contracts/vaults/RolloverVault.sol

+        _redeemTranches();
+    }
+
+    /// @notice Deposits the provided asset from {msg.sender} into the vault and mints notes.


Should probably add a note saying it could be a good idea to call recover and deploy afterward.

spot-contracts/contracts/vaults/RolloverVault.sol

Co-authored-by: Brandon Iles <brandon@fragments.org>

brandoniles

Covers up to right before the private write methods

brandoniles · 2023-03-17T15:54:14Z

spot-contracts/contracts/vaults/RolloverVault.sol

+    /// @return The amount of notes.
+    function deposit(IERC20Upgradeable token, uint256 amount) external nonReentrant whenNotPaused returns (uint256) {
+        // NOTE: The vault only accepts the underlying asset tokens.
+        if (token != underlying) {


Something I was thinking about was making underlying immutable to give another layer of protection. Anytime a caller can specify a token to interact with, there's some danger of malicious code injection.

We'd have to add a constructor, though, in addition to the init function.

I dont think we can have constructors in the proxy?

We could still get rid of the token parameter, don't think we need to generalize now. I'm okay with underlying not being strictly immutable, if the code doesn't have methods change it.

https://forum.openzeppelin.com/t/upgradable-contracts-instantiating-an-immutable-value/28763/2

Agree, that all sounds good to me 👍

spot-contracts/contracts/vaults/RolloverVault.sol

Co-authored-by: Brandon Iles <brandon@fragments.org>

spot-contracts/contracts/vaults/RolloverVault.sol

brandoniles

_rollover

spot-contracts/contracts/vaults/RolloverVault.sol

Co-authored-by: Brandon Iles <brandon@fragments.org>

brandoniles

LGTM

aalavandhan requested review from brandoniles and nms-7 November 15, 2022 17:31

aalavandhan force-pushed the rollover-vault branch 4 times, most recently from 2f93f0c to b15925c Compare November 16, 2022 14:46

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aalavandhan force-pushed the rollover-vault branch from 4a1c8de to 8e98164 Compare January 4, 2023 15:14

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aalavandhan changed the title ~~WIP: Rollover vault~~ Rollover vault Jan 18, 2023

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added helper to compute redeemable tranche balances

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reduced allowance to the amount to be transferred

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Rollover vault #112

Rollover vault #112

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Rollover vault #112

Rollover vault #112

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