After discussing this offline, we've decided that the naming of these
properties was misleading. This commit performs the following changes:
- `account.initialMP` becomes `account.bonusMP`
- `account.currentMP` becomes `account.totalMP`
Rationale:
`initialMP` indicates that this is an immutable field which is not the
case as in scenarios where accounts increase the `lock()` time, they'll
also increase their bonus multiplier (`initialMP`).
`currentMP` was misleading in combination with `initialMP`. Really what
it reflects is the total multiplier points of an account **including**
its bonus multiplier points.
A previous manager can only migrate once, because the migration address
is locked in. A **new** manager is always aware of its previous manager.
This means, when a migration happens and is initialized, we know for
sure it's always the first time this is happening.
We probably don't want a migration to take place if the new manager has
already processed epochs, so we're adding a check that its
`currentEpoch` must be `0`.
This also ensures one of its invariants isn't violated:
`epochsOnlyIncrease` and `highEpochsAreNull`.
This is actually a bug that the certora prover found.
The rule `epochStaysSameOnMigration` failed because a previous
`StakeManager` could call `migrationInitialize` and change
`currentEpoch` on a next `StakeManager`, even though the next `StakeManager`
might be in migration itself (which means the `currentEpoch` is now
allowed to change).
This commit fixes this by ensure `migrationInitialize()` will revert if
the `StakeManager` already has a `migration` on going.
This adds a test that ensures multiplier points are minted with a 1:1
ratio to the stake token amount.
This scenario covers the case where no lock up time is set during
staking.
Unstaking didn't actually work because it was using `transferFrom()` on the
`StakeVault` with the `from` address being the vault itself.
This would result in an approval error because the vault isn't creating
any approvals to spend its own funds.
The solution is to use `transfer` instead and ensuring the return value
is checked.
This commit introduces `MIN_LOCKUP_PERIOD` and `MAX_LOCKUP_PERIOD` and
makes use of them within `StakeManager.stake()` and
`StakeManager.lock()` accordingly.
When users deposit tokens into their vault via `stake()`, they can
provide an optional lockup time. If the value is `0` it implies users do
not want to lock their stake.
If the value is `> 0` it has to be within the range of
`MIN_LOCKUP_PERIOD` and `MAX_LOCKUP_PERIOD`.
Properly addresses #15
This commit introduces a first version of a `VaultFactory` that later
will be extended to be capable of instantiating reward vaults and
possible keep track of vault instances per owner.
As a first step, this implementation comes with a `createVault()`
function which takes care of creating vaults.
Because `VaultFactory` also knows about `StakeManager` it can derive the
manager's address and stake token from it when creating vaults, allowing
the API to be without arguments.
Partially addresses #37
Because the `stakedToken` property is `immutable`, solhint recommends to
make it in all caps. This commit changes the property to adhere to that
rule and also makes the property private.
To access the `stakedToken` there's now a `stakedToken()` function on
the contract.
This commit migrates the repo to our foundry template, which ensures we
have consistent tooling across smart contract repositories that are
maintained by Vac.
This removes all hardhat related files and workflows and replaces them
with more perfomant foundry workflows.
It also sets up tests, CI and linting.
Ricardo Guilherme Schmidt
r4bbit
Nurit Dor
Frederico Teixeira