Contract

# @version 0.2.16
"""
@title Liquidity Gauge v4
@author StakeDAO Protocol
@license MIT
"""

# Original idea and credit:
# Curve Finance's veCRV
# https://github.com/curvefi/curve-dao-contracts/blob/master/contracts/gauges/LiquidityGaugeV4.vy
# Mostly forked from Curve, except that now there is no direct link between the gauge controller
# and the gauges. In this implementation, SDT rewards are like any other token rewards.

from vyper.interfaces import ERC20

interface VotingEscrow:
    def user_point_epoch(addr: address) -> uint256: view
    def user_point_history__ts(addr: address, epoch: uint256) -> uint256: view

interface VotingEscrowBoost:
    def adjusted_balance_of(_account: address) -> uint256: view

interface PoolRegistry: 
    def vaultMap(_poolId: uint256, _owner : address) -> address: view

event Deposit:
    provider: indexed(address)
    value: uint256

event Withdraw:
    provider: indexed(address)
    value: uint256

event UpdateLiquidityLimit:
    user: address
    original_balance: uint256
    original_supply: uint256
    working_balance: uint256
    working_supply: uint256

event CommitOwnership:
    admin: address

event ApplyOwnership:
    admin: address

event RewardDataUpdate:
    _token: indexed(address)
    _amount: uint256

struct Reward:
    token: address
    distributor: address
    period_finish: uint256
    rate: uint256
    last_update: uint256
    integral: uint256


MAX_REWARDS: constant(uint256) = 8
TOKENLESS_PRODUCTION: constant(uint256) = 40
WEEK: constant(uint256) = 604800

SDT: public(address)
voting_escrow: public(address)
veBoost_proxy: public(address)

balanceOf: public(HashMap[address, uint256])
totalSupply: public(uint256)

working_balances: public(HashMap[address, uint256])
working_supply: public(uint256)

integrate_checkpoint_of: public(HashMap[address, uint256])

# For tracking external rewards
reward_count: public(uint256)
reward_tokens: public(address[MAX_REWARDS])

reward_data: public(HashMap[address, Reward])

# claimant -> default reward receiver
rewards_receiver: public(HashMap[address, address])

# reward token -> claiming address -> integral
reward_integral_for: public(HashMap[address, HashMap[address, uint256]])

# user -> [uint128 claimable amount][uint128 claimed amount]
claim_data: HashMap[address, HashMap[address, uint256]]

admin: public(address)
future_admin: public(address)
claimer: public(address)
pool_registry: public(address)

initialized: public(bool)

pid: public(uint256)

@external
def __init__():
    """
    @notice Contract constructor
    @dev The contract has an initializer to prevent the take over of the implementation
    """
    assert self.initialized == False #dev: contract is already initialized
    self.initialized = True

@external
def initialize(_admin: address, _SDT: address, _voting_escrow: address, _veBoost_proxy: address, _distributor: address, _pid: uint256, _pool_registry: address):
    """
    @notice Contract initializer
    @param _admin Admin who can kill the gauge
    @param _SDT Address of the SDT token
    @param _voting_escrow Address of the veSDT contract
    @param _veBoost_proxy Address of the proxy contract used to query veSDT balances and taking into account potential delegations
    @param _distributor Address of the contract responsible for distributing SDT tokens to this gauge
    @param _pid pool id corresponding to this gauge
    @param _pool_registry Address of the pool registry contract
    """
    assert self.initialized == False #dev: contract is already initialized
    self.initialized = True

    assert _admin != ZERO_ADDRESS
    assert _SDT != ZERO_ADDRESS
    assert _voting_escrow != ZERO_ADDRESS
    assert _veBoost_proxy != ZERO_ADDRESS
    assert _distributor != ZERO_ADDRESS

    self.admin = _admin
    self.SDT = _SDT
    self.voting_escrow = _voting_escrow
    self.veBoost_proxy = _veBoost_proxy
    self.pid = _pid
    self.pool_registry = _pool_registry

    # add in all liquidityGauge the SDT reward - the distribution could be null though
    self.reward_data[_SDT].distributor = _distributor
    self.reward_tokens[0] = _SDT
    self.reward_count = 1
    

@internal
def _update_liquidity_limit(addr: address, l: uint256, L: uint256):
    """
    @notice Calculate limits which depend on the amount of SDT token per-user.
            Effectively it calculates working balances to apply amplification
            of SDT production by SDT
    @param addr User address
    @param l User's amount of liquidity (LP tokens)
    @param L Total amount of liquidity (LP tokens)
    """
    # To be called after totalSupply is updated
    voting_balance: uint256 = VotingEscrowBoost(self.veBoost_proxy).adjusted_balance_of(addr)
    voting_total: uint256 = ERC20(self.voting_escrow).totalSupply()

    lim: uint256 = l * TOKENLESS_PRODUCTION / 100
    if voting_total > 0:
        lim += L * voting_balance / voting_total * (100 - TOKENLESS_PRODUCTION) / 100

    lim = min(l, lim)
    old_bal: uint256 = self.working_balances[addr]
    self.working_balances[addr] = lim
    _working_supply: uint256 = self.working_supply + lim - old_bal
    self.working_supply = _working_supply

    log UpdateLiquidityLimit(addr, l, L, lim, _working_supply)


@internal
def _checkpoint_reward(_user: address, token: address, _total_supply: uint256, _user_balance: uint256, _claim: bool, receiver: address):
    """
    @notice Claim pending rewards and checkpoint rewards for a user
    @param _user Account to checkpoint reward for
    @param token Token to checkpoint reward for
    @param _total_supply Amount total deposited in the contract
    @param _user_balance Amount total deposited in the contract for _user
    @param _claim Bool to claim (or not) reward during the checkpoint
    @param receiver Address to transfer the claimed reward
    """
    total_supply: uint256 = _total_supply
    user_balance: uint256 = _user_balance
    if token == self.SDT : 
        total_supply = self.working_supply
        user_balance = self.working_balances[_user]

    integral: uint256 = self.reward_data[token].integral
    last_update: uint256 = min(block.timestamp, self.reward_data[token].period_finish)
    duration: uint256 = last_update - self.reward_data[token].last_update
    if duration != 0:
        self.reward_data[token].last_update = last_update
        if total_supply != 0:
            integral += duration * self.reward_data[token].rate * 10**18 / total_supply
            self.reward_data[token].integral = integral

    if _user != ZERO_ADDRESS:
        integral_for: uint256 = self.reward_integral_for[token][_user]
        new_claimable: uint256 = 0

        if integral_for < integral:
            self.reward_integral_for[token][_user] = integral
            new_claimable = user_balance * (integral - integral_for) / 10**18

        claim_data: uint256 = self.claim_data[_user][token]
        total_claimable: uint256 = shift(claim_data, -128) + new_claimable
        if total_claimable > 0:
            total_claimed: uint256 = claim_data % 2**128
            if _claim:
                response: Bytes[32] = raw_call(
                    token,
                    concat(
                        method_id("transfer(address,uint256)"),
                        convert(receiver, bytes32),
                        convert(total_claimable, bytes32),
                    ),
                    max_outsize=32,
                )
                if len(response) != 0:
                    assert convert(response, bool)
                self.claim_data[_user][token] = total_claimed + total_claimable
            elif new_claimable > 0:
                self.claim_data[_user][token] = total_claimed + shift(total_claimable, 128)
    
    if token == self.SDT : 
        self.integrate_checkpoint_of[_user] = block.timestamp
                
@internal
def _checkpoint_rewards(_user: address, _total_supply: uint256, _claim: bool, _receiver: address, _only_checkpoint:bool = False):
    """
    @notice Claim pending rewards and checkpoint rewards for a user
    @param _user Account to checkpoint reward for
    @param _total_supply Amount total deposited in the contract
    @param _user_balance Amount total deposited in the contract for _user
    @param _claim Bool to claim (or not) reward during the checkpoint
    @param _receiver Address to transfer the claimed reward
    @param _only_checkpoint Bool to call only checkpoint reward
    """

    receiver: address = _receiver
    user_balance: uint256 = 0
    if _user != ZERO_ADDRESS:
        user_balance = self.balanceOf[_user]
        if _claim and _receiver == ZERO_ADDRESS:
            # if receiver is not explicitly declared, check if a default receiver is set
            receiver = self.rewards_receiver[_user]
            if receiver == ZERO_ADDRESS:
                # if no default receiver is set, direct claims to the user
                receiver = _user

    if _only_checkpoint:
        self._checkpoint_reward(_user, self.SDT, _total_supply, user_balance, False, receiver)
    else:
        reward_count: uint256 = self.reward_count
        for i in range(MAX_REWARDS):
            if i == reward_count:
                break
            token: address = self.reward_tokens[i]
            self._checkpoint_reward(_user, token, _total_supply, user_balance, _claim, receiver)

@external
def user_checkpoint(addr: address) -> bool:
    """
    @notice Record a checkpoint for `addr`
    @param addr User address
    @return bool success
    """
    assert msg.sender == addr  # dev: unauthorized
    total_supply: uint256 = self.totalSupply
    self._checkpoint_rewards(addr, total_supply, False, ZERO_ADDRESS, True)
    self._update_liquidity_limit(addr, self.balanceOf[addr], total_supply)
    return True

@view
@external
def claimed_reward(_addr: address, _token: address) -> uint256:
    """
    @notice Get the number of already-claimed reward tokens for a user
    @param _addr Account to get reward amount for
    @param _token Token to get reward amount for
    @return uint256 Total amount of `_token` already claimed by `_addr`
    """
    return self.claim_data[_addr][_token] % 2**128


@view
@external
def claimable_reward(_user: address, _reward_token: address) -> uint256:
    """
    @notice Get the number of claimable reward tokens for a user
    @param _user Account to get reward amount for
    @param _reward_token Token to get reward amount for
    @return uint256 Claimable reward token amount
    """
    integral: uint256 = self.reward_data[_reward_token].integral
    total_supply: uint256 = self.totalSupply
    user_balance: uint256 = self.balanceOf[_user]
    if _reward_token == self.SDT: 
        total_supply = self.working_supply
        user_balance = self.working_balances[_user]
        
    if total_supply != 0:
        last_update: uint256 = min(block.timestamp, self.reward_data[_reward_token].period_finish)
        duration: uint256 = last_update - self.reward_data[_reward_token].last_update
        integral += (duration * self.reward_data[_reward_token].rate * 10**18 / total_supply)

    integral_for: uint256 = self.reward_integral_for[_reward_token][_user]
    new_claimable: uint256 = user_balance * (integral - integral_for) / 10**18

    return shift(self.claim_data[_user][_reward_token], -128) + new_claimable


@external
def set_rewards_receiver(_receiver: address):
    """
    @notice Set the default reward receiver for the caller.
    @dev When set to ZERO_ADDRESS, rewards are sent to the caller
    @param _receiver Receiver address for any rewards claimed via `claim_rewards`
    """
    self.rewards_receiver[msg.sender] = _receiver

@external
@nonreentrant('lock')
def claim_rewards(_addr: address = msg.sender, _receiver: address = ZERO_ADDRESS):
    """
    @notice Claim available reward tokens for `_addr`
    @param _addr Address to claim for
    @param _receiver Address to transfer rewards to - if set to
                     ZERO_ADDRESS, uses the default reward receiver
                     for the caller
    """
    if _receiver != ZERO_ADDRESS:
        assert _addr == msg.sender  # dev: cannot redirect when claiming for another user
    self._checkpoint_rewards(_addr, self.totalSupply, True, _receiver)

@external
@nonreentrant('lock')
def claim_rewards_for(_addr: address, _receiver: address):
    """
    @notice Claim available reward tokens for `_addr`
    @param _addr Address to claim for
    @param _receiver Address to transfer rewards to - if set to
                     ZERO_ADDRESS, uses the default reward receiver
                     for the caller
    """
    assert self.claimer == msg.sender  # dev: only the claim contract can claim for other 
    if _receiver != _addr:
        assert _receiver == self.claimer # dev: if the receiver is not the user it needs to be the claimer
    self._checkpoint_rewards(_addr, self.totalSupply, True, _receiver)


@external
def kick(addr: address):
    """
    @notice Kick `addr` for abusing their boost
    @dev Only if either they had another voting event, or their voting escrow lock expired
    @param addr Address to kick
    """
    t_last: uint256 = self.integrate_checkpoint_of[addr]
    t_ve: uint256 = VotingEscrow(self.voting_escrow).user_point_history__ts(
        addr, VotingEscrow(self.voting_escrow).user_point_epoch(addr)
    )
    _balance: uint256 = self.balanceOf[addr]

    assert ERC20(self.voting_escrow).balanceOf(addr) == 0 or t_ve > t_last # dev: kick not allowed
    assert self.working_balances[addr] > _balance * TOKENLESS_PRODUCTION / 100  # dev: kick not needed

    total_supply: uint256 = self.totalSupply
    self._checkpoint_rewards(addr, total_supply, False, ZERO_ADDRESS, True)

    self._update_liquidity_limit(addr, self.balanceOf[addr], total_supply)


@external
@nonreentrant('lock')
def deposit(_value: uint256, _addr: address , _claim_rewards: bool = False):
    """
    @notice Deposit `_value` LP tokens
    @dev Depositting also claims pending reward tokens
    @param _value Number of tokens to deposit
    @param _addr Address to deposit for
    @param _claim_rewards Bool to claim reward on _checkpoint_rewards()
    """
    #only personal vault can deposit
    assert PoolRegistry(self.pool_registry).vaultMap(self.pid, _addr) == msg.sender, "!only personal vault" 

    total_supply: uint256 = self.totalSupply

    if _value != 0:
        is_rewards: bool = self.reward_count != 0
        if is_rewards:
            self._checkpoint_rewards(_addr, total_supply, _claim_rewards, ZERO_ADDRESS)

        total_supply += _value
        new_balance: uint256 = self.balanceOf[_addr] + _value

        self.balanceOf[_addr] = new_balance
        self.totalSupply = total_supply

        self._update_liquidity_limit(_addr, new_balance, total_supply)
    else:
        self._checkpoint_rewards(_addr, total_supply, False, ZERO_ADDRESS, True)

    log Deposit(_addr, _value)

@external
@nonreentrant('lock')
def withdraw(_value: uint256, _addr: address, _claim_rewards: bool = False):
    """
    @notice Withdraw `_value` LP tokens
    @dev Withdrawing also claims pending reward tokens
    @param _value Number of tokens to withdraw
    @param _addr Address to withdraw for
    @param _claim_rewards Bool to claim reward on _checkpoint_rewards()
    """
    assert PoolRegistry(self.pool_registry).vaultMap(self.pid, _addr) == msg.sender, "!only personal vault" 
    total_supply: uint256 = self.totalSupply

    if _value != 0:
        is_rewards: bool = self.reward_count != 0
        if is_rewards:
            self._checkpoint_rewards(_addr, total_supply, _claim_rewards, ZERO_ADDRESS)

        total_supply -= _value
        new_balance: uint256 = self.balanceOf[_addr] - _value
        self.balanceOf[_addr] = new_balance
        self.totalSupply = total_supply

        self._update_liquidity_limit(_addr, new_balance, total_supply)
    else:
        self._checkpoint_rewards(_addr, total_supply, False, ZERO_ADDRESS, True)

    log Withdraw(_addr, _value)

@external
def add_reward(_reward_token: address, _distributor: address):
    """
    @notice Set the active reward contract
    @param _reward_token Address for new reward token
    @param _distributor Address of _reward_token distributor
    """
    assert msg.sender == self.admin  # dev: only owner

    reward_count: uint256 = self.reward_count
    assert reward_count < MAX_REWARDS
    assert self.reward_data[_reward_token].distributor == ZERO_ADDRESS

    self.reward_data[_reward_token].distributor = _distributor
    self.reward_tokens[reward_count] = _reward_token
    self.reward_count = reward_count + 1

@external
def set_reward_distributor(_reward_token: address, _distributor: address):
    """
    @notice Change address for a existring reward token distributor
    @param _reward_token Address of the reward token
    @param _distributor New address of the distributor
    """
    current_distributor: address = self.reward_data[_reward_token].distributor

    assert msg.sender == current_distributor or msg.sender == self.admin
    assert current_distributor != ZERO_ADDRESS
    assert _distributor != ZERO_ADDRESS

    self.reward_data[_reward_token].distributor = _distributor

@external
def set_claimer(_claimer: address):
    """
    @notice Change address for claimer
    @param _claimer New address for claimer
    """
    assert msg.sender == self.admin
    assert _claimer != ZERO_ADDRESS

    self.claimer = _claimer

@external
@nonreentrant("lock")
def deposit_reward_token(_reward_token: address, _amount: uint256):
    """
    @notice Depositing new amount of reward token into this LGV4
    @param _reward_token Address of the reward token
    @param _amount Amount of reward token to be deposited
    """
    assert msg.sender == self.reward_data[_reward_token].distributor

    self._checkpoint_rewards(ZERO_ADDRESS, self.totalSupply, False, ZERO_ADDRESS)

    response: Bytes[32] = raw_call(
        _reward_token,
        concat(
            method_id("transferFrom(address,address,uint256)"),
            convert(msg.sender, bytes32),
            convert(self, bytes32),
            convert(_amount, bytes32),
        ),
        max_outsize=32,
    )
    if len(response) != 0:
        assert convert(response, bool)

    period_finish: uint256 = self.reward_data[_reward_token].period_finish
    if block.timestamp >= period_finish:
        self.reward_data[_reward_token].rate = _amount / WEEK
    else:
        remaining: uint256 = period_finish - block.timestamp
        leftover: uint256 = remaining * self.reward_data[_reward_token].rate
        self.reward_data[_reward_token].rate = (_amount + leftover) / WEEK

    self.reward_data[_reward_token].last_update = block.timestamp
    self.reward_data[_reward_token].period_finish = block.timestamp + WEEK

    log RewardDataUpdate(_reward_token,_amount)

@external
def commit_transfer_ownership(addr: address):
    """
    @notice Transfer ownership of Gauge to `addr`
    @param addr Address to have ownership transferred to
    """
    assert msg.sender == self.admin  # dev: admin only
    assert addr != ZERO_ADDRESS  # dev: future admin cannot be the 0 address

    self.future_admin = addr
    log CommitOwnership(addr)


@external
def accept_transfer_ownership():
    """
    @notice Accept a pending ownership transfer
    """
    _admin: address = self.future_admin
    assert msg.sender == _admin  # dev: future admin only

    self.admin = _admin
    log ApplyOwnership(_admin)

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