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# @title Uniswap Exchange Interface V1
# @notice Source code found at https://github.com/uniswap
# @notice Use at your own risk
contract Factory():
def getExchange(token_addr: address) -> address: constant
contract Exchange():
def getEthToTokenOutputPrice(tokens_bought: uint256) -> uint256(wei): constant
def ethToTokenTransferInput(min_tokens: uint256, deadline: timestamp, recipient: address) -> uint256: modifying
def ethToTokenTransferOutput(tokens_bought: uint256, deadline: timestamp, recipient: address) -> uint256(wei): modifying
TokenPurchase: event({buyer: indexed(address), eth_sold: indexed(uint256(wei)), tokens_bought: indexed(uint256)})
EthPurchase: event({buyer: indexed(address), tokens_sold: indexed(uint256), eth_bought: indexed(uint256(wei))})
AddLiquidity: event({provider: indexed(address), eth_amount: indexed(uint256(wei)), token_amount: indexed(uint256)})
RemoveLiquidity: event({provider: indexed(address), eth_amount: indexed(uint256(wei)), token_amount: indexed(uint256)})
Transfer: event({_from: indexed(address), _to: indexed(address), _value: uint256})
Approval: event({_owner: indexed(address), _spender: indexed(address), _value: uint256})
name: public(bytes32) # Uniswap V1
symbol: public(bytes32) # UNI-V1
decimals: public(uint256) # 18
totalSupply: public(uint256) # total number of UNI in existence
balances: uint256[address] # UNI balance of an address
allowances: (uint256[address])[address] # UNI allowance of one address on another
token: address(ERC20) # address of the ERC20 token traded on this contract
factory: Factory # interface for the factory that created this contract
# @dev This function acts as a contract constructor which is not currently supported in contracts deployed
# using create_with_code_of(). It is called once by the factory during contract creation.
@public
def setup(token_addr: address):
assert (self.factory == ZERO_ADDRESS and self.token == ZERO_ADDRESS) and token_addr != ZERO_ADDRESS
self.factory = msg.sender
self.token = token_addr
self.name = 0x556e697377617020563100000000000000000000000000000000000000000000
self.symbol = 0x554e492d56310000000000000000000000000000000000000000000000000000
self.decimals = 18
# @notice Deposit ETH and Tokens (self.token) at current ratio to mint UNI tokens.
# @dev min_liquidity does nothing when total UNI supply is 0.
# @param min_liquidity Minimum number of UNI sender will mint if total UNI supply is greater than 0.
# @param max_tokens Maximum number of tokens deposited. Deposits max amount if total UNI supply is 0.
# @param deadline Time after which this transaction can no longer be executed.
# @return The amount of UNI minted.
@public
@payable
def addLiquidity(min_liquidity: uint256, max_tokens: uint256, deadline: timestamp) -> uint256:
assert deadline > block.timestamp and (max_tokens > 0 and msg.value > 0)
total_liquidity: uint256 = self.totalSupply
if total_liquidity > 0:
assert min_liquidity > 0
eth_reserve: uint256(wei) = self.balance - msg.value
token_reserve: uint256 = self.token.balanceOf(self)
token_amount: uint256 = msg.value * token_reserve / eth_reserve + 1
liquidity_minted: uint256 = msg.value * total_liquidity / eth_reserve
assert max_tokens >= token_amount and liquidity_minted >= min_liquidity
self.balances[msg.sender] += liquidity_minted
self.totalSupply = total_liquidity + liquidity_minted
assert self.token.transferFrom(msg.sender, self, token_amount)
log.AddLiquidity(msg.sender, msg.value, token_amount)
log.Transfer(ZERO_ADDRESS, msg.sender, liquidity_minted)
return liquidity_minted
else:
assert (self.factory != ZERO_ADDRESS and self.token != ZERO_ADDRESS) and msg.value >= 1000000000
assert self.factory.getExchange(self.token) == self
token_amount: uint256 = max_tokens
initial_liquidity: uint256 = as_unitless_number(self.balance)
self.totalSupply = initial_liquidity
self.balances[msg.sender] = initial_liquidity
assert self.token.transferFrom(msg.sender, self, token_amount)
log.AddLiquidity(msg.sender, msg.value, token_amount)
log.Transfer(ZERO_ADDRESS, msg.sender, initial_liquidity)
return initial_liquidity
# @dev Burn UNI tokens to withdraw ETH and Tokens at current ratio.
# @param amount Amount of UNI burned.
# @param min_eth Minimum ETH withdrawn.
# @param min_tokens Minimum Tokens withdrawn.
# @param deadline Time after which this transaction can no longer be executed.
# @return The amount of ETH and Tokens withdrawn.
@public
def removeLiquidity(amount: uint256, min_eth: uint256(wei), min_tokens: uint256, deadline: timestamp) -> (uint256(wei), uint256):
assert (amount > 0 and deadline > block.timestamp) and (min_eth > 0 and min_tokens > 0)
total_liquidity: uint256 = self.totalSupply
assert total_liquidity > 0
token_reserve: uint256 = self.token.balanceOf(self)
eth_amount: uint256(wei) = amount * self.balance / total_liquidity
token_amount: uint256 = amount * token_reserve / total_liquidity
assert eth_amount >= min_eth and token_amount >= min_tokens
self.balances[msg.sender] -= amount
self.totalSupply = total_liquidity - amount
send(msg.sender, eth_amount)
assert self.token.transfer(msg.sender, token_amount)
log.RemoveLiquidity(msg.sender, eth_amount, token_amount)
log.Transfer(msg.sender, ZERO_ADDRESS, amount)
return eth_amount, token_amount
# @dev Pricing function for converting between ETH and Tokens.
# @param input_amount Amount of ETH or Tokens being sold.
# @param input_reserve Amount of ETH or Tokens (input type) in exchange reserves.
# @param output_reserve Amount of ETH or Tokens (output type) in exchange reserves.
# @return Amount of ETH or Tokens bought.
@private
@constant
def getInputPrice(input_amount: uint256, input_reserve: uint256, output_reserve: uint256) -> uint256:
assert input_reserve > 0 and output_reserve > 0
input_amount_with_fee: uint256 = input_amount * 997
numerator: uint256 = input_amount_with_fee * output_reserve
denominator: uint256 = (input_reserve * 1000) + input_amount_with_fee
return numerator / denominator
# @dev Pricing function for converting between ETH and Tokens.
# @param output_amount Amount of ETH or Tokens being bought.
# @param input_reserve Amount of ETH or Tokens (input type) in exchange reserves.
# @param output_reserve Amount of ETH or Tokens (output type) in exchange reserves.
# @return Amount of ETH or Tokens sold.
@private
@constant
def getOutputPrice(output_amount: uint256, input_reserve: uint256, output_reserve: uint256) -> uint256:
assert input_reserve > 0 and output_reserve > 0
numerator: uint256 = input_reserve * output_amount * 1000
denominator: uint256 = (output_reserve - output_amount) * 997
return numerator / denominator + 1
@private
def ethToTokenInput(eth_sold: uint256(wei), min_tokens: uint256, deadline: timestamp, buyer: address, recipient: address) -> uint256:
assert deadline >= block.timestamp and (eth_sold > 0 and min_tokens > 0)
token_reserve: uint256 = self.token.balanceOf(self)
tokens_bought: uint256 = self.getInputPrice(as_unitless_number(eth_sold), as_unitless_number(self.balance - eth_sold), token_reserve)
assert tokens_bought >= min_tokens
assert self.token.transfer(recipient, tokens_bought)
log.TokenPurchase(buyer, eth_sold, tokens_bought)
return tokens_bought
# @notice Convert ETH to Tokens.
# @dev User specifies exact input (msg.value).
# @dev User cannot specify minimum output or deadline.
@public
@payable
def __default__():
self.ethToTokenInput(msg.value, 1, block.timestamp, msg.sender, msg.sender)
# @notice Convert ETH to Tokens.
# @dev User specifies exact input (msg.value) and minimum output.
# @param min_tokens Minimum Tokens bought.
# @param deadline Time after which this transaction can no longer be executed.
# @return Amount of Tokens bought.
@public
@payable
def ethToTokenSwapInput(min_tokens: uint256, deadline: timestamp) -> uint256:
return self.ethToTokenInput(msg.value, min_tokens, deadline, msg.sender, msg.sender)
# @notice Convert ETH to Tokens and transfers Tokens to recipient.
# @dev User specifies exact input (msg.value) and minimum output
# @param min_tokens Minimum Tokens bought.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output Tokens.
# @return Amount of Tokens bought.
@public
@payable
def ethToTokenTransferInput(min_tokens: uint256, deadline: timestamp, recipient: address) -> uint256:
assert recipient != self and recipient != ZERO_ADDRESS
return self.ethToTokenInput(msg.value, min_tokens, deadline, msg.sender, recipient)
@private
def ethToTokenOutput(tokens_bought: uint256, max_eth: uint256(wei), deadline: timestamp, buyer: address, recipient: address) -> uint256(wei):
assert deadline >= block.timestamp and (tokens_bought > 0 and max_eth > 0)
token_reserve: uint256 = self.token.balanceOf(self)
eth_sold: uint256 = self.getOutputPrice(tokens_bought, as_unitless_number(self.balance - max_eth), token_reserve)
# Throws if eth_sold > max_eth
eth_refund: uint256(wei) = max_eth - as_wei_value(eth_sold, 'wei')
if eth_refund > 0:
send(buyer, eth_refund)
assert self.token.transfer(recipient, tokens_bought)
log.TokenPurchase(buyer, as_wei_value(eth_sold, 'wei'), tokens_bought)
return as_wei_value(eth_sold, 'wei')
# @notice Convert ETH to Tokens.
# @dev User specifies maximum input (msg.value) and exact output.
# @param tokens_bought Amount of tokens bought.
# @param deadline Time after which this transaction can no longer be executed.
# @return Amount of ETH sold.
@public
@payable
def ethToTokenSwapOutput(tokens_bought: uint256, deadline: timestamp) -> uint256(wei):
return self.ethToTokenOutput(tokens_bought, msg.value, deadline, msg.sender, msg.sender)
# @notice Convert ETH to Tokens and transfers Tokens to recipient.
# @dev User specifies maximum input (msg.value) and exact output.
# @param tokens_bought Amount of tokens bought.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output Tokens.
# @return Amount of ETH sold.
@public
@payable
def ethToTokenTransferOutput(tokens_bought: uint256, deadline: timestamp, recipient: address) -> uint256(wei):
assert recipient != self and recipient != ZERO_ADDRESS
return self.ethToTokenOutput(tokens_bought, msg.value, deadline, msg.sender, recipient)
@private
def tokenToEthInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp, buyer: address, recipient: address) -> uint256(wei):
assert deadline >= block.timestamp and (tokens_sold > 0 and min_eth > 0)
token_reserve: uint256 = self.token.balanceOf(self)
eth_bought: uint256 = self.getInputPrice(tokens_sold, token_reserve, as_unitless_number(self.balance))
wei_bought: uint256(wei) = as_wei_value(eth_bought, 'wei')
assert wei_bought >= min_eth
send(recipient, wei_bought)
assert self.token.transferFrom(buyer, self, tokens_sold)
log.EthPurchase(buyer, tokens_sold, wei_bought)
return wei_bought
# @notice Convert Tokens to ETH.
# @dev User specifies exact input and minimum output.
# @param tokens_sold Amount of Tokens sold.
# @param min_eth Minimum ETH purchased.
# @param deadline Time after which this transaction can no longer be executed.
# @return Amount of ETH bought.
@public
def tokenToEthSwapInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp) -> uint256(wei):
return self.tokenToEthInput(tokens_sold, min_eth, deadline, msg.sender, msg.sender)
# @notice Convert Tokens to ETH and transfers ETH to recipient.
# @dev User specifies exact input and minimum output.
# @param tokens_sold Amount of Tokens sold.
# @param min_eth Minimum ETH purchased.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output ETH.
# @return Amount of ETH bought.
@public
def tokenToEthTransferInput(tokens_sold: uint256, min_eth: uint256(wei), deadline: timestamp, recipient: address) -> uint256(wei):
assert recipient != self and recipient != ZERO_ADDRESS
return self.tokenToEthInput(tokens_sold, min_eth, deadline, msg.sender, recipient)
@private
def tokenToEthOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp, buyer: address, recipient: address) -> uint256:
assert deadline >= block.timestamp and eth_bought > 0
token_reserve: uint256 = self.token.balanceOf(self)
tokens_sold: uint256 = self.getOutputPrice(as_unitless_number(eth_bought), token_reserve, as_unitless_number(self.balance))
# tokens sold is always > 0
assert max_tokens >= tokens_sold
send(recipient, eth_bought)
assert self.token.transferFrom(buyer, self, tokens_sold)
log.EthPurchase(buyer, tokens_sold, eth_bought)
return tokens_sold
# @notice Convert Tokens to ETH.
# @dev User specifies maximum input and exact output.
# @param eth_bought Amount of ETH purchased.
# @param max_tokens Maximum Tokens sold.
# @param deadline Time after which this transaction can no longer be executed.
# @return Amount of Tokens sold.
@public
def tokenToEthSwapOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp) -> uint256:
return self.tokenToEthOutput(eth_bought, max_tokens, deadline, msg.sender, msg.sender)
# @notice Convert Tokens to ETH and transfers ETH to recipient.
# @dev User specifies maximum input and exact output.
# @param eth_bought Amount of ETH purchased.
# @param max_tokens Maximum Tokens sold.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output ETH.
# @return Amount of Tokens sold.
@public
def tokenToEthTransferOutput(eth_bought: uint256(wei), max_tokens: uint256, deadline: timestamp, recipient: address) -> uint256:
assert recipient != self and recipient != ZERO_ADDRESS
return self.tokenToEthOutput(eth_bought, max_tokens, deadline, msg.sender, recipient)
@private
def tokenToTokenInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, buyer: address, recipient: address, exchange_addr: address) -> uint256:
assert (deadline >= block.timestamp and tokens_sold > 0) and (min_tokens_bought > 0 and min_eth_bought > 0)
assert exchange_addr != self and exchange_addr != ZERO_ADDRESS
token_reserve: uint256 = self.token.balanceOf(self)
eth_bought: uint256 = self.getInputPrice(tokens_sold, token_reserve, as_unitless_number(self.balance))
wei_bought: uint256(wei) = as_wei_value(eth_bought, 'wei')
assert wei_bought >= min_eth_bought
assert self.token.transferFrom(buyer, self, tokens_sold)
tokens_bought: uint256 = Exchange(exchange_addr).ethToTokenTransferInput(min_tokens_bought, deadline, recipient, value=wei_bought)
log.EthPurchase(buyer, tokens_sold, wei_bought)
return tokens_bought
# @notice Convert Tokens (self.token) to Tokens (token_addr).
# @dev User specifies exact input and minimum output.
# @param tokens_sold Amount of Tokens sold.
# @param min_tokens_bought Minimum Tokens (token_addr) purchased.
# @param min_eth_bought Minimum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param token_addr The address of the token being purchased.
# @return Amount of Tokens (token_addr) bought.
@public
def tokenToTokenSwapInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, token_addr: address) -> uint256:
exchange_addr: address = self.factory.getExchange(token_addr)
return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, msg.sender, exchange_addr)
# @notice Convert Tokens (self.token) to Tokens (token_addr) and transfers
# Tokens (token_addr) to recipient.
# @dev User specifies exact input and minimum output.
# @param tokens_sold Amount of Tokens sold.
# @param min_tokens_bought Minimum Tokens (token_addr) purchased.
# @param min_eth_bought Minimum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output ETH.
# @param token_addr The address of the token being purchased.
# @return Amount of Tokens (token_addr) bought.
@public
def tokenToTokenTransferInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, recipient: address, token_addr: address) -> uint256:
exchange_addr: address = self.factory.getExchange(token_addr)
return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, recipient, exchange_addr)
@private
def tokenToTokenOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, buyer: address, recipient: address, exchange_addr: address) -> uint256:
assert deadline >= block.timestamp and (tokens_bought > 0 and max_eth_sold > 0)
assert exchange_addr != self and exchange_addr != ZERO_ADDRESS
eth_bought: uint256(wei) = Exchange(exchange_addr).getEthToTokenOutputPrice(tokens_bought)
token_reserve: uint256 = self.token.balanceOf(self)
tokens_sold: uint256 = self.getOutputPrice(as_unitless_number(eth_bought), token_reserve, as_unitless_number(self.balance))
# tokens sold is always > 0
assert max_tokens_sold >= tokens_sold and max_eth_sold >= eth_bought
assert self.token.transferFrom(buyer, self, tokens_sold)
eth_sold: uint256(wei) = Exchange(exchange_addr).ethToTokenTransferOutput(tokens_bought, deadline, recipient, value=eth_bought)
log.EthPurchase(buyer, tokens_sold, eth_bought)
return tokens_sold
# @notice Convert Tokens (self.token) to Tokens (token_addr).
# @dev User specifies maximum input and exact output.
# @param tokens_bought Amount of Tokens (token_addr) bought.
# @param max_tokens_sold Maximum Tokens (self.token) sold.
# @param max_eth_sold Maximum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param token_addr The address of the token being purchased.
# @return Amount of Tokens (self.token) sold.
@public
def tokenToTokenSwapOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, token_addr: address) -> uint256:
exchange_addr: address = self.factory.getExchange(token_addr)
return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, msg.sender, exchange_addr)
# @notice Convert Tokens (self.token) to Tokens (token_addr) and transfers
# Tokens (token_addr) to recipient.
# @dev User specifies maximum input and exact output.
# @param tokens_bought Amount of Tokens (token_addr) bought.
# @param max_tokens_sold Maximum Tokens (self.token) sold.
# @param max_eth_sold Maximum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output ETH.
# @param token_addr The address of the token being purchased.
# @return Amount of Tokens (self.token) sold.
@public
def tokenToTokenTransferOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, recipient: address, token_addr: address) -> uint256:
exchange_addr: address = self.factory.getExchange(token_addr)
return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, recipient, exchange_addr)
# @notice Convert Tokens (self.token) to Tokens (exchange_addr.token).
# @dev Allows trades through contracts that were not deployed from the same factory.
# @dev User specifies exact input and minimum output.
# @param tokens_sold Amount of Tokens sold.
# @param min_tokens_bought Minimum Tokens (token_addr) purchased.
# @param min_eth_bought Minimum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param exchange_addr The address of the exchange for the token being purchased.
# @return Amount of Tokens (exchange_addr.token) bought.
@public
def tokenToExchangeSwapInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, exchange_addr: address) -> uint256:
return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, msg.sender, exchange_addr)
# @notice Convert Tokens (self.token) to Tokens (exchange_addr.token) and transfers
# Tokens (exchange_addr.token) to recipient.
# @dev Allows trades through contracts that were not deployed from the same factory.
# @dev User specifies exact input and minimum output.
# @param tokens_sold Amount of Tokens sold.
# @param min_tokens_bought Minimum Tokens (token_addr) purchased.
# @param min_eth_bought Minimum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output ETH.
# @param exchange_addr The address of the exchange for the token being purchased.
# @return Amount of Tokens (exchange_addr.token) bought.
@public
def tokenToExchangeTransferInput(tokens_sold: uint256, min_tokens_bought: uint256, min_eth_bought: uint256(wei), deadline: timestamp, recipient: address, exchange_addr: address) -> uint256:
assert recipient != self
return self.tokenToTokenInput(tokens_sold, min_tokens_bought, min_eth_bought, deadline, msg.sender, recipient, exchange_addr)
# @notice Convert Tokens (self.token) to Tokens (exchange_addr.token).
# @dev Allows trades through contracts that were not deployed from the same factory.
# @dev User specifies maximum input and exact output.
# @param tokens_bought Amount of Tokens (token_addr) bought.
# @param max_tokens_sold Maximum Tokens (self.token) sold.
# @param max_eth_sold Maximum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param exchange_addr The address of the exchange for the token being purchased.
# @return Amount of Tokens (self.token) sold.
@public
def tokenToExchangeSwapOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, exchange_addr: address) -> uint256:
return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, msg.sender, exchange_addr)
# @notice Convert Tokens (self.token) to Tokens (exchange_addr.token) and transfers
# Tokens (exchange_addr.token) to recipient.
# @dev Allows trades through contracts that were not deployed from the same factory.
# @dev User specifies maximum input and exact output.
# @param tokens_bought Amount of Tokens (token_addr) bought.
# @param max_tokens_sold Maximum Tokens (self.token) sold.
# @param max_eth_sold Maximum ETH purchased as intermediary.
# @param deadline Time after which this transaction can no longer be executed.
# @param recipient The address that receives output ETH.
# @param token_addr The address of the token being purchased.
# @return Amount of Tokens (self.token) sold.
@public
def tokenToExchangeTransferOutput(tokens_bought: uint256, max_tokens_sold: uint256, max_eth_sold: uint256(wei), deadline: timestamp, recipient: address, exchange_addr: address) -> uint256:
assert recipient != self
return self.tokenToTokenOutput(tokens_bought, max_tokens_sold, max_eth_sold, deadline, msg.sender, recipient, exchange_addr)
# @notice Public price function for ETH to Token trades with an exact input.
# @param eth_sold Amount of ETH sold.
# @return Amount of Tokens that can be bought with input ETH.
@public
@constant
def getEthToTokenInputPrice(eth_sold: uint256(wei)) -> uint256:
assert eth_sold > 0
token_reserve: uint256 = self.token.balanceOf(self)
return self.getInputPrice(as_unitless_number(eth_sold), as_unitless_number(self.balance), token_reserve)
# @notice Public price function for ETH to Token trades with an exact output.
# @param tokens_bought Amount of Tokens bought.
# @return Amount of ETH needed to buy output Tokens.
@public
@constant
def getEthToTokenOutputPrice(tokens_bought: uint256) -> uint256(wei):
assert tokens_bought > 0
token_reserve: uint256 = self.token.balanceOf(self)
eth_sold: uint256 = self.getOutputPrice(tokens_bought, as_unitless_number(self.balance), token_reserve)
return as_wei_value(eth_sold, 'wei')
# @notice Public price function for Token to ETH trades with an exact input.
# @param tokens_sold Amount of Tokens sold.
# @return Amount of ETH that can be bought with input Tokens.
@public
@constant
def getTokenToEthInputPrice(tokens_sold: uint256) -> uint256(wei):
assert tokens_sold > 0
token_reserve: uint256 = self.token.balanceOf(self)
eth_bought: uint256 = self.getInputPrice(tokens_sold, token_reserve, as_unitless_number(self.balance))
return as_wei_value(eth_bought, 'wei')
# @notice Public price function for Token to ETH trades with an exact output.
# @param eth_bought Amount of output ETH.
# @return Amount of Tokens needed to buy output ETH.
@public
@constant
def getTokenToEthOutputPrice(eth_bought: uint256(wei)) -> uint256:
assert eth_bought > 0
token_reserve: uint256 = self.token.balanceOf(self)
return self.getOutputPrice(as_unitless_number(eth_bought), token_reserve, as_unitless_number(self.balance))
# @return Address of Token that is sold on this exchange.
@public
@constant
def tokenAddress() -> address:
return self.token
# @return Address of factory that created this exchange.
@public
@constant
def factoryAddress() -> address(Factory):
return self.factory
# ERC20 compatibility for exchange liquidity modified from
# https://github.com/ethereum/vyper/blob/master/examples/tokens/ERC20.vy
@public
@constant
def balanceOf(_owner : address) -> uint256:
return self.balances[_owner]
@public
def transfer(_to : address, _value : uint256) -> bool:
self.balances[msg.sender] -= _value
self.balances[_to] += _value
log.Transfer(msg.sender, _to, _value)
return True
@public
def transferFrom(_from : address, _to : address, _value : uint256) -> bool:
self.balances[_from] -= _value
self.balances[_to] += _value
self.allowances[_from][msg.sender] -= _value
log.Transfer(_from, _to, _value)
return True
@public
def approve(_spender : address, _value : uint256) -> bool:
self.allowances[msg.sender][_spender] = _value
log.Approval(msg.sender, _spender, _value)
return True
@public
@constant
def allowance(_owner : address, _spender : address) -> uint256:
return self.allowances[_owner][_spender]