Transaction Hash:
Block:
10005610 at May-05-2020 10:10:41 AM +UTC
Transaction Fee:
0.0020058443235 ETH
$5.12
Gas Used:
46,647 Gas / 43.0005 Gwei
Account State Difference:
| Address | Before | After | State Difference | ||
|---|---|---|---|---|---|
| 0x4D17a537...068229c0a |
0.1507616864 Eth
Nonce: 13019
|
0.1487558420765 Eth
Nonce: 13020
| 0.0020058443235 | ||
|
0xEA674fdD...16B898ec8
Miner
| (Ethermine) | 756.765520215765785166 Eth | 756.767526060089285166 Eth | 0.0020058443235 |
Execution Trace
MEV Bot: 0x860...F66.c89e4361( )
0x2149b0f7ebf246076bdbbe98706578a0aa6c0464.689c49c0( )
Vyper_contract.getEthToTokenInputPrice( eth_sold=58651393811504714620 ) => ( out=11803940561323162132955 )
- Vyper_contract.getEthToTokenInputPrice( eth_sold=58651393811504714620 ) => ( out=11803940561323162132955 )
-
Dai.balanceOf( 0x2a1530C4C41db0B0b2bB646CB5Eb1A67b7158667 ) => ( 3646297098404378964347453 )
-
-
MatchingMarket.getBuyAmount( buy_gem=0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, pay_gem=0x6B175474E89094C44Da98b954EedeAC495271d0F, pay_amt=11803940561323162132955 ) => ( fill_amt=58638552217203984763 )
File 1 of 4: Vyper_contract
File 2 of 4: Vyper_contract
File 3 of 4: Dai
File 4 of 4: MatchingMarket
# @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]File 2 of 4: Vyper_contract
# @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]File 3 of 4: Dai
// hevm: flattened sources of /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol
pragma solidity =0.5.12;
////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/lib.sol
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
/* pragma solidity 0.5.12; */
contract LibNote {
event LogNote(
bytes4 indexed sig,
address indexed usr,
bytes32 indexed arg1,
bytes32 indexed arg2,
bytes data
) anonymous;
modifier note {
_;
assembly {
// log an 'anonymous' event with a constant 6 words of calldata
// and four indexed topics: selector, caller, arg1 and arg2
let mark := msize // end of memory ensures zero
mstore(0x40, add(mark, 288)) // update free memory pointer
mstore(mark, 0x20) // bytes type data offset
mstore(add(mark, 0x20), 224) // bytes size (padded)
calldatacopy(add(mark, 0x40), 0, 224) // bytes payload
log4(mark, 288, // calldata
shl(224, shr(224, calldataload(0))), // msg.sig
caller, // msg.sender
calldataload(4), // arg1
calldataload(36) // arg2
)
}
}
}
////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol
// Copyright (C) 2017, 2018, 2019 dbrock, rain, mrchico
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
/* pragma solidity 0.5.12; */
/* import "./lib.sol"; */
contract Dai is LibNote {
// --- Auth ---
mapping (address => uint) public wards;
function rely(address guy) external note auth { wards[guy] = 1; }
function deny(address guy) external note auth { wards[guy] = 0; }
modifier auth {
require(wards[msg.sender] == 1, "Dai/not-authorized");
_;
}
// --- ERC20 Data ---
string public constant name = "Dai Stablecoin";
string public constant symbol = "DAI";
string public constant version = "1";
uint8 public constant decimals = 18;
uint256 public totalSupply;
mapping (address => uint) public balanceOf;
mapping (address => mapping (address => uint)) public allowance;
mapping (address => uint) public nonces;
event Approval(address indexed src, address indexed guy, uint wad);
event Transfer(address indexed src, address indexed dst, uint wad);
// --- Math ---
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x);
}
function sub(uint x, uint y) internal pure returns (uint z) {
require((z = x - y) <= x);
}
// --- EIP712 niceties ---
bytes32 public DOMAIN_SEPARATOR;
// bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)");
bytes32 public constant PERMIT_TYPEHASH = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;
constructor(uint256 chainId_) public {
wards[msg.sender] = 1;
DOMAIN_SEPARATOR = keccak256(abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name)),
keccak256(bytes(version)),
chainId_,
address(this)
));
}
// --- Token ---
function transfer(address dst, uint wad) external returns (bool) {
return transferFrom(msg.sender, dst, wad);
}
function transferFrom(address src, address dst, uint wad)
public returns (bool)
{
require(balanceOf[src] >= wad, "Dai/insufficient-balance");
if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
require(allowance[src][msg.sender] >= wad, "Dai/insufficient-allowance");
allowance[src][msg.sender] = sub(allowance[src][msg.sender], wad);
}
balanceOf[src] = sub(balanceOf[src], wad);
balanceOf[dst] = add(balanceOf[dst], wad);
emit Transfer(src, dst, wad);
return true;
}
function mint(address usr, uint wad) external auth {
balanceOf[usr] = add(balanceOf[usr], wad);
totalSupply = add(totalSupply, wad);
emit Transfer(address(0), usr, wad);
}
function burn(address usr, uint wad) external {
require(balanceOf[usr] >= wad, "Dai/insufficient-balance");
if (usr != msg.sender && allowance[usr][msg.sender] != uint(-1)) {
require(allowance[usr][msg.sender] >= wad, "Dai/insufficient-allowance");
allowance[usr][msg.sender] = sub(allowance[usr][msg.sender], wad);
}
balanceOf[usr] = sub(balanceOf[usr], wad);
totalSupply = sub(totalSupply, wad);
emit Transfer(usr, address(0), wad);
}
function approve(address usr, uint wad) external returns (bool) {
allowance[msg.sender][usr] = wad;
emit Approval(msg.sender, usr, wad);
return true;
}
// --- Alias ---
function push(address usr, uint wad) external {
transferFrom(msg.sender, usr, wad);
}
function pull(address usr, uint wad) external {
transferFrom(usr, msg.sender, wad);
}
function move(address src, address dst, uint wad) external {
transferFrom(src, dst, wad);
}
// --- Approve by signature ---
function permit(address holder, address spender, uint256 nonce, uint256 expiry,
bool allowed, uint8 v, bytes32 r, bytes32 s) external
{
bytes32 digest =
keccak256(abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH,
holder,
spender,
nonce,
expiry,
allowed))
));
require(holder != address(0), "Dai/invalid-address-0");
require(holder == ecrecover(digest, v, r, s), "Dai/invalid-permit");
require(expiry == 0 || now <= expiry, "Dai/permit-expired");
require(nonce == nonces[holder]++, "Dai/invalid-nonce");
uint wad = allowed ? uint(-1) : 0;
allowance[holder][spender] = wad;
emit Approval(holder, spender, wad);
}
}File 4 of 4: MatchingMarket
/// matching_market.sol
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
pragma solidity ^0.5.12;
contract DSAuthority {
function canCall(
address src, address dst, bytes4 sig
) public view returns (bool);
}
contract DSAuthEvents {
event LogSetAuthority (address indexed authority);
event LogSetOwner (address indexed owner);
}
contract DSAuth is DSAuthEvents {
DSAuthority public authority;
address public owner;
constructor() public {
owner = msg.sender;
emit LogSetOwner(msg.sender);
}
function setOwner(address owner_)
public
auth
{
owner = owner_;
emit LogSetOwner(owner);
}
function setAuthority(DSAuthority authority_)
public
auth
{
authority = authority_;
emit LogSetAuthority(address(authority));
}
modifier auth {
require(isAuthorized(msg.sender, msg.sig), "ds-auth-unauthorized");
_;
}
function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
if (src == address(this)) {
return true;
} else if (src == owner) {
return true;
} else if (authority == DSAuthority(0)) {
return false;
} else {
return authority.canCall(src, address(this), sig);
}
}
}
contract DSMath {
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x, "ds-math-add-overflow");
}
function sub(uint x, uint y) internal pure returns (uint z) {
require((z = x - y) <= x, "ds-math-sub-underflow");
}
function mul(uint x, uint y) internal pure returns (uint z) {
require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
}
function min(uint x, uint y) internal pure returns (uint z) {
return x <= y ? x : y;
}
function max(uint x, uint y) internal pure returns (uint z) {
return x >= y ? x : y;
}
function imin(int x, int y) internal pure returns (int z) {
return x <= y ? x : y;
}
function imax(int x, int y) internal pure returns (int z) {
return x >= y ? x : y;
}
uint constant WAD = 10 ** 18;
uint constant RAY = 10 ** 27;
function wmul(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, y), WAD / 2) / WAD;
}
function rmul(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, y), RAY / 2) / RAY;
}
function wdiv(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, WAD), y / 2) / y;
}
function rdiv(uint x, uint y) internal pure returns (uint z) {
z = add(mul(x, RAY), y / 2) / y;
}
// This famous algorithm is called "exponentiation by squaring"
// and calculates x^n with x as fixed-point and n as regular unsigned.
//
// It's O(log n), instead of O(n) for naive repeated multiplication.
//
// These facts are why it works:
//
// If n is even, then x^n = (x^2)^(n/2).
// If n is odd, then x^n = x * x^(n-1),
// and applying the equation for even x gives
// x^n = x * (x^2)^((n-1) / 2).
//
// Also, EVM division is flooring and
// floor[(n-1) / 2] = floor[n / 2].
//
function rpow(uint x, uint n) internal pure returns (uint z) {
z = n % 2 != 0 ? x : RAY;
for (n /= 2; n != 0; n /= 2) {
x = rmul(x, x);
if (n % 2 != 0) {
z = rmul(z, x);
}
}
}
}
contract ERC20Events {
event Approval(address indexed src, address indexed guy, uint wad);
event Transfer(address indexed src, address indexed dst, uint wad);
}
contract ERC20 is ERC20Events {
function totalSupply() public view returns (uint);
function balanceOf(address guy) public view returns (uint);
function allowance(address src, address guy) public view returns (uint);
function approve(address guy, uint wad) public returns (bool);
function transfer(address dst, uint wad) public returns (bool);
function transferFrom(
address src, address dst, uint wad
) public returns (bool);
}
contract EventfulMarket {
event LogItemUpdate(uint id);
event LogTrade(uint pay_amt, address indexed pay_gem,
uint buy_amt, address indexed buy_gem);
event LogMake(
bytes32 indexed id,
bytes32 indexed pair,
address indexed maker,
ERC20 pay_gem,
ERC20 buy_gem,
uint128 pay_amt,
uint128 buy_amt,
uint64 timestamp
);
event LogBump(
bytes32 indexed id,
bytes32 indexed pair,
address indexed maker,
ERC20 pay_gem,
ERC20 buy_gem,
uint128 pay_amt,
uint128 buy_amt,
uint64 timestamp
);
event LogTake(
bytes32 id,
bytes32 indexed pair,
address indexed maker,
ERC20 pay_gem,
ERC20 buy_gem,
address indexed taker,
uint128 take_amt,
uint128 give_amt,
uint64 timestamp
);
event LogKill(
bytes32 indexed id,
bytes32 indexed pair,
address indexed maker,
ERC20 pay_gem,
ERC20 buy_gem,
uint128 pay_amt,
uint128 buy_amt,
uint64 timestamp
);
}
contract SimpleMarket is EventfulMarket, DSMath {
uint public last_offer_id;
mapping (uint => OfferInfo) public offers;
bool locked;
struct OfferInfo {
uint pay_amt;
ERC20 pay_gem;
uint buy_amt;
ERC20 buy_gem;
address owner;
uint64 timestamp;
}
modifier can_buy(uint id) {
require(isActive(id));
_;
}
modifier can_cancel(uint id) {
require(isActive(id));
require(getOwner(id) == msg.sender);
_;
}
modifier can_offer {
_;
}
modifier synchronized {
require(!locked);
locked = true;
_;
locked = false;
}
function isActive(uint id) public view returns (bool active) {
return offers[id].timestamp > 0;
}
function getOwner(uint id) public view returns (address owner) {
return offers[id].owner;
}
function getOffer(uint id) public view returns (uint, ERC20, uint, ERC20) {
OfferInfo memory offer = offers[id];
return (offer.pay_amt, offer.pay_gem,
offer.buy_amt, offer.buy_gem);
}
// ---- Public entrypoints ---- //
function bump(bytes32 id_)
public
can_buy(uint256(id_))
{
uint256 id = uint256(id_);
emit LogBump(
id_,
keccak256(abi.encodePacked(offers[id].pay_gem, offers[id].buy_gem)),
offers[id].owner,
offers[id].pay_gem,
offers[id].buy_gem,
uint128(offers[id].pay_amt),
uint128(offers[id].buy_amt),
offers[id].timestamp
);
}
// Accept given `quantity` of an offer. Transfers funds from caller to
// offer maker, and from market to caller.
function buy(uint id, uint quantity)
public
can_buy(id)
synchronized
returns (bool)
{
OfferInfo memory offer = offers[id];
uint spend = mul(quantity, offer.buy_amt) / offer.pay_amt;
require(uint128(spend) == spend);
require(uint128(quantity) == quantity);
// For backwards semantic compatibility.
if (quantity == 0 || spend == 0 ||
quantity > offer.pay_amt || spend > offer.buy_amt)
{
return false;
}
offers[id].pay_amt = sub(offer.pay_amt, quantity);
offers[id].buy_amt = sub(offer.buy_amt, spend);
require( offer.buy_gem.transferFrom(msg.sender, offer.owner, spend) );
require( offer.pay_gem.transfer(msg.sender, quantity) );
emit LogItemUpdate(id);
emit LogTake(
bytes32(id),
keccak256(abi.encodePacked(offer.pay_gem, offer.buy_gem)),
offer.owner,
offer.pay_gem,
offer.buy_gem,
msg.sender,
uint128(quantity),
uint128(spend),
uint64(now)
);
emit LogTrade(quantity, address(offer.pay_gem), spend, address(offer.buy_gem));
if (offers[id].pay_amt == 0) {
delete offers[id];
}
return true;
}
// Cancel an offer. Refunds offer maker.
function cancel(uint id)
public
can_cancel(id)
synchronized
returns (bool success)
{
// read-only offer. Modify an offer by directly accessing offers[id]
OfferInfo memory offer = offers[id];
delete offers[id];
require( offer.pay_gem.transfer(offer.owner, offer.pay_amt) );
emit LogItemUpdate(id);
emit LogKill(
bytes32(id),
keccak256(abi.encodePacked(offer.pay_gem, offer.buy_gem)),
offer.owner,
offer.pay_gem,
offer.buy_gem,
uint128(offer.pay_amt),
uint128(offer.buy_amt),
uint64(now)
);
success = true;
}
function kill(bytes32 id)
public
{
require(cancel(uint256(id)));
}
function make(
ERC20 pay_gem,
ERC20 buy_gem,
uint128 pay_amt,
uint128 buy_amt
)
public
returns (bytes32 id)
{
return bytes32(offer(pay_amt, pay_gem, buy_amt, buy_gem));
}
// Make a new offer. Takes funds from the caller into market escrow.
function offer(uint pay_amt, ERC20 pay_gem, uint buy_amt, ERC20 buy_gem)
public
can_offer
synchronized
returns (uint id)
{
require(uint128(pay_amt) == pay_amt);
require(uint128(buy_amt) == buy_amt);
require(pay_amt > 0);
require(pay_gem != ERC20(0x0));
require(buy_amt > 0);
require(buy_gem != ERC20(0x0));
require(pay_gem != buy_gem);
OfferInfo memory info;
info.pay_amt = pay_amt;
info.pay_gem = pay_gem;
info.buy_amt = buy_amt;
info.buy_gem = buy_gem;
info.owner = msg.sender;
info.timestamp = uint64(now);
id = _next_id();
offers[id] = info;
require( pay_gem.transferFrom(msg.sender, address(this), pay_amt) );
emit LogItemUpdate(id);
emit LogMake(
bytes32(id),
keccak256(abi.encodePacked(pay_gem, buy_gem)),
msg.sender,
pay_gem,
buy_gem,
uint128(pay_amt),
uint128(buy_amt),
uint64(now)
);
}
function take(bytes32 id, uint128 maxTakeAmount)
public
{
require(buy(uint256(id), maxTakeAmount));
}
function _next_id()
internal
returns (uint)
{
last_offer_id++; return last_offer_id;
}
}
// Simple Market with a market lifetime. When the close_time has been reached,
// offers can only be cancelled (offer and buy will throw).
contract ExpiringMarket is DSAuth, SimpleMarket {
uint64 public close_time;
bool public stopped;
// after close_time has been reached, no new offers are allowed
modifier can_offer {
require(!isClosed());
_;
}
// after close, no new buys are allowed
modifier can_buy(uint id) {
require(isActive(id));
require(!isClosed());
_;
}
// after close, anyone can cancel an offer
modifier can_cancel(uint id) {
require(isActive(id));
require((msg.sender == getOwner(id)) || isClosed());
_;
}
constructor(uint64 _close_time)
public
{
close_time = _close_time;
}
function isClosed() public view returns (bool closed) {
return stopped || getTime() > close_time;
}
function getTime() public view returns (uint64) {
return uint64(now);
}
function stop() public auth {
stopped = true;
}
}
contract DSNote {
event LogNote(
bytes4 indexed sig,
address indexed guy,
bytes32 indexed foo,
bytes32 indexed bar,
uint256 wad,
bytes fax
) anonymous;
modifier note {
bytes32 foo;
bytes32 bar;
uint256 wad;
assembly {
foo := calldataload(4)
bar := calldataload(36)
wad := callvalue
}
emit LogNote(msg.sig, msg.sender, foo, bar, wad, msg.data);
_;
}
}
contract MatchingEvents {
event LogBuyEnabled(bool isEnabled);
event LogMinSell(address pay_gem, uint min_amount);
event LogMatchingEnabled(bool isEnabled);
event LogUnsortedOffer(uint id);
event LogSortedOffer(uint id);
event LogInsert(address keeper, uint id);
event LogDelete(address keeper, uint id);
}
contract MatchingMarket is MatchingEvents, ExpiringMarket, DSNote {
bool public buyEnabled = true; //buy enabled
bool public matchingEnabled = true; //true: enable matching,
//false: revert to expiring market
struct sortInfo {
uint next; //points to id of next higher offer
uint prev; //points to id of previous lower offer
uint delb; //the blocknumber where this entry was marked for delete
}
mapping(uint => sortInfo) public _rank; //doubly linked lists of sorted offer ids
mapping(address => mapping(address => uint)) public _best; //id of the highest offer for a token pair
mapping(address => mapping(address => uint)) public _span; //number of offers stored for token pair in sorted orderbook
mapping(address => uint) public _dust; //minimum sell amount for a token to avoid dust offers
mapping(uint => uint) public _near; //next unsorted offer id
uint _head; //first unsorted offer id
uint public dustId; // id of the latest offer marked as dust
constructor(uint64 close_time) ExpiringMarket(close_time) public {
}
// After close, anyone can cancel an offer
modifier can_cancel(uint id) {
require(isActive(id), "Offer was deleted or taken, or never existed.");
require(
isClosed() || msg.sender == getOwner(id) || id == dustId,
"Offer can not be cancelled because user is not owner, and market is open, and offer sells required amount of tokens."
);
_;
}
// ---- Public entrypoints ---- //
function make(
ERC20 pay_gem,
ERC20 buy_gem,
uint128 pay_amt,
uint128 buy_amt
)
public
returns (bytes32)
{
return bytes32(offer(pay_amt, pay_gem, buy_amt, buy_gem));
}
function take(bytes32 id, uint128 maxTakeAmount) public {
require(buy(uint256(id), maxTakeAmount));
}
function kill(bytes32 id) public {
require(cancel(uint256(id)));
}
// Make a new offer. Takes funds from the caller into market escrow.
//
// If matching is enabled:
// * creates new offer without putting it in
// the sorted list.
// * available to authorized contracts only!
// * keepers should call insert(id,pos)
// to put offer in the sorted list.
//
// If matching is disabled:
// * calls expiring market's offer().
// * available to everyone without authorization.
// * no sorting is done.
//
function offer(
uint pay_amt, //maker (ask) sell how much
ERC20 pay_gem, //maker (ask) sell which token
uint buy_amt, //taker (ask) buy how much
ERC20 buy_gem //taker (ask) buy which token
)
public
returns (uint)
{
require(!locked, "Reentrancy attempt");
function (uint256,ERC20,uint256,ERC20) returns (uint256) fn = matchingEnabled ? _offeru : super.offer;
return fn(pay_amt, pay_gem, buy_amt, buy_gem);
}
// Make a new offer. Takes funds from the caller into market escrow.
function offer(
uint pay_amt, //maker (ask) sell how much
ERC20 pay_gem, //maker (ask) sell which token
uint buy_amt, //maker (ask) buy how much
ERC20 buy_gem, //maker (ask) buy which token
uint pos //position to insert offer, 0 should be used if unknown
)
public
can_offer
returns (uint)
{
return offer(pay_amt, pay_gem, buy_amt, buy_gem, pos, true);
}
function offer(
uint pay_amt, //maker (ask) sell how much
ERC20 pay_gem, //maker (ask) sell which token
uint buy_amt, //maker (ask) buy how much
ERC20 buy_gem, //maker (ask) buy which token
uint pos, //position to insert offer, 0 should be used if unknown
bool rounding //match "close enough" orders?
)
public
can_offer
returns (uint)
{
require(!locked, "Reentrancy attempt");
require(_dust[address(pay_gem)] <= pay_amt);
if (matchingEnabled) {
return _matcho(pay_amt, pay_gem, buy_amt, buy_gem, pos, rounding);
}
return super.offer(pay_amt, pay_gem, buy_amt, buy_gem);
}
//Transfers funds from caller to offer maker, and from market to caller.
function buy(uint id, uint amount)
public
can_buy(id)
returns (bool)
{
require(!locked, "Reentrancy attempt");
function (uint256,uint256) returns (bool) fn = matchingEnabled ? _buys : super.buy;
return fn(id, amount);
}
// Cancel an offer. Refunds offer maker.
function cancel(uint id)
public
can_cancel(id)
returns (bool success)
{
require(!locked, "Reentrancy attempt");
if (matchingEnabled) {
if (isOfferSorted(id)) {
require(_unsort(id));
} else {
require(_hide(id));
}
}
return super.cancel(id); //delete the offer.
}
//insert offer into the sorted list
//keepers need to use this function
function insert(
uint id, //maker (ask) id
uint pos //position to insert into
)
public
returns (bool)
{
require(!locked, "Reentrancy attempt");
require(!isOfferSorted(id)); //make sure offers[id] is not yet sorted
require(isActive(id)); //make sure offers[id] is active
_hide(id); //remove offer from unsorted offers list
_sort(id, pos); //put offer into the sorted offers list
emit LogInsert(msg.sender, id);
return true;
}
//deletes _rank [id]
// Function should be called by keepers.
function del_rank(uint id)
public
returns (bool)
{
require(!locked, "Reentrancy attempt");
require(!isActive(id) && _rank[id].delb != 0 && _rank[id].delb < block.number - 10);
delete _rank[id];
emit LogDelete(msg.sender, id);
return true;
}
//set the minimum sell amount for a token
// Function is used to avoid "dust offers" that have
// very small amount of tokens to sell, and it would
// cost more gas to accept the offer, than the value
// of tokens received.
function setMinSell(
ERC20 pay_gem, //token to assign minimum sell amount to
uint dust //maker (ask) minimum sell amount
)
public
auth
note
returns (bool)
{
_dust[address(pay_gem)] = dust;
emit LogMinSell(address(pay_gem), dust);
return true;
}
//returns the minimum sell amount for an offer
function getMinSell(
ERC20 pay_gem //token for which minimum sell amount is queried
)
public
view
returns (uint)
{
return _dust[address(pay_gem)];
}
//set buy functionality enabled/disabled
function setBuyEnabled(bool buyEnabled_) public auth returns (bool) {
buyEnabled = buyEnabled_;
emit LogBuyEnabled(buyEnabled);
return true;
}
//set matching enabled/disabled
// If matchingEnabled true(default), then inserted offers are matched.
// Except the ones inserted by contracts, because those end up
// in the unsorted list of offers, that must be later sorted by
// keepers using insert().
// If matchingEnabled is false then MatchingMarket is reverted to ExpiringMarket,
// and matching is not done, and sorted lists are disabled.
function setMatchingEnabled(bool matchingEnabled_) public auth returns (bool) {
matchingEnabled = matchingEnabled_;
emit LogMatchingEnabled(matchingEnabled);
return true;
}
//return the best offer for a token pair
// the best offer is the lowest one if it's an ask,
// and highest one if it's a bid offer
function getBestOffer(ERC20 sell_gem, ERC20 buy_gem) public view returns(uint) {
return _best[address(sell_gem)][address(buy_gem)];
}
//return the next worse offer in the sorted list
// the worse offer is the higher one if its an ask,
// a lower one if its a bid offer,
// and in both cases the newer one if they're equal.
function getWorseOffer(uint id) public view returns(uint) {
return _rank[id].prev;
}
//return the next better offer in the sorted list
// the better offer is in the lower priced one if its an ask,
// the next higher priced one if its a bid offer
// and in both cases the older one if they're equal.
function getBetterOffer(uint id) public view returns(uint) {
return _rank[id].next;
}
//return the amount of better offers for a token pair
function getOfferCount(ERC20 sell_gem, ERC20 buy_gem) public view returns(uint) {
return _span[address(sell_gem)][address(buy_gem)];
}
//get the first unsorted offer that was inserted by a contract
// Contracts can't calculate the insertion position of their offer because it is not an O(1) operation.
// Their offers get put in the unsorted list of offers.
// Keepers can calculate the insertion position offchain and pass it to the insert() function to insert
// the unsorted offer into the sorted list. Unsorted offers will not be matched, but can be bought with buy().
function getFirstUnsortedOffer() public view returns(uint) {
return _head;
}
//get the next unsorted offer
// Can be used to cycle through all the unsorted offers.
function getNextUnsortedOffer(uint id) public view returns(uint) {
return _near[id];
}
function isOfferSorted(uint id) public view returns(bool) {
return _rank[id].next != 0
|| _rank[id].prev != 0
|| _best[address(offers[id].pay_gem)][address(offers[id].buy_gem)] == id;
}
function sellAllAmount(ERC20 pay_gem, uint pay_amt, ERC20 buy_gem, uint min_fill_amount)
public
returns (uint fill_amt)
{
require(!locked, "Reentrancy attempt");
uint offerId;
while (pay_amt > 0) { //while there is amount to sell
offerId = getBestOffer(buy_gem, pay_gem); //Get the best offer for the token pair
require(offerId != 0); //Fails if there are not more offers
// There is a chance that pay_amt is smaller than 1 wei of the other token
if (pay_amt * 1 ether < wdiv(offers[offerId].buy_amt, offers[offerId].pay_amt)) {
break; //We consider that all amount is sold
}
if (pay_amt >= offers[offerId].buy_amt) { //If amount to sell is higher or equal than current offer amount to buy
fill_amt = add(fill_amt, offers[offerId].pay_amt); //Add amount bought to acumulator
pay_amt = sub(pay_amt, offers[offerId].buy_amt); //Decrease amount to sell
take(bytes32(offerId), uint128(offers[offerId].pay_amt)); //We take the whole offer
} else { // if lower
uint256 baux = rmul(pay_amt * 10 ** 9, rdiv(offers[offerId].pay_amt, offers[offerId].buy_amt)) / 10 ** 9;
fill_amt = add(fill_amt, baux); //Add amount bought to acumulator
take(bytes32(offerId), uint128(baux)); //We take the portion of the offer that we need
pay_amt = 0; //All amount is sold
}
}
require(fill_amt >= min_fill_amount);
}
function buyAllAmount(ERC20 buy_gem, uint buy_amt, ERC20 pay_gem, uint max_fill_amount)
public
returns (uint fill_amt)
{
require(!locked, "Reentrancy attempt");
uint offerId;
while (buy_amt > 0) { //Meanwhile there is amount to buy
offerId = getBestOffer(buy_gem, pay_gem); //Get the best offer for the token pair
require(offerId != 0);
// There is a chance that buy_amt is smaller than 1 wei of the other token
if (buy_amt * 1 ether < wdiv(offers[offerId].pay_amt, offers[offerId].buy_amt)) {
break; //We consider that all amount is sold
}
if (buy_amt >= offers[offerId].pay_amt) { //If amount to buy is higher or equal than current offer amount to sell
fill_amt = add(fill_amt, offers[offerId].buy_amt); //Add amount sold to acumulator
buy_amt = sub(buy_amt, offers[offerId].pay_amt); //Decrease amount to buy
take(bytes32(offerId), uint128(offers[offerId].pay_amt)); //We take the whole offer
} else { //if lower
fill_amt = add(fill_amt, rmul(buy_amt * 10 ** 9, rdiv(offers[offerId].buy_amt, offers[offerId].pay_amt)) / 10 ** 9); //Add amount sold to acumulator
take(bytes32(offerId), uint128(buy_amt)); //We take the portion of the offer that we need
buy_amt = 0; //All amount is bought
}
}
require(fill_amt <= max_fill_amount);
}
function getBuyAmount(ERC20 buy_gem, ERC20 pay_gem, uint pay_amt) public view returns (uint fill_amt) {
uint256 offerId = getBestOffer(buy_gem, pay_gem); //Get best offer for the token pair
while (pay_amt > offers[offerId].buy_amt) {
fill_amt = add(fill_amt, offers[offerId].pay_amt); //Add amount to buy accumulator
pay_amt = sub(pay_amt, offers[offerId].buy_amt); //Decrease amount to pay
if (pay_amt > 0) { //If we still need more offers
offerId = getWorseOffer(offerId); //We look for the next best offer
require(offerId != 0); //Fails if there are not enough offers to complete
}
}
fill_amt = add(fill_amt, rmul(pay_amt * 10 ** 9, rdiv(offers[offerId].pay_amt, offers[offerId].buy_amt)) / 10 ** 9); //Add proportional amount of last offer to buy accumulator
}
function getPayAmount(ERC20 pay_gem, ERC20 buy_gem, uint buy_amt) public view returns (uint fill_amt) {
uint256 offerId = getBestOffer(buy_gem, pay_gem); //Get best offer for the token pair
while (buy_amt > offers[offerId].pay_amt) {
fill_amt = add(fill_amt, offers[offerId].buy_amt); //Add amount to pay accumulator
buy_amt = sub(buy_amt, offers[offerId].pay_amt); //Decrease amount to buy
if (buy_amt > 0) { //If we still need more offers
offerId = getWorseOffer(offerId); //We look for the next best offer
require(offerId != 0); //Fails if there are not enough offers to complete
}
}
fill_amt = add(fill_amt, rmul(buy_amt * 10 ** 9, rdiv(offers[offerId].buy_amt, offers[offerId].pay_amt)) / 10 ** 9); //Add proportional amount of last offer to pay accumulator
}
// ---- Internal Functions ---- //
function _buys(uint id, uint amount)
internal
returns (bool)
{
require(buyEnabled);
if (amount == offers[id].pay_amt) {
if (isOfferSorted(id)) {
//offers[id] must be removed from sorted list because all of it is bought
_unsort(id);
}else{
_hide(id);
}
}
require(super.buy(id, amount));
// If offer has become dust during buy, we cancel it
if (isActive(id) && offers[id].pay_amt < _dust[address(offers[id].pay_gem)]) {
dustId = id; //enable current msg.sender to call cancel(id)
cancel(id);
}
return true;
}
//find the id of the next higher offer after offers[id]
function _find(uint id)
internal
view
returns (uint)
{
require( id > 0 );
address buy_gem = address(offers[id].buy_gem);
address pay_gem = address(offers[id].pay_gem);
uint top = _best[pay_gem][buy_gem];
uint old_top = 0;
// Find the larger-than-id order whose successor is less-than-id.
while (top != 0 && _isPricedLtOrEq(id, top)) {
old_top = top;
top = _rank[top].prev;
}
return old_top;
}
//find the id of the next higher offer after offers[id]
function _findpos(uint id, uint pos)
internal
view
returns (uint)
{
require(id > 0);
// Look for an active order.
while (pos != 0 && !isActive(pos)) {
pos = _rank[pos].prev;
}
if (pos == 0) {
//if we got to the end of list without a single active offer
return _find(id);
} else {
// if we did find a nearby active offer
// Walk the order book down from there...
if(_isPricedLtOrEq(id, pos)) {
uint old_pos;
// Guaranteed to run at least once because of
// the prior if statements.
while (pos != 0 && _isPricedLtOrEq(id, pos)) {
old_pos = pos;
pos = _rank[pos].prev;
}
return old_pos;
// ...or walk it up.
} else {
while (pos != 0 && !_isPricedLtOrEq(id, pos)) {
pos = _rank[pos].next;
}
return pos;
}
}
}
//return true if offers[low] priced less than or equal to offers[high]
function _isPricedLtOrEq(
uint low, //lower priced offer's id
uint high //higher priced offer's id
)
internal
view
returns (bool)
{
return mul(offers[low].buy_amt, offers[high].pay_amt)
>= mul(offers[high].buy_amt, offers[low].pay_amt);
}
//these variables are global only because of solidity local variable limit
//match offers with taker offer, and execute token transactions
function _matcho(
uint t_pay_amt, //taker sell how much
ERC20 t_pay_gem, //taker sell which token
uint t_buy_amt, //taker buy how much
ERC20 t_buy_gem, //taker buy which token
uint pos, //position id
bool rounding //match "close enough" orders?
)
internal
returns (uint id)
{
uint best_maker_id; //highest maker id
uint t_buy_amt_old; //taker buy how much saved
uint m_buy_amt; //maker offer wants to buy this much token
uint m_pay_amt; //maker offer wants to sell this much token
// there is at least one offer stored for token pair
while (_best[address(t_buy_gem)][address(t_pay_gem)] > 0) {
best_maker_id = _best[address(t_buy_gem)][address(t_pay_gem)];
m_buy_amt = offers[best_maker_id].buy_amt;
m_pay_amt = offers[best_maker_id].pay_amt;
// Ugly hack to work around rounding errors. Based on the idea that
// the furthest the amounts can stray from their "true" values is 1.
// Ergo the worst case has t_pay_amt and m_pay_amt at +1 away from
// their "correct" values and m_buy_amt and t_buy_amt at -1.
// Since (c - 1) * (d - 1) > (a + 1) * (b + 1) is equivalent to
// c * d > a * b + a + b + c + d, we write...
if (mul(m_buy_amt, t_buy_amt) > mul(t_pay_amt, m_pay_amt) +
(rounding ? m_buy_amt + t_buy_amt + t_pay_amt + m_pay_amt : 0))
{
break;
}
// ^ The `rounding` parameter is a compromise borne of a couple days
// of discussion.
buy(best_maker_id, min(m_pay_amt, t_buy_amt));
t_buy_amt_old = t_buy_amt;
t_buy_amt = sub(t_buy_amt, min(m_pay_amt, t_buy_amt));
t_pay_amt = mul(t_buy_amt, t_pay_amt) / t_buy_amt_old;
if (t_pay_amt == 0 || t_buy_amt == 0) {
break;
}
}
if (t_buy_amt > 0 && t_pay_amt > 0 && t_pay_amt >= _dust[address(t_pay_gem)]) {
//new offer should be created
id = super.offer(t_pay_amt, t_pay_gem, t_buy_amt, t_buy_gem);
//insert offer into the sorted list
_sort(id, pos);
}
}
// Make a new offer without putting it in the sorted list.
// Takes funds from the caller into market escrow.
// ****Available to authorized contracts only!**********
// Keepers should call insert(id,pos) to put offer in the sorted list.
function _offeru(
uint pay_amt, //maker (ask) sell how much
ERC20 pay_gem, //maker (ask) sell which token
uint buy_amt, //maker (ask) buy how much
ERC20 buy_gem //maker (ask) buy which token
)
internal
returns (uint id)
{
require(_dust[address(pay_gem)] <= pay_amt);
id = super.offer(pay_amt, pay_gem, buy_amt, buy_gem);
_near[id] = _head;
_head = id;
emit LogUnsortedOffer(id);
}
//put offer into the sorted list
function _sort(
uint id, //maker (ask) id
uint pos //position to insert into
)
internal
{
require(isActive(id));
ERC20 buy_gem = offers[id].buy_gem;
ERC20 pay_gem = offers[id].pay_gem;
uint prev_id; //maker (ask) id
pos = pos == 0 || offers[pos].pay_gem != pay_gem || offers[pos].buy_gem != buy_gem || !isOfferSorted(pos)
?
_find(id)
:
_findpos(id, pos);
if (pos != 0) { //offers[id] is not the highest offer
//requirement below is satisfied by statements above
//require(_isPricedLtOrEq(id, pos));
prev_id = _rank[pos].prev;
_rank[pos].prev = id;
_rank[id].next = pos;
} else { //offers[id] is the highest offer
prev_id = _best[address(pay_gem)][address(buy_gem)];
_best[address(pay_gem)][address(buy_gem)] = id;
}
if (prev_id != 0) { //if lower offer does exist
//requirement below is satisfied by statements above
//require(!_isPricedLtOrEq(id, prev_id));
_rank[prev_id].next = id;
_rank[id].prev = prev_id;
}
_span[address(pay_gem)][address(buy_gem)]++;
emit LogSortedOffer(id);
}
// Remove offer from the sorted list (does not cancel offer)
function _unsort(
uint id //id of maker (ask) offer to remove from sorted list
)
internal
returns (bool)
{
address buy_gem = address(offers[id].buy_gem);
address pay_gem = address(offers[id].pay_gem);
require(_span[pay_gem][buy_gem] > 0);
require(_rank[id].delb == 0 && //assert id is in the sorted list
isOfferSorted(id));
if (id != _best[pay_gem][buy_gem]) { // offers[id] is not the highest offer
require(_rank[_rank[id].next].prev == id);
_rank[_rank[id].next].prev = _rank[id].prev;
} else { //offers[id] is the highest offer
_best[pay_gem][buy_gem] = _rank[id].prev;
}
if (_rank[id].prev != 0) { //offers[id] is not the lowest offer
require(_rank[_rank[id].prev].next == id);
_rank[_rank[id].prev].next = _rank[id].next;
}
_span[pay_gem][buy_gem]--;
_rank[id].delb = block.number; //mark _rank[id] for deletion
return true;
}
//Hide offer from the unsorted order book (does not cancel offer)
function _hide(
uint id //id of maker offer to remove from unsorted list
)
internal
returns (bool)
{
uint uid = _head; //id of an offer in unsorted offers list
uint pre = uid; //id of previous offer in unsorted offers list
require(!isOfferSorted(id)); //make sure offer id is not in sorted offers list
if (_head == id) { //check if offer is first offer in unsorted offers list
_head = _near[id]; //set head to new first unsorted offer
_near[id] = 0; //delete order from unsorted order list
return true;
}
while (uid > 0 && uid != id) { //find offer in unsorted order list
pre = uid;
uid = _near[uid];
}
if (uid != id) { //did not find offer id in unsorted offers list
return false;
}
_near[pre] = _near[id]; //set previous unsorted offer to point to offer after offer id
_near[id] = 0; //delete order from unsorted order list
return true;
}
}