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fix/enhancement: added bytes32 name/symbol support in get_token()#191

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Merged
ErikBjare merged 4 commits intouniswap-python:masterfromliquid-8:master
Oct 28, 2021
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263 changes: 263 additions & 0 deletionsuniswap/assets/erc20b32.abi
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,263 @@
[
{
"constant": true,
"inputs": [],
"name": "name",
"outputs": [
{
"name": "",
"type": "bytes32"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "symbol",
"outputs": [
{
"name": "",
"type": "bytes32"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "decimals",
"outputs": [
{
"name": "",
"type": "uint8"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "spender",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "approve",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "totalSupply",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "to",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "spender",
"type": "address"
},
{
"name": "addedValue",
"type": "uint256"
}
],
"name": "increaseAllowance",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "owner",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "spender",
"type": "address"
},
{
"name": "subtractedValue",
"type": "uint256"
}
],
"name": "decreaseAllowance",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "to",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "owner",
"type": "address"
},
{
"name": "spender",
"type": "address"
}
],
"name": "allowance",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "from",
"type": "address"
},
{
"indexed": true,
"name": "to",
"type": "address"
},
{
"indexed": false,
"name": "value",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "owner",
"type": "address"
},
{
"indexed": true,
"name": "spender",
"type": "address"
},
{
"indexed": false,
"name": "value",
"type": "uint256"
}
],
"name": "Approval",
"type": "event"
}
]
16 changes: 12 additions & 4 deletionsuniswap/uniswap.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -1172,22 +1172,30 @@ def _calculate_max_output_token(

# ------ Helpers ------------------------------------------------------------

def get_token(self, address: AddressLike) -> ERC20Token:
def get_token(self, address: AddressLike, abi_name:str="erc20") -> ERC20Token:
"""
Retrieves metadata from the ERC20 contract of a given token, like its name, symbol, and decimals.
"""
# FIXME: This function should always return the same output for the same input
# and would therefore benefit from caching
token_contract = _load_contract(self.w3, abi_name="erc20", address=address)
token_contract = _load_contract(self.w3, abi_name, address=address)
try:
name = token_contract.functions.name().call()
symbol = token_contract.functions.symbol().call()
_name = token_contract.functions.name().call()
_symbol = token_contract.functions.symbol().call()
decimals = token_contract.functions.decimals().call()
except Exception as e:
logger.warning(
f"Exception occurred while trying to get token {_addr_to_str(address)}: {e}"
)
raise InvalidToken(address)
try:
name = _name.decode()
except:
name = _name
try:
symbol = _symbol.decode()
except:
symbol = _symbol
return ERC20Token(symbol, address, name, decimals)

@functools.lru_cache()
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