crowetic/mev-inspect-py
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add constants and exceptions

Browse Source
This commit is contained in:
Gui Heise 2021-11-23 10:38:02 -05:00
parent 4c643a2d9f
commit d75e9b76ab
2 changed files with 40 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
mev_inspect/classifiers/helpers.py
View File

@ -86,14 +86,16 @@ def _filter_transfers(
return filtered_transfers
def get_amount_transferred_to_address(address: str, transfers: List[Transfer]) -> int:
def get_first_amount_transferred_to_address(
address: str, transfers: List[Transfer]
) -> int:
for transfer in transfers:
if transfer.to_address == address:
return transfer.amount
return 0
def get_amount_transferred_by_token_address(
def get_first_amount_transferred_by_token_address(
token_address: str, transfers: List[Transfer]
) -> int:
for transfer in transfers:

53
mev_inspect/classifiers/specs/zero_ex.py
View File

@ -10,8 +10,8 @@ from mev_inspect.schemas.classifiers import (
SwapClassifier,
)
from mev_inspect.classifiers.helpers import (
get_amount_transferred_to_address,
get_amount_transferred_by_token_address,
get_first_amount_transferred_to_address,
get_first_amount_transferred_by_token_address,
)
@ -23,37 +23,56 @@ class ZeroExSwapClassifier(SwapClassifier):
child_transfers: List[Transfer],
) -> Optional[Swap]:
token_in_amount: int = 0
taker_address: str = ""
ANY_TAKER = "0x0000000000000000000000000000000000000000"
RFQ_SIGNATURES = [
"fillRfqOrder((address,address,uint128,uint128,address,address,address,bytes32,uint64,uint256),(uint8,uint8,bytes32,bytes32),uint128)",
"_fillRfqOrder((address,address,uint128,uint128,address,address,address,bytes32,uint64,uint256),(uint8,uint8,bytes32,bytes32),uint128,address,bool,address)",
]
LIMIT_SIGNATURES = [
"fillOrKillLimitOrder((address,address,uint128,uint128,uint128,address,address,address,address,bytes32,uint64,uint256),(uint8,uint8,bytes32,bytes32),uint128)",
"fillLimitOrder((address,address,uint128,uint128,uint128,address,address,address,address,bytes32,uint64,uint256),(uint8,uint8,bytes32,bytes32),uint128)",
"_fillLimitOrder((address,address,uint128,uint128,uint128,address,address,address,address,bytes32,uint64,uint256),(uint8,uint8,bytes32,bytes32),uint128,address,address)",
]
# Assumptions:
# 1. There should be 2 child transfers, one for each settled leg of the order
if len(child_transfers) != 2:
raise ValueError(
f"A settled order should consist of 2 child transfers, not {len(child_transfers)}."
)
# 2. The function signature must be in the lists of supported signatures
if trace.function_signature not in (LIMIT_SIGNATURES + RFQ_SIGNATURES):
raise RuntimeError(
f"0x orderbook function {trace.function_signature} is not supported"
)
# The position of the token addresses and presence of takerTokenFillAmount
# is always ensured across order formats
order: List = trace.inputs["order"]
token_in_address: str = order[0]
token_out_address: str = order[1]
token_out_amount = trace.inputs["takerTokenFillAmount"]
if "Rfq" in trace.function_signature:
# Find token in amount
if trace.function_signature in RFQ_SIGNATURES:
taker_address = order[5]
elif "Limit" in trace.function_signature:
elif trace.function_signature in LIMIT_SIGNATURES:
taker_address = order[6]
else:
raise RuntimeError(
f"Unknown 0x orderbook function: {trace.function_signature}"
)
token_out_amount = trace.inputs["takerTokenFillAmount"]
if taker_address == "0x0000000000000000000000000000000000000000":
token_in_amount = get_amount_transferred_by_token_address(
if taker_address == ANY_TAKER:
token_in_amount = get_first_amount_transferred_by_token_address(
token_in_address, child_transfers
)
else:
token_in_amount = get_amount_transferred_to_address(
token_in_amount = get_first_amount_transferred_to_address(
taker_address, child_transfers
)