92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
from typing import List, Optional
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from mev_inspect.schemas.classified_traces import (
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ClassifiedTrace,
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Classification,
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)
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from mev_inspect.schemas.swaps import Swap
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from mev_inspect.schemas.transfers import ERC20Transfer
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from mev_inspect.traces import get_traces_by_transaction_hash
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from mev_inspect.transfers import (
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get_child_transfers,
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filter_transfers,
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remove_child_transfers_of_transfers,
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)
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def get_swaps(traces: List[ClassifiedTrace]) -> List[Swap]:
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swaps = []
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for _, transaction_traces in get_traces_by_transaction_hash(traces).items():
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swaps += _get_swaps_for_transaction(list(transaction_traces))
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return swaps
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def _get_swaps_for_transaction(traces: List[ClassifiedTrace]) -> List[Swap]:
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ordered_traces = list(sorted(traces, key=lambda t: t.trace_address))
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swaps: List[Swap] = []
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prior_transfers: List[ERC20Transfer] = []
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for trace in ordered_traces:
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if trace.classification == Classification.transfer:
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prior_transfers.append(ERC20Transfer.from_trace(trace))
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elif trace.classification == Classification.swap:
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child_transfers = get_child_transfers(
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trace.transaction_hash,
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trace.trace_address,
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traces,
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)
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swap = _parse_swap(
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trace,
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remove_child_transfers_of_transfers(prior_transfers),
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remove_child_transfers_of_transfers(child_transfers),
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)
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if swap is not None:
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swaps.append(swap)
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return swaps
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def _parse_swap(
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trace: ClassifiedTrace,
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prior_transfers: List[ERC20Transfer],
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child_transfers: List[ERC20Transfer],
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) -> Optional[Swap]:
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pool_address = trace.to_address
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transfers_to_pool = filter_transfers(prior_transfers, to_address=pool_address)
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if len(transfers_to_pool) == 0:
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transfers_to_pool = filter_transfers(child_transfers, to_address=pool_address)
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if len(transfers_to_pool) == 0:
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raise RuntimeError("Expected at least one transfer to pool")
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transfers_from_pool = filter_transfers(child_transfers, from_address=pool_address)
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if len(transfers_from_pool) != 1:
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raise RuntimeError("Expected exactly one transfer from pool")
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transfer_in = transfers_to_pool[-1]
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transfer_out = transfers_from_pool[0]
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return Swap(
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abi_name=trace.abi_name,
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transaction_hash=trace.transaction_hash,
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block_number=trace.block_number,
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trace_address=trace.trace_address,
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pool_address=pool_address,
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from_address=transfer_in.from_address,
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to_address=transfer_out.to_address,
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token_in_address=transfer_in.token_address,
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token_in_amount=transfer_in.amount,
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token_out_address=transfer_out.token_address,
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token_out_amount=transfer_out.amount,
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error=trace.error,
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)
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