Add Transfer schema + parse from trace

mev_inspect/schemas/transfers.py

@@ -0,0 +1,38 @@
+from typing import List
+
+from pydantic import BaseModel
+
+from .classified_traces import Classification, ClassifiedTrace, Protocol
+
+
+class Transfer(BaseModel):
+    transaction_hash: str
+    trace_address: List[int]
+    from_address: str
+    to_address: str
+    amount: int
+    token_address: str
+
+    @classmethod
+    def from_trace(cls, trace: ClassifiedTrace) -> "Transfer":
+        if trace.classification != Classification.transfer or trace.inputs is None:
+            raise ValueError("Invalid transfer")
+
+        if trace.protocol == Protocol.weth:
+            return cls(
+                transaction_hash=trace.transaction_hash,
+                trace_address=trace.trace_address,
+                amount=trace.inputs["wad"],
+                to_address=trace.inputs["dst"],
+                from_address=trace.from_address,
+                token_address=trace.to_address,
+            )
+        else:
+            return cls(
+                transaction_hash=trace.transaction_hash,
+                trace_address=trace.trace_address,
+                amount=trace.inputs["amount"],
+                to_address=trace.inputs["recipient"],
+                from_address=trace.inputs.get("sender", trace.from_address),
+                token_address=trace.to_address,
+            )