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Send storage read errors to stderr and tidy up #231

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Send storage read errors to stderr and tidy up #231

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10 changes: 7 additions & 3 deletions slot_diff_attest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -147,12 +147,16 @@ def main() -> None:
print("⚠️ Target has no contract code — likely an EOA (reads will be zero).")
if not code: print("❌ Target has no contract code (EOA)."); sys.exit(2)

try:
try:
v_a = w3.eth.get_storage_at(address, slot, block_identifier=block_a)
v_b = w3.eth.get_storage_at(address, slot, block_identifier=block_b)
if v_a in (None, b"") or v_b in (None, b""): print("❌ Historical storage unavailable (archive node required)."); sys.exit(2)
if v_a in (None, b"") or v_b in (None, b""):
print("❌ Historical storage unavailable (archive node required).", file=sys.stderr)
sys.exit(2)
except Exception as e:
print(f"❌ Storage read failed: {e}"); sys.exit(2)
print(f"❌ Storage read failed: {e}", file=sys.stderr)
sys.exit(2)


leaf_a = leaf_commitment(chain_id, address, slot, block_a, v_a)
leaf_b = leaf_commitment(chain_id, address, slot, block_b, v_b)
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