The bug is in the Python wrapper layer (hypersync/__init__.py)

[Pratham6392]

Issue

In the CallDecoder class if I do something like this :

**cd = hypersync.CallDecoder(["transfer(address,uint256)"])
cd.decode_inputs_sync(["0xa9059cbb..."])**

This throws an error :

• AttributeError: ... has no attribute 'decode_input_syncs'
• or TypeError: ... 'builtin_function_or_method' ... cannot be converted to 'Sequence'

The core issue in hypersync/init.py file :

async def decode_inputs(self, inputs: list[str]) -> list[list[DecodedSolValue]]:
    """Parse log and return decoded event. Returns None if topic0 not found."""
    return await self.inner.decode_inputs(input)

def decode_inputs_sync(self, inputs: list[str]) -> list[list[DecodedSolValue]]:
    """Parse log and return decoded event. Returns None if topic0 not found."""
    return self.inner.decode_input_syncs(input)

Bugs in that snippet:

• used input (builtin) instead of inputs
• used decode_input_syncs instead of decode_inputs_sync

Solution :

async def decode_inputs(self, inputs: list[str]) -> list[list[DecodedSolValue]]:
       """Decode ABI-encoded calldata strings; forwards to the Rust CallDecoder."""
       return await self.inner.decode_inputs(inputs)

   def decode_inputs_sync(self, inputs: list[str]) -> list[list[DecodedSolValue]]:
       """Decode ABI-encoded calldata strings; forwards to the Rust CallDecoder."""
       return self.inner.decode_inputs_sync(inputs)

Here , what I fixed :

• async path forwards inputs to self.inner.decode_inputs(inputs)
• sync path forwards inputs to self.inner.decode_inputs_sync(inputs)

So the two earlier bugs are fixed there:

• no accidental use of builtin input
• no typo decode_input_syncs method name