[BUG] ModuleNotFoundError: No module named 'buf' when importing protovalidate

[jkruzek]

Description

After pip installing protovalidate==0.3.1 and trying to import it I get the error ModuleNotFoundError: No module named 'buf'. This was using Python 3.11

Steps to Reproduce

1. pip install protovalidate
2. In Python REPL for 3.11 run import protovalidate
3. The error will show up on that command

Expected Behavior

Be able to import with out error. The reference to buf is internal to protovalidate but it doesn't seem to be in the package

Actual Behavior

Import errors out with ModuleNotFoundError: No module named 'buf'

Screenshots/Logs

>>> import protovalidate
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/venv/lib/python3.11/site-packages/protovalidate/__init__.py", line 15, in <module>
    from protovalidate import validator
  File "/venv/lib/python3.11/site-packages/protovalidate/validator.py", line 19, in <module>
    from buf.validate import expression_pb2  # type: ignore
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'buf'

Environment

• Operating System: macOS M2 chip
• Version: Sonoma 14.3.1
• Compiler/Toolchain:
• Protobuf Compiler & Version:
• Protoc-gen-validate Version: 0.4.2
• Protovalidate Version: 0.3.1

Possible Solution

Additional Context