fix: add source context to parsing error messages

[Harshit28j]

Summary

Fixes #3518

When parse_vulnerabilities_from_data() fails to parse a vulnerability record, the error message now includes the filename that caused the issue.

Changes

Added an optional source_name parameter to parse_vulnerabilities_from_data() in osv/sources.py. When parsing fails and source_name is provided, the exception is wrapped with a RuntimeError that includes the filename.

Files Modified

File	Change
osv/sources.py	Added source_name parameter to wrap parsing errors with file context
gcp/workers/importer/importer.py	Pass source_name=blob.name at 3 call sites
gcp/workers/worker/worker.py	Pass source_name=path at 1 call site

Before vs After

Before:

Expecting value: line 1 column 1 (char 0)
Traceback (most recent call last):
  File "/usr/local/bin/importer.py", line 291, in run
    self.process_updates(source_repo)
  File "/usr/local/bin/importer.py", line 986, in process_updates
    self._process_updates_rest(source_repo)
  File "/usr/local/bin/importer.py", line 907, in _process_updates_rest
    vulns = osv.parse_vulnerabilities_from_data(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/env/osv/sources.py", line 146, in parse_vulnerabilities_from_data
    data = json.loads(data_text)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/json/decoder.py", line 338, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/json/decoder.py", line 356, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

After:

[another-rex]

/gcbrun

[another-rex]

Thanks!