VSCode Extension: Request textDocument/documentSymbol failed

The VS Code extension keeps popping up an error ~dialog/toast with the message `Request textDocument/documentSymbol failed`.

# Current behavior

* Using my large, proprietary codebase, edit some files, error dialog pops up on every keypress.
* If I dismiss it, it comes right back.
* Choosing the VS Code option to hide "Info & Warning" messages from the extension does not help, presumably because this is an error.

## Screenshots

## Library & System Information

python v3.11.10
macOS 15.3.1
VS Code 1.100.0 (and Cursor 0.50.4)
Hamilton VSCode extension v0.1.2
Python libraries installed in venv:

```
Package Version Editable project location
---------------------------- -------------- ------------------------------
aiofiles 24.1.0
aiohappyeyeballs 2.6.1
aiohttp 3.11.18
aiosignal 1.3.2
annotated-types 0.7.0
anyio 4.8.0
appnope 0.1.4
argon2-cffi 23.1.0
argon2-cffi-bindings 21.2.0
arrow 1.3.0
asgiref 3.8.1
asttokens 3.0.0
async-lru 2.0.4
attrs 25.3.0
babel 2.16.0
backoff 2.2.1
beautifulsoup4 4.12.3
bleach 6.2.0
blinker 1.9.0
cattrs 24.1.3
certifi 2024.12.14
cffi 1.17.1
cfgv 3.4.0
charset-normalizer 3.4.1
click 8.2.0
colorlog 6.9.0
comm 0.2.2
contourpy 1.3.1
cryptography 44.0.0
cycler 0.12.1
dash 2.17.0
dash-bootstrap-components 1.6.0
dash-core-components 2.0.0
dash-html-components 2.0.0
dash-table 5.0.0
testproj 0.1 /Users/gkistner/testproj
testproj-toolkit 0.11
debugpy 1.8.11
decorator 5.1.1
defusedxml 0.7.1
distlib 0.3.9
distro 1.9.0
django 5.2
django-extensions 4.1
django-ninja 1.4.1
duckdb 1.2.2
et-xmlfile 2.0.0
executing 2.1.0
fastjsonschema 2.21.1
filelock 3.18.0
flask 3.0.3
flexcache 0.3
flexparser 0.4
fonttools 4.55.3
fqdn 1.5.1
frozenlist 1.6.0
fsspec 2025.3.2
gitdb 4.0.12
gitpython 3.1.44
graphviz 0.20.3
h11 0.14.0
httpcore 1.0.7
httpx 0.28.1
identify 2.6.10
idna 3.10
importlib-metadata 8.5.0
iniconfig 2.0.0
ipykernel 6.29.5
ipython 8.31.0
ipywidgets 8.1.3
isoduration 20.11.0
itsdangerous 2.2.0
jedi 0.19.2
jinja2 3.1.5
json5 0.10.0
jsonpointer 3.0.0
jsonschema 4.23.0
jsonschema-specifications 2024.10.1
jupyter-client 8.6.3
jupyter-collaboration 2.1.0
jupyter-core 5.7.2
jupyter-events 0.11.0
jupyter-http-over-ws 0.0.8
jupyter-lsp 2.2.5
jupyter-server 2.15.0
jupyter-server-fileid 0.9.3
jupyter-server-terminals 0.5.3
jupyter-ydoc 2.0.1
jupyterlab 4.2.0
jupyterlab-pygments 0.3.0
jupyterlab-server 2.27.3
jupyterlab-widgets 3.0.13
kiwisolver 1.4.8
loguru 0.7.3
lsprotocol 2023.0.1
markdown-it-py 3.0.0
markupsafe 3.0.2
matplotlib 3.7.0
matplotlib-inline 0.1.7
mdurl 0.1.2
mistune 3.1.0
monotonic 1.6
msal 1.31.1
multidict 6.4.3
mypy-extensions 1.0.0
nbclient 0.10.2
nbconvert 7.16.5
nbformat 5.10.4
nest-asyncio 1.6.0
networkx 2.8.4
nodeenv 1.9.1
notebook 7.2.3
notebook-shim 0.2.4
ntlm-auth 1.5.0
numpy 1.23.5
office365-rest-python-client 2.5.10
openpyxl 3.0.10
overrides 7.7.0
packaging 24.2
pandas 1.5.3
pandocfilters 1.5.1
parso 0.8.4
passlib 1.7.4
pdoc 15.0.1
pexpect 4.9.0
pillow 11.1.0
pint 0.24.4
platformdirs 4.3.6
plotly 5.22.0
pluggy 1.5.0
posthog 3.25.0
pre-commit 4.2.0
prometheus-client 0.21.1
prompt-toolkit 3.0.48
propcache 0.3.1
psutil 6.1.1
psycopg 3.2.5
psycopg-binary 3.2.5
psycopg2-binary 2.9.10
ptyprocess 0.7.0
pure-eval 0.2.3
pyclean 3.1.0
pycparser 2.22
pycrdt 0.8.31
pycrdt-websocket 0.13.5
pydantic 2.11.4
pydantic-core 2.33.2
pydantic-yaml 1.4.0
pygls 1.3.1
pygments 2.19.1
pyjwt 2.10.1
pyparsing 3.2.1
pyproject-fmt 2.5.1
pytest 8.3.5
pytest-order 1.3.0
python-dateutil 2.9.0.post0
python-json-logger 3.2.1
pytz 2024.2
pyyaml 6.0.2
pyzmq 26.2.0
referencing 0.35.1
requests 2.32.3
requests-ntlm2 6.5.2
retrying 1.3.4
rfc3339-validator 0.1.4
rfc3986-validator 0.1.1
rich 14.0.0
rpds-py 0.22.3
ruamel-yaml 0.18.10
ruamel-yaml-clib 0.2.12
ruff 0.11.9
scipy 1.10.0
seaborn 0.12.2
send2trash 1.8.3
setuptools 75.8.0
sf-hamilton 1.88.0
sf-hamilton-lsp 0.1.0
sf-hamilton-sdk 0.8.0
sf-hamilton-ui 0.0.17
shellingham 1.5.4
six 1.17.0
smmap 5.0.2
snakeviz 2.2.2
sniffio 1.3.1
soupsieve 2.6
sqlglot 26.15.0
sqlite-anyio 0.2.3
sqlparse 0.5.3
stack-data 0.6.3
tabulate2 1.10.1
tenacity 9.0.0
terminado 0.18.1
tinycss2 1.4.0
toml-fmt-common 1.0.1
tornado 6.4.2
traitlets 5.14.3
typer 0.15.2
types-python-dateutil 2.9.0.20241206
typing-extensions 4.12.2
typing-inspect 0.9.0
typing-inspection 0.4.0
tzlocal 2.1
uncertainties 3.2.3
uri-template 1.3.0
urllib3 2.3.0
virtualenv 20.30.0
wcwidth 0.2.13
webcolors 24.11.1
webencodings 0.5.1
websocket-client 1.8.0
werkzeug 3.0.6
widgetsnbextension 4.0.13
yarl 1.20.0
zipp 3.21.0
```

# Expected behavior

Change logging level to warning or info, or more cleanly workaround this problem.

# Additional context

Here's the Output pane for the Hamilton Language Server, cleaned right before triggering this error:

```
2025-05-15 15:10:00.127 [info] Failed to hash source code for node pcie_result. Certain environments (such as databricks) do not allow it. In this case, version will be None.

2025-05-15 15:10:00.127 [info] Failed to hash source code for node config_name. Certain environments (such as databricks) do not allow it. In this case, version will be None.

2025-05-15 15:10:00.127 [info] Failed to hash source code for node cpu_name. Certain environments (such as databricks) do not allow it. In this case, version will be None.
Failed to hash source code for node foo. Certain environments (such as databricks) do not allow it. In this case, version will be None.
Failed to hash source code for node bar_name. Certain environments (such as databricks) do not allow it. In this case, version will be None.
Failed to hash source code for node gar. Certain environments (such as databricks) do not allow it. In this case, version will be None.
Failed to hash source code for node gar_per_row. Certain environments (such as databricks) do not allow it. In this case, version will be None.
Failed to hash source code for node foo_per_row. Certain environments (such as databricks) do not allow it. In this case, version will be None.
Failed to hash source code for node row_count. Certain environments (such as databricks) do not allow it. In this case, version will be None.

2025-05-15 15:10:00.180 [info] Failed to handle request 24 textDocument/documentSymbol DocumentSymbolParams(text_document=TextDocumentIdentifier(uri='file:///Users/gkistner/testproj/test.py'), work_done_token=None, partial_result_token=None)
Traceback (most recent call last):
File "/Users/gkistner/testproj/.venv/lib/python3.11/site-packages/pygls/protocol/json_rpc.py", line 266, in _handle_request
self._execute_request(msg_id, handler, params)
File "/Users/gkistner/testproj/.venv/lib/python3.11/site-packages/pygls/protocol/json_rpc.py", line 188, in _execute_request
self._send_response(msg_id, handler(params))
^^^^^^^^^^^^^^^
File "/Users/gkistner/testproj/.venv/lib/python3.11/site-packages/hamilton_lsp/server.py", line 191, in document_symbols
_, starting_line = inspect.getsourcelines(origin)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/Cellar/python@3.11/3.11.10/Frameworks/Python.framework/Versions/3.11/lib/python3.11/inspect.py", line 1240, in getsourcelines
lines, lnum = findsource(object)
^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/Cellar/python@3.11/3.11.10/Frameworks/Python.framework/Versions/3.11/lib/python3.11/inspect.py", line 1077, in findsource
raise OSError('could not get source code')
OSError: could not get source code

2025-05-15 15:10:00.181 [info] [Error - 3:10:00 PM] Request textDocument/documentSymbol failed.
2025-05-15 15:10:00.181 [info] Message: OSError: could not get source code
Code: -32603
[object Object]
2025-05-15 15:10:00.475 [info] Failed to handle request 25 textDocument/documentSymbol DocumentSymbolParams(text_document=TextDocumentIdentifier(uri='file:///Users/gkistner/testproj/test.py'), work_done_token=None, partial_result_token=None)
Traceback (most recent call last):
File "/Users/gkistner/testproj/.venv/lib/python3.11/site-packages/pygls/protocol/json_rpc.py", line 266, in _handle_request
self._execute_request(msg_id, handler, params)
File "/Users/gkistner/testproj/.venv/lib/python3.11/site-packages/pygls/protocol/json_rpc.py", line 188, in _execute_request
self._send_response(msg_id, handler(params))
^^^^^^^^^^^^^^^
File "/Users/gkistner/testproj/.venv/lib/python3.11/site-packages/hamilton_lsp/server.py", line 191, in document_symbols
_, starting_line = inspect.getsourcelines(origin)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/Cellar/python@3.11/3.11.10/Frameworks/Python.framework/Versions/3.11/lib/python3.11/inspect.py", line 1240, in getsourcelines
lines, lnum = findsource(object)
^^^^^^^^^^^^^^^^^^
File "/opt/homebrew/Cellar/python@3.11/3.11.10/Frameworks/Python.framework/Versions/3.11/lib/python3.11/inspect.py", line 1077, in findsource
raise OSError('could not get source code')
OSError: could not get source code

2025-05-15 15:10:00.476 [info] [Error - 3:10:00 PM] Request textDocument/documentSymbol failed.
2025-05-15 15:10:00.476 [info] Message: OSError: could not get source code
Code: -32603
[object Object]
```