"Server initialization failed" with Poetry environment

[ivan-gj]

Using mypy v1.4.1 under a poetry environment (properly setup in VSCode project) and I get the following crash report right after VS Code is launched:

2023-07-31 13:07:26.631 [info] Interpreter from setting mypy-type-checker.interpreter: /home/user/.cache/pypoetry/virtualenvs/tariff-tools-sOhTbMWF-py3.7/bin/python
2023-07-31 13:07:26.631 [info] Using legacy Mypy args from 'python.linting.mypyArgs': --follow-imports=silent --ignore-missing-imports --show-column-numbers --no-pretty.
2023-07-31 13:07:26.631 [info] Server: Stop requested
2023-07-31 13:07:26.631 [error] Server: Stop failed: Error: Client is not running and can't be stopped. It's current state is: startFailed
2023-07-31 13:07:26.631 [info] Interpreter from setting mypy-type-checker.interpreter: /home/user/.cache/pypoetry/virtualenvs/tariff-tools-sOhTbMWF-py3.7/bin/python
2023-07-31 13:07:26.632 [info] Using legacy Mypy args from 'python.linting.mypyArgs': --follow-imports=silent --ignore-missing-imports --show-column-numbers --no-pretty.
2023-07-31 13:07:26.635 [info] Server run command: /home/user/.cache/pypoetry/virtualenvs/tariff-tools-sOhTbMWF-py3.7/bin/python /home/user/.vscode/extensions/ms-python.mypy-type-checker-2023.1.12061012/bundled/tool/lsp_server.py
2023-07-31 13:07:26.636 [info] Server: Start requested.
2023-07-31 13:07:27.417 [info] Traceback (most recent call last):
  File "/home/user/.vscode/extensions/ms-python.mypy-type-checker-2023.1.12061012/bundled/tool/lsp_server.py", line 49, in <module>
    name="Mypy", version="v0.1.0", max_workers=MAX_WORKERS
TypeError: __init__() got an unexpected keyword argument 'name'

2023-07-31 13:07:27.533 [info] [Error - 13:07:27] Server initialization failed.
2023-07-31 13:07:27.533 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:27.533 [info] [Info  - 13:07:27] Connection to server got closed. Server will restart.
2023-07-31 13:07:27.533 [info] true
2023-07-31 13:07:27.533 [info] [Error - 13:07:27] Mypy Type Checker client: couldn't create connection to server.
2023-07-31 13:07:27.533 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:28.275 [info] Traceback (most recent call last):
  File "/home/user/.vscode/extensions/ms-python.mypy-type-checker-2023.1.12061012/bundled/tool/lsp_server.py", line 49, in <module>
    name="Mypy", version="v0.1.0", max_workers=MAX_WORKERS
TypeError: __init__() got an unexpected keyword argument 'name'

2023-07-31 13:07:28.381 [info] [Error - 13:07:28] Server initialization failed.
2023-07-31 13:07:28.381 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:28.381 [info] [Info  - 13:07:28] Connection to server got closed. Server will restart.
2023-07-31 13:07:28.381 [info] true
2023-07-31 13:07:28.381 [info] [Error - 13:07:28] Mypy Type Checker client: couldn't create connection to server.
2023-07-31 13:07:28.381 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:28.382 [error] Server: Start failed: Error: Pending response rejected since connection got disposed
2023-07-31 13:07:29.149 [info] Traceback (most recent call last):
  File "/home/user/.vscode/extensions/ms-python.mypy-type-checker-2023.1.12061012/bundled/tool/lsp_server.py", line 49, in <module>
    name="Mypy", version="v0.1.0", max_workers=MAX_WORKERS
TypeError: __init__() got an unexpected keyword argument 'name'

2023-07-31 13:07:29.251 [info] [Error - 13:07:29] Server initialization failed.
2023-07-31 13:07:29.251 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:29.251 [info] [Info  - 13:07:29] Connection to server got closed. Server will restart.
2023-07-31 13:07:29.251 [info] true
2023-07-31 13:07:29.252 [info] [Error - 13:07:29] Mypy Type Checker client: couldn't create connection to server.
2023-07-31 13:07:29.252 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:29.252 [info] [Error - 13:07:29] Restarting server failed
2023-07-31 13:07:29.252 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:30.002 [info] Traceback (most recent call last):
  File "/home/user/.vscode/extensions/ms-python.mypy-type-checker-2023.1.12061012/bundled/tool/lsp_server.py", line 49, in <module>
    name="Mypy", version="v0.1.0", max_workers=MAX_WORKERS
TypeError: __init__() got an unexpected keyword argument 'name'

2023-07-31 13:07:30.094 [info] [Error - 13:07:30] Server initialization failed.
2023-07-31 13:07:30.094 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:30.094 [info] [Info  - 13:07:30] Connection to server got closed. Server will restart.
2023-07-31 13:07:30.094 [info] true
2023-07-31 13:07:30.095 [info] [Error - 13:07:30] Mypy Type Checker client: couldn't create connection to server.
2023-07-31 13:07:30.095 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:30.095 [info] [Error - 13:07:30] Restarting server failed
2023-07-31 13:07:30.095 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:30.835 [info] Traceback (most recent call last):
  File "/home/user/.vscode/extensions/ms-python.mypy-type-checker-2023.1.12061012/bundled/tool/lsp_server.py", line 49, in <module>
    name="Mypy", version="v0.1.0", max_workers=MAX_WORKERS
TypeError: __init__() got an unexpected keyword argument 'name'

2023-07-31 13:07:30.926 [info] [Error - 13:07:30] Server initialization failed.
2023-07-31 13:07:30.926 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:30.926 [info] [Error - 13:07:30] The Mypy Type Checker server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
2023-07-31 13:07:30.926 [info] [Error - 13:07:30] Mypy Type Checker client: couldn't create connection to server.
2023-07-31 13:07:30.927 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 
2023-07-31 13:07:30.927 [info] [Error - 13:07:30] Restarting server failed
2023-07-31 13:07:30.927 [info]   Message: Pending response rejected since connection got disposed
  Code: -32097 

[karthiknadig]

TypeError: init() got an unexpected keyword argument 'name'

That error usually means you have pygls installed in your environment that is a bit too old.

[ivan-gj]

A quick

pip show pygls

shows a

WARNING: Package(s) not found: pygls

Who is supposed to have a dependency on pygls?

[karthiknadig]

Please use <python> -m pip with <python> being the absolute path to the python in your virtual environment. See here for explanation: https://snarky.ca/why-you-should-use-python-m-pip/

As for the pygls, this extension ships with pygls version 1.0.2 which has the name keyword argument see here

vscode-mypy/requirements.txt

Line 67 in f909f0e

pygls==1.0.2 \

Reference from pygls 1.0.2 see here: https://github.com/openlawlibrary/pygls/blob/v1.0.2/pygls/server.py#L343-L351

The only way you can get this error is if you have pylgs 0.12.4 or older which did not have name keyword:
https://github.com/openlawlibrary/pygls/blob/v0.12.4/pygls/server.py#L328

You may have to verify if PYTHONPATH environment variable is set and pygls might have been pulled from some other source. It is a generic Language server implementation which is used by several packages. so it can be a transitive dependency of something in your environment.

If all of that comes back with no pygls, then could you try this in your terminal:

> python -c "import pygls;print(pygls.__version__)"
> export PYTHONPATH=/home/user/.vscode/extensions/ms-python.mypy-type-checker-2023.1.12061012/bundled/tool/libs
> python -c "import pygls;print(pygls.__version__)"

[ivan-gj]

Hey!
After installing and uninstalling a bunch of times, and following your commands, all I can say is that:

• still no trace of any pygls installation --> CORRECTION I have found pygls after adding the PYTHONPATH
• now the errors from above are gone, and the Mypy Type Checker logs seem to indicate no issue, but I get no error even for the most obvious asdf: int = "asdf" stuff.

[karthiknadig]

@ivan-gj You might be running into this issue with dmypy: python/mypy#15677

You can use mypy instead of dmypy if you set the mypy-type-checker.path to ["/home/user/.cache/pypoetry/virtualenvs/tariff-tools-sOhTbMWF-py3.7/bin/python", "-m", "mypy"] to switch to using mypy.

[ivan-gj]

Hi, sorry for the delay, I will keep the investigation going, although it will take a while until I can come back with more.