Why does any non-initialize operation always fail for me?

[winstonpurnomo]

Hi all, trying to use python-language-server LSP implementation for something. I am programatically sending JSONRPC messages from Python to pyls using the options pyls --tcp --host localhost --port 8080, and here are the messages am I sending:

{"jsonrpc": "2.0", "id": 1, "method": "initialize", "params": {"processId": None, "rootUri": "file:///Users/username/Folder", "capabilities": {"workspace": {"applyEdit": false, "workspaceEdit": {"documentChanges": false}}}}}

It responds with

{"jsonrpc":"2.0","id":1,"result":{"capabilities":{"codeActionProvider":true,"codeLensProvider":{"resolveProvider":false},"completionProvider":{"resolveProvider":false,"triggerCharacters":["."]},"documentFormattingProvider":true,"documentHighlightProvider":true,"documentRangeFormattingProvider":true,"documentSymbolProvider":true,"definitionProvider":true,"executeCommandProvider":{"commands":[]},"hoverProvider":true,"referencesProvider":true,"renameProvider":true,"foldingRangeProvider":true,"signatureHelpProvider":{"triggerCharacters":["(",",","="]},"textDocumentSync":{"change":2,"save":{"includeText":true},"openClose":true},"workspace":{"workspaceFolders":{"supported":true,"changeNotifications":true}},"experimental":{}}}}

Then I try to get document symbols with this:

{"jsonrpc": "2.0", "method": "textDocument/documentSymbol", "params": {"textDocument": {"uri": "file:///Users/username/Folder/main.py"}}, "id": 2}

This always gives back an error with this traceback:

2023-09-28 23:19:26,315 UTC - ERROR - pyls_jsonrpc.endpoint - Failed to handle request 3
Traceback (most recent call last):
  File "/Users/username/.pyenv/versions/3.10.13/envs/assembly/lib/python3.10/site-packages/pyls_jsonrpc/endpoint.py", line 113, in consume
    self._handle_request(message['id'], message['method'], message.get('params'))
  File "/Users/username/.pyenv/versions/3.10.13/envs/assembly/lib/python3.10/site-packages/pyls_jsonrpc/endpoint.py", line 182, in _handle_request
    handler_result = handler(params)
  File "/Users/username/.pyenv/versions/3.10.13/envs/assembly/lib/python3.10/site-packages/pyls_jsonrpc/dispatchers.py", line 23, in handler
    return method(**(params or {}))
  File "/Users/username/.pyenv/versions/3.10.13/envs/assembly/lib/python3.10/site-packages/pyls/python_ls.py", line 322, in m_text_document__completion
    return self.completions(textDocument['uri'], position)
  File "/Users/username/.pyenv/versions/3.10.13/envs/assembly/lib/python3.10/site-packages/pyls/python_ls.py", line 240, in completions
    completions = self._hook('pyls_completions', doc_uri, position=position)
  File "/Users/username/.pyenv/versions/3.10.13/envs/assembly/lib/python3.10/site-packages/pyls/python_ls.py", line 154, in _hook
    doc = workspace.get_document(doc_uri) if doc_uri else None
AttributeError: 'NoneType' object has no attribute 'get_document'

Ideas why this is happening?

[ccordoba12]

Are you sending a didOpen request first to register the file you're trying to get symbols for?

[winstonpurnomo]

Thanks for your response. I have tried to send this following message, and it fails with a different error?

>>>
Content-Length: 238

{"jsonrpc": "2.0", "method": "initialize", "params": {"processId": null, "rootUri": "file:///Users/username/Folder", "capabilities": {"workspace": {"applyEdit": true, "workspaceEdit": {"documentChanges": true}}}}, "id": 1}


<<<
Content-Length: 730
Content-Type: application/vscode-jsonrpc; charset=utf8

{"jsonrpc":"2.0","id":1,"result":{"capabilities":{"codeActionProvider":true,"codeLensProvider":{"resolveProvider":false},"completionProvider":{"resolveProvider":false,"triggerCharacters":["."]},"documentFormattingProvider":true,"documentHighlightProvider":true,"documentRangeFormattingProvider":true,"documentSymbolProvider":true,"definitionProvider":true,"executeCommandProvider":{"commands":[]},"hoverProvider":true,"referencesProvider":true,"renameProvider":true,"foldingRangeProvider":true,"signatureHelpProvider":{"triggerCharacters":["(",",","="]},"textDocumentSync":{"change":2,"save":{"includeText":true},"openClose":true},"workspace":{"workspaceFolders":{"supported":true,"changeNotifications":true}},"experimental":{}}}}


>>>
Content-Length: 230

{"jsonrpc": "2.0", "method": "textDocument/didOpen", "params": {"textDocument": {"uri": "file:///Users/username/Folder/main.py", "languageId": "py", "version": 1, "text": "def main():\n\treturn x"}}, "id": 2}


<<<
Content-Length: 1060
Content-Type: application/vscode-jsonrpc; charset=utf8

{"jsonrpc":"2.0","id":2,"error":{"code":-32602,"message":"AttributeError: 'NoneType' object has no attribute 'put_document'","data":{"traceback":["  File \"\/Users\/username\/.pyenv\/versions\/3.10.13\/envs\/env\/lib\/python3.10\/site-packages\/pyls_jsonrpc\/endpoint.py\", line 113, in consume\n    self._handle_request(message['id'], message['method'], message.get('params'))\n","  File \"\/Users\/username\/.pyenv\/versions\/3.10.13\/envs\/env\/lib\/python3.10\/site-packages\/pyls_jsonrpc\/endpoint.py\", line 182, in _handle_request\n    handler_result = handler(params)\n","  File \"\/Users\/username\/.pyenv\/versions\/3.10.13\/envs\/env\/lib\/python3.10\/site-packages\/pyls_jsonrpc\/dispatchers.py\", line 23, in handler\n    return method(**(params or {}))\n","  File \"\/Users\/username\/.pyenv\/versions\/3.10.13\/envs\/env\/lib\/python3.10\/site-packages\/pyls\/python_ls.py\", line 298, in m_text_document__did_ope

[ccordoba12]

Sorry, I forgot to mention that you also need to send a didChangeConfiguration request after you receive the initialize response from the server.

I'm sorry to say it but this shows that you don't understand how a client is supposed to communicate with the server. So, please take a close look to the LSP docs in order to do that.