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Why does any non-initialize operation always fail for me?#448

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winstonpurnomo asked this question inQ&A
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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 3Traceback (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 NoneAttributeError: 'NoneType' object has no attribute 'get_document'

Ideas why this is happening?

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Replies: 1 comment 2 replies

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

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2 replies
@winstonpurnomo
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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: 730Content-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: 1060Content-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
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Sorry, I forgot to mention that you also need to send adidChangeConfiguration request after you receive theinitialize 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.

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