LSP :: Error from the Language Server: KeyError: 28 (Invalid Parameters)

[JulienPalard]

I'm trying jedi-language-server for the first time, sorry I'm I don't give all relevant infos...

Using emacs 27.1 on Debian, with lsp-jedi 20200812.1826, and jedi-language-server version 0.28.3.

In a file containing:

import random

random.gauss

If I point to the dot I get:

LSP :: Error from the Language Server: KeyError: 28 (Invalid Parameters)

in the minibuffer.

If you need more information, don't hesitate to ask (telling me how to gather them). I tried good old strace on jedi-language-server looking for tracebacks or KeyError but found nothing.

[pappasam]

Thanks for opening this issue! Questions for you:

1. What LSP action are you trying to perform? Completion, Hover, Code Action, etc?
2. Would you be able to update your example file in the following way:

import random

random.|gauss

Where | represents your cursor location at the time you perform your LSP action?

[JulienPalard]

Thanks for opening this issue! Questions for you:

1. What LSP action are you trying to perform? Completion, Hover, Code Action, etc?

I don't know how to perform the hover action yet, so I can't say if it is it or not... I was doing nothing, just waiting.

2. Would you be able to update your example file in the following way:

Yes and no, my emacs point is not a thin cursor, it's ... an emacs point: it spans over the whole dot between random and gauss but for me it means:

import random

random|.gauss

Ohhh I tried another way, instead of stracing jedi-language-server, I straced emacs, to ensure I'll get all spawned subprocesses, just in case, and BOOM I have it:

334266 <... read resumed>"Content-Length: 1314\r\nContent-Type: application/vscode-jsonrpc; charset=utf-8\r\n\r\n{\"jsonrpc\": \"2.0\", \"id\": \"14\", \"error\": {\"code\": -32602, \"message\": \"KeyError: 28\", \"data\": \"{'traceback': ['  File \\\"/home/mdk/.local/lib/python3.9/site-packages/pygls/protocol.py\\\", line 343, in _handle_request\\\\n    self._execute_request(msg_id, handler, params)\\\\n', '  File \\\"/home/mdk/.local/lib/python3.9/site-packages/pygls/protocol.py\\\", line 272, in _execute_request\\\\n    method_name, method_type, msg_id, handler(params))\\\\n', '  File \\\"/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/server.py\\\", line 509, in code_action\\\\n    extract_function_changes = text_edit_utils.lsp_document_changes(\\\\n', '  File \\\"/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/text_edit_utils.py\\\", line 33, in lsp_document_changes\\\\n    return [\\\\n', '  File \\\"/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/text_edit_utils.py\\\", line 64, in lsp_text_document_edits\\\\n  "..., 4096) = 1395 
334269 write(2, "Executing <Task pending name='Task-1' coro=<aio_readline() running at /home/mdk/.local/lib/python3.9/site-packages/pygls/server.py:50> wait_for=<Future pending cb=[_chain_future.<locals>._call_check_cancel() at /usr/lib/python3.9/asyncio/futures.py:384, <TaskWakeupMethWrapper object at 0x7fd8ff3881d0>()] created at /usr/lib/python3.9/asyncio/base_events.py:424> cb=[_run_until_complete_cb() at /usr/lib/python3.9/asyncio/base_events.py:184] created at /usr/lib/python3.9/asyncio/base_events.py:621> took 0.881 seconds\n", 520) = 520                                                                                  
334269 epoll_wait(3, [{EPOLLIN, {u32=4, u64=4}}], 1, 0) = 1                                                                                                    
334269 stat("/usr/lib/python3.9/asyncio/base_events.py", {st_mode=S_IFREG|0644, st_size=73809, ...}) = 0                                                       
334266 write(4, "\33[47;1H\33[?25l\33[1m\33[38;5;180m\33[48;5;237mLSP\33[m\33[39;49m\33[38;5;188m\33[48;5;237m :: Error from the Language Server: KeyError: 28 (Invalid Parameters) \33[39;49m\33[4;7H\33[?12l\33[?25h\33[?12;25h", 180 <unfinished ...>      

Here it is as a Python traceback:

Traceback (most recent call last):
  File "/home/mdk/.local/lib/python3.9/site-packages/pygls/protocol.py", line 343, in _handle_request
    self._execute_request(msg_id, handler, params)
  File "/home/mdk/.local/lib/python3.9/site-packages/pygls/protocol.py", line 272, in _execute_request
    method_name, method_type, msg_id, handler(params))
  File "/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/server.py", line 509, in code_action
    extract_function_changes = text_edit_utils.lsp_document_changes(
  File "/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/text_edit_utils.py", line 33, in lsp_document_changes
    return [
  File "/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/text_edit_utils.py", line 64, in lsp_text_document_edits
    text_edits = lsp_text_edits(changed_file)
  File "/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/text_edit_utils.py", line 90, in lsp_text_edits
    start = opcode_position_lookup_old[opcode.old_start]
  File "/home/mdk/.local/lib/python3.9/site-packages/jedi_language_server/text_edit_utils.py", line 152, in __getitem__
    raise KeyError(item)
KeyError: 28

From text_edit_utils.py:90, when the exception occurs, the opcode_position_lookup_old contains:

{range(0, 14): LinePosition(range_start=0, range_end=14, line=0, code='import random\n'), range(14, 15): LinePosition(range_start=14, range_end=15, line=1, code='\n'), range(15, 28): LinePosition(range_start=15, range_end=28, line=2, code='random.gauss\n')}

[pappasam]

@JulienPalard amazing info, thanks so much for digging into this and clearly laying out the problem! Please try out #99 and let me know if it resolves your issue. I've added a test case for your specific example and it now passes.

[pappasam]

If you're looking for tips on testing this out locally: #95 (comment)

[pappasam]

Based on my tests, I believe this has been closed in the latest release. @JulienPalard Please confirm, and then I'll close

[JulienPalard]

Yes, it works for me, thanks!