debugpy: "python" key is required in "launch" request

[puremourning]

Environment data

• PTVSD version:

(debugpy) BenMBP:vimspector ben$ python -m debugpy --version
1.0.0b1

• OS and version: macOS Catalina
• Python version (& distribution if applicable, e.g. Anaconda):

(debugpy) BenMBP:vimspector ben$ python --version
Python 3.7.6

• Using VS Code or Visual Studio: vimspector

Actual behavior

When launching the debugee, the following exception is raised, when the launch configuration does not specify "python" key;

E+00000.028: /handling microsoft/ptvsd#1 request "launch" from Adapter/
             Traceback (most recent call last):
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 413, in __call__
                 value = validate(value)
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/json.py", line 222, in validate
                 raise ValueError(size_err)
             ValueError: must have at least 1 elements
             
             During handling of the above exception, another exception occurred:
             
             Traceback (most recent call last):
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 1060, in __init__
                 raise self
             debugpy.common.messaging.InvalidMessageError: Invalid message: "python" must hav
e at least 1 elements
             
             Stack where logged:
               File "/usr/local/Cellar/python/3.7.6/Frameworks/Python.framework/Versions/3.7/
lib/python3.7/threading.py", line 890, in _bootstrap
                 self._bootstrap_inner()
               File "/usr/local/Cellar/python/3.7.6/Frameworks/Python.framework/Versions/3.7/
lib/python3.7/threading.py", line 926, in _bootstrap_inner
                 self.run()
               File "/usr/local/Cellar/python/3.7.6/Frameworks/Python.framework/Versions/3.7/
lib/python3.7/threading.py", line 870, in run
                 self._target(*self._args, **self._kwargs)
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 1502, in _run_handlers
                 handler()
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 745, in _handle
                 result = handler(self)
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/launcher/handlers.py", line 58, in launch_request
                 python = request(python_key, json.array(unicode, vectorize=True, size=(1,)))
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 503, in __call__
                 return self.payload(*args, **kwargs)
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 419, in __call__
                 raise message.isnt_valid("{0!j}{1}", key, err)
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 553, in isnt_valid
                 return self.error(InvalidMessageError, *args, **kwargs)
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 544, in error
                 exc = exc_type(reason, self, silent)  # will log it
               File "/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/l
auncher/../../debugpy/common/messaging.py", line 1062, in __init__
                 log.exception()
             

E+00000.040: /handling microsoft/ptvsd#1 request "launch" from Adapter/
             Handler 'launch_request' (file '/Users/ben/.pyenv/versions/debugpy/lib/python3.7
/site-packages/debugpy/launcher/../../debugpy/launcher/handlers.py', line 17)
             couldn't handle microsoft/ptvsd#1 request "launch" from Adapter:
             Invalid message: "python" must have at least 1 elements

Here's the protocol log (vimspector <-> debugpy.adapter):

2020-01-31 23:04:22,378 - INFO - Starting debug adapter with: {"command": ["python", "-m", "debugpy.adapter"], "name": "debugpy"}
2020-01-31 23:04:22,384 - INFO - Debug Adapter Started
2020-01-31 23:04:22,385 - DEBUG - Sending Message: {"command": "initialize", "arguments": {"adapterID": "debugpy", "clientID": "vimspector", "clientName": "vimspector", "linesStartAt1": true, "columnsStartAt1": true, "locale": "en_GB", "pathFormat": "path", "supportsVariableType": true, "supportsVariablePaging": false, "supportsRunInTerminalRequest": true}, "seq": 0, "type": "request"}
2020-01-31 23:04:22,522 - DEBUG - Message received: {'seq': 1, 'type': 'event', 'event': 'output', 'body': {'category': 'telemetry', 'output': 'ptvsd', 'data': {'packageVersion': '1.0.0b1'}}}
2020-01-31 23:04:22,525 - DEBUG - Message received: {'seq': 2, 'type': 'event', 'event': 'output', 'body': {'category': 'telemetry', 'output': 'debugpy', 'data': {'packageVersion': '1.0.0b1'}}}
2020-01-31 23:04:22,527 - DEBUG - Message received: {'seq': 3, 'type': 'response', 'request_seq': 0, 'success': True, 'command': 'initialize', 'body': {'supportsCompletionsRequest': True, 'supportsConditionalBreakpoints': True, 'supportsConfigurationDoneRequest': True, 'supportsDebuggerProperties': True, 'supportsDelayedStackTraceLoading': True, 'supportsEvaluateForHovers': True, 'supportsExceptionInfoRequest': True, 'supportsExceptionOptions': True, 'supportsHitConditionalBreakpoints': True, 'supportsLogPoints': True, 'supportsModulesRequest': True, 'supportsSetExpression': True, 'supportsSetVariable': True, 'supportsValueFormattingOptions': True, 'supportsTerminateDebuggee': True, 'supportsGotoTargetsRequest': True, 'exceptionBreakpointFilters': [{'filter': 'raised', 'label': 'Raised Exceptions', 'default': False}, {'filter': 'uncaught', 'label': 'Uncaught Exceptions', 'default': True}]}}
2020-01-31 23:04:22,527 - DEBUG - Sending Message: {"command": "launch", "arguments": {"request": "launch", "type": "python", "cwd": "/Users/ben/.vim/bundle/vimspector/support/test/python/simple_python", "program": "/Users/ben/.vim/bundle/vimspector/support/test/python/simple_python/main.py", "stopOnEntry": true, "console": "integratedTerminal", "name": "test"}, "seq": 1, "type": "request"}
2020-01-31 23:04:22,528 - DEBUG - Message received: {'seq': 4, 'type': 'request', 'command': 'runInTerminal', 'arguments': {'kind': 'integrated', 'title': 'Python Debug Console', 'args': ['/Users/ben/.pyenv/versions/debugpy/bin/python', '/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/launcher', '/Users/ben/.vim/bundle/vimspector/support/test/python/simple_python/main.py'], 'env': {'DEBUGPY_LAUNCHER_PORT': '55951'}}}
2020-01-31 23:04:22,534 - DEBUG - Sending Message: {"seq": 2, "type": "response", "request_seq": 4, "command": "runInTerminal", "body": {"processId": 44305}, "success": true}
2020-01-31 23:04:22,534 - DEBUG - Calling: vimspector#internal#job#Send(g:vimspector_internal_arg_0)
2020-01-31 23:04:22,618 - INFO - Server stderr: E+00000.124: /handling microsoft/ptvsd#1 request "launch" from IDE[1]/
             Handler 'IDE._start_message_handler.<locals>.handle' (file '/Users/ben/.pyenv/versions/debugpy/lib/python3.7/site-packages/debugpy/adapter/components.py', line 170)
             couldn't handle microsoft/ptvsd#1 request "launch" from IDE[1]:
             Invalid message: "python" must have at least 1 elements


2020-01-31 23:04:22,626 - DEBUG - Message received: {'seq': 5, 'type': 'response', 'request_seq': 1, 'success': False, 'command': 'launch', 'message': 'Invalid message: "python" must have at least 1 elements'}

Expected behavior

Debugee starts, adapter connects. Launcher uses the sys.executable used to start the debug debugpy.adapter (per comment: microsoft/ptvsd#2068 (comment))

Steps to reproduce:

1. Send a launch request, but don't specify "python" in the request configuration

[puremourning]

wow, thanks for the quick fix :)