ANTLR download fails due to SSLError

[emileferreira]

When executing grammarinator-process without the --antlr argument, grammarinator requests antlerinator to download the ANTLR jarfile to ~/.antlerinator/antlr-4.7.1-complete.jar. This fails on my machine with an SSLError and the following stacktrace.

Traceback (most recent call last):
  File "/usr/lib/python3.10/urllib/request.py", line 1348, in do_open
    h.request(req.get_method(), req.selector, req.data, headers,
  File "/usr/lib/python3.10/http/client.py", line 1282, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.10/http/client.py", line 1328, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.10/http/client.py", line 1277, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.10/http/client.py", line 1037, in _send_output
    self.send(msg)
  File "/usr/lib/python3.10/http/client.py", line 975, in send
    self.connect()
  File "/usr/lib/python3.10/http/client.py", line 1454, in connect
    self.sock = self._context.wrap_socket(self.sock,
  File "/usr/lib/python3.10/ssl.py", line 513, in wrap_socket
    return self.sslsocket_class._create(
  File "/usr/lib/python3.10/ssl.py", line 1062, in _create
    self._sslobj = self._context._wrap_socket(
ssl.SSLError: Cannot create a client socket with a PROTOCOL_TLS_SERVER context (_ssl.c:801)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<redacted>/.venv/bin/grammarinator-process", line 33, in <module>
    sys.exit(load_entry_point('grammarinator==19.3', 'console_scripts', 'grammarinator-process')())
  File "<redacted>/.venv/lib/python3.10/site-packages/grammarinator/process.py", line 708, in execute
    antlerinator.install(lazy=True)
  File "<redacted>/.venv/lib/python3.10/site-packages/antlerinator/install.py", line 47, in install
    with contextlib.closing(urlopen(tool_url, context=ssl_context)) as response:
  File "/usr/lib/python3.10/urllib/request.py", line 216, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.10/urllib/request.py", line 519, in open
    response = self._open(req, data)
  File "/usr/lib/python3.10/urllib/request.py", line 536, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
  File "/usr/lib/python3.10/urllib/request.py", line 496, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.10/urllib/request.py", line 1391, in https_open
    return self.do_open(http.client.HTTPSConnection, req,
  File "/usr/lib/python3.10/urllib/request.py", line 1351, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error Cannot create a client socket with a PROTOCOL_TLS_SERVER context (_ssl.c:801)>

I am able to circumvent this issue by downloading the required ANTLR jarfile and pointing to it using the --antlr argument.

Have the SSL certificates perhaps expired?
Is grammarinator not compatible with my version of Python?

[renatahodovan]

I guess that you are using the latest release which is quite old unfortunately... :( I'm working on a new release, but until it's available, you should try to install Grammarinator from source: checkout this repo, (create a virtualenv) and run pip install . from its root.

[emileferreira]

I am indeed using the latest release from PyPI. Thanks for the hint, and for your work in maintaining the project. You might want to add a note about this in the README until you've published the new release :)