Can't use self-signed SSL cert/key with emmett (serve|develop)

[brunobord]

Hello there.

I'm giving a try to emmett and I had trouble using the SSL options with emmett.
It's a fresh install, as this pip freeze result shows:

click==8.1.7
emmett==2.6.1
emmett-core==1.0.3
emmett-pydal==17.3.1
granian==1.6.2
pendulum==3.0.0
python-dateutil==2.9.0.post0
python-rapidjson==1.20
PyYAML==6.0.2
renoir==1.8.0
severus==1.4.0
six==1.16.0
time-machine==2.16.0
tzdata==2024.2
uvloop==0.21.0

app.py file:

from emmett import App, abort

app = App(__name__)

@app.route("/")
async def hello():
    return "Hello"

When I launch this app using emmett serve or emmett develop, there's no issue, the root route returns "Hello".

But then I've generated a SSL cert+key using the command listed in the docs:

openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 365 -nodes

Now I've got my key.pem and cert.pem files.

But the next commands fail:

emmett develop --ssl-certfile cert.pem --ssl-keyfile key.pem 
> Starting Emmett development server on app app
> Emmett application app running on http://127.0.0.1:8000 (press CTRL+C to quit)
> Restarting (stat mode)
Process Process-1:
Traceback (most recent call last):
  File "/usr/lib/python3.12/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/usr/lib/python3.12/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/emmett_core/server.py", line 28, in run
    server = granian.Granian(
             ^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/granian/server.py", line 153, in __init__
    self.build_ssl_context(ssl_cert, ssl_key, ssl_key_password)
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/granian/server.py", line 175, in build_ssl_context
    self.ssl_ctx = (True, str(cert.resolve()), str(key.resolve()), password)
                              ^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'resolve'

almost the same error when using the serve command:

emmett serve --ssl-certfile cert.pem --ssl-keyfile key.pem 
Traceback (most recent call last):
  File "/home/bbord/Projects/Various/Emmett/venv/bin/emmett", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/emmett/cli.py", line 473, in main
    cli.main(prog_name="python -m emmett" if as_module else None)
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/emmett/cli.py", line 225, in main
    return super().main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/click/decorators.py", line 92, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/emmett/cli.py", line 322, in serve_command
    sgi_run(
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/emmett_core/server.py", line 28, in run
    server = granian.Granian(
             ^^^^^^^^^^^^^^^^
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/granian/server.py", line 153, in __init__
    self.build_ssl_context(ssl_cert, ssl_key, ssl_key_password)
  File "/home/bbord/Projects/Various/Emmett/venv/lib/python3.12/site-packages/granian/server.py", line 175, in build_ssl_context
    self.ssl_ctx = (True, str(cert.resolve()), str(key.resolve()), password)
                              ^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'resolve'

I first thought it was an error with granian, but surprisingly, the following command worked as expected:

granian --ssl-keyfile key.pem --ssl-certificate cert.pem app.py

Is there a bug in emmett? Is there something else to do on my side to enable ssl in dev/serve mode?

[gi0baro]

@brunobord thank you for reporting this, it's definitely an Emmett bug. Will fix it asap.

[brunobord]

Fantastic! I've tested on my machine and it worked! Thank you for the fast fix!