set_credential_file should search for auth endpoint

[calebgroom]

Setting region to 'LON' in ~/.pyrax.cfg will set pyrax.identity.auth_endpoint correctly. However, I believe this should be something that can be parsed from the file in pyrax.set_credential_file(). The auth endpoint seems like a natural fit with username and API key.

Is there a better way that doesn't require a user-wide setting like ~/.pyrax.cfg? The alternatives that I see don't feel as convenient as pyrax.set_credential_file().

[EdLeafe]

There is a way, but I have to agree that it's not obvious. I envisioned people being in one or the other auth regions, but not switching. I'll add the option to specify region when setting credentials. But in the meantime you can do:

import pyrax
pyrax.set_default_region("LON")
# This will reset the auth endpoint
pyrax.create_identity()
pyrax.set_credential_files("pth/to/creds")

[EdLeafe]

OK, I've pushed this change to the working branch. You can now optionally specify the parameter region="LON" in set_credentials(), set_credential_file(), and keyring_auth(). Let me know how this works for you.