Use environment variables to configure Zeebe

[kbakk]

Is your feature request related to a problem? Please describe.
The zeebe-client-node library has a "Zero-Conf constructor" that allows to use environment variables to set up Zeebe.

This project could benefit from taking the same approach.

It already supports specifying hostname:port with ZEEBE_ADDRESS.

Describe the solution you'd like
To quote from zeebe-client-node docs:

With no relevant environment variables set, it will default to localhost on the default port with no TLS.

The following environment variable configurations are possible with the Zero-conf constructor:

Camunda Cloud:

ZEEBE_ADDRESS
ZEEBE_AUTHORIZATION_SERVER_URL
ZEEBE_CLIENT_SECRET
ZEEBE_CLIENT_ID

Self-hosted or local broker (no TLS or OAuth):

ZEEBE_ADDRESS

Self-hosted or local broker with OAuth + TLS:

ZEEBE_CLIENT_ID
ZEEBE_CLIENT_SECRET
ZEEBE_TOKEN_AUDIENCE
ZEEBE_AUTHORIZATION_SERVER_URL
ZEEBE_ADDRESS

Basic Auth:

ZEEBE_BASIC_AUTH_PASSWORD
ZEEBE_BASIC_AUTH_USERNAME

Describe alternatives you've considered

• Having a function that's responsible for loading config and pass it to ZeebeWorker/ZeebeClient on instantiation.

E.g.

zeebe_client = ZeebeClient(**get_zeebe_config())
# where `get_zeebe_config` would return a dict
# e.g. {"secure_connection": True, "hostname": "localhost", "port": 26500}

---

If this is a direction we'd like to take, I'd be happy to submit a PR for this.

[JonatanMartens]

I definitely think this is something that we want in pyzeebe. It would be great if you could submit a PR.

[JonatanMartens]

Should I add this issue to the Pyzeebe 3.0.0 milestone @kbakk?

[kbakk]

@JonatanMartens I assume #186 was accidentally closed (because the branch it was made against was deleted)? Should I try to rebase this against master/development?

[JonatanMartens]

@kbakk, sorry for the late response.

It would be great if you could rebase this agains master :)