Manage sessions for Dundas.

Description

Dundas has a very complete REST API. You need a user to use it, and if you forget to log out, you will burn through your elastic hours very quickly.

In short, Dundas is very friendly and let you have more users that paid for logged in at the same time (elastic hours), but you should not abuse it (if you burn through them, you are blocked).

Always be sure to be logged out, even in case of exception or multiple path is a pain. This is the idea behind this module. You will not need to remember yourself to log out, it will be done for you, in all cases if you so wish.

Why this module is useful

It currently does 2 things for you.

If you use dundas.Session within a context manager, the context manager wil log you in and out automagically, no matter what happens. You can as well use the session object as a normal object as long as you do not forget to log in and out yourself.

Each and every call to the API needs to have the same sessionId parameter. This module creates shortcuts for you for get, post and delete, to make your life easier. You do not need to repeat the host, api path prefix or sessionId every single time.

Installation

Simply with pip:

python3 -m pip install pydundas

The module should be able to work with python2 as well, but it is untested and as python2 will be end of life'd in a few months anyway I did not look into it.

Examples

You can see all the examples as one python file.

You can use pydundas as a context manager or as a normal python object. The context manager makes it impossible for you to forget to log out.

All the examples below assume a url, user and pwd variables.

Happy flow with context manager

with Session(user=user, pwd=pwd, url=url) as d:
    print(d.get('Server').text)

Output (example):

[{"name":"winterfell","serverGroupId":1,"lastSeenTime":"2019-03-29T09:33:38.880327Z","__classType":"dundas.configuration.ServerInfo"}]

When the variable d comes out of scope, so outside the with statement, you will be automagically logged out.

Change loglevel

with Session(user=user, pwd=pwd, url=url, loglevel='debug') as d:
    print(d.get('Server').text)

You will have the same output as before, with extra statements:

Logging in.
Logged in.
[{"name":"marbus","serverGroupId":1,"lastSeenTime":"2019-03-29T09:33:38.880327Z","__classType":"dundas.configuration.ServerInfo"}]
Logging out.
Logged out.

Note that you can access yourself the logger to tune it to your heart's content.

# Logger object are persistent. Let's restore loglevel to warning.
Session.setLogLevel('warning')

# Actually work on the logger
logger = logging.getLogger('pydundas.dundas')

Exception within the context manager are properly handled

with Session(user=user, pwd=pwd, url=url) as d:
        d.get('you/know/nothing')

output:

404 Client Error: Not Found for url: https://winterfell.got/api/you/know/nothing?sessionId=fbeb7897-5981-412b-a981-7783f88894bd

You are still automagically logged out.

Wrong credentials

with Session(user=user, pwd='valar dohaeris', url=url) as d:
        d.get('Server')

will give you

{"logOnFailureReason":"UnrecognizedCredentials","message":"The provided user credentials were not recognized."}

Full control without context manager

You can do it, but do not forget to log in/out yourself.

d = Session(user=user, pwd=pwd, url=url)
d.login()
print(d.get('Server').text)
d.logout()

You will get, as for the first example,

[{"name":"winterfell","serverGroupId":1,"lastSeenTime":"2019-03-29T09:33:38.880327Z","__classType":"dundas.configuration.ServerInfo"}]

No context manager, object reuse

No context manager and you reuse a logged-out Dundas session object. Nothing prevents you to log in again.

# d comes from the previous example, for instance.
d.login()
print(d.get('Server').text)
d.logout()

with the same output as previously.

No context manager, forget to log in

d = Session(user=user, pwd=pwd, url=url)
# oops, no login!
print(d.get('Server').text)
d.logout()

You will get:

440 Client Error:  for url: https://reports.webpower.io/api/Server

The same would happen if you reuse an object after logging out.

No context manager, forget to log out

I'm not that mean and I won't burn through your elastic hours, but be careful and that's why context the manager is awesome.