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Carlo Bertolino suggested an idea (#705) · Sep 08, 2016 at 07:46 AM · driver authoring

Ability to write a python topology driver instead of scripts or authoring

My suggestion is to provide a way to build a python topology driver. At the moment a topology driver is built via authoring. This is easy to handle but it is an exception respect to resource driver or services that can by write in pure python. I know it exist also scripts but a script implements just one command. If I need to share libraries or piece of code between different scripts this is not allowed based on my understanding. Thx

Pascal Joly commented · Oct 26, 2016 at 11:40 PM

Hi Carlo, We don't have a plan right now to provide python topology drivers . could you explain a bit more what you are trying to do with the orchestration that you can't do with a python script? thanks, Pascal

Yaniv Kalsky commented · Feb 11, 2017 at 03:53 PM

Hi @carlo.bertolino ,

A script (resource or environment) can also be a zip file with one main file and multiple dependencies.

So one way is to have all your commands taking the same dependencies into their zip file - you can take a look at the Default Sandbox Setup/Teardown scripts, they are built in that way, and take a look at the cloudshell-orch-sandbox repository on github to see how it's done (using a qpm utility and some ini files in the spec folder).

Another way, if you have some packages that are required for the script, and they're available on pypi, is to try and use them, and if it fails - install them - from the script like this:

try:    
    import tftpy
except:    
    import pip    
    pip.main(['install','tftpy'])    
    import tftpy

It's not the most recommended way (in the python community), sometimes it's best to just report an error when you can't find the package, and the admin will then install the packages on the execution servers.

Yaniv

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Ability to write a python topology driver instead of scripts or authoring

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