Hello Oslo team:
The Mistral project has an expressions package [0] that is used to
evaluate inline expressions using a context. It has a pluggable
architecture that presently supports Jinja and YAQL expression
evaluation. It also allows custom functions[1] to provide Python
implementations of functionality that is then made available to the
expression evaluation engines.
This functionality was originally developed to support dynamic
processing within Mistral workflows, but is also very useful in other
applications that use templates which require runtime evaluation of
expressions.
I'd like to explore extracting this functionality from mistral to make
it more widely available with minimal dependencies.
The expressions dependencies are pretty limited:
Jinja2
oslo.utils
oslo.log
stevedore
yaql
and since 60% are already oslo-maintained packages, it seemed like a
logical place to start.
I'd appreciate feedback on the topic. There is no real OpenStack
dependency in the functionality, so maybe a standalone package on pypi
makes sense.
Thanks for your help,
Bob Haddleton
[0] https://github.com/openstack/mistral/tree/master/mistral/expressions
[1]
https://github.com/openstack/mistral/blob/master/mistral/utils/expression_utils.py#L63
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