Hey Guys,
I'm a big fan of using the extract filter to get hostvar values from a set
of hosts. What I have found is that I often times need to inject those vars
into strings such as URLs or the such. I created a filter to allow myself
to map over the list of vars and inject them into a string that I call
interpolate. Just sharing in case others find it also useful.
Here is an example use case.
telegraf_influxdb_urls: "{{
groups['tag_group_influxdb']|map('extract', hostvars,
'ansible_fqdn')|map('interpolate', 'http://{}:8086')|list|join(',') }}"
The filter is super similar to the existing jinja2 filter called format
just with the arguments flipped so that the template is applied to every
element being mapped over.
The source for this is just
def interpolate(elem, tmpl):
''' Inject elements into a python string '''
return tmpl.format(elem)
Anyways just thought I would share. If someone else knows a way to do this
without having to add a new filter let me know, otherwise I think it could
be a useful addition to the core ansible filters.
Tony
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