Re: Re: custom promises: use data from python list in mustache template

"'Vratislav Podzimek' via help-cfengine" <[email protected]> Wed, 23 Nov 2022 17:07:25 +0100
Newsgroups	gmane.comp.sysutils.cfengine.general
Message-ID	<[email protected]>
Hi Chris! 
Yes, that's expected. The custom promise types are just like the other, built in, promise types --
they implement support for promises, i.e. state definitions, and the communication protocol only
passes the definitions to the custom module and then promise results and log messages back. What
your use case requires would be custom policy functions support of which is part of our plans [1],
but currently not with high priority.

[1] https://tracker.mender.io/browse/CFE-2839

--
Vratislav

On Wed, 2022-11-23 at 05:38 -0800, Xander Cage wrote:
> toyed around a bit...returning just json seems not to work very well
> 
> import os
> import json
> from cfengine import PromiseModule, ValidationError, Result
> 
> 
> class MkSudoPermsModule(PromiseModule):
>     def __init__(self):
>         super().__init__("itsv_mk_sudo_perms_promise_module", "0.0.1")
> 
>     def validate_promise(self, promiser, attributes):
>         pass
> 
>     def evaluate_promise(self, promiser, attributes):
>         lst = ['jboss1', 'jboss2', 'jboss3']
>         return json.dumps(lst)
> 
>         return Result.KEPT
> 
> 
> if __name__ == "__main__":
>     MkSudoPermsModule().start()
> ~
> 
> result:
> 
> verbose:  Begin policy/promise evaluation
>  verbose: ----------------------------------------------------------------
>  verbose: Using bundlesequence =>  {"main"}
>  verbose: B: *****************************************************************
>  verbose: B: BEGIN bundle main
>  verbose: B: *****************************************************************
>    debug: DeRefCopyPromise(): promiser:'/usr/security/user'
>    debug: DeRefCopyPromise():     copying constraint: 'name'
>  verbose: Starting custom promise module '/var/cfengine/modules/promises/itsv_mk_sudo_perms.py'
> with command '/opt/freeware/bin/python3 /var/cfengine/modules/promises/itsv_mk_sudo_perms.py'
>    debug: Received header from promise module: 'itsv_mk_sudo_perms_promise_module 0.0.1 v1
> json_based'
>    debug: Received line from module: '{"operation": "validate_promise", "promiser":
> "/usr/security/user", "attributes": {"name": "jboss"}, "result": "valid"}'
>    debug: Received line from module: '{"operation": "evaluate_promise", "promiser":
> "/usr/security/user", "attributes": {"name": "jboss"}, "result": "[\"jboss1\", \"jboss2\",
> \"jboss3\"]"}'
>    error: Promise module returned unacceptable result: '["jboss1", "jboss2", "jboss3"]'
> (mk_sudo_perms promise, promiser: '/usr/security/user' module:
> '/var/cfengine/modules/promises/itsv_mk_sudo_perms.py')
>  verbose: A: Promise NOT KEPT!
>  verbose: P: END mk_sudo_perms promise (/usr/security/user)
>    debug: DeRefCopyPromise(): promiser:'/usr/security/user'
>    debug: DeRefCopyPromise():     copying constraint: 'name'
>    debug: DeRefCopyPromise(): promiser:'/usr/security/user'
>    debug: DeRefCopyPromise():     copying constraint: 'name'
>  verbose: A: ...................................................
>  verbose: A: Bundle Accounting Summary for 'main' in namespace default
> 
> 
> not very promising *gg*
> 
> 
> On Wednesday, November 23, 2022 at 1:08:22 PM UTC+1 Xander Cage wrote:
> > Hi,
> > 
> > i need to create a "custom promise" which read some string base data from system files. i want
> > to use this data inside a cfengine mustache template to write out to another file.
> > i skimmed through the "custom" api docs but could not find a hint how to transpose data from the
> > underlying module code (python list) in an cfengine variable. or is it as easy as just 
> > returning the list as a json string?
> >  is this even possible?
> > 
> > wbr
> > 
> > chris
> > 
> > 
> > 
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