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In my mind (and I might be wrong), the inconsistency is that for
properties, interfaces and outputs if the value parsed is a reference to
something else I get a function which will resolve the value if I ask it
nicely. However for capabilities, I instead get None unless I have passed
in parsed parameters. This is despite the functions code supporting
get_input.

The issue with parsed parameters is I now need to run the parser twice --
the first run to detect what the inputs are, and then the second to provide
values for those so that the substitution occurs. That seems like a
confusing user interface to me.

Michael


On Tue, Dec 18, 2018 at 9:35 AM Bob Haddleton <bobh at haddleton.net> wrote:

> I'm not sure where the inconsistency is?  Can you elaborate?
>
> You can get the inputs from the tosca.inputs attribute without passing any
> input parameters:
>
> tosca = ToscaTemplate(sys.argv[1])
>
> print([input.name for input in tosca.inputs])
>
> ['cpus', 'db_name', 'db_user', 'db_pwd', 'db_root_pwd', 'db_port']
>
>
> Bob
>
> On 12/17/18 1:22 PM, Michael Still wrote:
>
> Thanks for that.
>
> That approach seems fair enough, but inconsistent with how other things
> are represented as functions. How am I meant to know what the inputs to the
> CSAR are before the CSAR is parsed?
>
> Michael
>
>
>
> On Tue, Dec 18, 2018 at 1:28 AM Bob Haddleton <bobh at haddleton.net> wrote:
>
>> Hi Michael:
>>
>> tosca-parser expects that the input values will be defined already and
>> passed to the ToscaTemplate object in the parsed_params argument.
>>
>> If you change:
>>
>> tosca = ToscaTemplate(sys.argv[1])
>>
>> to:
>>
>> tosca = ToscaTemplate(sys.argv[1], parsed_params={'cpus': 4})
>>
>> the output becomes:
>>
>> Processing node template server
>>   disk_size: 10 GB
>>   num_cpus: 4
>>   mem_size: 4096 MB
>>   architecture: x86_64
>>   type: Linux
>>   distribution: Fedora
>>   version: 18.0
>>   min_instances: 1
>>   max_instances: 1
>>   secure: True
>>
>>
>> Hope this helps.
>>
>> Bob
>>
>>
>> On 12/17/18 3:25 AM, Michael Still wrote:
>>
>> Hi,
>>
>> I'm trying to use tosca-parser to parse CSAR files. Its working quite
>> well, until I hit a wall with capabilities today. Specifically I am testing
>> with the single instance wordpress example CSAR, which uses a get_input for
>> the num_cpus argument for host capabilities for the server.
>>
>> Based on how properties work, I would expect to get a function back for
>> anything which requires referencing another value, but in the case of
>> capabilities I either get the hardcoded value (strings, ints etc), or a
>> None for values which would be functions if we were talking about
>> prototypes.
>>
>> Here's a snippet of example code:
>>
>> #!/usr/bin/python
>>
>> import sys
>>
>> from jinja2 import Template
>> import toscaparser.functions
>> from toscaparser.tosca_template import ToscaTemplate
>>
>> tosca = ToscaTemplate(sys.argv[1])
>>
>> for nodetemplate in tosca.nodetemplates:
>>     print
>>     print('Processing node template %s'% nodetemplate.name)
>>
>>     capabilities = nodetemplate.get_capabilities_objects()
>>     for cap in capabilities:
>>         propobjs = cap.get_properties_objects()
>>         if not propobjs:
>>             continue
>>
>>         for po in propobjs:
>>             print('  %s: %s' %(po.name, po.value))
>>
>> Which returns this:
>>
>> $ python _capabilities.py csar_wordpress.zip
>> No handlers could be found for logger "tosca.model"
>>
>> Processing node template wordpress
>>   network_name: PRIVATE
>>   initiator: source
>>   protocol: tcp
>>   secure: False
>>
>> Processing node template webserver
>>   network_name: PRIVATE
>>   initiator: source
>>   protocol: tcp
>>   secure: False
>>   secure: True
>>
>> Processing node template mysql_dbms
>>
>> Processing node template mysql_database
>>
>> Processing node template server
>>   secure: True
>>   min_instances: 1
>>   max_instances: 1
>>   mem_size: 4096 MB
>>   num_cpus: None
>>   disk_size: 10 GB
>>   distribution: Fedora
>>   version: 18.0
>>   type: Linux
>>   architecture: x86_64
>>
>> I would expect num_cpus for the "server" node_template to be a GetInput()
>> function based on its definition in the CSAR, but instead I get None.
>>
>> Is there an example somewhere of how to correctly access functions for
>> capabilities?
>>
>> Thanks,
>> Michael
>>
>>
>>
>
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