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@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@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