Re: [tosca-parser] Failing to get functions from capabilities

17 Dec 2018

      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 
<mailto: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
    <http://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 <http://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