'Node' object has no attribute 'find_host' in 0.7.0

[milesstoetzner]

Description

Hey,

I am having trouble accessing properties of a host using opera version 0.7.0.
The scenario works fine using opera version 0.6.9.
I think this is related to #257, however, producing the error AttributeError: 'Node' object has no attribute 'find_host'.

Greetings
Miles

Steps

Here is a minimal service template that should be deployed.
The some_property of node_software accesses the another_property of its host.

# service-template.yaml
tosca_definitions_version: tosca_simple_yaml_1_3

node_types: 
  node.software: 
    derived_from: tosca.nodes.SoftwareComponent
    properties: 
      some_property: 
        type: string
        default: { get_property: [SELF, host, another_property]}   # THIS IS THE PROBLEM

  node.compute:
    derived_from: tosca.nodes.Root
    properties: 
      another_property:
        type: string
    capabilities:
      host:
        type: tosca.capabilities.Compute


topology_template: 
  node_templates: 
    node_software: 
      type: node.software
      requirements: 
        - host: node_compute

    node_compute:
      type: node.compute
      properties: 
        another_property: some_value

Current Behaviour (Version 0.7.0)

When using opera version 0.7.0 the following happens.

opera validate service-template.yaml works:

Validating TOSCA CSAR or service template...
Done.

opera validate -e service-template.yaml throws the error:

Validating TOSCA CSAR or service template...
[Worker_0]   Deploying node_compute_0
[Worker_0]   Deployment of node_compute_0 complete
[Worker_0]   Deploying node_software_0
Traceback (most recent call last):
  File "/home/stoetzms/opera-0.7.0/.venv/bin/opera", line 8, in <module>
    sys.exit(main())
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/cli.py", line 61, in main
    return args.func(args)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/commands/deploy.py", line 130, in _parser_callback
    deploy_service_template(csar_or_st_path, inputs, storage,
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/commands/deploy.py", line 165, in deploy_service_template
    topology.deploy(verbose_mode, workdir, num_workers)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/topology.py", line 65, in deploy
    do_deploy = executor.wait_results()
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/threading/node_executor.py", line 33, in wait_results
    errors = self.process_results(results)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/threading/node_executor.py", line 57, in process_results
    future.result()
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 451, in result
    return self.__get_result()
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
    raise self._exception
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 124, in deploy
    self.run_operation(OperationHost.HOST, StandardInterfaceOperation.shorthand_name(),
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/base.py", line 86, in run_operation
    success, outputs, attributes = self.run(operation, host, verbose, workdir, validate)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/base.py", line 123, in run
    actual_host = self.get_host(operation.host or host)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 233, in get_host
    return self.find_host()
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 257, in find_host
    host = next((
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 258, in <genexpr>
    r.target.find_host()
AttributeError: 'Node' object has no attribute 'find_host'

opera deploy service-template.yaml throws the same error as previously:

[Worker_0]   Deploying node_compute_0
[Worker_0]   Deployment of node_compute_0 complete
[Worker_0]   Deploying node_software_0
Traceback (most recent call last):
  File "/home/stoetzms/opera-0.7.0/.venv/bin/opera", line 8, in <module>
    sys.exit(main())
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/cli.py", line 61, in main
    return args.func(args)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/commands/deploy.py", line 130, in _parser_callback
    deploy_service_template(csar_or_st_path, inputs, storage,
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/commands/deploy.py", line 165, in deploy_service_template
    topology.deploy(verbose_mode, workdir, num_workers)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/topology.py", line 65, in deploy
    do_deploy = executor.wait_results()
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/threading/node_executor.py", line 33, in wait_results
    errors = self.process_results(results)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/threading/node_executor.py", line 57, in process_results
    future.result()
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 451, in result
    return self.__get_result()
  File "/usr/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
    raise self._exception
  File "/usr/lib/python3.10/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 124, in deploy
    self.run_operation(OperationHost.HOST, StandardInterfaceOperation.shorthand_name(),
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/base.py", line 86, in run_operation
    success, outputs, attributes = self.run(operation, host, verbose, workdir, validate)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/base.py", line 123, in run
    actual_host = self.get_host(operation.host or host)
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 233, in get_host
    return self.find_host()
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 257, in find_host
    host = next((
  File "/home/stoetzms/opera-0.7.0/.venv/lib/python3.10/site-packages/opera/instance/node.py", line 258, in <genexpr>
    r.target.find_host()
AttributeError: 'Node' object has no attribute 'find_host'

Expected Behaviour (Version 0.6.9)

I would expect that this still works in 0.7.0.
When using opera 0.6.9 everything works as expected.

opera validate service-template.yaml works:

Validating TOSCA CSAR or service template...
Done.

opera validate -e service-template.yaml works:

Validating TOSCA CSAR or service template...
[Worker_0]   Validating node_software_0
[Worker_0]   Validation of node_software_0 complete
[Worker_0]   Validating node_compute_0
[Worker_0]   Validation of node_compute_0 complete
Done.

opera deploy service-template.yaml works:

[Worker_0]   Deploying node_software_0
[Worker_0]   Deployment of node_software_0 complete