Resource module builder

Overview

The resource module builder is an Ansible Playbook that helps developers scaffold and maintain an Ansible network resource module.

Capabilities

• Use a defined model to scaffold a resource module directory layout and initial class files.
• Scaffold either an Ansible role or a collection.
• Subsequent uses of the Resource Module Builder (RMB) will only replace the module arspec and file containing the module doc string.
• Complex examples can be stored along side the model in the same directory.
• Maintain the model as the source of truth for the module and use RMB to update the source files as needed.
• Generates working sample modules for both <network_os>_<resource> and <network_os>_facts

Usage

pip install -r requirements.txt

ansible-playbook -e rm_dest=<destination for modules and module utils> \
                 -e structure=role \
                 -e model=<model> \
                 site.yml

or

ansible-playbook -e rm_dest=<destination for modules and module utils> \
                 -e structure=collection \
                 -e collection_org=<collection_org> \
                 -e collection_name=<collection_name> \
                 -e model=<model> \
                 site.yml

• rm_dest: The directory in which the files and directories for the resource module and facts modules should be placed
• structure: The directory layout to be generated (role|collection)
  • role: Generate a role directory layout
  • collection: Generate a collection directory layout
• collection_org: The organization of the collection, required when structure=collection
• collection_name: The name of the collection, required when structure=collection
• model: The path to the model file

Model

See the models directory for an example.

Examples

Collection directory layout

• network_os: myos
• resource: interfaces

ansible-playbook -e rm_dest=~/github/rm_example \
                 -e structure=collection \
                 -e collection_org=cidrblock \
                 -e collection_name=my_collection \
                 -e model=models/myos/interfaces/myos_interfaces.yml \
                 site.yml

├── docs
├── playbooks
├── plugins
│   ├── action
│   ├── filter
│   ├── inventory
│   ├── modules
│   │   ├── __init__.py
│   │   ├── myos_facts.py
│   │   └── myos_interfaces.py
│   └── module_utils
│       ├── __init__.py
│       └── network
│           ├── __init__.py
│           └── myos
│               ├── argspec
│               │   ├── facts
│               │   │   ├── facts.py
│               │   │   └── __init__.py
│               │   ├── __init__.py
│               │   └── interfaces
│               │       ├── __init__.py
│               │       └── interfaces.py
│               ├── config
│               │   ├── base.py
│               │   ├── __init__.py
│               │   └── interfaces
│               │       ├── __init__.py
│               │       └── interfaces.py
│               ├── facts
│               │   ├── base.py
│               │   ├── facts.py
│               │   ├── __init__.py
│               │   └── interfaces
│               │       ├── __init__.py
│               │       └── interfaces.py
│               ├── __init__.py
│               └── utils
│                   ├── __init__.py
│                   └── utils.py
├── README.md
├── roles

 

Role directory layout

• network_os: myos
• resource: interfaces

ansible-playbook -e rm_dest=~/github/rm_example/roles/my_role \
                 -e structure=role \
                 -e model=models/myos/interfaces/myos_interfaces.yml \
                 site.yml

roles
└── my_role
    ├── library
    │   ├── __init__.py
    │   ├── myos_facts.py
    │   └── myos_interfaces.py
    ├── LICENSE.txt
    ├── module_utils
    │   ├── __init__.py
    │   └── network
    │       ├── __init__.py
    │       └── myos
    │           ├── argspec
    │           │   ├── facts
    │           │   │   ├── facts.py
    │           │   │   └── __init__.py
    │           │   ├── __init__.py
    │           │   └── interfaces
    │           │       ├── __init__.py
    │           │       └── interfaces.py
    │           ├── config
    │           │   ├── base.py
    │           │   ├── __init__.py
    │           │   └── interfaces
    │           │       ├── __init__.py
    │           │       └── interfaces.py
    │           ├── facts
    │           │   ├── base.py
    │           │   ├── facts.py
    │           │   ├── __init__.py
    │           │   └── interfaces
    │           │       ├── __init__.py
    │           │       └── interfaces.py
    │           ├── __init__.py
    │           └── utils
    │               ├── __init__.py
    │               └── utils.py
    └── README.md

Using the collection layout

git clone git@github.com:ansible/ansible.git
cd ansible
git fetch origin pull/52194/head:collection_test
git checkout collection_test

link the generated collection to ~/.ansible/collections/ansible_collections/<collection_org>/<collection_name>

ln -s ~/github/rm_example ~/.ansible/collections/ansible_collections/cidrblock/my_collection

site.yml

- hosts: myos101
  gather_facts: False
  tasks:
  - cidrblock.my_collection.myos_interfaces:
    register: result
  - debug:
      var: result
  - cidrblock.my_collection.myos_facts:
  - debug:
      var: ansible_network_resources

Using the role layout

site.yml

- hosts: myos101
  gather_facts: False
  roles:
  - my_role

- hosts: myos101
  gather_facts: False
  tasks:
  - myos_interfaces:
    register: result
  - debug:
      var: result
  - myos_facts:
  - debug:
      var: ansible_network_resources

Resource Module Structure/Workflow

Module

library/<ansible_network_os>_<resource>.py.

• Import module_utils resource package and calls execute_module API

def main():
    result = <resource_package>(module).execute_module()

Module Argspec

module_utils/<ansible_network_os>/argspec/<resource>/.

• Argspec for the resource.

Facts

module_utils/<ansible_network_os>/facts/<resource>/.

• Populate facts for the resource.
• Entry in module_utils/<ansible_network_os>/facts/facts.py for get_facts API to keep <ansible_network_os>_facts module and facts gathered for the resource module in sync for every subset.

Module Package in module_utils

module_utils/<ansible_network_os>/<config>/<resource>/.

• Implement execute_module API that loads the config to device and generates the result with changed, commands, before and after keys.
• Call get_facts API that returns the <resource> config facts or return the diff if the device has onbox diff support.
• Compare facts gathered and given key-values if diff is not supported.
• Generate final config.

Utils

module_utils/<ansible_network_os>/utils.

• Utilities for the <ansible_network_os> platform.

Developer Notes

The tests rely on a role generated by the resource module builder. After changes to the resource module builder, the role should be regenerated and the tests modified and run as needed. To generate the role after changes:

rm -rf rmb_tests/roles/my_role
ansible-playbook -e rm_dest=./rmb_tests/roles/my_role \
                 -e structure=role \
                 -e model=models/myos/interfaces/myos_interfaces.yml \
                 site.yml