342 lines
9.6 KiB
Python
342 lines
9.6 KiB
Python
#!/usr/bin/env python
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'''
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nsot
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====
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Ansible Dynamic Inventory to pull hosts from NSoT, a flexible CMDB by Dropbox
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Features
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--------
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* Define host groups in form of NSoT device attribute criteria
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* All parameters defined by the spec as of 2015-09-05 are supported.
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+ ``--list``: Returns JSON hash of host groups -> hosts and top-level
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``_meta`` -> ``hostvars`` which correspond to all device attributes.
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Group vars can be specified in the YAML configuration, noted below.
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+ ``--host <hostname>``: Returns JSON hash where every item is a device
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attribute.
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* In addition to all attributes assigned to resource being returned, script
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will also append ``site_id`` and ``id`` as facts to utilize.
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Confguration
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------------
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Since it'd be annoying and failure prone to guess where you're configuration
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file is, use ``NSOT_INVENTORY_CONFIG`` to specify the path to it.
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This file should adhere to the YAML spec. All top-level variable must be
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desired Ansible group-name hashed with single 'query' item to define the NSoT
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attribute query.
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Queries follow the normal NSoT query syntax, `shown here`_
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.. _shown here: https://github.com/dropbox/pynsot#set-queries
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.. code:: yaml
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routers:
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query: 'deviceType=ROUTER'
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vars:
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a: b
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c: d
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juniper_fw:
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query: 'deviceType=FIREWALL manufacturer=JUNIPER'
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not_f10:
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query: '-manufacturer=FORCE10'
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The inventory will automatically use your ``.pynsotrc`` like normal pynsot from
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cli would, so make sure that's configured appropriately.
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.. note::
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Attributes I'm showing above are influenced from ones that the Trigger
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project likes. As is the spirit of NSoT, use whichever attributes work best
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for your workflow.
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If config file is blank or absent, the following default groups will be
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created:
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* ``routers``: deviceType=ROUTER
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* ``switches``: deviceType=SWITCH
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* ``firewalls``: deviceType=FIREWALL
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These are likely not useful for everyone so please use the configuration. :)
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.. note::
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By default, resources will only be returned for what your default
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site is set for in your ``~/.pynsotrc``.
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If you want to specify, add an extra key under the group for ``site: n``.
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Output Examples
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---------------
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Here are some examples shown from just calling the command directly::
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$ NSOT_INVENTORY_CONFIG=$PWD/test.yaml ansible_nsot --list | jq '.'
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{
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"routers": {
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"hosts": [
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"test1.example.com"
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],
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"vars": {
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"cool_level": "very",
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"group": "routers"
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}
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},
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"firewalls": {
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"hosts": [
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"test2.example.com"
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],
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"vars": {
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"cool_level": "enough",
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"group": "firewalls"
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}
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},
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"_meta": {
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"hostvars": {
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"test2.example.com": {
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"make": "SRX",
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"site_id": 1,
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"id": 108
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},
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"test1.example.com": {
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"make": "MX80",
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"site_id": 1,
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"id": 107
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}
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}
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},
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"rtr_and_fw": {
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"hosts": [
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"test1.example.com",
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"test2.example.com"
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],
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"vars": {}
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}
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}
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$ NSOT_INVENTORY_CONFIG=$PWD/test.yaml ansible_nsot --host test1 | jq '.'
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{
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"make": "MX80",
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"site_id": 1,
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"id": 107
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}
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'''
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from __future__ import print_function
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import sys
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import os
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import pkg_resources
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import argparse
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import json
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import yaml
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from textwrap import dedent
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from pynsot.client import get_api_client
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from pynsot.app import HttpServerError
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from click.exceptions import UsageError
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from six import string_types
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def warning(*objs):
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print("WARNING: ", *objs, file=sys.stderr)
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class NSoTInventory(object):
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'''NSoT Client object for gather inventory'''
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def __init__(self):
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self.config = dict()
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config_env = os.environ.get('NSOT_INVENTORY_CONFIG')
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if config_env:
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try:
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config_file = os.path.abspath(config_env)
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except IOError: # If file non-existent, use default config
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self._config_default()
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except Exception as e:
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sys.exit('%s\n' % e)
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with open(config_file) as f:
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try:
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self.config.update(yaml.safe_load(f))
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except TypeError: # If empty file, use default config
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warning('Empty config file')
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self._config_default()
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except Exception as e:
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sys.exit('%s\n' % e)
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else: # Use defaults if env var missing
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self._config_default()
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self.groups = self.config.keys()
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self.client = get_api_client()
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self._meta = {'hostvars': dict()}
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def _config_default(self):
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default_yaml = '''
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---
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routers:
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query: deviceType=ROUTER
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switches:
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query: deviceType=SWITCH
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firewalls:
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query: deviceType=FIREWALL
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'''
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self.config = yaml.safe_load(dedent(default_yaml))
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def do_list(self):
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'''Direct callback for when ``--list`` is provided
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Relies on the configuration generated from init to run
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_inventory_group()
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'''
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inventory = dict()
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for group, contents in self.config.items():
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group_response = self._inventory_group(group, contents)
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inventory.update(group_response)
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inventory.update({'_meta': self._meta})
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return json.dumps(inventory)
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def do_host(self, host):
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return json.dumps(self._hostvars(host))
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def _hostvars(self, host):
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'''Return dictionary of all device attributes
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Depending on number of devices in NSoT, could be rather slow since this
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has to request every device resource to filter through
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'''
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device = [i for i in self.client.devices.get()
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if host in i['hostname']][0]
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attributes = device['attributes']
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attributes.update({'site_id': device['site_id'], 'id': device['id']})
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return attributes
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def _inventory_group(self, group, contents):
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'''Takes a group and returns inventory for it as dict
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:param group: Group name
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:type group: str
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:param contents: The contents of the group's YAML config
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:type contents: dict
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contents param should look like::
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{
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'query': 'xx',
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'vars':
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'a': 'b'
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}
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Will return something like::
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{ group: {
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hosts: [],
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vars: {},
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}
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'''
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query = contents.get('query')
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hostvars = contents.get('vars', dict())
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site = contents.get('site', dict())
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obj = {group: dict()}
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obj[group]['hosts'] = []
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obj[group]['vars'] = hostvars
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try:
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assert isinstance(query, string_types)
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except:
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sys.exit('ERR: Group queries must be a single string\n'
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' Group: %s\n'
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' Query: %s\n' % (group, query)
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)
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try:
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if site:
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site = self.client.sites(site)
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devices = site.devices.query.get(query=query)
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else:
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devices = self.client.devices.query.get(query=query)
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except HttpServerError as e:
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if '500' in str(e.response):
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_site = 'Correct site id?'
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_attr = 'Queried attributes actually exist?'
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questions = _site + '\n' + _attr
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sys.exit('ERR: 500 from server.\n%s' % questions)
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else:
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raise
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except UsageError:
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sys.exit('ERR: Could not connect to server. Running?')
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# Would do a list comprehension here, but would like to save code/time
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# and also acquire attributes in this step
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for host in devices:
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# Iterate through each device that matches query, assign hostname
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# to the group's hosts array and then use this single iteration as
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# a chance to update self._meta which will be used in the final
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# return
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hostname = host['hostname']
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obj[group]['hosts'].append(hostname)
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attributes = host['attributes']
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attributes.update({'site_id': host['site_id'], 'id': host['id']})
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self._meta['hostvars'].update({hostname: attributes})
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return obj
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def parse_args():
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desc = __doc__.splitlines()[4] # Just to avoid being redundant
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# Establish parser with options and error out if no action provided
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parser = argparse.ArgumentParser(
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description=desc,
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conflict_handler='resolve',
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)
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# Arguments
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#
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# Currently accepting (--list | -l) and (--host | -h)
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# These must not be allowed together
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parser.add_argument(
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'--list', '-l',
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help='Print JSON object containing hosts to STDOUT',
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action='store_true',
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dest='list_', # Avoiding syntax highlighting for list
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)
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parser.add_argument(
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'--host', '-h',
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help='Print JSON object containing hostvars for <host>',
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action='store',
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)
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args = parser.parse_args()
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if not args.list_ and not args.host: # Require at least one option
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parser.exit(status=1, message='No action requested')
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if args.list_ and args.host: # Do not allow multiple options
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parser.exit(status=1, message='Too many actions requested')
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return args
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def main():
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'''Set up argument handling and callback routing'''
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args = parse_args()
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client = NSoTInventory()
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# Callback condition
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if args.list_:
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print(client.do_list())
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elif args.host:
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print(client.do_host(args.host))
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if __name__ == '__main__':
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main()
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