summaryrefslogtreecommitdiffstats
path: root/contrib/inventory/foreman.py
blob: 4d6fd32b8099e52cdf0aab996f97078e779da1c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
#!/usr/bin/env python
# vim: set fileencoding=utf-8 :
#
# Copyright (C) 2016 Guido Günther <agx@sigxcpu.org>,
#                    Daniel Lobato Garcia <dlobatog@redhat.com>
#
# This script is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with it.  If not, see <http://www.gnu.org/licenses/>.
#
# This is somewhat based on cobbler inventory

# Stdlib imports
# __future__ imports must occur at the beginning of file
from __future__ import print_function
try:
    # Python 2 version
    import ConfigParser
except ImportError:
    # Python 3 version
    import configparser as ConfigParser
import json
import argparse
import copy
import os
import re
import sys
from time import time
from collections import defaultdict
from distutils.version import LooseVersion, StrictVersion

# 3rd party imports
import requests
if LooseVersion(requests.__version__) < LooseVersion('1.1.0'):
    print('This script requires python-requests 1.1 as a minimum version')
    sys.exit(1)

from requests.auth import HTTPBasicAuth


def json_format_dict(data, pretty=False):
    """Converts a dict to a JSON object and dumps it as a formatted string"""

    if pretty:
        return json.dumps(data, sort_keys=True, indent=2)
    else:
        return json.dumps(data)


class ForemanInventory(object):

    def __init__(self):
        self.inventory = defaultdict(list)  # A list of groups and the hosts in that group
        self.cache = dict()   # Details about hosts in the inventory
        self.params = dict()  # Params of each host
        self.facts = dict()   # Facts of each host
        self.hostgroups = dict()  # host groups
        self.hostcollections = dict()  # host collections
        self.session = None   # Requests session
        self.config_paths = [
            "/etc/ansible/foreman.ini",
            os.path.dirname(os.path.realpath(__file__)) + '/foreman.ini',
        ]
        env_value = os.environ.get('FOREMAN_INI_PATH')
        if env_value is not None:
            self.config_paths.append(os.path.expanduser(os.path.expandvars(env_value)))

    def read_settings(self):
        """Reads the settings from the foreman.ini file"""

        config = ConfigParser.SafeConfigParser()
        config.read(self.config_paths)

        # Foreman API related
        try:
            self.foreman_url = config.get('foreman', 'url')
            self.foreman_user = config.get('foreman', 'user')
            self.foreman_pw = config.get('foreman', 'password')
            self.foreman_ssl_verify = config.getboolean('foreman', 'ssl_verify')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError) as e:
            print("Error parsing configuration: %s" % e, file=sys.stderr)
            return False

        # Ansible related
        try:
            group_patterns = config.get('ansible', 'group_patterns')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            group_patterns = "[]"

        self.group_patterns = json.loads(group_patterns)

        try:
            self.group_prefix = config.get('ansible', 'group_prefix')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            self.group_prefix = "foreman_"

        try:
            self.want_facts = config.getboolean('ansible', 'want_facts')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            self.want_facts = True

        try:
            self.want_hostcollections = config.getboolean('ansible', 'want_hostcollections')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            self.want_hostcollections = False

        # Do we want parameters to be interpreted if possible as JSON? (no by default)
        try:
            self.rich_params = config.getboolean('ansible', 'rich_params')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            self.rich_params = False

        try:
            self.host_filters = config.get('foreman', 'host_filters')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            self.host_filters = None

        # Cache related
        try:
            cache_path = os.path.expanduser(config.get('cache', 'path'))
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            cache_path = '.'
        (script, ext) = os.path.splitext(os.path.basename(__file__))
        self.cache_path_cache = cache_path + "/%s.cache" % script
        self.cache_path_inventory = cache_path + "/%s.index" % script
        self.cache_path_params = cache_path + "/%s.params" % script
        self.cache_path_facts = cache_path + "/%s.facts" % script
        self.cache_path_hostcollections = cache_path + "/%s.hostcollections" % script
        try:
            self.cache_max_age = config.getint('cache', 'max_age')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            self.cache_max_age = 60
        try:
            self.scan_new_hosts = config.getboolean('cache', 'scan_new_hosts')
        except (ConfigParser.NoOptionError, ConfigParser.NoSectionError):
            self.scan_new_hosts = False

        return True

    def parse_cli_args(self):
        """Command line argument processing"""

        parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on foreman')
        parser.add_argument('--list', action='store_true', default=True, help='List instances (default: True)')
        parser.add_argument('--host', action='store', help='Get all the variables about a specific instance')
        parser.add_argument('--refresh-cache', action='store_true', default=False,
                            help='Force refresh of cache by making API requests to foreman (default: False - use cache files)')
        self.args = parser.parse_args()

    def _get_session(self):
        if not self.session:
            self.session = requests.session()
            self.session.auth = HTTPBasicAuth(self.foreman_user, self.foreman_pw)
            self.session.verify = self.foreman_ssl_verify
        return self.session

    def _get_json(self, url, ignore_errors=None, params=None):
        if params is None:
            params = {}
        params['per_page'] = 250

        page = 1
        results = []
        s = self._get_session()
        while True:
            params['page'] = page
            ret = s.get(url, params=params)
            if ignore_errors and ret.status_code in ignore_errors:
                break
            ret.raise_for_status()
            json = ret.json()
            # /hosts/:id has not results key
            if 'results' not in json:
                return json
            # Facts are returned as dict in results not list
            if isinstance(json['results'], dict):
                return json['results']
            # List of all hosts is returned paginaged
            results = results + json['results']
            if len(results) >= json['subtotal']:
                break
            page += 1
            if len(json['results']) == 0:
                print("Did not make any progress during loop. "
                      "expected %d got %d" % (json['total'], len(results)),
                      file=sys.stderr)
                break
        return results

    def _get_hosts(self):
        url = "%s/api/v2/hosts" % self.foreman_url

        params = {}
        if self.host_filters:
            params['search'] = self.host_filters

        return self._get_json(url, params=params)

    def _get_host_data_by_id(self, hid):
        url = "%s/api/v2/hosts/%s" % (self.foreman_url, hid)
        return self._get_json(url)

    def _get_facts_by_id(self, hid):
        url = "%s/api/v2/hosts/%s/facts" % (self.foreman_url, hid)
        return self._get_json(url)

    def _resolve_params(self, host_params):
        """Convert host params to dict"""
        params = {}

        for param in host_params:
            name = param['name']
            if self.rich_params:
                try:
                    params[name] = json.loads(param['value'])
                except ValueError:
                    params[name] = param['value']
            else:
                params[name] = param['value']

        return params

    def _get_facts_by_id(self, hid):
        url = "%s/api/v2/hosts/%s/facts" % (self.foreman_url, hid)
        return self._get_json(url)

    def _get_facts(self, host):
        """Fetch all host facts of the host"""
        if not self.want_facts:
            return {}

        ret = self._get_facts_by_id(host['id'])
        if len(ret.values()) == 0:
            facts = {}
        elif len(ret.values()) == 1:
            facts = list(ret.values())[0]
        else:
            raise ValueError("More than one set of facts returned for '%s'" % host)
        return facts

    def write_to_cache(self, data, filename):
        """Write data in JSON format to a file"""
        json_data = json_format_dict(data, True)
        cache = open(filename, 'w')
        cache.write(json_data)
        cache.close()

    def _write_cache(self):
        self.write_to_cache(self.cache, self.cache_path_cache)
        self.write_to_cache(self.inventory, self.cache_path_inventory)
        self.write_to_cache(self.params, self.cache_path_params)
        self.write_to_cache(self.facts, self.cache_path_facts)
        self.write_to_cache(self.hostcollections, self.cache_path_hostcollections)

    def to_safe(self, word):
        '''Converts 'bad' characters in a string to underscores
        so they can be used as Ansible groups

        >>> ForemanInventory.to_safe("foo-bar baz")
        'foo_barbaz'
        '''
        regex = r"[^A-Za-z0-9\_]"
        return re.sub(regex, "_", word.replace(" ", ""))

    def update_cache(self, scan_only_new_hosts=False):
        """Make calls to foreman and save the output in a cache"""

        self.groups = dict()
        self.hosts = dict()

        for host in self._get_hosts():
            if host['name'] in self.cache.keys() and scan_only_new_hosts:
                continue
            dns_name = host['name']

            host_data = self._get_host_data_by_id(host['id'])
            host_params = host_data.get('all_parameters', {})

            # Create ansible groups for hostgroup
            group = 'hostgroup'
            val = host.get('%s_title' % group) or host.get('%s_name' % group)
            if val:
                safe_key = self.to_safe('%s%s_%s' % (self.group_prefix, group, val.lower()))
                self.inventory[safe_key].append(dns_name)

            # Create ansible groups for environment, location and organization
            for group in ['environment', 'location', 'organization']:
                val = host.get('%s_name' % group)
                if val:
                    safe_key = self.to_safe('%s%s_%s' % (self.group_prefix, group, val.lower()))
                    self.inventory[safe_key].append(dns_name)

            for group in ['lifecycle_environment', 'content_view']:
                val = host.get('content_facet_attributes', {}).get('%s_name' % group)
                if val:
                    safe_key = self.to_safe('%s%s_%s' % (self.group_prefix, group, val.lower()))
                    self.inventory[safe_key].append(dns_name)

            params = self._resolve_params(host_params)

            # Ansible groups by parameters in host groups and Foreman host
            # attributes.
            groupby = dict()
            for k, v in params.items():
                groupby[k] = self.to_safe(str(v))

            # The name of the ansible groups is given by group_patterns:
            for pattern in self.group_patterns:
                try:
                    key = pattern.format(**groupby)
                    self.inventory[key].append(dns_name)
                except KeyError:
                    pass  # Host not part of this group

            if self.want_hostcollections:
                hostcollections = host_data.get('host_collections')

                if hostcollections:
                    # Create Ansible groups for host collections
                    for hostcollection in hostcollections:
                        safe_key = self.to_safe('%shostcollection_%s' % (self.group_prefix, hostcollection['name'].lower()))
                        self.inventory[safe_key].append(dns_name)

                self.hostcollections[dns_name] = hostcollections

            self.cache[dns_name] = host
            self.params[dns_name] = params
            self.facts[dns_name] = self._get_facts(host)
            self.inventory['all'].append(dns_name)
        self._write_cache()

    def is_cache_valid(self):
        """Determines if the cache is still valid"""
        if os.path.isfile(self.cache_path_cache):
            mod_time = os.path.getmtime(self.cache_path_cache)
            current_time = time()
            if (mod_time + self.cache_max_age) > current_time:
                if (os.path.isfile(self.cache_path_inventory) and
                    os.path.isfile(self.cache_path_params) and
                        os.path.isfile(self.cache_path_facts)):
                    return True
        return False

    def load_inventory_from_cache(self):
        """Read the index from the cache file sets self.index"""

        with open(self.cache_path_inventory, 'r') as fp:
            self.inventory = json.load(fp)

    def load_params_from_cache(self):
        """Read the index from the cache file sets self.index"""

        with open(self.cache_path_params, 'r') as fp:
            self.params = json.load(fp)

    def load_facts_from_cache(self):
        """Read the index from the cache file sets self.facts"""

        if not self.want_facts:
            return
        with open(self.cache_path_facts, 'r') as fp:
            self.facts = json.load(fp)

    def load_hostcollections_from_cache(self):
        """Read the index from the cache file sets self.hostcollections"""

        if not self.want_hostcollections:
            return
        with open(self.cache_path_hostcollections, 'r') as fp:
            self.hostcollections = json.load(fp)

    def load_cache_from_cache(self):
        """Read the cache from the cache file sets self.cache"""

        with open(self.cache_path_cache, 'r') as fp:
            self.cache = json.load(fp)

    def get_inventory(self):
        if self.args.refresh_cache or not self.is_cache_valid():
            self.update_cache()
        else:
            self.load_inventory_from_cache()
            self.load_params_from_cache()
            self.load_facts_from_cache()
            self.load_hostcollections_from_cache()
            self.load_cache_from_cache()
            if self.scan_new_hosts:
                self.update_cache(True)

    def get_host_info(self):
        """Get variables about a specific host"""

        if not self.cache or len(self.cache) == 0:
            # Need to load index from cache
            self.load_cache_from_cache()

        if self.args.host not in self.cache:
            # try updating the cache
            self.update_cache()

            if self.args.host not in self.cache:
                # host might not exist anymore
                return json_format_dict({}, True)

        return json_format_dict(self.cache[self.args.host], True)

    def _print_data(self):
        data_to_print = ""
        if self.args.host:
            data_to_print += self.get_host_info()
        else:
            self.inventory['_meta'] = {'hostvars': {}}
            for hostname in self.cache:
                self.inventory['_meta']['hostvars'][hostname] = {
                    'foreman': self.cache[hostname],
                    'foreman_params': self.params[hostname],
                }
                if self.want_facts:
                    self.inventory['_meta']['hostvars'][hostname]['foreman_facts'] = self.facts[hostname]

            data_to_print += json_format_dict(self.inventory, True)

        print(data_to_print)

    def run(self):
        # Read settings and parse CLI arguments
        if not self.read_settings():
            return False
        self.parse_cli_args()
        self.get_inventory()
        self._print_data()
        return True

if __name__ == '__main__':
    sys.exit(not ForemanInventory().run())