kubespray/contrib/terraform/terraform.py

#!/usr/bin/env python2
#
# Copyright 2015 Cisco Systems, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# original: https://github.com/CiscoCloud/terraform.py

"""\
Dynamic inventory for Terraform - finds all `.tfstate` files below the working
directory and generates an inventory based on them.
"""
from __future__ import unicode_literals, print_function
import argparse
from collections import defaultdict
from functools import wraps
import json
import os
import re

VERSION = '0.3.0pre'


def tfstates(root=None):
    root = root or os.getcwd()
    for dirpath, _, filenames in os.walk(root):
        for name in filenames:
            if os.path.splitext(name)[-1] == '.tfstate':
                yield os.path.join(dirpath, name)


def iterresources(filenames):
    for filename in filenames:
        with open(filename, 'r') as json_file:
            state = json.load(json_file)
            for module in state['modules']:
                name = module['path'][-1]
                for key, resource in module['resources'].items():
                    yield name, key, resource

## READ RESOURCES
PARSERS = {}


def _clean_dc(dcname):
    # Consul DCs are strictly alphanumeric with underscores and hyphens -
    # ensure that the consul_dc attribute meets these requirements.
    return re.sub('[^\w_\-]', '-', dcname)


def iterhosts(resources):
    '''yield host tuples of (name, attributes, groups)'''
    for module_name, key, resource in resources:
        resource_type, name = key.split('.', 1)
        try:
            parser = PARSERS[resource_type]
        except KeyError:
            continue

        yield parser(resource, module_name)


def iterips(resources):
    '''yield ip tuples of (instance_id, ip)'''
    for module_name, key, resource in resources:
        resource_type, name = key.split('.', 1)
        if resource_type == 'openstack_compute_floatingip_associate_v2':
            yield openstack_floating_ips(resource)


def parses(prefix):
    def inner(func):
        PARSERS[prefix] = func
        return func

    return inner


def calculate_mantl_vars(func):
    """calculate Mantl vars"""

    @wraps(func)
    def inner(*args, **kwargs):
        name, attrs, groups = func(*args, **kwargs)

        # attrs
        if attrs.get('role', '') == 'control':
            attrs['consul_is_server'] = True
        else:
            attrs['consul_is_server'] = False

        # groups
        if attrs.get('publicly_routable', False):
            groups.append('publicly_routable')

        return name, attrs, groups

    return inner


def _parse_prefix(source, prefix, sep='.'):
    for compkey, value in source.items():
        try:
            curprefix, rest = compkey.split(sep, 1)
        except ValueError:
            continue

        if curprefix != prefix or rest == '#':
            continue

        yield rest, value


def parse_attr_list(source, prefix, sep='.'):
    attrs = defaultdict(dict)
    for compkey, value in _parse_prefix(source, prefix, sep):
        idx, key = compkey.split(sep, 1)
        attrs[idx][key] = value

    return attrs.values()


def parse_dict(source, prefix, sep='.'):
    return dict(_parse_prefix(source, prefix, sep))


def parse_list(source, prefix, sep='.'):
    return [value for _, value in _parse_prefix(source, prefix, sep)]


def parse_bool(string_form):
    token = string_form.lower()[0]

    if token == 't':
        return True
    elif token == 'f':
        return False
    else:
        raise ValueError('could not convert %r to a bool' % string_form)


@parses('packet_device')
def packet_device(resource, tfvars=None):
    raw_attrs = resource['primary']['attributes']
    name = raw_attrs['hostname']
    groups = []

    attrs = {
        'id': raw_attrs['id'],
        'facilities': parse_list(raw_attrs, 'facilities']),
        'hostname': raw_attrs['hostname'],
        'operating_system': raw_attrs['operating_system'],
        'locked': parse_bool(raw_attrs['locked']),
        'tags': parse_list(raw_attrs, 'tags'),
        'plan': raw_attrs['plan'],
        'project_id': raw_attrs['project_id'],
        'state': raw_attrs['state'],
        # ansible
        'ansible_ssh_host': raw_attrs['network.0.address'],
        'ansible_ssh_user': 'root',  # it's always "root" on Packet
        # generic
        'ipv4_address': raw_attrs['network.0.address'],
        'public_ipv4': raw_attrs['network.0.address'],
        'ipv6_address': raw_attrs['network.1.address'],
        'public_ipv6': raw_attrs['network.1.address'],
        'private_ipv4': raw_attrs['network.2.address'],
        'provider': 'packet',
    }

    # add groups based on attrs
    groups.append('packet_facilities=' + attrs['facilities'])
    groups.append('packet_operating_system=' + attrs['operating_system'])
    groups.append('packet_locked=%s' % attrs['locked'])
    groups.append('packet_state=' + attrs['state'])
    groups.append('packet_plan=' + attrs['plan'])

    # groups specific to kubespray
    groups = groups + attrs['tags']

    return name, attrs, groups


def openstack_floating_ips(resource):
    raw_attrs = resource['primary']['attributes']
    attrs = {
        'ip': raw_attrs['floating_ip'],
        'instance_id': raw_attrs['instance_id'],
    }
    return attrs

def openstack_floating_ips(resource):
    raw_attrs = resource['primary']['attributes']
    return raw_attrs['instance_id'], raw_attrs['floating_ip']

@parses('openstack_compute_instance_v2')
@calculate_mantl_vars
def openstack_host(resource, module_name):
    raw_attrs = resource['primary']['attributes']
    name = raw_attrs['name']
    groups = []

    attrs = {
        'access_ip_v4': raw_attrs['access_ip_v4'],
        'access_ip_v6': raw_attrs['access_ip_v6'],
        'access_ip': raw_attrs['access_ip_v4'],
        'ip': raw_attrs['network.0.fixed_ip_v4'],
        'flavor': parse_dict(raw_attrs, 'flavor',
                             sep='_'),
        'id': raw_attrs['id'],
        'image': parse_dict(raw_attrs, 'image',
                            sep='_'),
        'key_pair': raw_attrs['key_pair'],
        'metadata': parse_dict(raw_attrs, 'metadata'),
        'network': parse_attr_list(raw_attrs, 'network'),
        'region': raw_attrs.get('region', ''),
        'security_groups': parse_list(raw_attrs, 'security_groups'),
        # ansible
        'ansible_ssh_port': 22,
        # workaround for an OpenStack bug where hosts have a different domain
        # after they're restarted
        'host_domain': 'novalocal',
        'use_host_domain': True,
        # generic
        'public_ipv4': raw_attrs['access_ip_v4'],
        'private_ipv4': raw_attrs['access_ip_v4'],
        'provider': 'openstack',
    }

    if 'floating_ip' in raw_attrs:
        attrs['private_ipv4'] = raw_attrs['network.0.fixed_ip_v4']

    try:
        attrs.update({
            'ansible_ssh_host': raw_attrs['access_ip_v4'],
            'publicly_routable': True,
        })
    except (KeyError, ValueError):
        attrs.update({'ansible_ssh_host': '', 'publicly_routable': False})

    # Handling of floating IPs has changed: https://github.com/terraform-providers/terraform-provider-openstack/blob/master/CHANGELOG.md#010-june-21-2017

    # attrs specific to Ansible
    if 'metadata.ssh_user' in raw_attrs:
        attrs['ansible_ssh_user'] = raw_attrs['metadata.ssh_user']

    if 'volume.#' in raw_attrs.keys() and int(raw_attrs['volume.#']) > 0:
        device_index = 1
        for key, value in raw_attrs.items():
            match = re.search("^volume.*.device$", key)
            if match:
                attrs['disk_volume_device_'+str(device_index)] = value
                device_index += 1


    # attrs specific to Mantl
    attrs.update({
        'consul_dc': _clean_dc(attrs['metadata'].get('dc', module_name)),
        'role': attrs['metadata'].get('role', 'none'),
        'ansible_python_interpreter': attrs['metadata'].get('python_bin','python')
    })

    # add groups based on attrs
    groups.append('os_image=' + attrs['image']['name'])
    groups.append('os_flavor=' + attrs['flavor']['name'])
    groups.extend('os_metadata_%s=%s' % item
                  for item in attrs['metadata'].items())
    groups.append('os_region=' + attrs['region'])

    # groups specific to Mantl
    groups.append('role=' + attrs['metadata'].get('role', 'none'))
    groups.append('dc=' + attrs['consul_dc'])

    # groups specific to kubespray
    for group in attrs['metadata'].get('kubespray_groups', "").split(","):
        groups.append(group)

    return name, attrs, groups


def iter_host_ips(hosts, ips):
    '''Update hosts that have an entry in the floating IP list'''
    for host in hosts:
        host_id = host[1]['id']
        if host_id in ips:
            ip = ips[host_id]
            host[1].update({
                'access_ip_v4': ip,
                'access_ip': ip,
                'public_ipv4': ip,
                'ansible_ssh_host': ip,
            })
        yield host


## QUERY TYPES
def query_host(hosts, target):
    for name, attrs, _ in hosts:
        if name == target:
            return attrs

    return {}


def query_list(hosts):
    groups = defaultdict(dict)
    meta = {}

    for name, attrs, hostgroups in hosts:
        for group in set(hostgroups):
            # Ansible 2.6.2 stopped supporting empty group names: https://github.com/ansible/ansible/pull/42584/commits/d4cd474b42ed23d8f8aabb2a7f84699673852eaf
            # Empty group name defaults to "all" in Ansible < 2.6.2 so we alter empty group names to "all"
            if not group: group = "all"

            groups[group].setdefault('hosts', [])
            groups[group]['hosts'].append(name)

        meta[name] = attrs

    groups['_meta'] = {'hostvars': meta}
    return groups


def query_hostfile(hosts):
    out = ['## begin hosts generated by terraform.py ##']
    out.extend(
        '{}\t{}'.format(attrs['ansible_ssh_host'].ljust(16), name)
        for name, attrs, _ in hosts
    )

    out.append('## end hosts generated by terraform.py ##')
    return '\n'.join(out)


def main():
    parser = argparse.ArgumentParser(
        __file__, __doc__,
        formatter_class=argparse.ArgumentDefaultsHelpFormatter, )
    modes = parser.add_mutually_exclusive_group(required=True)
    modes.add_argument('--list',
                       action='store_true',
                       help='list all variables')
    modes.add_argument('--host', help='list variables for a single host')
    modes.add_argument('--version',
                       action='store_true',
                       help='print version and exit')
    modes.add_argument('--hostfile',
                       action='store_true',
                       help='print hosts as a /etc/hosts snippet')
    parser.add_argument('--pretty',
                        action='store_true',
                        help='pretty-print output JSON')
    parser.add_argument('--nometa',
                        action='store_true',
                        help='with --list, exclude hostvars')
    default_root = os.environ.get('TERRAFORM_STATE_ROOT',
                                  os.path.abspath(os.path.join(os.path.dirname(__file__),
                                                               '..', '..', )))
    parser.add_argument('--root',
                        default=default_root,
                        help='custom root to search for `.tfstate`s in')

    args = parser.parse_args()

    if args.version:
        print('%s %s' % (__file__, VERSION))
        parser.exit()

    hosts = iterhosts(iterresources(tfstates(args.root)))

    # Perform a second pass on the file to pick up floating_ip entries to update the ip address of referenced hosts
    ips = dict(iterips(iterresources(tfstates(args.root))))

    if ips:
        hosts = iter_host_ips(hosts, ips)

    if args.list:
        output = query_list(hosts)
        if args.nometa:
            del output['_meta']
        print(json.dumps(output, indent=4 if args.pretty else None))
    elif args.host:
        output = query_host(hosts, args.host)
        print(json.dumps(output, indent=4 if args.pretty else None))
    elif args.hostfile:
        output = query_hostfile(hosts)
        print(output)

    parser.exit()


if __name__ == '__main__':
    main()