ansible/cloud/rax_clb

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#!/usr/bin/python
# This file is part of Ansible
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
DOCUMENTATION = '''
---
module: rax_clb_nodes
short_description: add, modify and remove nodes from a Rackspace Cloud Load Balancer
description:
- Adds, modifies and removes nodes from a Rackspace Cloud Load Balancer
version_added: "1.4"
options:
address:
required: false
description:
- IP address or domain name of the node
api_key:
required: false
description:
- Rackspace API key (overrides C(credentials))
condition:
required: false
choices: [ "enabled", "disabled", "draining" ]
description:
- Condition for the node, which determines its role within the load
balancer
credentials:
required: false
description:
- File to find the Rackspace credentials in (ignored if C(api_key) and
C(username) are provided)
load_balancer_id:
required: true
type: integer
description:
- Load balancer id
node_id:
required: false
type: integer
description:
- Node id
port:
required: false
type: integer
description:
- Port number of the load balanced service on the node
region:
required: false
description:
- Region to authenticate in
state:
required: false
default: "present"
choices: [ "present", "absent" ]
description:
- Indicate desired state of the node
type:
required: false
choices: [ "primary", "secondary" ]
description:
- Type of node
username:
required: false
description:
- Rackspace username (overrides C(credentials))
virtualenv:
required: false
description:
- Path to a virtualenv that should be activated before doing anything.
The virtualenv has to already exist. Useful if installing pyrax
globally is not an option.
wait:
required: false
default: "no"
choices: [ "yes", "no" ]
description:
- Wait for the load balancer to become active before returning
wait_timeout:
required: false
type: integer
default: 30
description:
- How long to wait before giving up and returning an error
weight:
required: false
description:
- Weight of node
requirements: [ "pyrax" ]
author: Lukasz Kawczynski
notes:
- "The following environment variables can be used: C(RAX_USERNAME),
C(RAX_API_KEY), C(RAX_CREDENTIALS) and C(RAX_REGION)."
'''
EXAMPLES = '''
# Add a new node to the load balancer
- local_action:
module: rax_clb_nodes
load_balancer_id: 71
address: 10.2.2.3
port: 80
condition: enabled
type: primary
wait: yes
credentials: /path/to/credentials
# Drain connections from a node
- local_action:
module: rax_clb_nodes
load_balancer_id: 71
node_id: 410
condition: draining
wait: yes
credentials: /path/to/credentials
# Remove a node from the load balancer
- local_action:
module: rax_clb_nodes
load_balancer_id: 71
node_id: 410
state: absent
wait: yes
credentials: /path/to/credentials
'''
import os
def _activate_virtualenv(path):
path = os.path.expanduser(path)
activate_this = os.path.join(path, 'bin', 'activate_this.py')
execfile(activate_this, dict(__file__=activate_this))
def _get_node(lb, node_id):
"""Return a node with the given `node_id`"""
for node in lb.nodes:
if node.id == node_id:
return node
return None
def _is_primary(node):
"""Return True if node is primary and enabled"""
return (node.type.lower() == 'primary' and
node.condition.lower() == 'enabled')
def _get_primary_nodes(lb):
"""Return a list of primary and enabled nodes"""
nodes = []
for node in lb.nodes:
if _is_primary(node):
nodes.append(node)
return nodes
def _node_to_dict(node):
"""Return a dictionary containing node details"""
if not node:
return {}
return {
'address': node.address,
'condition': node.condition,
'id': node.id,
'port': node.port,
'type': node.type,
'weight': node.weight,
}
def main():
module = AnsibleModule(
argument_spec=dict(
address=dict(),
api_key=dict(),
condition=dict(choices=['enabled', 'disabled', 'draining']),
credentials=dict(),
load_balancer_id=dict(required=True, type='int'),
node_id=dict(type='int'),
port=dict(type='int'),
region=dict(),
state=dict(default='present', choices=['present', 'absent']),
type=dict(choices=['primary', 'secondary']),
username=dict(),
virtualenv=dict(),
wait=dict(default=False, choices=BOOLEANS, type='bool'),
wait_timeout=dict(default=30, type='int'),
weight=dict(type='int'),
),
required_together=[
['api_key', 'username']
],
)
address = module.params['address']
api_key = module.params['api_key']
condition = (module.params['condition'] and
module.params['condition'].upper())
credentials = module.params['credentials']
load_balancer_id = module.params['load_balancer_id']
node_id = module.params['node_id']
port = module.params['port']
region = module.params['region']
state = module.params['state']
typ = module.params['type'] and module.params['type'].upper()
username = module.params['username']
virtualenv = module.params['virtualenv']
wait = module.params['wait']
wait_timeout = module.params['wait_timeout'] or 1
weight = module.params['weight']
if virtualenv:
try:
_activate_virtualenv(virtualenv)
except IOError, e:
module.fail_json(msg='Failed to activate virtualenv %s (%s)' % (
virtualenv, e))
try:
import pyrax
except ImportError:
module.fail_json(msg='pyrax is not installed')
username = username or os.environ.get('RAX_USERNAME')
api_key = api_key or os.environ.get('RAX_API_KEY')
credentials = credentials or os.environ.get('RAX_CREDENTIALS')
region = region or os.environ.get('RAX_REGION')
pyrax.set_setting("identity_type", "rackspace")
try:
if api_key and username:
pyrax.set_credentials(username, api_key=api_key, region=region)
elif credentials:
credentials = os.path.expanduser(credentials)
pyrax.set_credential_file(credentials, region=region)
else:
module.fail_json(msg='Credentials not set')
except pyrax.exc.PyraxException, e:
module.fail_json(msg='%s' % e.message)
if not pyrax.cloud_loadbalancers:
module.fail_json(msg='Failed to instantiate load balancer client '
'(possibly incorrect region)')
try:
lb = pyrax.cloud_loadbalancers.get(load_balancer_id)
except pyrax.exc.PyraxException, e:
module.fail_json(msg='%s' % e.message)
if node_id:
node = _get_node(lb, node_id)
else:
node = None
result = _node_to_dict(node)
if state == 'absent':
if not node: # Removing a non-existent node
module.exit_json(changed=False, state=state)
# The API detects this as well but currently pyrax does not return a
# meaningful error message
if _is_primary(node) and len(_get_primary_nodes(lb)) == 1:
module.fail_json(
msg='At least one primary node has to be enabled')
try:
lb.delete_node(node)
result = {}
except pyrax.exc.NotFound:
module.exit_json(changed=False, state=state)
except pyrax.exc.PyraxException, e:
module.fail_json(msg='%s' % e.message)
else: # present
if not node:
if node_id: # Updating a non-existent node
msg = 'Node %d not found' % node_id
if lb.nodes:
msg += (' (available nodes: %s)' %
', '.join([str(x.id) for x in lb.nodes]))
module.fail_json(msg=msg)
else: # Creating a new node
try:
node = pyrax.cloudloadbalancers.Node(
address=address, port=port, condition=condition,
weight=weight, type=typ)
resp, body = lb.add_nodes([node])
result.update(body['nodes'][0])
except pyrax.exc.PyraxException, e:
module.fail_json(msg='%s' % e.message)
else: # Updating an existing node
immutable = {
'address': address,
'port': port,
}
mutable = {
'condition': condition,
'type': typ,
'weight': weight,
}
for name, value in immutable.items():
if value:
module.fail_json(
msg='Attribute %s cannot be modified' % name)
for name, value in mutable.items():
if value is None or value == getattr(node, name):
mutable.pop(name)
if not mutable:
module.exit_json(changed=False, state=state, node=result)
try:
# The diff has to be set explicitly to update node's weight and
# type; this should probably be fixed in pyrax
lb.update_node(node, diff=mutable)
result.update(mutable)
except pyrax.exc.PyraxException, e:
module.fail_json(msg='%s' % e.message)
if wait:
pyrax.utils.wait_until(lb, "status", "ACTIVE", interval=1,
attempts=wait_timeout)
if lb.status != 'ACTIVE':
module.fail_json(
msg='Load balancer not active after %ds (current status: %s)' %
(wait_timeout, lb.status.lower()))
kwargs = {'node': result} if result else {}
module.exit_json(changed=True, state=state, **kwargs)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()