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ansible/library/cloud/rax_clb_nodes

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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/>.
# This is a DOCUMENTATION stub specific to this module, it extends
# a documentation fragment located in ansible.utils.module_docs_fragments
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
condition:
required: false
choices:
- enabled
- disabled
- draining
description:
- Condition for the node, which determines its role within the load
balancer
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
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
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
author: Lukasz Kawczynski
extends_documentation_fragment: rackspace
'''
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
'''
try:
import pyrax
HAS_PYRAX = True
except ImportError:
HAS_PYRAX = False
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=None, address=None, port=None):
"""Return a matching node"""
for node in getattr(lb, 'nodes', []):
match_list = []
if node_id is not None:
match_list.append(getattr(node, 'id', None) == node_id)
if address is not None:
match_list.append(getattr(node, 'address', None) == address)
if port is not None:
match_list.append(getattr(node, 'port', None) == port)
if match_list and all(match_list):
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 main():
argument_spec = rax_argument_spec()
argument_spec.update(
dict(
address=dict(),
condition=dict(choices=['enabled', 'disabled', 'draining']),
load_balancer_id=dict(required=True, type='int'),
node_id=dict(type='int'),
port=dict(type='int'),
state=dict(default='present', choices=['present', 'absent']),
type=dict(choices=['primary', 'secondary']),
virtualenv=dict(),
wait=dict(default=False, type='bool'),
wait_timeout=dict(default=30, type='int'),
weight=dict(type='int'),
)
)
module = AnsibleModule(
argument_spec=argument_spec,
required_together=rax_required_together(),
)
if not HAS_PYRAX:
module.fail_json(msg='pyrax is required for this module')
address = module.params['address']
condition = (module.params['condition'] and
module.params['condition'].upper())
load_balancer_id = module.params['load_balancer_id']
node_id = module.params['node_id']
port = module.params['port']
state = module.params['state']
typ = module.params['type'] and module.params['type'].upper()
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))
setup_rax_module(module, pyrax)
if not pyrax.cloud_loadbalancers:
module.fail_json(msg='Failed to instantiate client. This '
'typically indicates an invalid region or an '
'incorrectly capitalized region name.')
try:
lb = pyrax.cloud_loadbalancers.get(load_balancer_id)
except pyrax.exc.PyraxException, e:
module.fail_json(msg='%s' % e.message)
node = _get_node(lb, node_id, address, port)
result = rax_clb_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
mutable = {
'condition': condition,
'type': typ,
'weight': weight,
}
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)
# import module snippets
from ansible.module_utils.basic import *
from ansible.module_utils.rax import *
### invoke the module
main()
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