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bigip_pool.py
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bigip_pool.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 F5 Networks Inc.
# GNU General Public License v3.0 (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
ANSIBLE_METADATA = {'metadata_version': '1.1',
'status': ['preview'],
'supported_by': 'community'}
DOCUMENTATION = r'''
---
module: bigip_pool
short_description: Manages F5 BIG-IP LTM pools
description:
- Manages F5 BIG-IP LTM pools via iControl REST API.
version_added: 1.2
options:
description:
description:
- Specifies descriptive text that identifies the pool.
version_added: "2.3"
name:
description:
- Pool name
required: True
aliases:
- pool
lb_method:
description:
- Load balancing method. When creating a new pool, if this value is not
specified, the default of C(round-robin) will be used.
version_added: "1.3"
choices:
- dynamic-ratio-member
- dynamic-ratio-node
- fastest-app-response
- fastest-node
- least-connections-member
- least-connections-node
- least-sessions
- observed-member
- observed-node
- predictive-member
- predictive-node
- ratio-least-connections-member
- ratio-least-connections-node
- ratio-member
- ratio-node
- ratio-session
- round-robin
- weighted-least-connections-member
- weighted-least-connections-nod
monitor_type:
description:
- Monitor rule type when C(monitors) is specified. When creating a new
pool, if this value is not specified, the default of 'and_list' will
be used.
- Both C(single) and C(and_list) are functionally identical since BIG-IP
considers all monitors as "a list". BIG=IP either has a list of many,
or it has a list of one. Where they differ is in the extra guards that
C(single) provides; namely that it only allows a single monitor.
version_added: "1.3"
choices: ['and_list', 'm_of_n', 'single']
quorum:
description:
- Monitor quorum value when C(monitor_type) is C(m_of_n).
version_added: "1.3"
monitors:
description:
- Monitor template name list. If the partition is not provided as part of
the monitor name, then the C(partition) option will be used instead.
version_added: "1.3"
slow_ramp_time:
description:
- Sets the ramp-up time (in seconds) to gradually ramp up the load on
newly added or freshly detected up pool members.
version_added: "1.3"
reselect_tries:
description:
- Sets the number of times the system tries to contact a pool member
after a passive failure.
version_added: "2.2"
service_down_action:
description:
- Sets the action to take when node goes down in pool.
version_added: "1.3"
choices:
- none
- reset
- drop
- reselect
host:
description:
- Pool member IP.
deprecated: Deprecated in 2.4. Use the C(bigip_pool_member) module instead.
aliases:
- address
port:
description:
- Pool member port.
deprecated: Deprecated in 2.4. Use the C(bigip_pool_member) module instead.
partition:
description:
- Device partition to manage resources on.
default: Common
version_added: 2.5
notes:
- Requires BIG-IP software version >= 11.
- F5 developed module 'F5-SDK' required (https://github.com/F5Networks/f5-common-python).
- Best run as a local_action in your playbook.
requirements:
- f5-sdk
extends_documentation_fragment: f5
author:
- Tim Rupp (@caphrim007)
- Wojciech Wypior (@wojtek0806)
'''
EXAMPLES = r'''
- name: Create pool
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: present
name: my-pool
partition: Common
lb_method: least_connection_member
slow_ramp_time: 120
delegate_to: localhost
- name: Modify load balancer method
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: present
name: my-pool
partition: Common
lb_method: round_robin
delegate_to: localhost
- name: Add pool member
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: present
name: my-pool
partition: Common
host: "{{ ansible_default_ipv4['address'] }}"
port: 80
delegate_to: localhost
- name: Set a single monitor (with enforcement)
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: present
name: my-pool
partition: Common
monitor_type: single
monitors:
- http
delegate_to: localhost
- name: Set a single monitor (without enforcement)
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: present
name: my-pool
partition: Common
monitors:
- http
delegate_to: localhost
- name: Set multiple monitors (all must succeed)
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: present
name: my-pool
partition: Common
monitor_type: and_list
monitors:
- http
- tcp
delegate_to: localhost
- name: Set multiple monitors (at least 1 must succeed)
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: present
name: my-pool
partition: Common
monitor_type: m_of_n
quorum: 1
monitors:
- http
- tcp
delegate_to: localhost
- name: Remove pool member from pool
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: absent
name: my-pool
partition: Common
host: "{{ ansible_default_ipv4['address'] }}"
port: 80
delegate_to: localhost
- name: Delete pool
bigip_pool:
server: lb.mydomain.com
user: admin
password: secret
state: absent
name: my-pool
partition: Common
delegate_to: localhost
'''
RETURN = r'''
monitor_type:
description: The contact that was set on the datacenter.
returned: changed
type: string
sample: admin@root.local
quorum:
description: The quorum that was set on the pool.
returned: changed
type: int
sample: 2
monitors:
description: Monitors set on the pool.
returned: changed
type: list
sample: ['/Common/http', '/Common/gateway_icmp']
service_down_action:
description: Service down action that is set on the pool.
returned: changed
type: string
sample: reset
description:
description: Description set on the pool.
returned: changed
type: string
sample: Pool of web servers
lb_method:
description: The LB method set for the pool.
returned: changed
type: string
sample: round-robin
host:
description: IP of pool member included in pool.
returned: changed
type: string
sample: 10.10.10.10
port:
description: Port of pool member included in pool.
returned: changed
type: int
sample: 80
slow_ramp_time:
description: The new value that is set for the slow ramp-up time.
returned: changed
type: int
sample: 500
reselect_tries:
description: The new value that is set for the number of tries to contact member.
returned: changed
type: int
sample: 10
'''
import re
import os
from ansible.module_utils.f5_utils import AnsibleF5Client
from ansible.module_utils.f5_utils import AnsibleF5Parameters
from ansible.module_utils.f5_utils import HAS_F5SDK
from ansible.module_utils.f5_utils import F5ModuleError
from ansible.module_utils.f5_utils import iControlUnexpectedHTTPError
from ansible.module_utils.f5_utils import defaultdict
from ansible.module_utils.f5_utils import iteritems
from netaddr import IPAddress, AddrFormatError
class Parameters(AnsibleF5Parameters):
api_map = {
'loadBalancingMode': 'lb_method',
'slowRampTime': 'slow_ramp_time',
'reselectTries': 'reselect_tries',
'serviceDownAction': 'service_down_action',
'monitor': 'monitors'
}
api_attributes = [
'description', 'name', 'loadBalancingMode', 'monitor', 'slowRampTime',
'reselectTries', 'serviceDownAction'
]
returnables = [
'monitor_type', 'quorum', 'monitors', 'service_down_action',
'description', 'lb_method', 'host', 'port', 'slow_ramp_time',
'reselect_tries', 'monitor', 'member_name', 'name', 'partition'
]
updatables = [
'monitor_type', 'quorum', 'monitors', 'service_down_action',
'description', 'lb_method', 'slow_ramp_time', 'reselect_tries',
'host', 'port'
]
def __init__(self, params=None):
self._values = defaultdict(lambda: None)
if params:
self.update(params=params)
self._values['__warnings'] = []
def update(self, params=None):
if params:
for k, v in iteritems(params):
if self.api_map is not None and k in self.api_map:
map_key = self.api_map[k]
else:
map_key = k
# Handle weird API parameters like `dns.proxy.__iter__` by
# using a map provided by the module developer
class_attr = getattr(type(self), map_key, None)
if isinstance(class_attr, property):
# There is a mapped value for the api_map key
if class_attr.fset is None:
# If the mapped value does not have an associated setter
self._values[map_key] = v
else:
# The mapped value has a setter
setattr(self, map_key, v)
else:
# If the mapped value is not a @property
self._values[map_key] = v
@property
def lb_method(self):
lb_map = {
'ratio_node_address': 'ratio-node',
'dynamic_ratio': 'dynamic-ratio-node',
'least_connection_member': 'least-connections-member',
'least_connection_node_address': 'least-connections-node',
'fastest_node_address': 'fastest-node',
'observed_node_address': 'observed-node',
'predictive_node_address': 'predictive-node',
'weighted_least_connection_member': 'weighted-least-connections-member',
'weighted_least_connection_node_address': 'weighted-least-connections-node',
'ratio_least_connection_member': 'ratio-least-connections-member',
'ratio_least_connection_node_address': 'ratio-least-connections-node'
}
lb_method = self._values['lb_method']
if lb_method is None:
return None
spec = ArgumentSpec()
if lb_method in spec.lb_choice_removed:
raise F5ModuleError(
"The provided lb_method is not supported"
)
if lb_method in spec.lb_choice_deprecated:
self._values['__warnings'].append(
dict(
msg="The provided lb_method '{0}' is deprecated".format(lb_method),
version='2.4'
)
)
lb_method = lb_map.get(lb_method, lb_method.replace('_', '-'))
try:
assert lb_method in spec.lb_choice
except AssertionError:
raise F5ModuleError('Provided lb_method is unknown')
return lb_method
def _fqdn_name(self, value):
if value.startswith('/'):
name = os.path.basename(value)
result = '/{0}/{1}'.format(self.partition, name)
else:
result = '/{0}/{1}'.format(self.partition, value)
return result
@property
def monitors_list(self):
if self._values['monitors'] is None:
return []
try:
result = re.findall(r'/\w+/[^\s}]+', self._values['monitors'])
return result
except Exception:
return self._values['monitors']
@property
def monitors(self):
if self._values['monitors'] is None:
return None
monitors = [self._fqdn_name(x) for x in self.monitors_list]
if self.monitor_type == 'm_of_n':
monitors = ' '.join(monitors)
result = 'min %s of { %s }' % (self.quorum, monitors)
else:
result = ' and '.join(monitors).strip()
return result
@property
def quorum(self):
if self.kind == 'tm:ltm:pool:poolstate':
if self._values['monitors'] is None:
return None
pattern = r'min\s+(?P<quorum>\d+)\s+of'
matches = re.search(pattern, self._values['monitors'])
if matches:
quorum = matches.group('quorum')
else:
quorum = None
else:
quorum = self._values['quorum']
try:
if quorum is None:
return None
return int(quorum)
except ValueError:
raise F5ModuleError(
"The specified 'quorum' must be an integer."
)
@property
def monitor_type(self):
if self.kind == 'tm:ltm:pool:poolstate':
if self._values['monitors'] is None:
return None
pattern = r'min\s+\d+\s+of'
matches = re.search(pattern, self._values['monitors'])
if matches:
return 'm_of_n'
else:
return 'and_list'
else:
if self._values['monitor_type'] is None:
return None
return self._values['monitor_type']
@property
def host(self):
value = self._values['host']
if value is None:
return None
msg = "'%s' is not a valid IP address" % value
try:
IPAddress(value)
except AddrFormatError:
raise F5ModuleError(msg)
return value
@host.setter
def host(self, value):
self._values['host'] = value
@property
def port(self):
value = self._values['port']
if value is None:
return None
msg = "The provided port '%s' must be between 0 and 65535" % value
if value < 0 or value > 65535:
raise F5ModuleError(msg)
return value
@port.setter
def port(self, value):
self._values['port'] = value
@property
def member_name(self):
if self.host is None or self.port is None:
return None
mname = str(self.host) + ':' + str(self.port)
return mname
def to_return(self):
result = {}
for returnable in self.returnables:
result[returnable] = getattr(self, returnable)
result = self._filter_params(result)
return result
def api_params(self):
result = {}
for api_attribute in self.api_attributes:
if self.api_map is not None and api_attribute in self.api_map:
result[api_attribute] = getattr(
self, self.api_map[api_attribute]
)
else:
result[api_attribute] = getattr(self, api_attribute)
result = self._filter_params(result)
return result
class Changes(Parameters):
pass
class Difference(object):
def __init__(self, want, have=None):
self.want = want
self.have = have
def compare(self, param):
try:
result = getattr(self, param)
return result
except AttributeError:
return self.__default(param)
def __default(self, param):
attr1 = getattr(self.want, param)
try:
attr2 = getattr(self.have, param)
if attr1 != attr2:
return attr1
except AttributeError:
return attr1
@property
def monitor_type(self):
if self.want.monitor_type is None:
self.want.update(dict(monitor_type=self.have.monitor_type))
if self.want.quorum is None:
self.want.update(dict(quorum=self.have.quorum))
if self.want.monitor_type == 'm_of_n' and self.want.quorum is None:
raise F5ModuleError(
"Quorum value must be specified with monitor_type 'm_of_n'."
)
elif self.want.monitor_type == 'single':
if len(self.want.monitors_list) > 1:
raise F5ModuleError(
"When using a 'monitor_type' of 'single', only one monitor may be provided."
)
elif len(self.have.monitors_list) > 1 and len(self.want.monitors_list) == 0:
# Handle instances where there already exists many monitors, and the
# user runs the module again specifying that the monitor_type should be
# changed to 'single'
raise F5ModuleError(
"A single monitor must be specified if more than one monitor currently exists on your pool."
)
# Update to 'and_list' here because the above checks are all that need
# to be done before we change the value back to what is expected by
# BIG-IP.
#
# Remember that 'single' is nothing more than a fancy way of saying
# "and_list plus some extra checks"
self.want.update(dict(monitor_type='and_list'))
if self.want.monitor_type != self.have.monitor_type:
return self.want.monitor_type
@property
def monitors(self):
if self.want.monitor_type is None:
self.want.update(dict(monitor_type=self.have.monitor_type))
if not self.want.monitors_list:
self.want.monitors = self.have.monitors_list
if not self.want.monitors and self.want.monitor_type is not None:
raise F5ModuleError(
"The 'monitors' parameter cannot be empty when 'monitor_type' parameter is specified"
)
if self.want.monitors != self.have.monitors:
return self.want.monitors
class ModuleManager(object):
def __init__(self, client):
self.client = client
self.have = None
self.want = Parameters(self.client.module.params)
self.changes = Changes()
def exec_module(self):
changed = False
result = dict()
state = self.want.state
try:
if state == "present":
changed = self.present()
elif state == "absent":
changed = self.absent()
except iControlUnexpectedHTTPError as e:
raise F5ModuleError(str(e))
changes = self.changes.to_return()
result.update(**changes)
result.update(dict(changed=changed))
self._announce_deprecations()
return result
def _announce_deprecations(self):
warnings = []
if self.want:
warnings += self.want._values.get('__warnings', [])
if self.have:
warnings += self.have._values.get('__warnings', [])
for warning in warnings:
self.client.module.deprecate(
msg=warning['msg'],
version=warning['version']
)
def _set_changed_options(self):
changed = {}
for key in Parameters.returnables:
if getattr(self.want, key) is not None:
changed[key] = getattr(self.want, key)
if changed:
self.changes = Parameters(changed)
def _update_changed_options(self):
diff = Difference(self.want, self.have)
updatables = Parameters.updatables
changed = dict()
for k in updatables:
change = diff.compare(k)
if change is None:
continue
else:
changed[k] = change
if changed:
self.changes = Parameters(changed)
return True
return False
def _member_does_not_exist(self, members):
name = self.want.member_name
# Return False if name is None, so that we don't attempt to create it
if name is None:
return False
for member in members:
if member.name == name:
host, port = name.split(':')
self.have.host = host
self.have.port = int(port)
return False
return True
def present(self):
if self.exists():
return self.update()
else:
return self.create()
def absent(self):
if self.exists():
return self.remove()
return False
def should_update(self):
result = self._update_changed_options()
if result:
return True
return False
def update(self):
self.have, members, poolres = self.read_current_from_device()
if not self.client.check_mode:
if self._member_does_not_exist(members):
self.create_member_on_device(poolres)
if not self.should_update():
return False
if self.client.check_mode:
return True
self.update_on_device()
return True
def remove(self):
if self.client.check_mode:
return True
self.remove_from_device()
if self.exists():
raise F5ModuleError("Failed to delete the Pool")
return True
def create(self):
if self.want.monitor_type is not None:
if not self.want.monitors_list:
raise F5ModuleError(
"The 'monitors' parameter cannot be empty when 'monitor_type' parameter is specified"
)
else:
if self.want.monitor_type is None:
self.want.update(dict(monitor_type='and_list'))
if self.want.monitor_type == 'm_of_n' and self.want.quorum is None:
raise F5ModuleError(
"Quorum value must be specified with monitor_type 'm_of_n'."
)
elif self.want.monitor_type == 'single' and len(self.want.monitors_list) > 1:
raise F5ModuleError(
"When using a 'monitor_type' of 'single', only one monitor may be provided"
)
self._set_changed_options()
if self.client.check_mode:
return True
self.create_on_device()
if self.want.member_name:
self.have, members, poolres = self.read_current_from_device()
if self._member_does_not_exist(members):
self.create_member_on_device(poolres)
return True
def create_on_device(self):
params = self.want.api_params()
self.client.api.tm.ltm.pools.pool.create(
partition=self.want.partition, **params
)
def create_member_on_device(self, poolres):
poolres.members_s.members.create(
name=self.want.member_name,
partition=self.want.partition
)
def update_on_device(self):
params = self.want.api_params()
result = self.client.api.tm.ltm.pools.pool.load(
name=self.want.name,
partition=self.want.partition
)
result.modify(**params)
def exists(self):
return self.client.api.tm.ltm.pools.pool.exists(
name=self.want.name,
partition=self.want.partition
)
def remove_from_device(self):
result = self.client.api.tm.ltm.pools.pool.load(
name=self.want.name,
partition=self.want.partition
)
if self.want.member_name and self.want.port and self.want.pool:
member = result.members_s.members.load(
name=self.want.member_name,
partition=self.want.partition
)
if member:
member.delete()
self.delete_node_on_device()
else:
result.delete()
def read_current_from_device(self):
tmp_res = self.client.api.tm.ltm.pools.pool.load(
name=self.want.name,
partition=self.want.partition
)
members = tmp_res.members_s.get_collection()
result = tmp_res.attrs
return Parameters(result), members, tmp_res
def delete_node_on_device(self):
resource = self.client.api.tm.ltm.nodes.node.load(
name=self.want.host,
partition=self.want.partition
)
try:
resource.delete()
except iControlUnexpectedHTTPError as e:
# If we cannot remove it, it is in use, it is up to user to delete
# it later.
if "is referenced by a member of pool" in str(e):
return
else:
raise
class ArgumentSpec(object):
def __init__(self):
self.lb_choice_deprecated = [
'round_robin',
'ratio_member',
'least_connection_member',
'observed_member',
'predictive_member',
'ratio_node_address',
'least_connection_node_address',
'fastest_node_address',
'observed_node_address',
'predictive_node_address',
'dynamic_ratio',
'fastest_app_response',
'least_sessions',
'dynamic_ratio_member',
'ratio_session',
'weighted_least_connection_member',
'ratio_least_connection_member',
'weighted_least_connection_node_address',
'ratio_least_connection_node_address'
]
self.lb_choice_removed = [
'l3_addr'
]
self.lb_choice = [
'dynamic-ratio-member',
'dynamic-ratio-node',
'fastest-app-response',
'fastest-node',
'least-connections-member',
'least-connections-node',
'least-sessions',
'observed-member',
'observed-node',
'predictive-member',
'predictive-node',
'ratio-least-connections-member',
'ratio-least-connections-node',
'ratio-member',
'ratio-node',
'ratio-session',
'round-robin',
'weighted-least-connections-member',
'weighted-least-connections-node'
]
lb_choices = self.lb_choice_removed + self.lb_choice + self.lb_choice_deprecated
self.supports_check_mode = True
self.argument_spec = dict(
name=dict(
required=True,
aliases=['pool']
),
lb_method=dict(
choices=lb_choices
),
monitor_type=dict(
choices=[
'and_list', 'm_of_n', 'single'
]
),
quorum=dict(
type='int'
),
monitors=dict(
type='list'
),
slow_ramp_time=dict(
type='int'
),
reselect_tries=dict(
type='int'
),
service_down_action=dict(
choices=[
'none', 'reset',
'drop', 'reselect'
]
),
description=dict(),
host=dict(
aliases=['address'],
removed_in_version='2.4'
),
port=dict(
type='int',
removed_in_version='2.4'
)
)
self.f5_product_name = 'bigip'
def main():
if not HAS_F5SDK:
raise F5ModuleError("The python f5-sdk module is required")
spec = ArgumentSpec()
client = AnsibleF5Client(
argument_spec=spec.argument_spec,
supports_check_mode=spec.supports_check_mode,
f5_product_name=spec.f5_product_name
)
try:
mm = ModuleManager(client)
results = mm.exec_module()
client.module.exit_json(**results)
except F5ModuleError as e:
client.module.fail_json(msg=str(e))
if __name__ == '__main__':
main()