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Add ec2_elb_lb for managing ELBs

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Jim Dalton 2013-09-20 10:53:10 -07:00
parent 98cfcec5e2
commit 38431adf06
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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: ec2_elb_lb
short_description: Creates or destroys Amazon ELB.
- Returns information about the load balancer.
- Will be marked changed when called only if state is changed.
version_added: "1.4"
requirements: [ "boto" ]
author: Jim Dalton
options:
state:
description:
- Create or destroy the ELB
required: true
name:
description:
- The name of the ELB
required: true
listeners:
description:
- List of ports/protocols for this ELB to listen on (see example)
required: false
purge_listeners:
description:
- Purge existing listeners on ELB that are not found in listeners
required: false
default: true
zones:
description:
- List of availability zones to enable on this ELB
required: false
purge_zones:
description:
- Purge existing availability zones on ELB that are not found in zones
required: false
default: False
aws_secret_key:
description:
- AWS secret key. If not set then the value of the AWS_SECRET_KEY environment variable is used.
required: false
default: None
aliases: ['ec2_secret_key', 'secret_key']
aws_access_key:
description:
- AWS access key. If not set then the value of the AWS_ACCESS_KEY environment variable is used.
required: false
default: None
aliases: ['ec2_access_key', 'access_key']
region:
description:
- The AWS region to use. If not specified then the value of the EC2_REGION environment variable, if any, is used.
required: false
aliases: ['aws_region', 'ec2_region']
"""
EXAMPLES = """
# Note: None of these examples set aws_access_key, aws_secret_key, or region.
# It is assumed that their matching environment variables are set.
# Basic provisioning example
- local_action:
module: ec2_elb_lb
name: "test-please-delete"
state: present
zones:
- us-east-1a
- us-east-1d
listeners:
- protocol: http
load_balancer_port: 80
instance_port: 80
- protocol: https
load_balancer_port: 443
instance_protocol: http
instance_port: 80
ssl_certificate_id: "arn:aws:iam::123456789012:server-certificate/company/servercerts/ProdServerCert"
# Ensure ELB is gone
- local_action:
module: ec2_elb_lb
name: "test-please-delete"
state: absent
# Normally, this module will purge any listeners that exist on the ELB
# but aren't specified in the listeners parameter. If purge_listeners is
# false it leaves them alone
- local_action:
module: ec2_elb_lb
name: "test-please-delete"
state: present
zones:
- us-east-1a
- us-east-1d
listeners:
- protocol: http
load_balancer_port: 80
instance_port: 80
purge_listeners: no
# Normally, this module will leave availability zones that are enabled
# on the ELB alone. If purge_zones is true, then any extreneous zones
# will be removed
- local_action:
module: ec2_elb_lb
name: "test-please-delete"
state: present
zones:
- us-east-1a
- us-east-1d
listeners:
- protocol: http
load_balancer_port: 80
instance_port: 80
purge_zones: yes
"""
import sys
import os
AWS_REGIONS = ['ap-northeast-1',
'ap-southeast-1',
'ap-southeast-2',
'eu-west-1',
'sa-east-1',
'us-east-1',
'us-west-1',
'us-west-2']
try:
import boto
import boto.ec2.elb
from boto.regioninfo import RegionInfo
except ImportError:
print "failed=True msg='boto required for this module'"
sys.exit(1)
class ElbManager(object):
"""Handles ELB creation and destruction"""
def __init__(self, module, name, listeners=None, purge_listeners=None,
zones=None, purge_zones=None, aws_access_key=None,
aws_secret_key=None, region=None):
self.module = module
self.name = name
self.listeners = listeners
self.purge_listeners = purge_listeners
self.zones = zones
self.purge_zones = purge_zones
self.aws_access_key = aws_access_key
self.aws_secret_key = aws_secret_key
self.region = region
self.changed = False
self.status = 'gone'
self.elb_conn = self._get_elb_connection()
self.elb = self._get_elb()
def ensure_ok(self):
"""Create the ELB"""
if not self.elb:
# Zones and listeners will be added at creation
self._create_elb()
else:
self._set_zones()
self._set_elb_listeners()
def ensure_gone(self):
"""Destroy the ELB"""
if self.elb:
self._delete_elb()
def get_info(self):
if not self.elb:
info = {
'name': self.name,
'status': self.status
}
else:
info = {
'name': self.elb.name,
'dns_name': self.elb.dns_name,
'zones': self.elb.availability_zones,
'status': self.status
}
if self.elb.listeners:
info['listeners'] = [l.get_complex_tuple()
for l in self.elb.listeners]
elif self.status == 'created':
# When creating a new ELB, listeners don't show in the
# immediately returned result, so just include the
# ones that were added
info['listeners'] = [self._listener_as_tuple(l)
for l in self.listeners]
else:
info['listeners'] = []
return info
def _get_elb(self):
elbs = self.elb_conn.get_all_load_balancers()
for elb in elbs:
if self.name == elb.name:
self.status = 'ok'
return elb
def _get_elb_connection(self):
try:
endpoint = "elasticloadbalancing.%s.amazonaws.com" % self.region
connect_region = RegionInfo(name=self.region, endpoint=endpoint)
return boto.ec2.elb.ELBConnection(self.aws_access_key,
self.aws_secret_key,
region=connect_region)
except boto.exception.NoAuthHandlerFound, e:
self.module.fail_json(msg=str(e))
def _delete_elb(self):
# True if succeeds, exception raised if not
result = self.elb_conn.delete_load_balancer(name=self.name)
if result:
self.changed = True
self.status = 'deleted'
def _create_elb(self):
listeners = [self._listener_as_tuple(l) for l in self.listeners]
self.elb = self.elb_conn.create_load_balancer(name=self.name,
zones=self.zones,
complex_listeners=listeners)
if self.elb:
self.changed = True
self.status = 'created'
def _create_elb_listeners(self, listeners):
"""Takes a list of listener tuples and creates them"""
# True if succeeds, exception raised if not
self.changed = self.elb_conn.create_load_balancer_listeners(self.name,
complex_listeners=listeners)
def _delete_elb_listeners(self, listeners):
"""Takes a list of listener tuples and deletes them from the elb"""
ports = [l[0] for l in listeners]
# True if succeeds, exception raised if not
self.changed = self.elb_conn.delete_load_balancer_listeners(self.name,
ports)
def _set_elb_listeners(self):
"""
Creates listeners specified by self.listeners; overwrites existing
listeners on these ports; removes extraneous listeners
"""
listeners_to_add = []
listeners_to_remove = []
listeners_to_keep = []
# Check for any listeners we need to create or overwrite
for listener in self.listeners:
listener_as_tuple = self._listener_as_tuple(listener)
# First we loop through existing listeners to see if one is
# already specified for this port
existing_listener_found = None
for existing_listener in self.elb.listeners:
# Since ELB allows only one listener on each incoming port, a
# single match on the incomping port is all we're looking for
if existing_listener[0] == listener['load_balancer_port']:
existing_listener_found = existing_listener.get_complex_tuple()
break
if existing_listener_found:
# Does it match exactly?
if listener_as_tuple != existing_listener_found:
# The ports are the same but something else is different,
# so we'll remove the exsiting one and add the new one
listeners_to_remove.append(existing_listener_found)
listeners_to_add.append(listener_as_tuple)
else:
# We already have this listener, so we're going to keep it
listeners_to_keep.append(existing_listener_found)
else:
# We didn't find an existing listener, so just add the new one
listeners_to_add.append(listener_as_tuple)
# Check for any extraneous listeners we need to remove, if desired
if self.purge_listeners:
for existing_listener in self.elb.listeners:
existing_listener_tuple = existing_listener.get_complex_tuple()
if existing_listener_tuple in listeners_to_remove:
# Already queued for removal
continue
if existing_listener_tuple in listeners_to_keep:
# Keep this one around
continue
# Since we're not already removing it and we don't need to keep
# it, let's get rid of it
listeners_to_remove.append(existing_listener_tuple)
if listeners_to_remove:
self._delete_elb_listeners(listeners_to_remove)
if listeners_to_add:
self._create_elb_listeners(listeners_to_add)
def _listener_as_tuple(self, listener):
"""Formats listener as a 4- or 5-tuples, in the order specified by the
ELB API"""
# N.B. string manipulations on protocols below (str(), upper()) is to
# ensure format matches output from ELB API
listener_list = [
listener['load_balancer_port'],
listener['instance_port'],
str(listener['protocol'].upper()),
]
# Instance protocol is not required by ELB API; it defaults to match
# load balancer protocol. We'll mimic that behavior here
if 'instance_protocol' in listener:
listener_list.append(str(listener['instance_protocol'].upper()))
else:
listener_list.append(str(listener['protocol'].upper()))
if 'ssl_certificate_id' in listener:
listener_list.append(str(listener['ssl_certificate_id']))
return tuple(listener_list)
def _enable_zones(self, zones):
self.elb_conn.enable_availability_zones(self.name, zones)
self.changed = True
def _disable_zones(self, zones):
self.elb_conn.disable_availability_zones(self.name, zones)
self.changed = True
def _set_zones(self):
"""Determine which zones need to be enabled or disabled on the ELB"""
if self.purge_zones:
zones_to_disable = list(set(self.elb.availability_zones) -
set(self.zones))
zones_to_enable = list(set(self.zones) -
set(self.elb.availability_zones))
else:
zones_to_disable = None
zones_to_enable = list(set(self.zones) -
set(self.elb.availability_zones))
if zones_to_enable:
self._enable_zones(zones_to_enable)
# N.B. This must come second, in case it would have removed all zones
if zones_to_disable:
self._disable_zones(zones_to_disable)
def main():
module = AnsibleModule(
argument_spec=dict(
state={'required': True, 'choices': ['present', 'absent']},
name={'required': True},
listeners={'default': None, 'required': False, 'type': 'list'},
purge_listeners={'default': True, 'required': False,
'choices': BOOLEANS, 'type': 'bool'},
zones={'default': None, 'required': False, 'type': 'list'},
purge_zones={'default': False, 'required': False,
'choices': BOOLEANS, 'type': 'bool'},
aws_secret_key={'default': None,
'aliases': ['ec2_secret_key', 'secret_key'],
'no_log': True},
aws_access_key={'default': None,
'aliases': ['ec2_access_key', 'access_key']},
region={'default': None, 'required': False,
'aliases': ['aws_region', 'ec2_region'],
'choices': AWS_REGIONS},
)
)
aws_secret_key = module.params['aws_secret_key']
aws_access_key = module.params['aws_access_key']
region = module.params['region']
name = module.params['name']
state = module.params['state']
listeners = module.params['listeners']
purge_listeners = module.params['purge_listeners']
zones = module.params['zones']
purge_zones = module.params['purge_zones']
if state == 'present' and not listeners:
module.fail_json(msg="At least one port is required for ELB creation")
if state == 'present' and not zones:
module.fail_json(msg="At least one availability zone is required for ELB creation")
if not aws_secret_key:
if 'AWS_SECRET_KEY' in os.environ:
aws_secret_key = os.environ['AWS_SECRET_KEY']
elif 'EC2_SECRET_KEY' in os.environ:
aws_secret_key = os.environ['EC2_SECRET_KEY']
if not aws_access_key:
if 'AWS_ACCESS_KEY' in os.environ:
aws_access_key = os.environ['AWS_ACCESS_KEY']
elif 'EC2_ACCESS_KEY' in os.environ:
aws_access_key = os.environ['EC2_ACCESS_KEY']
if not region:
if 'AWS_REGION' in os.environ:
region = os.environ['AWS_REGION']
elif 'EC2_REGION' in os.environ:
region = os.environ['EC2_REGION']
if not region:
module.fail_json(msg=str("Either region or EC2_REGION environment variable must be set."))
elb_man = ElbManager(module, name, listeners, purge_listeners, zones,
purge_zones, aws_access_key, aws_secret_key,
region=region)
if state == 'present':
elb_man.ensure_ok()
elif state == 'absent':
elb_man.ensure_gone()
ansible_facts = {'ec2_elb': 'info'}
ec2_facts_result = dict(changed=elb_man.changed,
elb=elb_man.get_info(),
ansible_facts=ansible_facts)
module.exit_json(**ec2_facts_result)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()