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community.general/library/cloud/gce_lb
Eric Johnson 81b5c93c78 address a few review comments
2013-10-13 13:41:55 -07:00

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#!/usr/bin/python
# Copyright 2013 Google Inc.
#
# 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: gce_lb
short_description: create/destroy GCE load-balancer resources
description:
- This module can create and destroy Google Compute Engine C(loadbalancer)
and C(httphealthcheck) resources. The primary LB resource is the
C(load_balancer) resource and the health check parameters are all
prefixed with I(httphealthcheck).
The full documentation for Google Compute Engine load balancing is at
U(https://developers.google.com/compute/docs/load-balancing/). However,
the ansible module simplifies the configuration by following the
libcloud model.
Full install/configuration instructions for the gce* modules can
be found in the comments of ansible/test/gce_tests.py.
options:
httphealthcheck_name:
description:
- the name identifier for the HTTP health check
required: false
default: null
httphealthcheck_port:
description:
- the TCP port to use for HTTP health checking
required: false
default: 80
httphealthcheck_path:
description:
- the url path to use for HTTP health checking
required: false
default: "/"
httphealthcheck_interval:
description:
- the duration in seconds between each health check request
required: false
default: 5
httphealthcheck_timeout:
description:
- the timeout in seconds before a request is considered a failed check
required: false
default: 5
httphealthcheck_unhealthy_count:
description:
- number of consecutive failed checks before marking a node unhealthy
required: false
default: 2
httphealthcheck_healthy_count:
description:
- number of consecutive successful checks before marking a node healthy
required: false
default: 2
httphealthcheck_host:
description:
- host header to pass through on HTTP check requests
required: false
default: null
name:
description:
- name of the load-balancer resource
required: false
default: null
protocol:
description:
- the protocol used for the load-balancer packet forwarding, tcp or udp
required: false
default: "tcp"
choices: ['tcp', 'udp']
region:
description:
- the GCE region where the load-balancer is defined
required: false
choices: ["us-central1", "us-central2", "europe-west1"]
external_ip:
description:
- the external static IPv4 (or auto-assigned) address for the LB
required: false
default: null
port_range:
description:
- the port (range) to forward, e.g. 80 or 8000-8888 defaults to all ports
required: false
default: null
members:
description:
- a list of zone/nodename pairs, e.g ['us-central1-a/www-a', ...]
required: false
aliases: ['nodes']
state:
description:
- desired state of the LB
default: "present"
choices: ["active", "present", "absent", "deleted"]
aliases: []
requirements: [ "libcloud" ]
author: Eric Johnson <erjohnso@google.com>
'''
EXAMPLES = '''
# Simple example of creating a new LB, adding members, and a health check
- local_action:
module: gce_lb
name: testlb
region: us-central1
members: ["us-central1-a/www-a", "us-central1-b/www-b"]
httphealthcheck_name: hc
httphealthcheck_port: 80
httphealthcheck_path: "/up"
'''
import sys
USER_AGENT_PRODUCT="Ansible-gce_lb"
USER_AGENT_VERSION="v1beta15"
try:
from libcloud.compute.types import Provider
from libcloud.compute.providers import get_driver
from libcloud.loadbalancer.types import Provider as Provider_lb
from libcloud.loadbalancer.providers import get_driver as get_driver_lb
from libcloud.common.google import GoogleBaseError, QuotaExceededError, \
ResourceExistsError, ResourceNotFoundError
_ = Provider.GCE
except ImportError:
print("failed=True " + \
"msg='libcloud with GCE support required for this module.'")
sys.exit(1)
# Load in the libcloud secrets file
try:
import secrets
except ImportError:
secrets = None
ARGS = getattr(secrets, 'GCE_PARAMS', ())
KWARGS = getattr(secrets, 'GCE_KEYWORD_PARAMS', {})
if not ARGS or not KWARGS.has_key('project'):
print("failed=True msg='Missing GCE connection " + \
"parameters in libcloud secrets file.'")
sys.exit(1)
def unexpected_error_msg(error):
"""Format error string based on passed in error."""
msg='Unexpected response: HTTP return_code['
msg+='%s], API error code[%s] and message: %s' % (
error.http_code, error.code, str(error.value))
return msg
def main():
module = AnsibleModule(
argument_spec = dict(
httphealthcheck_name = dict(),
httphealthcheck_port = dict(default=80),
httphealthcheck_path = dict(default='/'),
httphealthcheck_interval = dict(default=5),
httphealthcheck_timeout = dict(default=5),
httphealthcheck_unhealthy_count = dict(default=2),
httphealthcheck_healthy_count = dict(default=2),
httphealthcheck_host = dict(),
name = dict(),
protocol = dict(default='tcp'),
region = dict(),
external_ip = dict(),
port_range = dict(),
members = dict(type='list'),
state = dict(default='present'),
)
)
httphealthcheck_name = module.params.get('httphealthcheck_name')
httphealthcheck_port = module.params.get('httphealthcheck_port')
httphealthcheck_path = module.params.get('httphealthcheck_path')
httphealthcheck_interval = module.params.get('httphealthcheck_interval')
httphealthcheck_timeout = module.params.get('httphealthcheck_timeout')
httphealthcheck_unhealthy_count = \
module.params.get('httphealthcheck_unhealthy_count')
httphealthcheck_healthy_count = \
module.params.get('httphealthcheck_healthy_count')
httphealthcheck_host = module.params.get('httphealthcheck_host')
name = module.params.get('name')
protocol = module.params.get('protocol')
region = module.params.get('region')
external_ip = module.params.get('external_ip')
port_range = module.params.get('port_range')
members = module.params.get('members')
state = module.params.get('state')
try:
gce = get_driver(Provider.GCE)(*ARGS, **KWARGS)
gce.connection.user_agent_append("%s/%s" % (
USER_AGENT_PRODUCT, USER_AGENT_VERSION))
gcelb = get_driver_lb(Provider_lb.GCE)(gce_driver=gce)
gcelb.connection.user_agent_append("%s/%s" % (
USER_AGENT_PRODUCT, USER_AGENT_VERSION))
except Exception as e:
module.fail_json(msg=unexpected_error_msg(e), changed=False)
changed = False
json_output = {'name': name, 'state': state}
if not name and not httphealthcheck_name:
module.fail_json(msg='Nothing to do, please specify a "name" ' + \
'or "httphealthcheck_name" parameter', changed=False)
if state in ['active', 'present']:
# first, create the httphealthcheck if requested
hc = None
if httphealthcheck_name:
json_output['httphealthcheck_name'] = httphealthcheck_name
try:
hc = gcelb.ex_create_healthcheck(httphealthcheck_name,
host=httphealthcheck_host, path=httphealthcheck_path,
port=httphealthcheck_port,
interval=httphealthcheck_interval,
timeout=httphealthcheck_timeout,
unhealthy_threshold=httphealthcheck_unhealthy_count,
healthy_threshold=httphealthcheck_healthy_count)
changed = True
except ResourceExistsError:
hc = gce.ex_get_healthcheck(httphealthcheck_name)
except Exception as e:
module.fail_json(msg=unexpected_error_msg(e), changed=False)
if hc is not None:
json_output['httphealthcheck_host'] = hc.extra['host']
json_output['httphealthcheck_path'] = hc.path
json_output['httphealthcheck_port'] = hc.port
json_output['httphealthcheck_interval'] = hc.interval
json_output['httphealthcheck_timeout'] = hc.timeout
json_output['httphealthcheck_unhealthy_count'] = \
hc.unhealthy_threshold
json_output['httphealthcheck_healthy_count'] = \
hc.healthy_threshold
# create the forwarding rule (and target pool under the hood)
lb = None
if name:
if not region:
module.fail_json(msg='Missing required region name',
changed=False)
nodes = []
output_nodes = []
json_output['name'] = name
# members is a python list of 'zone/inst' strings
if members:
for node in members:
try:
zone, node_name = node.split('/')
nodes.append(gce.ex_get_node(node_name, zone))
output_nodes.append(node)
except:
# skip nodes that are badly formatted or don't exist
pass
try:
if hc is not None:
lb = gcelb.create_balancer(name, port_range, protocol,
None, nodes, ex_region=region, ex_healthchecks=[hc],
ex_address=external_ip)
else:
lb = gcelb.create_balancer(name, port_range, protocol,
None, nodes, ex_region=region, ex_address=external_ip)
changed = True
except ResourceExistsError:
lb = gcelb.get_balancer(name)
except Exception as e:
module.fail_json(msg=unexpected_error_msg(e), changed=False)
if lb is not None:
json_output['members'] = output_nodes
json_output['protocol'] = protocol
json_output['region'] = region
json_output['external_ip'] = lb.ip
json_output['port_range'] = lb.port
hc_names = []
if lb.extra.has_key('healthchecks'):
for hc in lb.extra['healthchecks']:
hc_names.append(hc.name)
json_output['httphealthchecks'] = hc_names
if state in ['absent', 'deleted']:
# first, delete the load balancer (forwarding rule and target pool)
# if specified.
if name:
json_output['name'] = name
try:
lb = gcelb.get_balancer(name)
gcelb.destroy_balancer(lb)
changed = True
except ResourceNotFoundError:
pass
except Exception as e:
module.fail_json(msg=unexpected_error_msg(e), changed=False)
# destroy the health check if specified
if httphealthcheck_name:
json_output['httphealthcheck_name'] = httphealthcheck_name
try:
hc = gce.ex_get_healthcheck(httphealthcheck_name)
gce.ex_destroy_healthcheck(hc)
changed = True
except ResourceNotFoundError:
pass
except Exception as e:
module.fail_json(msg=unexpected_error_msg(e), changed=False)
json_output['changed'] = changed
print json.dumps(json_output)
sys.exit(0)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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