ansible/library/cloud/cloudformation

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#!/usr/bin/python
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# 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: cloudformation
short_description: create a AWS CloudFormation stack
description:
- Launches an AWS CloudFormation stack and waits for it complete.
version_added: "1.1"
options:
stack_name:
description:
- name of the cloudformation stack
required: true
default: null
aliases: []
disable_rollback:
description:
- If a stacks fails to form, rollback will remove the stack
required: false
default: "no"
choices: [ "yes", "no" ]
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aliases: []
template_parameters:
description:
- a list of hashes of all the template variables for the stack
required: true
default: null
aliases: []
region:
description:
- The AWS region to use. If not specified then the value of the EC2_REGION environment variable, if any, is used.
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required: true
default: null
aliases: ['aws_region', 'ec2_region']
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state:
description:
- If state is "present", stack will be created. If state is "present" and if stack exists and template has changed, it will be updated.
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If state is absent, stack will be removed.
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required: true
default: null
aliases: []
template:
description:
- the path of the cloudformation template
required: true
default: null
aliases: []
requirements: [ "boto" ]
author: James S. Martin
'''
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EXAMPLES = '''
# Basic task example
tasks:
- name: launch ansible cloudformation example
action: cloudformation >
stack_name="ansible-cloudformation" state=present
region=us-east-1 disable_rollback=yes
template=files/cloudformation-example.json
args:
template_parameters:
KeyName: jmartin
DiskType: ephemeral
InstanceType: m1.small
ClusterSize: 3
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'''
import json
import time
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try:
import boto.cloudformation.connection
except ImportError:
print "failed=True msg='boto required for this module'"
sys.exit(1)
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']
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class Region:
def __init__(self, region):
'''connects boto to the region specified in the cloudformation template'''
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self.name = region
self.endpoint = 'cloudformation.%s.amazonaws.com' % region
def boto_exception(err):
'''generic error message handler'''
if hasattr(err, 'error_message'):
error = err.error_message
elif hasattr(err, 'message'):
error = err.message
else:
error = '%s: %s' % (Exception, err)
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return error
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def stack_operation(cfn, stack_name, operation):
'''gets the status of a stack while it is created/updated/deleted'''
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existed = []
result = {}
operation_complete = False
while operation_complete == False:
try:
stack = cfn.describe_stacks(stack_name)[0]
existed.append('yes')
except:
if 'yes' in existed:
result = dict(changed=True,
output='Stack Deleted',
events=map(str, list(stack.describe_events())))
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else:
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result = dict(changed= True, output='Stack Not Found')
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break
if '%s_COMPLETE' % operation == stack.stack_status:
result = dict(changed=True,
events = map(str, list(stack.describe_events())),
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output = 'Stack %s complete' % operation)
break
if '%s_ROLLBACK_COMPLETE' % operation == stack.stack_status:
result = dict(changed=True,
events = map(str, list(stack.describe_events())),
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output = 'Problem with %s. Rollback complete' % operation)
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break
elif '%s_FAILED' % operation == stack.stack_status:
result = dict(changed=False,
events = map(str, list(stack.describe_events())),
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output = 'Stack %s failed' % operation)
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break
else:
time.sleep(5)
return result
def main():
module = AnsibleModule(
argument_spec=dict(
stack_name=dict(required=True),
template_parameters=dict(required=True),
region=dict(aliases=['aws_region', 'ec2_region'], required=True, choices=AWS_REGIONS),
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state=dict(default='present', choices=['present', 'absent']),
template=dict(default=None, required=True),
disable_rollback=dict(default=False)
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)
)
state = module.params['state']
stack_name = module.params['stack_name']
r = module.params['region']
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template_body = open(module.params['template'], 'r').read()
disable_rollback = module.params['disable_rollback']
template_parameters = module.params['template_parameters']
if not r:
if 'AWS_REGION' in os.environ:
r = os.environ['AWS_REGION']
elif 'EC2_REGION' in os.environ:
r = os.environ['EC2_REGION']
# convert the template parameters ansible passes into a tuple for boto
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template_parameters_tup = [(k, v) for k, v in template_parameters.items()]
stack_outputs = {}
try:
region = Region(r)
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cfn = boto.cloudformation.connection.CloudFormationConnection(
region=region)
except boto.exception.NoAuthHandlerFound, e:
module.fail_json(msg=str(e))
update = False
result = {}
operation = None
# if state is present we are going to ensure that the stack is either
# created or updated
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if state == 'present':
try:
cfn.create_stack(stack_name, parameters=template_parameters_tup,
template_body=template_body,
disable_rollback=disable_rollback,
capabilities=['CAPABILITY_IAM'])
operation = 'CREATE'
except Exception, err:
error_msg = boto_exception(err)
if 'AlreadyExistsException' in error_msg:
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update = True
else:
module.fail_json(msg=error_msg)
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if not update:
result = stack_operation(cfn, stack_name, operation)
# if the state is present and the stack already exists, we try to update it
# AWS will tell us if the stack template and parameters are the same and
# don't need to be updated.
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if update:
try:
cfn.update_stack(stack_name, parameters=template_parameters_tup,
template_body=template_body,
disable_rollback=disable_rollback,
capabilities=['CAPABILITY_IAM'])
operation = 'UPDATE'
except Exception, err:
error_msg = boto_exception(err)
if 'No updates are to be performed.' in error_msg:
result = dict(changed=False, output='Stack is already up-to-date.')
else:
module.fail_json(msg=error_msg)
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if operation == 'UPDATE':
result = stack_operation(cfn, stack_name, operation)
# check the status of the stack while we are creating/updating it.
# and get the outputs of the stack
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if state == 'present' or update:
stack = cfn.describe_stacks(stack_name)[0]
for output in stack.outputs:
stack_outputs[output.key] = output.value
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result['stack_outputs'] = stack_outputs
# absent state is different because of the way delete_stack works.
# problem is it it doesn't give an error if stack isn't found
# so must describe the stack first
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if state == 'absent':
try:
cfn.describe_stacks(stack_name)
operation = 'DELETE'
except Exception, err:
error_msg = boto_exception(err)
if 'Stack:%s does not exist' % stack_name in error_msg:
result = dict(changed=False, output='Stack not found.')
else:
module.fail_json(msg=error_msg)
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if operation == 'DELETE':
cfn.delete_stack(stack_name)
result = stack_operation(cfn, stack_name, operation)
module.exit_json(**result)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()