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ansible/cloud/digital_ocean
Ralph Bean 1d0a7baaa1 Add a new unique_name param to the digital_ocean module for idempotence. 
As it stands now, it is difficult to write idempotent tasks for digital
ocean droplets.  Digital ocean assigns new nodes a random id when they
are provisioned and that id is the only key that can be used to identify
it in subsequent runs of that play.

The workflow previously involved manual intervention:

- write a play defining a new node with no specified id
- run it, collect the randomly assigned id by hand
- modify the play to add the id by hand so future runs don't create
  duplicate nodes
- perform future re-runs that check if the node exists (by its id)
  - if it does exist then do nothing.
  - if it does not exist, then create it and return a *new random id*
  - collect the new random id by hand, modify the playbook file, and
    start all over.

Its a huge pain.

The modifications in this commit allow you to use the 'hostname' as a
primary key for idempotence with digital ocean.  By default, digital
ocean will let you create as many hosts with the same hostname as you
like.  Here, we provide an option to constrain the user to using only
unique hostnames.

The workflow will now look like:

- write a play defining a new node with a specified hostname and
  "unique_name: true""
- run it, create the new node and move on.
- re-run it, notice that a node with that hostname is already created
  and move on.
2013-09-18 16:07:22 -04:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# 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: digital_ocean
short_description: Create/delete a droplet/SSH_key in DigitalOcean
description:
- Create/delete a droplet in DigitalOcean and optionally waits for it to be 'running', or deploy an SSH key.
version_added: "1.3"
options:
command:
description:
- Which target you want to operate on.
default: droplet
choices: ['droplet', 'ssh']
state:
description:
- Indicate desired state of the target.
default: present
choices: ['present', 'active', 'absent', 'deleted']
client_id:
description:
- Digital Ocean manager id.
api_key:
description:
- Digital Ocean api key.
id:
description:
- Numeric, the droplet id you want to operate on.
name:
description:
- String, this is the name of the droplet - must be formatted by hostname rules, or the name of a SSH key.
unique_name:
description:
- Bool, require unique hostnames. By default, digital ocean allows multiple hosts with the same name. Setting this to "yes" allows only one host per name. Useful for idempotence.
default: "no"
choices: [ "yes", "no" ]
size_id:
description:
- Numeric, this is the id of the size you would like the droplet created at.
image_id:
description:
- Numeric, this is the id of the image you would like the droplet created with.
region_id:
description:
- "Numeric, this is the id of the region you would like your server"
ssh_key_ids:
description:
- Optional, comma separated list of ssh_key_ids that you would like to be added to the server
wait:
description:
- Wait for the droplet to be in state 'running' before returning. If wait is "no" an ip_address may not be returned.
default: "yes"
choices: [ "yes", "no" ]
wait_timeout:
description:
- How long before wait gives up, in seconds.
default: 300
ssh_pub_key:
description:
- The public SSH key you want to add to your account.
notes:
- Two environment variables can be used, DO_CLIENT_ID and DO_API_KEY.
'''
EXAMPLES = '''
# Ensure a SSH key is present
# If a key matches this name, will return the ssh key id and changed = False
# If no existing key matches this name, a new key is created, the ssh key id is returned and changed = False
- digital_ocean: >
state=present
command=ssh
name=my_ssh_key
ssh_pub_key='ssh-rsa AAAA...'
client_id=XXX
api_key=XXX
# Create a new Droplet
# Will return the droplet details including the droplet id (used for idempotence)
- digital_ocean: >
state=present
command=droplet
name=my_new_droplet
client_id=XXX
api_key=XXX
size_id=1
region_id=2
image_id=3
wait_timeout=500
register: my_droplet
- debug: msg="ID is {{ my_droplet.droplet.id }}"
- debug: msg="IP is {{ my_droplet.droplet.ip_address }}"
# Ensure a droplet is present
# If droplet id already exist, will return the droplet details and changed = False
# If no droplet matches the id, a new droplet will be created and the droplet details (including the new id) are returned, changed = True.
- digital_ocean: >
state=present
command=droplet
id=123
name=my_new_droplet
client_id=XXX
api_key=XXX
size_id=1
region_id=2
image_id=3
wait_timeout=500
# Create a droplet with ssh key
# The ssh key id can be passed as argument at the creation of a droplet (see ssh_key_ids).
# Several keys can be added to ssh_key_ids as id1,id2,id3
# The keys are used to connect as root to the droplet.
- digital_ocean: >
state=present
ssh_key_ids=id1,id2
name=my_new_droplet
client_id=XXX
api_key=XXX
size_id=1
region_id=2
image_id=3
'''
import sys
import os
import time
try:
from dopy.manager import DoError, DoManager
except ImportError as e:
print "failed=True msg='dopy required for this module'"
sys.exit(1)
class TimeoutError(DoError):
def __init__(self, msg, id):
super(TimeoutError, self).__init__(msg)
self.id = id
class JsonfyMixIn(object):
def to_json(self):
return self.__dict__
class Droplet(JsonfyMixIn):
manager = None
def __init__(self, droplet_json):
self.status = 'new'
self.__dict__.update(droplet_json)
def is_powered_on(self):
return self.status == 'active'
def update_attr(self, attrs=None):
if attrs:
for k, v in attrs.iteritems():
setattr(self, k, v)
else:
json = self.manager.show_droplet(self.id)
if json['ip_address']:
self.update_attr(json)
def power_on(self):
assert self.status == 'off', 'Can only power on a closed one.'
json = self.manager.power_on_droplet(self.id)
self.update_attr(json)
def ensure_powered_on(self, wait=True, wait_timeout=300):
if self.is_powered_on():
return
if self.status == 'off': # powered off
self.power_on()
if wait:
end_time = time.time() + wait_timeout
while time.time() < end_time:
time.sleep(min(20, end_time - time.time()))
self.update_attr()
if self.is_powered_on():
if not self.ip_address:
raise TimeoutError('No ip is found.', self.id)
return
raise TimeoutError('Wait for droplet running timeout', self.id)
def destroy(self):
return self.manager.destroy_droplet(self.id)
@classmethod
def setup(cls, client_id, api_key):
cls.manager = DoManager(client_id, api_key)
@classmethod
def add(cls, name, size_id, image_id, region_id, ssh_key_ids=None):
json = cls.manager.new_droplet(name, size_id, image_id, region_id, ssh_key_ids)
droplet = cls(json)
return droplet
@classmethod
def find(cls, id=None, name=None):
if not id and not name:
return False
droplets = cls.list_all()
# Check first by id. digital ocean requires that it be unique
for droplet in droplets:
if droplet.id == id:
return droplet
# Failing that, check by hostname.
for droplet in droplets:
if droplet.name == name:
return droplet
return False
@classmethod
def list_all(cls):
json = cls.manager.all_active_droplets()
return map(cls, json)
class SSH(JsonfyMixIn):
manager = None
def __init__(self, ssh_key_json):
self.__dict__.update(ssh_key_json)
update_attr = __init__
def destroy(self):
self.manager.destroy_ssh_key(self.id)
return True
@classmethod
def setup(cls, client_id, api_key):
cls.manager = DoManager(client_id, api_key)
@classmethod
def find(cls, name):
if not name:
return False
keys = cls.list_all()
for key in keys:
if key.name == name:
return key
return False
@classmethod
def list_all(cls):
json = cls.manager.all_ssh_keys()
return map(cls, json)
@classmethod
def add(cls, name, key_pub):
json = cls.manager.new_ssh_key(name, key_pub)
return cls(json)
def core(module):
def getkeyordie(k):
v = module.params[k]
if v is None:
module.fail_json(msg='Unable to load %s' % k)
return v
try:
# params['client_id'] will be None even if client_id is not passed in
client_id = module.params['client_id'] or os.environ['DO_CLIENT_ID']
api_key = module.params['api_key'] or os.environ['DO_API_KEY']
except KeyError, e:
module.fail_json(msg='Unable to load %s' % e.message)
changed = True
command = module.params['command']
state = module.params['state']
if command == 'droplet':
Droplet.setup(client_id, api_key)
if state in ('active', 'present'):
# First, try to find a droplet by id.
droplet = Droplet.find(id=module.params['id'])
# If we couldn't find the droplet and the user is allowing unique
# hostnames, then check to see if a droplet with the specified
# hostname already exists.
if not droplet and module.params['unique_name']:
droplet = Droplet.find(name=getkeyordie('name'))
# If both of those attempts failed, then create a new droplet.
if not droplet:
droplet = Droplet.add(
name=getkeyordie('name'),
size_id=getkeyordie('size_id'),
image_id=getkeyordie('image_id'),
region_id=getkeyordie('region_id'),
ssh_key_ids=module.params['ssh_key_ids']
)
if droplet.is_powered_on():
changed = False
droplet.ensure_powered_on(
wait=getkeyordie('wait'),
wait_timeout=getkeyordie('wait_timeout')
)
module.exit_json(changed=changed, droplet=droplet.to_json())
elif state in ('absent', 'deleted'):
# First, try to find a droplet by id.
droplet = Droplet.find(id=getkeyordie('id'))
# If we couldn't find the droplet and the user is allowing unique
# hostnames, then check to see if a droplet with the specified
# hostname already exists.
if not droplet and module.params['unique_name']:
droplet = Droplet.find(name=getkeyordie('name'))
if not droplet:
module.exit_json(changed=False, msg='The droplet is not found.')
event_json = droplet.destroy()
module.exit_json(changed=True, event_id=event_json['event_id'])
elif command == 'ssh':
SSH.setup(client_id, api_key)
name = getkeyordie('name')
if state in ('active', 'present'):
key = SSH.find(name)
if key:
module.exit_json(changed=False, ssh_key=key.to_json())
key = SSH.add(name, getkeyordie('ssh_pub_key'))
module.exit_json(changed=True, ssh_key=key.to_json())
elif state in ('absent', 'deleted'):
key = SSH.find(name)
if not key:
module.exit_json(changed=False, msg='SSH key with the name of %s is not found.' % name)
key.destroy()
module.exit_json(changed=True)
def main():
module = AnsibleModule(
argument_spec = dict(
command = dict(choices=['droplet', 'ssh'], default='droplet'),
state = dict(choices=['active', 'present', 'absent', 'deleted'], default='present'),
client_id = dict(aliases=['CLIENT_ID'], no_log=True),
api_key = dict(aliases=['API_KEY'], no_log=True),
name = dict(type='str'),
size_id = dict(type='int'),
image_id = dict(type='int'),
region_id = dict(type='int'),
ssh_key_ids = dict(default=''),
id = dict(aliases=['droplet_id'], type='int'),
unique_name = dict(type='bool', choices=BOOLEANS, default='no'),
wait = dict(type='bool', choices=BOOLEANS, default='yes'),
wait_timeout = dict(default=300, type='int'),
ssh_pub_key = dict(type='str'),
),
required_together = (
['size_id', 'image_id', 'region_id'],
),
mutually_exclusive = (
['size_id', 'ssh_pub_key'],
['image_id', 'ssh_pub_key'],
['region_id', 'ssh_pub_key'],
),
required_one_of = (
['id', 'name'],
),
)
try:
core(module)
except TimeoutError as e:
module.fail_json(msg=str(e), id=e.id)
except (DoError, Exception) as e:
module.fail_json(msg=str(e))
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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