Merge pull request #326 from preo/ec2-eip-refactor
Refactor and improve the EC2 Elastic IP module.
This commit is contained in:
Brian Coca
commit
05a2ef106f
1 changed files with 156 additions and 199 deletions
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@ -37,15 +37,11 @@ options:
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version_added: "1.4"
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reuse_existing_ip_allowed:
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description:
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- Reuse an EIP that is not associated to an instance (when available), instead of allocating a new one.
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- Reuse an EIP that is not associated to an instance (when available),'''
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''' instead of allocating a new one.
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required: false
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default: false
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version_added: "1.6"
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wait_timeout:
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description:
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- how long to wait in seconds for newly provisioned EIPs to become available
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default: 300
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version_added: "1.7"
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extends_documentation_fragment: aws
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author: Lorin Hochstein <lorin@nimbisservices.com>
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@ -53,9 +49,9 @@ notes:
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- This module will return C(public_ip) on success, which will contain the
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public IP address associated with the instance.
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- There may be a delay between the time the Elastic IP is assigned and when
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the cloud instance is reachable via the new address. Use wait_for and pause
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to delay further playbook execution until the instance is reachable, if
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necessary.
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the cloud instance is reachable via the new address. Use wait_for and
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pause to delay further playbook execution until the instance is reachable,
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if necessary.
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'''
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EXAMPLES = '''
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@ -78,7 +74,8 @@ EXAMPLES = '''
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ec2_eip: state='present'
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- name: provision new instances with ec2
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ec2: keypair=mykey instance_type=c1.medium image=ami-40603AD1 wait=yes group=webserver count=3
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ec2: keypair=mykey instance_type=c1.medium image=emi-40603AD1 wait=yes'''
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''' group=webserver count=3
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register: ec2
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- name: associate new elastic IPs with each of the instances
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ec2_eip: "instance_id={{ item }}"
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@ -97,178 +94,165 @@ try:
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except ImportError:
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HAS_BOTO = False
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wait_timeout = 0
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def associate_ip_and_instance(ec2, address, instance_id, module):
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if ip_is_associated_with_instance(ec2, address.public_ip, instance_id, module):
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module.exit_json(changed=False, public_ip=address.public_ip)
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class EIPException(Exception):
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pass
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def associate_ip_and_instance(ec2, address, instance_id, check_mode):
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if address_is_associated_with_instance(ec2, address, instance_id):
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return {'changed': False}
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# If we're in check mode, nothing else to do
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if module.check_mode:
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module.exit_json(changed=True)
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try:
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if address.domain == "vpc":
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res = ec2.associate_address(instance_id, allocation_id=address.allocation_id)
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if not check_mode:
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if address.domain == 'vpc':
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res = ec2.associate_address(instance_id,
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allocation_id=address.allocation_id)
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else:
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res = ec2.associate_address(instance_id, public_ip=address.public_ip)
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except boto.exception.EC2ResponseError, e:
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module.fail_json(msg=str(e))
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if res:
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module.exit_json(changed=True, public_ip=address.public_ip)
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else:
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module.fail_json(msg="association failed")
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res = ec2.associate_address(instance_id,
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public_ip=address.public_ip)
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if not res:
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raise EIPException('association failed')
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return {'changed': True}
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def disassociate_ip_and_instance(ec2, address, instance_id, module):
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if not ip_is_associated_with_instance(ec2, address.public_ip, instance_id, module):
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module.exit_json(changed=False, public_ip=address.public_ip)
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def disassociate_ip_and_instance(ec2, address, instance_id, check_mode):
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if not address_is_associated_with_instance(ec2, address, instance_id):
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return {'changed': False}
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# If we're in check mode, nothing else to do
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if module.check_mode:
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module.exit_json(changed=True)
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try:
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if address.domain == "vpc":
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res = ec2.disassociate_address(association_id=address.association_id)
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if not check_mode:
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if address.domain == 'vpc':
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res = ec2.disassociate_address(
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association_id=address.association_id)
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else:
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res = ec2.disassociate_address(public_ip=address.public_ip)
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except boto.exception.EC2ResponseError, e:
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module.fail_json(msg=str(e))
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if res:
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module.exit_json(changed=True)
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else:
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module.fail_json(msg="disassociation failed")
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if not res:
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raise EIPException('disassociation failed')
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return {'changed': True}
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def find_address(ec2, public_ip, module, fail_on_not_found=True):
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""" Find an existing Elastic IP address """
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if wait_timeout != 0:
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timeout = time.time() + wait_timeout
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while timeout > time.time():
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try:
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addresses = ec2.get_all_addresses([public_ip])
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break
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except boto.exception.EC2ResponseError, e:
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if "Address '%s' not found." % public_ip in e.message :
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if not fail_on_not_found:
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return None
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else:
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module.fail_json(msg=str(e.message))
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time.sleep(5)
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if timeout <= time.time():
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module.fail_json(msg = "wait for EIPs timeout on %s" % time.asctime())
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else:
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try:
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addresses = ec2.get_all_addresses([public_ip])
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except boto.exception.EC2ResponseError, e:
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if "Address '%s' not found." % public_ip in e.message :
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if not fail_on_not_found:
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return None
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module.fail_json(msg=str(e.message))
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return addresses[0]
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def ip_is_associated_with_instance(ec2, public_ip, instance_id, module):
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""" Check if the elastic IP is currently associated with the instance """
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address = find_address(ec2, public_ip, module)
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if address:
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return address.instance_id == instance_id
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else:
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return False
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def instance_is_associated(ec2, instance, module):
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"""
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Check if the given instance object is already associated with an
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elastic IP
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"""
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instance_ip = instance.ip_address
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if not instance_ip:
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return False
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eip = find_address(ec2, instance_ip, module, fail_on_not_found=False)
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return (eip and (eip.public_ip == instance_ip))
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def allocate_address(ec2, domain, module, reuse_existing_ip_allowed):
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""" Allocate a new elastic IP address (when needed) and return it """
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# If we're in check mode, nothing else to do
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if module.check_mode:
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module.exit_json(change=True)
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if reuse_existing_ip_allowed:
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if domain:
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domain_filter = { 'domain' : domain }
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else:
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domain_filter = { 'domain' : 'standard' }
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all_addresses = ec2.get_all_addresses(filters=domain_filter)
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unassociated_addresses = filter(lambda a: not a.instance_id, all_addresses)
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if unassociated_addresses:
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address = unassociated_addresses[0];
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else:
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address = ec2.allocate_address(domain=domain)
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else:
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address = ec2.allocate_address(domain=domain)
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return address
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def release_address(ec2, public_ip, module):
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""" Release a previously allocated elastic IP address """
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address = find_address(ec2, public_ip, module)
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# If we're in check mode, nothing else to do
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if module.check_mode:
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module.exit_json(change=True)
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res = address.release()
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if res:
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module.exit_json(changed=True)
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else:
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module.fail_json(msg="release failed")
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def find_instance(ec2, instance_id, module):
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""" Attempt to find the EC2 instance and return it """
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def _find_address_by_ip(ec2, public_ip):
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try:
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reservations = ec2.get_all_reservations(instance_ids=[instance_id])
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except boto.exception.EC2ResponseError, e:
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module.fail_json(msg=str(e))
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return ec2.get_all_addresses([public_ip])[0]
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except boto.exception.EC2ResponseError as e:
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if "Address '{}' not found.".format(public_ip) not in e.message:
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raise
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def _find_address_by_instance_id(ec2, instance_id):
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addresses = ec2.get_all_addresses(None, {'instance-id': instance_id})
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if addresses:
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return addresses[0]
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def find_address(ec2, public_ip, instance_id):
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""" Find an existing Elastic IP address """
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if public_ip:
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return _find_address_by_ip(ec2, public_ip)
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elif instance_id:
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return _find_address_by_instance_id(ec2, instance_id)
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def address_is_associated_with_instance(ec2, address, instance_id):
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""" Check if the elastic IP is currently associated with the instance """
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if address:
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return address and address.instance_id == instance_id
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return False
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def allocate_address(ec2, domain, reuse_existing_ip_allowed):
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""" Allocate a new elastic IP address (when needed) and return it """
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if reuse_existing_ip_allowed:
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domain_filter = {'domain': domain or 'standard'}
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all_addresses = ec2.get_all_addresses(filters=domain_filter)
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unassociated_addresses = [a for a in all_addresses
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if not a.instance_id]
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if unassociated_addresses:
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return unassociated_addresses[0]
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return ec2.allocate_address(domain=domain)
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def release_address(ec2, address, check_mode):
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""" Release a previously allocated elastic IP address """
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# If we're in check mode, nothing else to do
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if not check_mode:
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if not address.release():
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EIPException('release failed')
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return {'changed': True}
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def find_instance(ec2, instance_id):
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""" Attempt to find the EC2 instance and return it """
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reservations = ec2.get_all_reservations(instance_ids=[instance_id])
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if len(reservations) == 1:
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instances = reservations[0].instances
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if len(instances) == 1:
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return instances[0]
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module.fail_json(msg="could not find instance" + instance_id)
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def allocate_eip(ec2, eip_domain, module, reuse_existing_ip_allowed, new_eip_timeout):
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# Allocate a new elastic IP
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address = allocate_address(ec2, eip_domain, module, reuse_existing_ip_allowed)
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# overriding the timeout since this is a a newly provisioned ip
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global wait_timeout
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wait_timeout = new_eip_timeout
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return address
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raise EIPException("could not find instance" + instance_id)
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def ensure_present(ec2, domain, address, instance_id,
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reuse_existing_ip_allowed, check_mode):
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changed = False
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# Return the EIP object since we've been given a public IP
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if not address:
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if check_mode:
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return {'changed': True}
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address = allocate_address(ec2, domain, reuse_existing_ip_allowed)
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changed = True
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if instance_id:
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# Allocate an IP for instance since no public_ip was provided
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instance = find_instance(ec2, instance_id)
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if instance.vpc_id:
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domain = 'vpc'
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# Associate address object (provided or allocated) with instance
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assoc_result = associate_ip_and_instance(ec2, address, instance_id,
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check_mode)
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changed = changed or assoc_result['changed']
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return {'changed': changed, 'public_ip': address.public_ip}
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def ensure_absent(ec2, domain, address, instance_id, check_mode):
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if not address:
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return {'changed': False}
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# disassociating address from instance
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if instance_id:
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return disassociate_ip_and_instance(ec2, address, instance_id,
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check_mode)
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# releasing address
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else:
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return release_address(ec2, address, check_mode)
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def main():
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argument_spec = ec2_argument_spec()
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argument_spec.update(dict(
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instance_id = dict(required=False),
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public_ip = dict(required=False, aliases= ['ip']),
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state = dict(required=False, default='present',
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choices=['present', 'absent']),
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in_vpc = dict(required=False, type='bool', default=False),
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reuse_existing_ip_allowed = dict(required=False, type='bool', default=False),
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wait_timeout = dict(default=300),
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)
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)
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instance_id=dict(required=False),
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public_ip=dict(required=False, aliases=['ip']),
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state=dict(required=False, default='present',
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choices=['present', 'absent']),
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in_vpc=dict(required=False, type='bool', default=False),
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reuse_existing_ip_allowed=dict(required=False, type='bool',
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default=False),
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wait_timeout=dict(default=300),
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))
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module = AnsibleModule(
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argument_spec=argument_spec,
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@ -284,54 +268,27 @@ def main():
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public_ip = module.params.get('public_ip')
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state = module.params.get('state')
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in_vpc = module.params.get('in_vpc')
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domain = "vpc" if in_vpc else None
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domain = 'vpc' if in_vpc else None
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reuse_existing_ip_allowed = module.params.get('reuse_existing_ip_allowed')
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new_eip_timeout = int(module.params.get('wait_timeout'))
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if state == 'present':
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# If both instance_id and public_ip are not specified, allocate a new
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# elastic IP, and exit.
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if not instance_id and not public_ip:
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address = allocate_eip(ec2, domain, module,
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reuse_existing_ip_allowed, new_eip_timeout)
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module.exit_json(changed=True, public_ip=address.public_ip)
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try:
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address = find_address(ec2, public_ip, instance_id)
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# Return the EIP object since we've been given a public IP
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if public_ip:
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address = find_address(ec2, public_ip, module)
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if instance_id and not public_ip:
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instance = find_instance(ec2, instance_id, module)
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if instance.vpc_id:
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domain = "vpc"
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# Do nothing if the instance is already associated with an
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# elastic IP.
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if instance_is_associated(ec2, instance, module):
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module.exit_json(changed=False, public_ip=instance.ip_address)
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# If the instance is not already associated with an elastic IP,
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# allocate a new one.
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address = allocate_eip(
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ec2, domain, module, reuse_existing_ip_allowed, new_eip_timeout)
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# Associate address object (provided or allocated) with instance
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associate_ip_and_instance(ec2, address, instance_id, module)
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else:
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#disassociating address from instance
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if instance_id:
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address = find_address(ec2, public_ip, module)
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disassociate_ip_and_instance(ec2, address, instance_id, module)
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#releasing address
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if state == 'present':
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result = ensure_present(ec2, domain, address, instance_id,
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reuse_existing_ip_allowed,
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module.check_mode)
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else:
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release_address(ec2, public_ip, module)
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result = ensure_absent(ec2, domain, address, instance_id, module.check_mode)
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except (boto.exception.EC2ResponseError, EIPException) as e:
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module.fail_json(msg=str(e))
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module.exit_json(**result)
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# import module snippets
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from ansible.module_utils.basic import *
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from ansible.module_utils.ec2 import *
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from ansible.module_utils.basic import * # noqa
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from ansible.module_utils.ec2 import * # noqa
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if __name__ == '__main__':
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main()
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