Refactor ec2_snapshot to make it more testable
This commit is contained in:
Robert Jailall
Toshio Kuratomi
parent
1f447ad5ba
commit
d10f3f7a7e
1 changed files with 151 additions and 85 deletions
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@ -74,9 +74,9 @@ options:
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- snapshot id to remove
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required: false
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version_added: "1.9"
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snapshot_max_age:
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last_snapshot_min_age:
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description:
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- If the volume's most recent snapshot has started less than `snapshot_max_age' minutes ago, a new snapshot will not be created.
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- If the volume's most recent snapshot has started less than `last_snapshot_min_age' minutes ago, a new snapshot will not be created.
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required: false
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default: 0
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version_added: "1.9"
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@ -115,10 +115,11 @@ EXAMPLES = '''
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- local_action:
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module: ec2_snapshot
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volume_id: vol-abcdef12
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snapshot_max_age: 60
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last_snapshot_min_age: 60
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'''
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import time
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import datetime
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try:
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import boto.ec2
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@ -127,7 +128,128 @@ except ImportError:
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HAS_BOTO = False
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def main():
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# Find the most recent snapshot
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def _get_snapshot_starttime(snap):
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return datetime.datetime.strptime(snap.start_time, '%Y-%m-%dT%H:%M:%S.000Z')
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def _get_most_recent_snapshot(snapshots, max_snapshot_age_secs=None, now=None):
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"""
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Gets the most recently created snapshot and optionally filters the result
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if the snapshot is too old
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:param snapshots: list of snapshots to search
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:param max_snapshot_age_secs: filter the result if its older than this
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:param now: simulate time -- used for unit testing
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:return:
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"""
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if len(snapshots) == 0:
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return None
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if not now:
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now = datetime.datetime.utcnow()
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youngest_snapshot = min(snapshots, key=_get_snapshot_starttime)
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# See if the snapshot is younger that the given max age
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snapshot_start = datetime.datetime.strptime(youngest_snapshot.start_time, '%Y-%m-%dT%H:%M:%S.000Z')
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snapshot_age = now - snapshot_start
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if max_snapshot_age_secs is not None:
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if snapshot_age.total_seconds() > max_snapshot_age_secs:
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return None
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return youngest_snapshot
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def _create_with_wait(snapshot, wait_timeout_secs, sleep_func=time.sleep):
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"""
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Wait for the snapshot to be created
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:param snapshot:
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:param wait_timeout_secs: fail this step after this many seconds
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:param sleep_func:
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:return:
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"""
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time_waited = 0
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snapshot.update()
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while snapshot.status != 'completed':
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sleep_func(3)
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snapshot.update()
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time_waited += 3
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if wait_timeout_secs and time_waited > wait_timeout_secs:
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return False
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return True
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def create_snapshot(module, ec2, state=None, description=None, wait=None,
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wait_timeout=None, volume_id=None, instance_id=None,
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snapshot_id=None, device_name=None, snapshot_tags=None,
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last_snapshot_min_age=None):
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snapshot = None
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changed = False
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required = [volume_id, snapshot_id, instance_id]
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if required.count(None) != len(required) - 1: # only 1 must be set
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module.fail_json(msg='One and only one of volume_id or instance_id or snapshot_id must be specified')
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if instance_id and not device_name or device_name and not instance_id:
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module.fail_json(msg='Instance ID and device name must both be specified')
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if instance_id:
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try:
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volumes = ec2.get_all_volumes(filters={'attachment.instance-id': instance_id, 'attachment.device': device_name})
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except boto.exception.BotoServerError, e:
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module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))
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if not volumes:
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module.fail_json(msg="Could not find volume with name %s attached to instance %s" % (device_name, instance_id))
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volume_id = volumes[0].id
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if state == 'absent':
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if not snapshot_id:
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module.fail_json(msg = 'snapshot_id must be set when state is absent')
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try:
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ec2.delete_snapshot(snapshot_id)
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except boto.exception.BotoServerError, e:
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# exception is raised if snapshot does not exist
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if e.error_code == 'InvalidSnapshot.NotFound':
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module.exit_json(changed=False)
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else:
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module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))
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# successful delete
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module.exit_json(changed=True)
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if last_snapshot_min_age > 0:
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try:
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current_snapshots = ec2.get_all_snapshots(filters={'volume_id': volume_id})
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except boto.exception.BotoServerError, e:
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module.fail_json(msg="%s: %s" % (e.error_code, e.error_message))
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last_snapshot_min_age = last_snapshot_min_age * 60 # Convert to seconds
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snapshot = _get_most_recent_snapshot(current_snapshots,
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max_snapshot_age_secs=last_snapshot_min_age)
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try:
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# Create a new snapshot if we didn't find an existing one to use
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if snapshot is None:
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snapshot = ec2.create_snapshot(volume_id, description=description)
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changed = True
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if wait:
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if not _create_with_wait(snapshot, wait_timeout):
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module.fail_json(msg='Timed out while creating snapshot.')
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if snapshot_tags:
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for k, v in snapshot_tags.items():
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snapshot.add_tag(k, v)
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except boto.exception.BotoServerError, e:
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module.fail_json(msg="%s: %s" % (e.error_code, e.error_message))
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module.exit_json(changed=changed,
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snapshot_id=snapshot.id,
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volume_id=snapshot.volume_id,
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volume_size=snapshot.volume_size,
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tags=snapshot.tags.copy())
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def create_snapshot_ansible_module():
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argument_spec = ec2_argument_spec()
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argument_spec.update(
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dict(
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@ -138,12 +260,17 @@ def main():
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device_name = dict(),
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wait = dict(type='bool', default=True),
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wait_timeout = dict(type='int', default=0),
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snapshot_max_age = dict(type='int', default=0),
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last_snapshot_min_age = dict(type='int', default=0),
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snapshot_tags = dict(type='dict', default=dict()),
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state = dict(choices=['absent','present'], default='present'),
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)
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)
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module = AnsibleModule(argument_spec=argument_spec)
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return module
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def main():
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module = create_snapshot_ansible_module()
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if not HAS_BOTO:
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module.fail_json(msg='boto required for this module')
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@ -155,91 +282,30 @@ def main():
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device_name = module.params.get('device_name')
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wait = module.params.get('wait')
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wait_timeout = module.params.get('wait_timeout')
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snapshot_max_age = module.params.get('snapshot_max_age')
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last_snapshot_min_age = module.params.get('last_snapshot_min_age')
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snapshot_tags = module.params.get('snapshot_tags')
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state = module.params.get('state')
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snapshot = None
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changed = False
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if not volume_id and not instance_id and not snapshot_id or volume_id and instance_id and snapshot_id:
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module.fail_json(msg='One and only one of volume_id or instance_id or snapshot_id must be specified')
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if instance_id and not device_name or device_name and not instance_id:
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module.fail_json(msg='Instance ID and device name must both be specified')
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ec2 = ec2_connect(module)
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if instance_id:
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try:
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volumes = ec2.get_all_volumes(filters={'attachment.instance-id': instance_id, 'attachment.device': device_name})
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if not volumes:
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module.fail_json(msg="Could not find volume with name %s attached to instance %s" % (device_name, instance_id))
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volume_id = volumes[0].id
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except boto.exception.BotoServerError, e:
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module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))
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if state == 'absent':
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if not snapshot_id:
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module.fail_json(msg = 'snapshot_id must be set when state is absent')
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try:
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snapshots = ec2.get_all_snapshots([snapshot_id])
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ec2.delete_snapshot(snapshot_id)
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module.exit_json(changed=True)
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except boto.exception.BotoServerError, e:
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# exception is raised if snapshot does not exist
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if e.error_code == 'InvalidSnapshot.NotFound':
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module.exit_json(changed=False)
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else:
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module.fail_json(msg = "%s: %s" % (e.error_code, e.error_message))
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if snapshot_max_age > 0:
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try:
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snapshot_max_age = snapshot_max_age * 60 # Convert to seconds
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current_snapshots = ec2.get_all_snapshots(filters={'volume_id': volume_id})
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# Find the most recent snapshot
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recent = dict(start_time=0, snapshot=None)
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for s in current_snapshots:
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start_time = time.mktime(time.strptime(s.start_time, '%Y-%m-%dT%H:%M:%S.000Z'))
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if start_time > recent['start_time']:
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recent['start_time'] = start_time
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recent['snapshot'] = s
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# Adjust snapshot start time to local timezone
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tz_adjustment = time.daylight and time.altzone or time.timezone
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recent['start_time'] -= tz_adjustment
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# See if the snapshot is younger that the given max age
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current_time = time.mktime(time.localtime())
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snapshot_age = current_time - recent['start_time']
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if snapshot_age < snapshot_max_age:
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snapshot = recent['snapshot']
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except boto.exception.BotoServerError, e:
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module.fail_json(msg="%s: %s" % (e.error_code, e.error_message))
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try:
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# Create a new snapshot if we didn't find an existing one to use
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if snapshot is None:
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snapshot = ec2.create_snapshot(volume_id, description=description)
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changed = True
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if wait:
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time_waited = 0
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snapshot.update()
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while snapshot.status != 'completed':
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time.sleep(3)
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snapshot.update()
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time_waited += 3
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if wait_timeout and time_waited > wait_timeout:
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module.fail_json('Timed out while creating snapshot.')
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for k, v in snapshot_tags.items():
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snapshot.add_tag(k, v)
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except boto.exception.BotoServerError, e:
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module.fail_json(msg="%s: %s" % (e.error_code, e.error_message))
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module.exit_json(changed=changed, snapshot_id=snapshot.id, volume_id=snapshot.volume_id,
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volume_size=snapshot.volume_size, tags=snapshot.tags.copy())
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create_snapshot(
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module=module,
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state=state,
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description=description,
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wait=wait,
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wait_timeout=wait_timeout,
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ec2=ec2,
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volume_id=volume_id,
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instance_id=instance_id,
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snapshot_id=snapshot_id,
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device_name=device_name,
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snapshot_tags=snapshot_tags,
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last_snapshot_min_age=last_snapshot_min_age
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)
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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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if __name__ == '__main__':
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main()
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