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Add attach_ and detach_instances methods to autoscaling service (#1264)

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* add detach_instances functionality to autoscaling service

* use ASG_NAME_TAG constant

* cleanup models method a bit, add mocked DetachInstancesResult to
response template

* add attach_instances method
This commit is contained in:
John Kerkstra 2017-10-16 19:09:51 -05:00 • committed by Jack Danger
commit 5ef236e966
4 changed files with 277 additions and 21 deletions
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14
moto/autoscaling/exceptions.py Normal file
View file

@ -0,0 +1,14 @@
from __future__ import unicode_literals
from moto.core.exceptions import RESTError
class AutoscalingClientError(RESTError):
code = 500
class ResourceContentionError(AutoscalingClientError):
def __init__(self):
super(ResourceContentionError, self).__init__(
"ResourceContentionError",
"You already have a pending update to an Auto Scaling resource (for example, a group, instance, or load balancer).")

85
moto/autoscaling/models.py
View file

@ -5,6 +5,9 @@ from moto.core import BaseBackend, BaseModel
from moto.ec2 import ec2_backends
from moto.elb import elb_backends
from moto.elb.exceptions import LoadBalancerNotFoundError
from .exceptions import (
ResourceContentionError,
)
# http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AS_Concepts.html#Cooldown
DEFAULT_COOLDOWN = 300
@ -259,27 +262,8 @@ class FakeAutoScalingGroup(BaseModel):
# Need more instances
count_needed = int(self.desired_capacity) - int(curr_instance_count)
propagated_tags = {}
for tag in self.tags:
# boto uses 'propagate_at_launch
# boto3 and cloudformation use PropagateAtLaunch
if 'propagate_at_launch' in tag and tag['propagate_at_launch'] == 'true':
propagated_tags[tag['key']] = tag['value']
if 'PropagateAtLaunch' in tag and tag['PropagateAtLaunch']:
propagated_tags[tag['Key']] = tag['Value']
propagated_tags[ASG_NAME_TAG] = self.name
reservation = self.autoscaling_backend.ec2_backend.add_instances(
self.launch_config.image_id,
count_needed,
self.launch_config.user_data,
self.launch_config.security_groups,
instance_type=self.launch_config.instance_type,
tags={'instance': propagated_tags}
)
for instance in reservation.instances:
instance.autoscaling_group = self
self.instance_states.append(InstanceState(instance))
propagated_tags = self.get_propagated_tags()
self.replace_autoscaling_group_instances(count_needed, propagated_tags)
else:
# Need to remove some instances
count_to_remove = curr_instance_count - self.desired_capacity
@ -290,6 +274,31 @@ class FakeAutoScalingGroup(BaseModel):
instance_ids_to_remove)
self.instance_states = self.instance_states[count_to_remove:]
def get_propagated_tags(self):
propagated_tags = {}
for tag in self.tags:
# boto uses 'propagate_at_launch
# boto3 and cloudformation use PropagateAtLaunch
if 'propagate_at_launch' in tag and tag['propagate_at_launch'] == 'true':
propagated_tags[tag['key']] = tag['value']
if 'PropagateAtLaunch' in tag and tag['PropagateAtLaunch']:
propagated_tags[tag['Key']] = tag['Value']
return propagated_tags
def replace_autoscaling_group_instances(self, count_needed, propagated_tags):
propagated_tags[ASG_NAME_TAG] = self.name
reservation = self.autoscaling_backend.ec2_backend.add_instances(
self.launch_config.image_id,
count_needed,
self.launch_config.user_data,
self.launch_config.security_groups,
instance_type=self.launch_config.instance_type,
tags={'instance': propagated_tags}
)
for instance in reservation.instances:
instance.autoscaling_group = self
self.instance_states.append(InstanceState(instance))
class AutoScalingBackend(BaseBackend):
def __init__(self, ec2_backend, elb_backend):
@ -409,6 +418,40 @@ class AutoScalingBackend(BaseBackend):
instance_states.extend(group.instance_states)
return instance_states
def attach_instances(self, group_name, instance_ids):
group = self.autoscaling_groups[group_name]
original_size = len(group.instance_states)
if (original_size + len(instance_ids)) > group.max_size:
raise ResourceContentionError
else:
group.desired_capacity = original_size + len(instance_ids)
new_instances = [InstanceState(self.ec2_backend.get_instance(x)) for x in instance_ids]
for instance in new_instances:
self.ec2_backend.create_tags([instance.instance.id], {ASG_NAME_TAG: group.name})
group.instance_states.extend(new_instances)
self.update_attached_elbs(group.name)
def detach_instances(self, group_name, instance_ids, should_decrement):
group = self.autoscaling_groups[group_name]
original_size = len(group.instance_states)
detached_instances = [x for x in group.instance_states if x.instance.id in instance_ids]
for instance in detached_instances:
self.ec2_backend.delete_tags([instance.instance.id], {ASG_NAME_TAG: group.name})
new_instance_state = [x for x in group.instance_states if x.instance.id not in instance_ids]
group.instance_states = new_instance_state
if should_decrement:
group.desired_capacity = original_size - len(instance_ids)
else:
count_needed = len(instance_ids)
group.replace_autoscaling_group_instances(count_needed, group.get_propagated_tags())
self.update_attached_elbs(group_name)
return detached_instances
def set_desired_capacity(self, group_name, desired_capacity):
group = self.autoscaling_groups[group_name]
group.set_desired_capacity(desired_capacity)

55
moto/autoscaling/responses.py
View file

@ -87,6 +87,27 @@ class AutoScalingResponse(BaseResponse):
template = self.response_template(CREATE_AUTOSCALING_GROUP_TEMPLATE)
return template.render()
def attach_instances(self):
group_name = self._get_param('AutoScalingGroupName')
instance_ids = self._get_multi_param("InstanceIds.member")
self.autoscaling_backend.attach_instances(
group_name, instance_ids)
template = self.response_template(ATTACH_INSTANCES_TEMPLATE)
return template.render()
def detach_instances(self):
group_name = self._get_param('AutoScalingGroupName')
instance_ids = self._get_multi_param("InstanceIds.member")
should_decrement_string = self._get_param('ShouldDecrementDesiredCapacity')
if should_decrement_string == 'true':
should_decrement = True
else:
should_decrement = False
detached_instances = self.autoscaling_backend.detach_instances(
group_name, instance_ids, should_decrement)
template = self.response_template(DETACH_INSTANCES_TEMPLATE)
return template.render(detached_instances=detached_instances)
def describe_auto_scaling_groups(self):
names = self._get_multi_param("AutoScalingGroupNames.member")
token = self._get_param("NextToken")
@ -284,6 +305,40 @@ CREATE_AUTOSCALING_GROUP_TEMPLATE = """<CreateAutoScalingGroupResponse xmlns="ht
</ResponseMetadata>
</CreateAutoScalingGroupResponse>"""
ATTACH_INSTANCES_TEMPLATE = """<AttachInstancesResponse xmlns="http://autoscaling.amazonaws.com/doc/2011-01-01/">
<AttachInstancesResult>
</AttachInstancesResult>
<ResponseMetadata>
<RequestId>8d798a29-f083-11e1-bdfb-cb223EXAMPLE</RequestId>
</ResponseMetadata>
</AttachInstancesResponse>"""
DETACH_INSTANCES_TEMPLATE = """<DetachInstancesResponse xmlns="http://autoscaling.amazonaws.com/doc/2011-01-01/">
<DetachInstancesResult>
<Activities>
{% for instance in detached_instances %}
<member>
<ActivityId>5091cb52-547a-47ce-a236-c9ccbc2cb2c9EXAMPLE</ActivityId>
<AutoScalingGroupName>{{ group_name }}</AutoScalingGroupName>
<Cause>
At 2017-10-15T15:55:21Z instance {{ instance.instance.id }} was detached in response to a user request.
</Cause>
<Description>Detaching EC2 instance: {{ instance.instance.id }}</Description>
<StartTime>2017-10-15T15:55:21Z</StartTime>
<EndTime>2017-10-15T15:55:21Z</EndTime>
<StatusCode>InProgress</StatusCode>
<StatusMessage>InProgress</StatusMessage>
<Progress>50</Progress>
<Details>details</Details>
</member>
{% endfor %}
</Activities>
</DetachInstancesResult>
<ResponseMetadata>
<RequestId>8d798a29-f083-11e1-bdfb-cb223EXAMPLE</RequestId>
</ResponseMetadata>
</DetachInstancesResponse>"""
DESCRIBE_AUTOSCALING_GROUPS_TEMPLATE = """<DescribeAutoScalingGroupsResponse xmlns="http://autoscaling.amazonaws.com/doc/2011-01-01/">
<DescribeAutoScalingGroupsResult>
<AutoScalingGroups>