# Copyright (c) 2009 Reza Lotun http://reza.lotun.name/ # # Permission is hereby granted, free of charge, to any person obtaining a # copy of this software and associated documentation files (the # "Software"), to deal in the Software without restriction, including # without limitation the rights to use, copy, modify, merge, publish, dis- # tribute, sublicense, and/or sell copies of the Software, and to permit # persons to whom the Software is furnished to do so, subject to the fol- # lowing conditions: # # The above copyright notice and this permission notice shall be included # in all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL- # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS # IN THE SOFTWARE. """ This module provides an interface to the Elastic Compute Cloud (EC2) Auto Scaling service. """ import boto from boto import config from boto.connection import AWSQueryConnection from boto.resultset import ResultSet from boto.ec2.regioninfo import RegionInfo from boto.ec2.autoscale.request import Request from boto.ec2.autoscale.trigger import Trigger from boto.ec2.autoscale.launchconfig import LaunchConfiguration from boto.ec2.autoscale.group import AutoScalingGroup from boto.ec2.autoscale.activity import Activity class AutoScaleConnection(AWSQueryConnection): APIVersion = boto.config.get('Boto', 'autoscale_version', '2009-05-15') Endpoint = boto.config.get('Boto', 'autoscale_endpoint', 'autoscaling.amazonaws.com') SignatureVersion = '2' def __init__(self, aws_access_key_id=None, aws_secret_access_key=None, is_secure=True, port=None, proxy=None, proxy_port=None, proxy_user=None, proxy_pass=None, host=Endpoint, debug=1, https_connection_factory=None, region=None, path='/'): """ Init method to create a new connection to the AutoScaling service. B{Note:} The host argument is overridden by the host specified in the boto configuration file. """ AWSQueryConnection.__init__(self, aws_access_key_id, aws_secret_access_key, is_secure, port, proxy, proxy_port, proxy_user, proxy_pass, host, debug, https_connection_factory, path=path) def build_list_params(self, params, items, label): """ items is a list of dictionaries or strings: [{'Protocol' : 'HTTP', 'LoadBalancerPort' : '80', 'InstancePort' : '80'},..] etc. or ['us-east-1b',...] """ # different from EC2 list params for i in xrange(1, len(items)+1): if isinstance(items[i-1], dict): for k, v in items[i-1].iteritems(): params['%s.member.%d.%s' % (label, i, k)] = v elif isinstance(items[i-1], basestring): params['%s.member.%d' % (label, i)] = items[i-1] def _update_group(self, op, as_group): params = { 'AutoScalingGroupName' : as_group.name, 'Cooldown' : as_group.cooldown, 'LaunchConfigurationName' : as_group.launch_config_name, 'MinSize' : as_group.min_size, 'MaxSize' : as_group.max_size, } if op.startswith('Create'): if as_group.availability_zones: zones = self.availability_zones else: zones = [as_group.availability_zone] self.build_list_params(params, as_group.load_balancers, 'LoadBalancerNames') self.build_list_params(params, zones, 'AvailabilityZones') return self.get_object(op, params, Request) def create_auto_scaling_group(self, as_group): """ Create auto scaling group. """ return self._update_group('CreateAutoScalingGroup', as_group) def create_launch_configuration(self, launch_config): """ Creates a new Launch Configuration. :type launch_config: boto.ec2.autoscale.launchconfig.LaunchConfiguration :param launch_config: LaunchConfiguraiton object. """ params = { 'ImageId' : launch_config.image_id, 'KeyName' : launch_config.key_name, 'LaunchConfigurationName' : launch_config.name, 'InstanceType' : launch_config.instance_type, } if launch_config.user_data: params['UserData'] = launch_config.user_data if launch_config.kernel_id: params['KernelId'] = launch_config.kernel_id if launch_config.ramdisk_id: params['RamdiskId'] = launch_config.ramdisk_id if launch_config.block_device_mappings: self.build_list_params(params, launch_config.block_device_mappings, 'BlockDeviceMappings') self.build_list_params(params, launch_config.security_groups, 'SecurityGroups') return self.get_object('CreateLaunchConfiguration', params, Request) def create_trigger(self, trigger): """ """ params = {'TriggerName' : trigger.name, 'AutoScalingGroupName' : trigger.autoscale_group.name, 'MeasureName' : trigger.measure_name, 'Statistic' : trigger.statistic, 'Period' : trigger.period, 'Unit' : trigger.unit, 'LowerThreshold' : trigger.lower_threshold, 'LowerBreachScaleIncrement' : trigger.lower_breach_scale_increment, 'UpperThreshold' : trigger.upper_threshold, 'UpperBreachScaleIncrement' : trigger.upper_breach_scale_increment, 'BreachDuration' : trigger.breach_duration} # dimensions should be a list of tuples dimensions = [] for dim in trigger.dimensions: name, value = dim dimensions.append(dict(Name=name, Value=value)) self.build_list_params(params, dimensions, 'Dimensions') req = self.get_object('CreateOrUpdateScalingTrigger', params, Request) return req def get_all_groups(self, names=None): """ """ params = {} if names: self.build_list_params(params, names, 'AutoScalingGroupNames') return self.get_list('DescribeAutoScalingGroups', params, [('member', AutoScalingGroup)]) def get_all_launch_configurations(self, names=None): """ """ params = {} if names: self.build_list_params(params, names, 'LaunchConfigurationNames') return self.get_list('DescribeLaunchConfigurations', params, [('member', LaunchConfiguration)]) def get_all_activities(self, autoscale_group, activity_ids=None, max_records=100): """ Get all activities for the given autoscaling group. :type autoscale_group: str or AutoScalingGroup object :param autoscale_group: The auto scaling group to get activities on. @max_records: int :param max_records: Maximum amount of activities to return. """ name = autoscale_group if isinstance(autoscale_group, AutoScalingGroup): name = autoscale_group.name params = {'AutoScalingGroupName' : name} if activity_ids: self.build_list_params(params, activity_ids, 'ActivityIds') return self.get_list('DescribeScalingActivities', params, [('member', Activity)]) def get_all_triggers(self, autoscale_group): params = {'AutoScalingGroupName' : autoscale_group} return self.get_list('DescribeTriggers', params, [('member', Trigger)]) def terminate_instance(self, instance_id, decrement_capacity=True): params = { 'InstanceId' : instance_id, 'ShouldDecrementDesiredCapacity' : decrement_capacity } return self.get_object('TerminateInstanceInAutoScalingGroup', params, Activity)