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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
module AWS
class SNS
# A module to enrich {Message} based on it originating from AutoScaling,
# which have a particular subject and message payload.
# Parses such messages into a more rich representation.
module FromAutoScaling
def self.extended base
base.origin = :autoscaling
end
# @return [Boolean] true when the SNS originates from auto-scaling
def applicable? sns
sns['Subject'] =~ /.*autoscaling:.*/i
end
module_function :applicable?
def body
return @body if defined? @body
@body = self.parse_from self.raw['Message']
end
# @return [Symbol] the auto-scaling event name
def event
return @event if defined? @event
e = body['Event']
@event = case
when e =~ /EC2_INSTANCE_TERMINATE/ then :ec2_instance_terminate
when e =~ /EC2_INSTANCE_TERMINATE_ERROR/ then :ec2_instance_terminate_error
when e =~ /EC2_INSTANCE_LAUNCH/ then :ec2_instance_launch
when e =~ /EC2_INSTANCE_LAUNCH_ERROR/ then :ec2_instance_launch_error
when e =~ /TEST_NOTIFICATION/ then :test_notification
else :unknown
end
end
# @return [String] the auto-scaling group name
def group_name
body['AutoScalingGroupName']
end
def status_code
body['StatusCode']
end
# @return [String] the instance-ID that is the subject of this event
def instance_id
body['EC2InstanceId']
end
# TODO: Further methods to fully expose what AS-SNS' carry as payload.
end
end
end
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