Class: AwsCache

Inherits:
Object
  • Object
show all
Defined in:
lib/aws-cache.rb

Constant Summary collapse

VERSION =

Please follow semantic versioning (semver.org).

AwsCacheVersion::VERSION

Instance Method Summary collapse

Constructor Details

#initialize(opts) ⇒ AwsCache

Returns a new instance of AwsCache.



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# File 'lib/aws-cache.rb', line 13

def initialize(opts)
  unless opts.has_key?('port') then opts['port'] = 6379 end
  unless opts.has_key?('host') then opts['host'] = 'aws-cache' end
  @redis = optional_element(opts, ['redis'])
  if @redis.nil?
    @redis = Redis.new(url: "redis://#{opts['host']}:#{opts['port']}/0")
  end
  @keyspace = optional_element(opts, ['keyspace'], AwsCache::VERSION)
  @region = optional_element(opts, ['region'], 'us-east-1')
end

Instance Method Details

#describe_auto_scaling_group(asg) ⇒ Object

Returns Aws::AutoScaling::Types::AutoScalingGroup



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# File 'lib/aws-cache.rb', line 90

def describe_auto_scaling_group(asg)
  asgroups = self.describe_autoscaling_groups()
  target_asg = asgroups.select do |record|
    record[:auto_scaling_group_name] == asg
  end
  if target_asg then
    return target_asg[0]
  end
  return nil
end

#describe_auto_scaling_instances ⇒ Object 



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# File 'lib/aws-cache.rb', line 129

def describe_auto_scaling_instances()
  output = cache_get("describe_auto_scaling_instances", 300) do
    aws_object = Aws::AutoScaling::Client.new(region: @region)
    pages = aws_object.describe_auto_scaling_instances()
    output = process_page( 'auto_scaling_instances', pages)
  end
  return output
end

#describe_autoscaling_groups ⇒ Object

Returns an Array of Hashes containing auto scaling group structures



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# File 'lib/aws-cache.rb', line 140

def describe_autoscaling_groups()
  output = cache_get('get_autoscaling_groups', 300) do
    aws_object = Aws::AutoScaling::Client.new(region: @region) 
    pages = aws_object.describe_auto_scaling_groups
    output = process_page( 'auto_scaling_groups', pages)
  end
  return output
end

#describe_instance(instance_id) ⇒ Object

Returns a hash describing the instance requested.



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# File 'lib/aws-cache.rb', line 25

def describe_instance( instance_id)
  instances = self.describe_instances()
  instance = instances.select do |entry|
    entry[:instances][0][:instance_id] == instance_id
  end
  return instance[0]
end

#describe_instances ⇒ Object

Returns an Array of Hashes containing instance structures



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# File 'lib/aws-cache.rb', line 150

def describe_instances()
  output = cache_get('describe_instances', 300) do
    aws_object = Aws::EC2::Client.new(region: @region)
    pages = aws_object.describe_instances
    output = process_page( 'reservations', pages)
  end
  return output
end

#describe_snapshots ⇒ Object 



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# File 'lib/aws-cache.rb', line 101

def describe_snapshots()
  output = cache_get('get_snapshots', 300) do
    aws_object = Aws::EC2::Client.new(region: @region)
    pages = aws_object.describe_snapshots
    output = process_page( 'snapshots', pages)
  end
  return output
end

#describe_stack(stack_name) ⇒ Object

Returns a hash describing the stack requested.



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# File 'lib/aws-cache.rb', line 69

def describe_stack(stack_name)
  stacks = self.describe_stacks
  stacks.each do |stack|
    if stack[:stack_name] == stack_name
      return stack
    end
  end
  return nil
end

#describe_stacks ⇒ Object 



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# File 'lib/aws-cache.rb', line 119

def describe_stacks()
  output = cache_get('get_stacks', 300) do
    aws_object = Aws::CloudFormation::Client.new(region: @region)
    pages = aws_object.describe_stacks
    output = process_page( 'stacks', pages)
  end
  return output
end

#get_asg_instances(asg) ⇒ Object

Returns an array of hashes of instances.



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# File 'lib/aws-cache.rb', line 80

def get_asg_instances(asg)
  instances = Array.new()
  asg_instances = self.describe_auto_scaling_group(asg)
  asg_instances[:instances].each do |instance|
    instances.push(instance)
  end
  return instances
end

#get_sub_stacks(stack_name) ⇒ Object

Returns an array of hashes describing the substacks for the selected stack.



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# File 'lib/aws-cache.rb', line 53

def get_sub_stacks( stack_name)
  substacks = Array.new()
  stacks = self.list_stack_resources(stack_name)
  stacks.each do |entry|
    if entry[:resource_type] == "AWS::CloudFormation::Stack"
      self.describe_stacks.each do |stack|
        if entry[:physical_resource_id] == stack[:stack_id]
          substacks.push(stack)
        end
      end
    end
  end
  return substacks
end

#list_stack_resources(stack_name) ⇒ Object 



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# File 'lib/aws-cache.rb', line 110

def list_stack_resources( stack_name)
  output = cache_get("list_stack_resources-#{stack_name}", 300) do
    aws_object = Aws::CloudFormation::Client.new(region: @region)
    pages = aws_object.list_stack_resources(stack_name: stack_name)
    output = process_page( 'stack_resource_summaries', pages)
  end
  return output
end

#process_page(key, pages) ⇒ Object 



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# File 'lib/aws-cache.rb', line 159

def process_page( key, pages)
  output = Array.new()
  pages.each do |page|
    data = page.send( key)
    data.each do |asg|
      output.push(asg)
    end
  end
  return output
end

#stack_auto_scaling_groups(stack_name) ⇒ Object

Returns an array of hashes describing the autoscaling groups for the selected stack.



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# File 'lib/aws-cache.rb', line 34

def stack_auto_scaling_groups(stack_name)
  auto_scaling_groups = Array.new()
  stack_resources = self.list_stack_resources(stack_name)
  asg_groups = stack_resources.select do |record|
    record[:resource_type] == "AWS::AutoScaling::AutoScalingGroup"
  end
  auto_scaling_groups.concat(asg_groups)
  substacks = stack_resources.select do |record|
    record[:resource_type] == "AWS::CloudFormation::Stack"
  end
  if substacks.length > 0 then
    substacks.each do |stack|
      auto_scaling_groups.concat(self.stack_auto_scaling_groups(stack[:physical_resource_id]))
    end
  end
  return auto_scaling_groups
end