Class: BuildCloud::LaunchConfiguration

Inherits:
Object
  • Object
show all
Includes:
Component
Defined in:
lib/build-cloud/launchconfiguration.rb

Constant Summary collapse

@@objects = 
[]

Instance Method Summary collapse

Methods included from Component

included

Constructor Details

#initialize(fog_interfaces, log, options = {}) ⇒ LaunchConfiguration

Returns a new instance of LaunchConfiguration.



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# File 'lib/build-cloud/launchconfiguration.rb', line 10

def initialize ( fog_interfaces, log, options = {} )

    @as      = fog_interfaces[:as]
    @log     = log
    @options = options

    @log.debug( options.inspect )

    required_options(:id, :image_id, :key_name, :instance_type)
    require_one_of(:security_groups, :security_group_names)
    require_one_of(:user_data, :user_data_file, :user_data_template)

end

Instance Method Details

#create ⇒ Object 



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# File 'lib/build-cloud/launchconfiguration.rb', line 24

def create

    options = @options.dup

    unless options[:security_groups]

        options[:security_groups] = []

        options[:security_group_names].each do |sg|
            options[:security_groups] << BuildCloud::SecurityGroup.get_id_by_name( sg )
        end

        options.delete(:security_group_names)

    end

    if options[:user_data]

        options[:user_data] = JSON.generate( @options[:user_data] )

    elsif options[:user_data_file]

        user_data_file_path = File.join( Dir.pwd, options[:user_data_file])

        if File.exists?( user_data_file_path )
            options[:user_data] = File.read( user_data_file_path )
            options.delete(:user_data_file)
        else
            @log.error("config lists a :user_data_file that doesn't exist at #{options[:user_data_file]}")
        end

    elsif options[:user_data_template]

        variable_hash = options[:user_data_variables]

        user_data_template_path = ''
        if options[:user_data_template].include? '/'
            user_data_template_path = options[:user_data_template]
        else
            user_data_template_path = File.join( Dir.pwd, options[:user_data_template])
        end

        if File.exists?( user_data_template_path )
            template = File.read( user_data_template_path )
            ### We set 'trim_mode' to '-', which supresses end of line white space on lines ending in '-%>'
            ### see http://ruby-doc.org/stdlib-2.1.2/libdoc/erb/rdoc/ERB.html#method-c-new
            buffer = ERB.new(template,nil,'-').result(binding)
            options[:user_data] = buffer
            options.delete(:user_data_variables)
            options.delete(:user_data_template)
        else
            @log.error("config lists a :user_data_template that doesn't exist at #{options[:user_data_template]}")
        end

    end

    unless exists?
        @log.info( "Creating launch configuration #{@options[:id]}" )
        launch_config = @as.configurations.new( options )
        launch_config.save
    else
        @log.debug( "Assessing launch configuration #{@options[:id]}" )
        fog_options = {}
        fog_object.attributes.each do |k, v|
            if v.nil?
                next
            elsif k == :id
                # launch config id has time stamp appended.
                # fog_object returns the latest matching launch config
                # but to do a match for changed values we need to modify
                fog_options[k] = options[:id]
            elsif k == :user_data
                # need to decode the user_data
                fog_options[k] = Base64.decode64(v)
            elsif k == :block_device_mappings
                # Some data jogging to get the block device mapping options into the 
                # same format that fog_object returns them.
                fog_options[:block_device_mappings] = []
                v.each do |mapping|
                    block_device = {}
                    for key, value in mapping
                        keyname = format("#{key}")
                        if keyname == 'Ebs'
                            for ebs_key, ebs_value in value
                                ebs_value = Integer(ebs_value) rescue ebs_value
                                block_device.merge!({ :"Ebs.#{ebs_key}" => ebs_value })
                            end
                        else
                            block_device.merge!({ :"#{keyname}" => value })
                        end
                    end
                    fog_options[k].push(block_device)
                end
            elsif k == :instance_monitoring
                # instance monitoring value needs to be tweaked
                fog_options[k] = {:enabled => v}
            elsif k == :classic_link_security_groups and v.empty?
                next
            elsif k == :created_at or k == :arn
                next
            else
                fog_options[k] = v
            end
        end
        
        # Duplicate options and then ensure that some defaults are present if missing
        munged_options = options.dup
        
        # default ebs_optimized is false
        if munged_options[:ebs_optimized].nil?
            munged_options[:ebs_optimized] = false
        end
        
        if munged_options[:instance_monitoring].nil?
            munged_options[:instance_monitoring] = {:enabled => true}
        end
        
        @log.debug("Fog options: #{fog_options.inspect}")
        @log.debug("Munged options: #{munged_options.inspect}")
        
        differences = {}
        removals = {}
        munged_options.each {|k, v| differences[k] = fog_options[k] if fog_options[k] != v }
        fog_options.each {|k, v| removals[k] = munged_options[k] if ! munged_options[k] }
        
        unless fog_options == munged_options
            @log.debug("Differences between fog and options is: #{differences}")
            @log.debug("Removals between fog and options is: #{removals}")
            
            @log.info("Updating Launch Configuration #{fog_object.id}")
            # Now for some useful messaging
            differences.each do |k,v|
                @log.info(" ... updating #{k}")
            end
            removals.each do |k,v|
                @log.info(" ... removing #{k}")
            end
            
            # create new configuration
            # update id to have current unix timestamp
            munged_options = options.dup
            munged_options[:id] = "#{munged_options[:id]}_#{Time.now.to_i}"
            current_launch_id = "#{fog_object.id}"
            
            dsl = @as.describe_launch_configurations( { 'LaunchConfigurationNames' => munged_options[:id]} )
            dsl = dsl.body['DescribeLaunchConfigurationsResult']['LaunchConfigurations']
            if dsl.empty?
                @log.info("Creating launch configuration #{munged_options[:id]}")
                
                # create new fog object
                launch_config = @as.configurations.new( munged_options )
                launch_config.save
                
                # update any associated ASG's
                asgs = @as.describe_auto_scaling_groups().body['DescribeAutoScalingGroupsResult']['AutoScalingGroups']
                asgs.each do |asg|
                    @log.debug("Checking ASG #{asg['AutoScalingGroupName']}")
                    if asg['LaunchConfigurationName'] == current_launch_id
                        @log.info("Updating ASG #{asg['AutoScalingGroupName']} ")
                        @as.update_auto_scaling_group(asg['AutoScalingGroupName'], {'LaunchConfigurationName' => munged_options[:id]})
                    end
                end
                
                # delete old configuration
                @log.info("Deleting launch configuration #{current_launch_id}")
                @as.delete_launch_configuration( current_launch_id )
            else
                @log.error("Launch Configuration #{munged_options[:id]} already exists!")
                @log.error("Not updating ASG Launch Configuration #{options[:id]}")
            end
        end
        
    end

    @log.debug( launch_config.inspect )

end

#delete ⇒ Object 



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# File 'lib/build-cloud/launchconfiguration.rb', line 234

def delete

    return unless exists?

    @log.info( "Deleting Launch Configuration #{@options[:id]}" )

    fog_object.destroy

end

#read ⇒ Object Also known as: fog_object 



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# File 'lib/build-cloud/launchconfiguration.rb', line 202

def read
    # ASG Launch configs are now created with a _unix_timestamp at the end
    # identify matching and return the one which was last created
    confs = @as.configurations.select { |lc| lc.id.start_with?(@options[:id]) }
    
    confs.each do |conf|
        begin
            id = conf.id.dup
            # if ID's match exactly, then keep in list
            next if id == @options[:id]
            sliced = id.slice!("#{@options[:id]}_")
            # if we can't slice off the id and _ then assume it's not one of our LC
            raise "No initial time match" if sliced.nil?
            time_slice = id.to_i
            # if converted int and string don't match, then it's not a match
            raise "No true int derived" unless time_slice.to_s == id
            # if we have an int that is 0, then it's not a match
            raise "Time int derived as 0" if time_slice == 0
            dt = Time.at(time_slice)
            @log.debug("Derived time stamp for #{conf.id} is #{dt}")
        rescue
            @log.debug("#{conf.id} is not a match")
            @log.debug("Details: #{$!}")
            confs.delete(conf)
        end
    end
    
    confs.max_by {|o| o.created_at}
end