Class: Cumulus::Kinesis::Manager

Inherits:
Common::Manager show all
Defined in:
lib/kinesis/manager/Manager.rb

Instance Method Summary collapse

Methods inherited from Common::Manager

#diff, #diff_one, #filter_local, #list, #sync, #sync_one

Constructor Details

#initialize ⇒ Manager

Returns a new instance of Manager.



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# File 'lib/kinesis/manager/Manager.rb', line 14

def initialize
  super()
  @create_asset = true
  @client = Aws::Kinesis::Client.new(Configuration.instance.client)
end

Instance Method Details

#added_diff(local) ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 36

def added_diff(local)
  StreamDiff.added(local)
end

#aws_resources ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 28

def aws_resources
  @aws_resources ||= Kinesis::named_streams
end

#create(local) ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 67

def create(local)
  @client.create_stream({
    stream_name: local.name,
    shard_count: local.shards
  })

  @client.wait_until(:stream_exists, {
    stream_name: local.name
  })

  # Describe the newly created stream
  created_stream = Kinesis::describe_stream(local.name)

  # If the stream retention period is different, then update it
  if created_stream.retention_period_hours > local.retention_period
    @client.decrease_stream_retention_period({
      stream_name: local.name,
      retention_period_hours: local.retention_period
    })
  elsif created_stream.retention_period_hours < local.retention_period
    @client.increase_stream_retention_period({
      stream_name: local.name,
      retention_period_hours: local.retention_period
    })
  end

  # If the created stream has tags, add them
  if !local.tags.empty?
    @client.add_tags_to_stream({
      stream_name: local.name,
      tags: local.tags
    })
  end

end

#diff_resource(local, aws) ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 40

def diff_resource(local, aws)
  local.diff(aws)
end

#local_resources ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 24

def local_resources
  @local_resources ||= Hash[Loader.streams.map { |local| [local.name, local] }]
end

#migrate ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 44

def migrate
  puts Colors.blue("Migrating Kinesis Streams...")

  # Create the directories
  streams_dir = "#{@migration_root}/kinesis"

  if !Dir.exists?(@migration_root)
    Dir.mkdir(@migration_root)
  end
  if !Dir.exists?(streams_dir)
    Dir.mkdir(streams_dir)
  end

  Kinesis::named_streams.each do |name, stream|
    puts "Migrating stream #{name}"

    cumulus_stream = StreamConfig.new(name).populate!(stream)
    json = JSON.pretty_generate(cumulus_stream.to_hash)
    File.open("#{streams_dir}/#{name}.json", "w") { |f| f.write(json) }
  end

end

#resource_name ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 20

def resource_name
  "Kinesis Stream"
end

#unmanaged_diff(aws) ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 32

def unmanaged_diff(aws)
  StreamDiff.unmanaged(aws)
end

#update(local, diffs) ⇒ Object 



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# File 'lib/kinesis/manager/Manager.rb', line 103

def update(local, diffs)
  diffs.each do |diff|
    case diff.type
    when StreamChange::SHARDS

      # See if we are splitting or merging and make sure it is a multiple of 2
      if diff.aws < diff.local
        if diff.aws != diff.local / 2.0
          puts Colors.red("Can only increase the number of shards by a factor of 2")
        else
          aws_stream = Kinesis::named_streams[local.name]

          # Split the shards 1 at a time
          aws_stream.sorted_shards.each do |shard|
            puts Colors.blue("Splitting shard #{shard.shard_id}")

            # The splitting point is halfway between the hash start and end
            hash_start = shard.hash_key_range.starting_hash_key.to_i
            hash_end = shard.hash_key_range.ending_hash_key.to_i
            hash_split = hash_start + ((hash_end - hash_start) / 2)

            @client.split_shard({
              stream_name: local.name,
              shard_to_split: shard.shard_id,
              new_starting_hash_key: hash_split.to_s
            })

            # After every split we have to wait until the stream is ready
            @client.wait_until(:stream_exists, {
              stream_name: local.name
            })
          end

        end
      elsif diff.aws > diff.local
        aws_stream = Kinesis::named_streams[local.name]

        if aws_stream.sorted_shards.length != local.shards * 2.0
          puts Colors.red("Can only decrease the number of shards by a factor of 2")
        else
          # Merge the sorted shards in groups of 2
          aws_stream.sorted_shards.each_slice(2) do |slice|
            puts Colors.blue("Merging shards #{slice[0].shard_id} and #{slice[1].shard_id}")

            @client.merge_shards({
              stream_name: local.name,
              shard_to_merge: slice[0].shard_id,
              adjacent_shard_to_merge: slice[1].shard_id
            })

            # After every merge we have to wait until the stream is ready
            @client.wait_until(:stream_exists, {
              stream_name: local.name
            })
          end

        end
      end

    when StreamChange::RETENTION
      puts Colors.blue("Updating retention period...")


      if diff.aws > local.retention_period
        @client.decrease_stream_retention_period({
          stream_name: local.name,
          retention_period_hours: local.retention_period
        })
      elsif diff.aws < local.retention_period
        @client.increase_stream_retention_period({
          stream_name: local.name,
          retention_period_hours: local.retention_period
        })
      end

      # Wait for the stream to be in an active state or shard updates will fail
      @client.wait_until(:stream_exists, {
        stream_name: local.name
      })
    when StreamChange::TAGS
      puts Colors.blue("Updating tags...")

      if !diff.tags_to_remove.empty?
        @client.remove_tags_from_stream({
          stream_name: local.name,
          tag_keys: diff.tags_to_remove.keys
        })
      end

      if !diff.tags_to_add.empty?
        @client.add_tags_to_stream({
          stream_name: local.name,
          tags: diff.tags_to_add
        })
      end

    end
  end

end