Module: Docker::Registry::Sync::CMD

Includes:
Docker::Registry::Sync
Defined in:
lib/docker/registry/sync/s3.rb,
lib/docker/registry/sync/cmd.rb,
lib/docker/registry/sync/sqs.rb

Constant Summary

Constants included from Docker::Registry::Sync

VERSION

Class Method Summary collapse

Class Method Details

.configure(source_bucket, target_buckets, sqs_queue) ⇒ Object 



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# File 'lib/docker/registry/sync/cmd.rb', line 12

def configure(source_bucket, target_buckets, sqs_queue)
  unless source_bucket.nil?
    source_region, source_bucket = source_bucket.split(':')
  else
    source_region, source_bucket = nil, nil
  end

  unless target_buckets.nil?
    target_buckets = target_buckets.split(',').collect { |bucket| bucket.split(':') }
  else
    target_buckets = nil
  end

  unless sqs_queue.nil?
    sqs_region, sqs_uri = sqs_queue.split(':')
  else
    sqs_region, sqs_uri = nil, nil
  end
  Docker::Registry::Sync.configure do |config|
    config.source_bucket = source_bucket
    config.source_region = source_region
    config.target_buckets = target_buckets
    config.sqs_region = sqs_region
    config.sqs_url = "https://#{sqs_uri}"
  end
  @config = Docker::Registry::Sync.config
end

.configure_signal_handlers ⇒ Object 



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# File 'lib/docker/registry/sync/cmd.rb', line 40

def configure_signal_handlers
  @terminated = false

  Signal.trap('INT') do
    @config.logger.error 'Received INT signal...'
    @terminated = true
  end
  Signal.trap('TERM') do
    @config.logger.error 'Received TERM signal...'
    @terminated = true
  end
end

.finalize_message(receipt_handle) ⇒ Object 



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# File 'lib/docker/registry/sync/sqs.rb', line 39

def finalize_message(receipt_handle)
  sqs = Aws::SQS::Client.new(region: @config.sqs_region)
  resp = sqs.delete_message(queue_url: @config.sqs_url,
                            receipt_handle: receipt_handle)
end

.image_exists?(image, bucket, region) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/docker/registry/sync/s3.rb', line 10

def image_exists?(image, bucket, region)
  s3 = Aws::S3::Client.new(region: region)
  begin
    s3.head_object(bucket: bucket, key: "registry/repositories/#{image}/_index_images")
  rescue Aws::S3::Errors::NotFound
    false
  else
    true
  end
end

.queue_sync(image, tag) ⇒ Object 



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# File 'lib/docker/registry/sync/cmd.rb', line 65

def queue_sync(image, tag)
  msgs = @config.target_buckets.map do |region, bucket|
    JSON.dump(retries: 0,
              image: image,
              tag: tag,
              source: {
                bucket: @config.source_bucket,
                region: @config.source_region
              },
              target: {
                bucket: bucket,
                region: region
              })
  end
  send_message_batch(msgs) ? 0 : 1
end

.run_sync ⇒ Object 



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# File 'lib/docker/registry/sync/cmd.rb', line 82

def run_sync
  ec = 1
  configure_signal_handlers
  begin
    @config.logger.info 'Polling queue for images to sync...'
    sqs = Aws::SQS::Client.new(region: @config.sqs_region)
    resp = sqs.receive_message(
      queue_url: @config.sqs_url,
      max_number_of_messages: 1,
      visibility_timeout: 900, # Give ourselves 15min to sync the image
      wait_time_seconds: 10, # Wait a maximum of 10s for a new message
    )
    @config.logger.info "SQS returned #{resp.messages.length} new images to sync..."
    if resp.messages.length == 1
      message = resp.messages[0]
      data = JSON.load(message.body)
      @config.logger.info "Image sync data:  #{data}"

      if image_exists?(data['image'], data['target']['bucket'], data['target']['region'])
        @config.logger.info("Syncing tag: #{data['image']}:#{data['tag']} to #{data['target']['region']}:#{data['target']['bucket']}")
        if sync_tag(data['image'], data['tag'], data['target']['bucket'], data['target']['region'], data['source']['bucket'], data['source']['region'])
          @config.logger.info("Finished syncing tag: #{data['image']}:#{data['tag']} to #{data['target']['region']}:#{data['target']['bucket']}")
          finalize_message(message.receipt_handle)
        else
          @config.logger.info("Falied to sync tag, leaving on queue: #{data['image']}:#{data['tag']} to #{data['target']['region']}:#{data['target']['bucket']}")
        end
      else
        @config.logger.info("Syncing image: #{data['image']} to #{data['target']['region']}:#{data['target']['bucket']}")
        if sync_image(data['image'], data['target']['bucket'], data['target']['region'], data['source']['bucket'], data['source']['region'])
          @config.logger.info("Finished syncing image: #{data['image']} to #{data['target']['region']}:#{data['target']['bucket']}")
          finalize_message(message.receipt_handle)
        else
          @config.logger.error("Failed to sync image, leaving on queue: #{data['image']} to #{data['target']['region']}:#{data['target']['bucket']}")
        end
      end
    end
    ec = 0
    sleep @config.empty_queue_sleep_time unless @terminated
  rescue Exception => e
    @config.logger.error "An unknown error occurred while monitoring queue: #{e}"
    @config.logger.error 'Exiting...'
    @terminated = true
    ec = 1
  end until @terminated
  ec
end

.send_message_batch(messages, retries = 5) ⇒ Object 



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# File 'lib/docker/registry/sync/sqs.rb', line 11

def send_message_batch(messages, retries = 5)
  if retries <= 0
    success = false
    messages.each do |msg|
      @config.logger.Error "Failed to Enqueue message: #{msg}"
    end
  else
    entries = messages.map do |msg|
      @config.logger.info "Enqueuing message: #{msg}"
      { id: Digest::MD5.hexdigest(msg), message_body: msg }
    end
    sqs = Aws::SQS::Client.new(region: @config.sqs_region)
    resp = sqs.send_message_batch(queue_url: @config.sqs_url,
                                  entries: entries)
    if resp.failed.length > 0
      rerun = resp.failed.map do |failed|
        @config.logger.warn "Failed to Enqueue message, re-enqueuing: #{msg}"
        messages.select { |m| Digest::MD5.hexdigest(m) == failed.id }[0]
      end
      sleep 1 # short sleep before trying again...
      success = send_message_batch(rerun, retries - 1)
    else
      success = true
    end
  end
  success
end

.sync(image, tag) ⇒ Object 



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# File 'lib/docker/registry/sync/cmd.rb', line 53

def sync(image, tag)
  success = false
  @config.target_buckets.each do |region, bucket|
    if image_exists?(image, bucket, region)
      success = sync_tag(image, tag, bucket, region)
    else
      success = sync_image(image, bucket, region)
    end
  end
  success ? 0 : 1
end

.sync_image(image, bucket, region, source_bucket = nil, source_region = nil) ⇒ Object 



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# File 'lib/docker/registry/sync/s3.rb', line 74

def sync_image(image, bucket, region, source_bucket = nil, source_region = nil)
  source_region ||= @config.source_region
  source_bucket ||= @config.source_bucket
  s3_source = Aws::S3::Client.new(region: source_region)
  s3_target = Aws::S3::Client.new(region: region)

  begin
    rep_prefix = "registry/repositories/#{image}/"
    sync_prefix(s3_source, s3_target, bucket, rep_prefix)

    img_index_resp = s3_source.get_object(bucket: source_bucket, key: "registry/repositories/#{image}/_index_images")
    JSON.load(img_index_resp.body.read).each do |image|
      image_prefix = "registry/images/#{image['id']}/"
      sync_prefix(s3_source, s3_target, bucket, image_prefix)
    end
  rescue Exception => e
    @config.logger.error "An unexpected error occoured while syncing image #{image}: #{e}"
    false
  else
    true
  end
end

.sync_keys(target_client, target_bucket, keys, source_bucket = nil) ⇒ Object 



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# File 'lib/docker/registry/sync/s3.rb', line 39

def sync_keys(target_client, target_bucket, keys, source_bucket = nil)
  source_bucket ||= @config.source_bucket
  keys.each do |key|
    @config.logger.info "Syncing key #{source_bucket}/#{key} to bucket #{target_bucket}"
    target_client.copy_object(acl: 'bucket-owner-full-control',
                              bucket: target_bucket,
                              key: key,
                              copy_source: "#{source_bucket}/#{key}")
  end
end

.sync_prefix(source_client, target_client, target_bucket, prefix, source_bucket = nil) ⇒ Object 



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# File 'lib/docker/registry/sync/s3.rb', line 21

def sync_prefix(source_client, target_client, target_bucket, prefix, source_bucket = nil)
  source_bucket ||= @config.source_bucket
  keys = []
  img_resp = source_client.list_objects(bucket: source_bucket, prefix: prefix)

  loop do
    img_resp.contents.each do |item|
      keys << item.key
    end
    if img_resp.last_page?
      break
    else
      img_resp.next_page
    end
  end
  sync_keys(target_client, target_bucket, keys)
end

.sync_tag(image, tag, bucket, region, source_bucket = nil, source_region = nil) ⇒ Object 



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# File 'lib/docker/registry/sync/s3.rb', line 50

def sync_tag(image, tag, bucket, region, source_bucket = nil, source_region = nil)
  source_region ||= @config.source_region
  source_bucket ||= @config.source_bucket

  s3_source = Aws::S3::Client.new(region: source_region)
  s3_target = Aws::S3::Client.new(region: region)

  begin
    keys = ["tag#{tag}_json", "tag_#{tag}", '_index_images'].map do |key|
      "registry/repositories/#{image}/#{key}"
    end
    sync_keys(s3_target, bucket, keys)

    img_id_resp = s3_source.get_object(bucket: source_bucket, key: "registry/repositories/#{image}/tag_#{tag}")
    img_prefix = "registry/images/#{img_id_resp.body.read}/"
    sync_prefix(s3_source, s3_target, bucket, img_prefix)
  rescue Exception => e
    @config.logger.error "An unexpected error occoured while syncing tag #{image}:#{tag}: #{e}"
    false
  else
    true
  end
end