Plugins » Docker

require 'uri'

module ForemanDocker

  class Docker < ::ComputeResource

    validates :url, :format => { :with => URI.regexp }

    def self.model_name

      ComputeResource.model_name

    end

    def self.get_container(container)

      conn = container.compute_resource.docker_connection

      ::Docker::Container.get(container.uuid, {}, conn)

    end

    def capabilities

      [:image]

    end

    def supports_update?

      false

    end

    def provided_attributes

      super.merge(:mac => :mac)

    end

    def max_memory

      16 * 1024 * 1024 * 1024

    end

    def max_cpu_count

      ::Docker.info['NCPU'] || 1

    end

    def available_images

      ::Docker::Image.all({}, docker_connection)

    end

    def local_images(filter = '')

      ::Docker::Image.all({ 'filter' => filter }, docker_connection)

    end

    def tags_for_local_image(image)

      image.info['RepoTags'].map do |image_tag|

        _, tag = image_tag.split(':')

        tag

      end

    end

    def exist?(name)

      ::Docker::Image.exist?(name, {}, docker_connection)

    end

    def image(id)

      ::Docker::Image.get(id, {}, docker_connection)

    end

    def tags(image_name)

      if exist?(image_name)

        tags_for_local_image(local_images(image_name).first)

      else

        # If image is not found in the compute resource, get the tags from the Hub

        hub_api_url = "https://index.docker.io/v1/repositories/#{image_name}/tags"

        JSON.parse(URI.parse(hub_api_url).read).map do |tag|

          tag['name']

        end

      end

    end

    def search(term = '')

      client.images.image_search(:term => term)

    end

    def provider_friendly_name

      'Docker'

    end

    def create_container(args = {})

      options = vm_instance_defaults.merge(args)

      logger.debug("Creating container with the following options: #{options.inspect}")

      docker_command do

        ::Docker::Container.create(options, docker_connection)

      end

    end

    def create_image(args = {})

      logger.debug("Creating docker image with the following options: #{args.inspect}")

      docker_command do

        ::Docker::Image.create(args, credentials, docker_connection)

      end

    end

    def vm_instance_defaults

      ActiveSupport::HashWithIndifferentAccess.new('name' => "foreman_#{Time.now.to_i}",

                                                   'Cmd' => ['/bin/bash'])

    end

    def console(uuid)

      test_connection

      container = ::Docker::Container.get(uuid, {}, docker_connection)

      {

        :name       => container.info['Name'],

        'timestamp' => Time.now.utc,

        'output'    => container.logs(:stdout => true, :tail => 100)

      }

    end

    def api_version

      ::Docker.version(docker_connection)

    end

    def authenticate!

      ::Docker.authenticate!(credentials, docker_connection)

    end

    def test_connection(options = {})

      super

      api_version

      credentials.empty? ? true : authenticate!

    # This should only rescue Fog::Errors, but Fog returns all kinds of errors...

    rescue => e

      errors[:base] << e.message

      false

    end

    def docker_connection

      @docker_connection ||= ::Docker::Connection.new(url, credentials)

    end

    protected

    def docker_command

      yield

    rescue Excon::Errors::Error, ::Docker::Error::DockerError => e

      logger.debug "Fog error: #{e.message}\n " + e.backtrace.join("\n ")

      errors.add(:base,

                 _("Error creating communicating with Docker. Check the Foreman logs: %s") %

                 e.message.to_s)

      false

    end

    def bootstrap(args)

      client.servers.bootstrap vm_instance_defaults.merge(args.to_hash)

    rescue Fog::Errors::Error => e

      errors.add(:base, e.to_s)

      false

    end

    def client

      opts = {

        :provider => 'fogdocker',

        :docker_url => url

      }

      opts[:docker_username] = user if user.present?

      opts[:docker_password] = password if password.present?

      opts[:docker_email] = email if email.present?

      @client ||= ::Fog::Compute.new(opts)

    end

    def credentials

      @credentials ||= {}.tap do |options|

        options[:username] = user if user.present?

        options[:password] = password if password.present?

        options[:email] = email if email.present?

      end

    end

  end

end