Class: DeltaCloud::API

Inherits:
Object
  • Object
show all
Defined in:
lib/deltacloud.rb

Defined Under Namespace

Classes: BackendError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(user_name, password, api_url, opts = {}) {|_self| ... } ⇒ API

Returns a new instance of API.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/deltacloud.rb', line 67

def initialize(user_name, password, api_url, opts={}, &block)
  opts[:version] = true
  @username, @password = user_name, password
  @api_uri = URI.parse(api_url)
  @features, @entry_points = {}, {}
  @verbose = opts[:verbose] || false
  discover_entry_points
  yield self if block_given?
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object

Generate create_* methods dynamically

Raises:

  • (NoMethodError) 


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# File 'lib/deltacloud.rb', line 211

def method_missing(name, *args)
  if name.to_s =~ /create_(\w+)/
    params = args[0] if args[0] and args[0].class.eql?(Hash)
    params ||= args[1] if args[1] and args[1].class.eql?(Hash)
    params ||= {}

    # FIXME: This fixes are related to Instance model and should be
    # replaced by 'native' parameter names

    params[:realm_id] ||= params[:realm] if params[:realm]
    params[:keyname] ||= params[:key_name] if params[:key_name]

    if params[:hardware_profile] and params[:hardware_profile].class.eql?(Hash)
      params[:hardware_profile].each do |k,v|
        params[:"hwp_#{k}"] ||= v
      end
    else
      params[:hwp_id] ||= params[:hardware_profile]
    end

    params[:image_id] ||= params[:image_id] || args[0] if args[0].class!=Hash

    obj = nil

    request(:post, entry_points[:"#{$1}s"], {}, params) do |response|
      obj = base_object(:"#{$1}", response)
      yield obj if block_given?
    end
    return obj
  end
  raise NoMethodError
end

Instance Attribute Details

#api_uri ⇒ Object (readonly)

Returns the value of attribute api_uri.



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# File 'lib/deltacloud.rb', line 65

def api_uri
  @api_uri
end

#api_version ⇒ Object (readonly)

Returns the value of attribute api_version.



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# File 'lib/deltacloud.rb', line 65

def api_version
  @api_version
end

#driver_name ⇒ Object (readonly)

Returns the value of attribute driver_name.



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# File 'lib/deltacloud.rb', line 65

def driver_name
  @driver_name
end

#entry_points ⇒ Object (readonly)

Returns the value of attribute entry_points.



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# File 'lib/deltacloud.rb', line 65

def entry_points
  @entry_points
end

#features ⇒ Object (readonly)

Returns the value of attribute features.



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# File 'lib/deltacloud.rb', line 65

def features
  @features
end

Instance Method Details

#api_host ⇒ Object

Return API hostname



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# File 'lib/deltacloud.rb', line 82

def api_host; @api_uri.host ; end

#api_path ⇒ Object

Return API path



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# File 'lib/deltacloud.rb', line 88

def api_path; @api_uri.path ; end

#api_port ⇒ Object

Return API port



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# File 'lib/deltacloud.rb', line 85

def api_port; @api_uri.port ; end

#base_object(model, response) ⇒ Object

Add default attributes [id and href] to class



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# File 'lib/deltacloud.rb', line 125

def base_object(model, response)
  c = DeltaCloud.add_class("#{model}", DeltaCloud::guess_model_type(response))
  xml_to_class(c, Nokogiri::XML(response).xpath("#{model.to_s.singularize}").first)
end

#base_object_collection(model, response) ⇒ Object 



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# File 'lib/deltacloud.rb', line 118

def base_object_collection(model, response)
  Nokogiri::XML(response).xpath("#{model}/#{model.to_s.singularize}").collect do |item|
    base_object(model, item.to_s)
  end
end

#connect {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/deltacloud.rb', line 77

def connect(&block)
  yield self
end

#declare_entry_points_methods(entry_points) ⇒ Object

Define methods based on ‘rel’ attribute in entry point Two methods are declared: ‘images’ and ‘image’



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# File 'lib/deltacloud.rb', line 92

def declare_entry_points_methods(entry_points)

  API.instance_eval do
    entry_points.keys.select {|k| [:instance_states].include?(k)==false }.each do |model|

      define_method model do |*args|
        request(:get, entry_points[model], args.first) do |response|
          base_object_collection(model, response)
        end
      end

      define_method :"#{model.to_s.singularize}" do |*args|
        request(:get, "#{entry_points[model]}/#{args[0]}") do |response|
          base_object(model, response)
        end
      end

      define_method :"fetch_#{model.to_s.singularize}" do |url|
        id = url.grep(/\/#{model}\/(.*)$/)
        self.send(model.to_s.singularize.to_sym, $1)
      end

    end
  end
end

#discover_entry_points ⇒ Object

Get /api and parse entry points



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# File 'lib/deltacloud.rb', line 188

def discover_entry_points
  return if discovered?
  request(:get, @api_uri.to_s) do |response|
    api_xml = Nokogiri::XML(response)
    @driver_name = api_xml.xpath('/api').first['driver']
    @api_version = api_xml.xpath('/api').first['version']

    api_xml.css("api > link").each do |entry_point|
      rel, href = entry_point['rel'].to_sym, entry_point['href']
      @entry_points.store(rel, href)

      entry_point.css("feature").each do |feature|
        @features[rel] ||= []
        @features[rel] << feature['name'].to_sym

      end
    end
  end
  declare_entry_points_methods(@entry_points)
end

#discovered? ⇒ Boolean

Skip parsing /api when we already got entry points

Returns:

  • (Boolean) 


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# File 'lib/deltacloud.rb', line 332

def discovered?
  true if @entry_points!={}
end

#documentation(collection, operation = nil) ⇒ Object

This method will retrieve API documentation for given collection



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# File 'lib/deltacloud.rb', line 337

def documentation(collection, operation=nil)
  data = {}
  request(:get, "/docs/#{collection}") do |body|
    document = Nokogiri::XML(body)
    if operation
      data[:operation] = operation
      data[:description] = document.xpath('/docs/collection/operations/operation[@name = "'+operation+'"]/description').first.text.strip
      return false unless data[:description]
      data[:params] = []
      (document/"/docs/collection/operations/operation[@name='#{operation}']/parameter").each do |param|
        data[:params] << {
          :name => param['name'],
          :required => param['type'] == 'optional',
          :type => (param/'class').text
        }
      end
    else
      data[:description] = (document/'/docs/collection/description').text
      data[:collection] = collection
      data[:operations] = (document/"/docs/collection/operations/operation").collect{ |o| o['name'] }
    end
  end
  return Documentation.new(self, data)
end

#feature?(collection, name) ⇒ Boolean

Check if specified collection have wanted feature

Returns:

  • (Boolean) 


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# File 'lib/deltacloud.rb', line 304

def feature?(collection, name)
  @features.has_key?(collection) && @features[collection].include?(name)
end

#handle_backend_error(response) ⇒ Object

Raises:



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# File 'lib/deltacloud.rb', line 299

def handle_backend_error(response)
  raise BackendError.new(:message => (Nokogiri::XML(response)/'error/message').text)
end

#instance_state(name) ⇒ Object

Select instance state specified by name



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# File 'lib/deltacloud.rb', line 327

def instance_state(name)
  instance_states.select { |s| s.name.to_s.eql?(name.to_s) }.first
end

#instance_states ⇒ Object

List available instance states and transitions between them



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# File 'lib/deltacloud.rb', line 309

def instance_states
  states = []
  request(:get, entry_points[:instance_states]) do |response|
    Nokogiri::XML(response).xpath('states/state').each do |state_el|
      state = DeltaCloud::InstanceState::State.new(state_el['name'])
      state_el.xpath('transition').each do |transition_el|
        state.transitions << DeltaCloud::InstanceState::Transition.new(
          transition_el['to'],
          transition_el['action']
        )
      end
      states << state
    end
  end
  states
end

#request(*args, &block) ⇒ Object

Basic request method



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# File 'lib/deltacloud.rb', line 246

def request(*args, &block)
  conf = {
    :method => (args[0] || 'get').to_sym,
    :path => (args[1]=~/^http/) ? args[1] : "#{api_uri.to_s}#{args[1]}",
    :query_args => args[2] || {},
    :form_data => args[3] || {}
  }
  if conf[:query_args] != {}
    conf[:path] += '?' + URI.escape(conf[:query_args].collect{ |key, value| "#{key}=#{value}" }.join('&')).to_s
  end

  if conf[:method].eql?(:post)
    RestClient.send(:post, conf[:path], conf[:form_data], default_headers) do |response, request, block|
      handle_backend_error(response) if response.code.eql?(500)
      if response.respond_to?('body')
        yield response.body if block_given?
      else
        yield response.to_s if block_given?
      end
    end
  else
    RestClient.send(conf[:method], conf[:path], default_headers) do |response, request, block|
      handle_backend_error(response) if response.code.eql?(500)
      if conf[:method].eql?(:get) and [301, 302, 307].include? response.code
        response.follow_redirection(request) do |response, request, block|
          if response.respond_to?('body')
            yield response.body if block_given?
          else
            yield response.to_s if block_given?
          end
        end
      else
        if response.respond_to?('body')
          yield response.body if block_given?
        else
          yield response.to_s if block_given?
        end
      end
    end
  end
end

#xml_to_class(base_object, item) ⇒ Object

Convert XML response to defined Ruby Class



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# File 'lib/deltacloud.rb', line 131

def xml_to_class(base_object, item)

  return nil unless item

  params = {
      :id => item['id'],
      :url => item['href'],
      :name => item.name,
      :client => self
  }
  params.merge!({ :initial_state => (item/'state').text.sanitize }) if (item/'state').length > 0

  obj = base_object.new(params)

  # Traverse across XML document and deal with elements
  item.xpath('./*').each do |attribute|

    # Do a link for elements which are links to other REST models
    if self.entry_points.keys.include?(:"#{attribute.name}s")
      obj.add_link!(attribute.name, attribute['id']) && next
    end

    # Do a HWP property for hardware profile properties
    if attribute.name == 'property'
      if attribute['value'] =~ /^(\d+)$/
        obj.add_hwp_property!(attribute['name'], attribute, :float) && next
      else
        obj.add_hwp_property!(attribute['name'], attribute, :integer) && next
      end
    end

    # If there are actions, add they to ActionObject/StateFullObject
    if attribute.name == 'actions'
      (attribute/'link').each do |link|
        obj.add_action_link!(item['id'], link)
      end && next
    end

    if attribute.name == 'mount'
      obj.add_link!("instance", (attribute/"./instance/@id").first.value)
      obj.add_text!("device", (attribute/"./device/@name").first.value)
      next
    end

    # Deal with collections like public-addresses, private-addresses
    if (attribute/'./*').length > 0
      obj.add_collection!(attribute.name, (attribute/'*').collect { |value| value.text }) && next
    end

    # Anything else is treaten as text object
    obj.add_text!(attribute.name, attribute.text.convert)
  end

  return obj
end