[core] Deprecates 'connection' accessor

The 'connection' accessor in collections and models actually refered to
a subclassed instance of Fog::Service which creates confusion in the
code.

References to 'connection' could have meant the service or the
Fog::Connection held within that service.

This deprecates the connection accessor and replaces it with `#service`
as a read only value. When a collection or model is initalised then
service should be passed.

This commit also updates all the changes to @connection made by
providers in model initialisers since these depending on the presence of
the 'connection' key. The key is still accepted by outputs a warning.

lib/fog/atmos/models/storage/directory.rb

@@ -12,25 +12,25 @@ module Fog
         def files
           @files ||= begin
                        Fog::Storage::Atmos::Files.new(
-                                                          :directory    => self,
-                                                          :connection   => connection
-                                                          )
-          end
+                         :directory => self,
+                         :service   => service
+                       )
+                     end
         end
 
         def directories
           @directories ||= begin
-                       Fog::Storage::Atmos::Directories.new(
-                                                               :directory    => self,
-                                                               :connection   => connection
-                                                               )
-          end
+                             Fog::Storage::Atmos::Directories.new(
+                               :directory => self,
+                               :service   => service
+                             )
+                           end
         end
 
         def save
           self.key = attributes[:directory].key + key if attributes[:directory]
           self.key = key + '/' unless key =~ /\/$/
-          res = connection.post_namespace key
+          res = service.post_namespace key
           reload
         end
 
@@ -42,7 +42,7 @@ module Fog
               d.destroy(opts)
             end
           end
-          connection.delete_namespace key
+          service.delete_namespace key
         end
 
 

lib/fog/aws/models/compute/server.rb

@@ -53,9 +53,13 @@ module Fog
         def initialize(attributes={})
           self.groups     ||= ["default"] unless (attributes[:subnet_id] || attributes[:security_group_ids])
           self.flavor_id  ||= 't1.micro'
+
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
+
           self.image_id   ||= begin
             self.username = 'ubuntu'
-            case attributes[:connection].instance_variable_get(:@region) # Ubuntu 10.04 LTS 64bit (EBS)
+            case @service.instance_variable_get(:@region) # Ubuntu 10.04 LTS 64bit (EBS)
             when 'ap-northeast-1'
               'ami-5e0fa45f'
             when 'ap-southeast-1'

lib/fog/aws/models/compute/spot_request.rb

@@ -43,7 +43,11 @@ module Fog
           self.flavor_id ||= 't1.micro'
           self.image_id   ||= begin
             self.username = 'ubuntu'
-            case attributes[:connection].instance_variable_get(:@region) # Ubuntu 10.04 LTS 64bit (EBS)
+
+            # Old 'connection' is renamed as service and should be used instead
+            prepare_service_value(attributes)
+
+            case @service.instance_variable_get(:@region) # Ubuntu 10.04 LTS 64bit (EBS)
             when 'ap-northeast-1'
               'ami-5e0fa45f'
             when 'ap-southeast-1'

lib/fog/core/attributes.rb

@@ -194,7 +194,7 @@ module Fog
 
       def missing_attributes(args)
         missing = []
-        for arg in [:connection] | args
+        for arg in [:service] | args
           unless send("#{arg}") || attributes.has_key?(arg)
             missing << arg
           end

lib/fog/core/collection.rb

@@ -1,8 +1,12 @@
+require "fog/core/deprecated_connection_accessors"
+
 module Fog
   class Collection < Array
-
     extend Fog::Attributes::ClassMethods
     include Fog::Attributes::InstanceMethods
+    include Fog::Core::DeprecatedConnectionAccessors
+
+    attr_reader :service
 
     Array.public_instance_methods(false).each do |method|
       unless [:reject, :select, :slice].include?(method.to_sym)
@@ -37,8 +41,6 @@ module Fog
       end
     end
 
-    attr_accessor :connection
-
     remove_method :clear
     def clear
       @loaded = true
@@ -56,11 +58,20 @@ module Fog
       object.destroy
     end
 
+    # Creates a new Fog::Collection based around the passed service
+    #
+    # @param [Hash] attributes
+    # @option attributes [Fog::Service] service Instance of a service
+    #
+    # @return [Fog::Collection]
+    #
     def initialize(attributes = {})
+      @service = attributes.delete(:service)
       @loaded = false
       merge_attributes(attributes)
     end
 
+
     remove_method :inspect
     def inspect
       Thread.current[:formatador] ||= Formatador.new
@@ -105,7 +116,7 @@ module Fog
       model.new(
         {
           :collection => self,
-          :connection => connection
+          :service => service
         }.merge(attributes)
       )
     end

lib/fog/core/deprecated_connection_accessors.rb

@@ -0,0 +1,41 @@
+module Fog
+  module Core
+    # This module covers the shared code used by models and collections
+    # that deprecates the confusing usage of 'connection' which was
+    # actually intended to be an instance of Fog::Service
+    module DeprecatedConnectionAccessors
+      # Sets the Service but using the wrong name!
+      #
+      # @deprecated The connection name was wrong and confusing since it refered to the service
+      # @param [Fog::Service] service An instance of a Fog service this collection is for
+      #
+      def connection=(service)
+        Fog::Logger.deprecation("#connection= is deprecated, pass :service in at creation [light_black](#{caller.first})[/]")
+        @service = service
+      end
+
+      # Returns the Service the collection is part of
+      #
+      # @deprecated #connection is deprecated due to confusing name, use #service instead
+      # @return [Fog::Service]
+      #
+      def connection
+        Fog::Logger.deprecation("#connection is deprecated, use #service instead [light_black](#{caller.first})[/]")
+        @service
+      end
+
+      # Prepares the value of the service based on the passed attributes
+      #
+      # @note Intended for use where the service is required before the normal
+      #   initializer runs. The logic is run there with deprecation warnings.
+      #
+      # @param [Hash] attributes
+      # @return [Fog::Service]
+      #
+      def prepare_service_value(attributes)
+        @service = attributes[:service] || attributes[:connection]
+      end
+
+    end
+  end
+end

lib/fog/core/model.rb

@@ -1,12 +1,22 @@
+require "fog/core/deprecated_connection_accessors"
+
 module Fog
   class Model
 
     extend Fog::Attributes::ClassMethods
     include Fog::Attributes::InstanceMethods
+    include Fog::Core::DeprecatedConnectionAccessors
 
-    attr_accessor :collection, :connection
+    attr_accessor :collection
+    attr_reader :service
 
     def initialize(new_attributes = {})
+      # TODO Remove compatibility with old connection option
+      @service = @service || new_attributes.delete(:service)
+      if @service.nil? && new_attributes[:connection]
+        Fog::Logger.deprecation("Passing :connection option is deprecated, use :service instead [light_black](#{caller.first})[/]")
+        @service = new_attributes[:connection]
+      end
       merge_attributes(new_attributes)
     end
 

lib/fog/core/service.rb

@@ -91,7 +91,7 @@ module Fog
             constant = collection.to_s.split('_').map {|characters| characters[0...1].upcase << characters[1..-1]}.join('')
             service::Collections.module_eval <<-EOS, __FILE__, __LINE__
               def #{collection}(attributes = {})
-                #{service}::#{constant}.new({:connection => self}.merge(attributes))
+                #{service}::#{constant}.new({:service => self}.merge(attributes))
               end
             EOS
           end

lib/fog/openstack/models/compute/flavor.rb

@@ -18,7 +18,8 @@ module Fog
         attribute :disabled, :aliases => 'OS-FLV-DISABLED:disabled'
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/compute/host.rb

@@ -12,7 +12,8 @@ module Fog
         attribute :details
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/compute/image.rb

@@ -21,7 +21,8 @@ module Fog
         attribute :links
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/compute/server.rb

@@ -44,7 +44,8 @@ module Fog
 
 
         def initialize(attributes={})
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           attributes[:metadata] = {}
 
           self.security_groups = attributes.delete(:security_groups)

lib/fog/openstack/models/compute/snapshot.rb

@@ -18,7 +18,8 @@ module Fog
 
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/compute/volume.rb

@@ -21,7 +21,8 @@ module Fog
 
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/identity/ec2_credential.rb

@@ -11,7 +11,8 @@ module Fog
         attribute :user_id
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/identity/user.rb

@@ -15,7 +15,8 @@ module Fog
         attr_accessor :email, :name, :tenant_id, :enabled, :password
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/image/image.rb

@@ -32,7 +32,8 @@ module Fog
 
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/openstack/models/network/network.rb

@@ -14,7 +14,8 @@ module Fog
         attribute :tenant_id
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 
@@ -43,4 +44,4 @@ module Fog
       end
     end
   end
-end
+end

lib/fog/openstack/models/network/port.rb

@@ -17,7 +17,8 @@ module Fog
         attribute :tenant_id
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 
@@ -49,4 +50,4 @@ module Fog
       end
     end
   end
-end
+end

lib/fog/openstack/models/network/subnet.rb

@@ -18,7 +18,8 @@ module Fog
         attribute :tenant_id
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 
@@ -52,4 +53,4 @@ module Fog
       end
     end
   end
-end
+end

lib/fog/openstack/models/volume/volume.rb

@@ -20,7 +20,8 @@ module Fog
 
 
         def initialize(attributes)
-          @connection = attributes[:connection]
+          # Old 'connection' is renamed as service and should be used instead
+          prepare_service_value(attributes)
           super
         end
 

lib/fog/rackspace/models/load_balancers/load_balancer.rb

@@ -29,8 +29,9 @@ module Fog
         attribute :nodes
 
         def initialize(attributes)
-          #HACK - Since we are hacking how sub-collections work, we have to make sure the connection is valid first.
-          @connection = attributes[:connection]
+          #HACK - Since we are hacking how sub-collections work, we have to make sure the service is valid first.
+          # Old 'connection' is renamed as service and should be used instead
+          @service = attributes[:service] || attributes[:connection]
           super
         end