Add ability to get/list snapshots in GCE.

This patch...
1. Adds the Snapshot collection and model
2. Adds the get/list requests
3. adds some examples

lib/fog/google/compute.rb

@@ -19,6 +19,7 @@ module Fog
       request :list_zones
       request :list_global_operations
       request :list_zone_operations
+      request :list_snapshots
 
       request :get_server
       request :get_disk
@@ -27,6 +28,7 @@ module Fog
       request :get_machine_type
       request :get_network
       request :get_zone
+      request :get_snapshot
 
       request :delete_disk
       request :delete_firewall
@@ -56,6 +58,9 @@ module Fog
       model :disk
       collection :disks
 
+      model :snapshot
+      collection :snapshots
+
       class Mock
         include Collections
 

lib/fog/google/examples/get_list_snapshots.rb

@@ -0,0 +1,18 @@
+def test
+
+  connection = Fog::Compute.new({ :provider => "Google" })
+
+  # puts 'Listing images in all projects...'
+  # puts '---------------------------------'
+  snapshots = connection.snapshots.all
+  raise 'Could not LIST the snapshots' unless snapshots
+  # puts snapshots.inspect
+
+  snap = snapshots.first
+  # puts 'Fetching a single image from a global project...'
+  # puts '------------------------------------------------'
+  snap = connection.snapshots.get(snap)
+  raise 'Could not GET the snapshot' unless snap
+  # puts snap.inspect
+
+end

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

@@ -0,0 +1,36 @@
+require 'fog/core/model'
+
+module Fog
+  module Compute
+    class Google
+
+      class Snapshot < Fog::Model
+
+        identity :name
+
+        attribute :kind
+        attribute :self_link         , :aliases => 'selfLink'
+        attribute :creation_timestamp, :aliases => 'creationTimestamp'
+        attribute :disk_size_gb      , :aliases => 'diskSizeGb'
+        attribute :source_disk       , :aliases => 'sourceDisk'
+        attribute :source_disk_id    , :aliases => 'sourceDiskId'
+        attribute :description
+
+        def reload
+          requires :name
+
+          data = service.get_snapshot(name, self.service.project).body
+
+          self.merge_attributes(data)
+          self
+        end
+
+        def resource_url
+          "#{self.project}/global/snapshots/#{name}"
+        end
+
+      end
+
+    end
+  end
+end

lib/fog/google/models/compute/snapshots.rb

@@ -0,0 +1,28 @@
+require 'fog/core/collection'
+require 'fog/google/models/compute/snapshot'
+
+module Fog
+  module Compute
+    class Google
+
+      class Snapshots < Fog::Collection
+
+        model Fog::Compute::Google::Snapshot
+
+        def all
+          data = service.list_snapshots(self.service.project)
+          snapshots = data.body['items'] || []
+          load(snapshots)
+        end
+
+        def get(snap_id)
+          response = service.get_snapshot(snap_id, self.service.project)
+          return nil if response.nil?
+          new(response.body)
+        end
+
+      end
+
+    end
+  end
+end

lib/fog/google/requests/compute/get_snapshot.rb

@@ -0,0 +1,30 @@
+module Fog
+  module Compute
+    class Google
+
+      class Mock
+
+        def get_snapshot(snap_name)
+          Fog::Mock.not_implemented
+        end
+
+      end
+
+      class Real
+
+        def get_snapshot(snap_name, project=@project)
+          api_method = @compute.snapshots.get
+          parameters = {
+            'snapshot' => snap_name,
+            'project'  => project,
+          }
+
+          result = self.build_result(api_method, parameters)
+          response = self.build_response(result)
+        end
+
+      end
+
+    end
+  end
+end

lib/fog/google/requests/compute/list_snapshots.rb

@@ -0,0 +1,30 @@
+module Fog
+  module Compute
+    class Google
+
+      class Mock
+
+        def list_snapshots
+          Fog::Mock.not_implemented
+        end
+
+      end
+
+      class Real
+
+        def list_snapshots(project=nil)
+          api_method = @compute.snapshots.list
+          project=@project if project.nil?
+          parameters = {
+            'project' => project
+          }
+
+          result = self.build_result(api_method, parameters)
+          response = self.build_response(result)
+        end
+
+      end
+
+    end
+  end
+end