[elb] Adding support for DescribeInstanceHealth

lib/fog/aws/elb.rb

@@ -5,16 +5,18 @@ module Fog
       def self.new(options={})
 
         unless @required
-          require 'fog/aws/parsers/elb/deregister_instances_from_load_balancer.rb'
+          require 'fog/aws/parsers/elb/deregister_instances_from_load_balancer'
+          require 'fog/aws/parsers/elb/describe_instance_health'
           require 'fog/aws/parsers/elb/describe_load_balancers'
-          require 'fog/aws/parsers/elb/disable_availability_zones_for_load_balancer.rb'
-          require 'fog/aws/parsers/elb/enable_availability_zones_for_load_balancer.rb'
-          require 'fog/aws/parsers/elb/register_instances_with_load_balancer.rb'
-          require 'fog/aws/requests/elb/deregister_instances_from_load_balancer.rb'
+          require 'fog/aws/parsers/elb/disable_availability_zones_for_load_balancer'
+          require 'fog/aws/parsers/elb/enable_availability_zones_for_load_balancer'
+          require 'fog/aws/parsers/elb/register_instances_with_load_balancer'
+          require 'fog/aws/requests/elb/deregister_instances_from_load_balancer'
+          require 'fog/aws/requests/elb/describe_instance_health'
           require 'fog/aws/requests/elb/describe_load_balancers'
-          require 'fog/aws/requests/elb/disable_availability_zones_for_load_balancer.rb'
-          require 'fog/aws/requests/elb/enable_availability_zones_for_load_balancer.rb'
-          require 'fog/aws/requests/elb/register_instances_with_load_balancer.rb'
+          require 'fog/aws/requests/elb/disable_availability_zones_for_load_balancer'
+          require 'fog/aws/requests/elb/enable_availability_zones_for_load_balancer'
+          require 'fog/aws/requests/elb/register_instances_with_load_balancer'
           @required = true
         end
 

lib/fog/aws/parsers/elb/describe_instance_health.rb

@@ -0,0 +1,30 @@
+module Fog
+  module Parsers
+    module AWS
+      module ELB
+
+        class DescribeInstanceHealth < Fog::Parsers::Base
+
+          def reset
+            @response = { 'DescribeInstanceHealthResult' => { 'InstanceStates' => [] }, 'ResponseMetadata' => {} }
+            @instance_state = {}
+          end
+
+          def end_element(name)
+            case name
+            when 'Description', 'State', 'InstanceId', 'ReasonCode'
+              @instance_state[name] = @value
+            when 'member'
+              @response['DescribeInstanceHealthResult']['InstanceStates'] << @instance_state
+              @instance_state = {}
+            when 'RequestId'
+              @response['ResponseMetadata'][name] = @value
+            end
+          end
+
+        end
+
+      end
+    end
+  end
+end

lib/fog/aws/requests/elb/describe_instance_health.rb

@@ -0,0 +1,44 @@
+module Fog
+  module AWS
+    module ELB
+      class Real
+
+        # Get health status for one or more instances on an existing ELB
+        #
+        # ==== Parameters
+        # * lb_name<~String> - Load balancer to check instances health on
+        # * instance_ids<~Array> - Optional list of instance IDs to check
+        #
+        # ==== Returns
+        # * response<~Excon::Response>:
+        #   * body<~Hash>:
+        #     * 'ResponseMetadata'<~Hash>:
+        #       * 'RequestId'<~String> - Id of request
+        #     * 'DescribeInstanceHealthResult'<~Hash>:
+        #       * 'InstanceStates'<~Array> - array of hashes describing instance health
+        #         * 'Description'<~String>
+        #         * 'State'<~String>
+        #         * 'InstanceId'<~String>
+        #         * 'ReasonCode'<~String>
+        def describe_instance_health(lb_name, instance_ids = [])
+          params = ELB.indexed_param('Instances.member.%.InstanceId', [*instance_ids], 1)
+          request({
+            'Action'           => 'DescribeInstanceHealth',
+            'LoadBalancerName' => lb_name,
+            :parser            => Fog::Parsers::AWS::ELB::DescribeInstanceHealth.new
+          }.merge!(params))
+        end
+
+      end
+
+      class Mock
+
+        def describe_instance_health(lb_name, instance_ids = [])
+          raise MockNotImplemented.new("Contributions welcome!")
+        end
+
+      end
+
+    end
+  end
+end