add quick_stats support for RHEVM host

app/models/host.rb

@@ -1297,7 +1297,7 @@ def set_custom_field(attribute, value)
 
   def quickStats
     return @qs if @qs
-    return {} unless is_vmware?
+    return {} unless supports_quick_stats?
 
     begin
       raise _("Host has no EMS, unable to get host statistics") unless ext_management_system

app/models/manageiq/providers/redhat/infra_manager.rb

@@ -49,6 +49,19 @@ def self.event_monitor_class
     self::EventCatcher
   end
 
+  def host_quick_stats(host)
+    qs = {}
+    with_provider_connection(:version => 4) do |connection|
+      stats_list = connection.system_service.hosts_service.host_service(host.uid_ems)
+                             .statistics_service.list
+      qs["overallMemoryUsage"] = stats_list.detect { |x| x.name == "memory.used" }
+                                           .values.first.datum
+      qs["overallCpuUsage"] = stats_list.detect { |x| x.name == "cpu.load.avg.5m" }
+                                        .values.first.datum
+    end
+    qs
+  end
+
   def self.provision_class(via)
     case via
     when "iso" then self::ProvisionViaIso

app/models/manageiq/providers/redhat/infra_manager/api_integration.rb

@@ -211,7 +211,7 @@ def api3_supported_features
     end
 
     def api4_supported_features
-      [:snapshots]
+      [:quick_stats, :snapshots]
     end
 
     def api_features

app/models/manageiq/providers/redhat/infra_manager/host.rb

@@ -17,4 +17,10 @@ def verify_credentials(auth_type = nil, options = {})
 
     true
   end
+
+  supports :quick_stats do
+    unless ext_management_system.supports_quick_stats?
+      unsupported_reason_add(:quick_stats, 'RHV API version does not support quick_stats')
+    end
+  end
 end

app/models/manageiq/providers/vmware/infra_manager/host.rb

@@ -66,4 +66,6 @@ def reserve_next_available_vnc_port
       port
     end
   end
+
+  supports :quick_stats
 end

app/models/manageiq/providers/vmware/infra_manager/vm.rb

@@ -27,4 +27,6 @@ def cloneable?
   def supports_snapshots?
     true
   end
+
+  supports :quick_stats
 end

app/models/mixins/supports_feature_mixin.rb

@@ -81,6 +81,7 @@ module SupportsFeatureMixin
     :live_migrate               => 'Live Migration',
     :migrate                    => 'Migration',
     :provisioning               => 'Provisioning',
+    :quick_stats                => 'Quick Stats',
     :reboot_guest               => 'Reboot Guest Operation',
     :reconfigure                => 'Reconfiguration',
     :refresh_network_interfaces => 'Refresh Network Interfaces for a Host',

spec/models/manageiq/providers/redhat/infra_manager/host_spec.rb

@@ -0,0 +1,19 @@
+describe ManageIQ::Providers::Redhat::InfraManager::Host do
+  require 'ovirtsdk4'
+  describe '#quickStats' do
+    let(:ems) { FactoryGirl.create(:ems_redhat_with_authentication) }
+    subject { FactoryGirl.create(:host_redhat, :ems_id => ems.id) }
+    before(:each) do
+      allow_any_instance_of(ManageIQ::Providers::Redhat::InfraManager)
+        .to receive(:supported_api_versions).and_return([4])
+    end
+    it '.supports_quick_stats?' do
+      expect(subject.supports_quick_stats?).to be true
+    end
+
+    it 'calls list on StatisticsService' do
+      expect_any_instance_of(OvirtSDK4::StatisticsService).to receive(:list)
+      subject.quickStats
+    end
+  end
+end