bug 1772163: Stop retieving instances by state tag filter on API call

pkg/actuators/machine/actuator.go

@@ -483,14 +483,14 @@ func (a *Actuator) Update(context context.Context, cluster *clusterv1.Cluster, m
 	return a.updateStatus(machine, newestInstance)
 }
 
-// Exists determines if the given machine currently exists. For AWS we query for instances in
-// running state, with a matching name tag, to determine a match.
+// Exists determines if the given machine currently exists.
+// A machine which is not terminated is considered as existing.
 func (a *Actuator) Exists(context context.Context, cluster *clusterv1.Cluster, machine *machinev1.Machine) (bool, error) {
 	glog.Infof("%s: Checking if machine exists", machine.Name)
 
 	instances, err := a.getMachineInstances(cluster, machine)
 	if err != nil {
-		glog.Errorf("%s: Error getting running instances: %v", machine.Name, err)
+		glog.Errorf("%s: Error getting existing instances: %v", machine.Name, err)
 		return false, err
 	}
 	if len(instances) == 0 {
@@ -545,13 +545,11 @@ func (a *Actuator) getMachineInstances(cluster *clusterv1.Cluster, machine *mach
 	// ID, search using that, otherwise fallback to filtering based on tags.
 	if err == nil && status.InstanceID != nil && *status.InstanceID != "" {
 		i, err := getExistingInstanceByID(*status.InstanceID, client)
-
 		if err != nil {
-			glog.Warningf("%s: Failed to find running instance by id %s: %v",
+			glog.Warningf("%s: Failed to find existing instance by id %s: %v",
 				machine.Name, *status.InstanceID, err)
 		} else {
 			glog.Infof("%s: Found instance by id: %s", machine.Name, *status.InstanceID)
-
 			return []*ec2.Instance{i}, nil
 		}
 	}

pkg/actuators/machine/actuator_test.go

@@ -1155,6 +1155,7 @@ func TestGetMachineInstances(t *testing.T) {
 		testcase       string
 		providerStatus providerconfigv1.AWSMachineProviderStatus
 		awsClientFunc  func(*gomock.Controller) awsclient.Client
+		exists         bool
 	}{
 		{
 			testcase:       "empty-status-search-by-tag",
@@ -1170,11 +1171,6 @@ func TestGetMachineInstances(t *testing.T) {
 						},
 
 						clusterFilter(clusterID),
-
-						{
-							Name:   aws.String("instance-state-name"),
-							Values: existingInstanceStates(),
-						},
 					},
 				}
 
@@ -1185,6 +1181,7 @@ func TestGetMachineInstances(t *testing.T) {
 
 				return mockAWSClient
 			},
+			exists: true,
 		},
 		{
 			testcase: "has-status-search-by-id",
@@ -1195,25 +1192,54 @@ func TestGetMachineInstances(t *testing.T) {
 				mockAWSClient := mockaws.NewMockClient(ctrl)
 
 				request := &ec2.DescribeInstancesInput{
+					InstanceIds: aws.StringSlice([]string{instanceID}),
+				}
+
+				mockAWSClient.EXPECT().DescribeInstances(request).Return(
+					stubDescribeInstancesOutput(imageID, instanceID),
+					nil,
+				).Times(1)
+
+				return mockAWSClient
+			},
+			exists: true,
+		},
+		{
+			testcase: "has-status-search-by-id and machine is terminated",
+			providerStatus: providerconfigv1.AWSMachineProviderStatus{
+				InstanceID: aws.String(instanceID),
+			},
+			awsClientFunc: func(ctrl *gomock.Controller) awsclient.Client {
+				mockAWSClient := mockaws.NewMockClient(ctrl)
+
+				request := &ec2.DescribeInstancesInput{
+					InstanceIds: aws.StringSlice([]string{instanceID}),
+				}
+
+				mockAWSClient.EXPECT().DescribeInstances(request).Return(
+					stubTerminatedInstanceDescribeInstancesOutput(imageID, instanceID),
+					nil,
+				).Times(1)
+
+				request2 := &ec2.DescribeInstancesInput{
 					Filters: []*ec2.Filter{
 						{
-							Name:   aws.String("instance-id"),
-							Values: aws.StringSlice([]string{instanceID}),
-						},
-						{
-							Name:   aws.String("instance-state-name"),
-							Values: existingInstanceStates(),
+							Name:   awsTagFilter("Name"),
+							Values: aws.StringSlice([]string{machine.Name}),
 						},
+
+						clusterFilter(clusterID),
 					},
 				}
 
-				mockAWSClient.EXPECT().DescribeInstances(request).Return(
-					stubDescribeInstancesOutput(imageID, instanceID),
+				mockAWSClient.EXPECT().DescribeInstances(request2).Return(
+					stubTerminatedInstanceDescribeInstancesOutput(imageID, instanceID),
 					nil,
 				).Times(1)
 
 				return mockAWSClient
 			},
+			exists: false,
 		},
 	}
 
@@ -1242,10 +1268,13 @@ func TestGetMachineInstances(t *testing.T) {
 				t.Errorf("Error creating Actuator: %v", err)
 			}
 
-			_, err = actuator.getMachineInstances(nil, machineCopy)
+			instance, err := actuator.getMachineInstances(nil, machineCopy)
 			if err != nil {
 				t.Errorf("Unexpected error from getMachineInstances: %v", err)
 			}
+			if tc.exists != (instance != nil) {
+				t.Errorf("Expected instance exists: %t, got instance: %v", tc.exists, instance)
+			}
 		})
 	}
 }

pkg/actuators/machine/stubs.go

@@ -292,3 +292,23 @@ func stubDescribeInstancesOutput(imageID, instanceID string) *ec2.DescribeInstan
 		},
 	}
 }
+
+func stubTerminatedInstanceDescribeInstancesOutput(imageID, instanceID string) *ec2.DescribeInstancesOutput {
+	return &ec2.DescribeInstancesOutput{
+		Reservations: []*ec2.Reservation{
+			{
+				Instances: []*ec2.Instance{
+					{
+						ImageId:    aws.String(imageID),
+						InstanceId: aws.String(instanceID),
+						State: &ec2.InstanceState{
+							Name: aws.String(ec2.InstanceStateNameTerminated),
+							Code: aws.Int64(16),
+						},
+						LaunchTime: aws.Time(time.Now()),
+					},
+				},
+			},
+		},
+	}
+}

pkg/actuators/machine/utils.go

@@ -85,36 +85,47 @@ func getStoppedInstances(machine *machinev1.Machine, client awsclient.Client) ([
 	return getInstances(machine, client, stoppedInstanceStateFilter)
 }
 
+// getExistingInstances returns all instances not terminated
 func getExistingInstances(machine *machinev1.Machine, client awsclient.Client) ([]*ec2.Instance, error) {
-	return getInstances(machine, client, existingInstanceStates())
+	instances, err := getInstances(machine, client, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var existingInstances []*ec2.Instance
+	for key := range instances {
+		if (instances[key].State) != nil {
+			if aws.StringValue(instances[key].State.Name) != ec2.InstanceStateNameTerminated {
+				existingInstances = append(existingInstances, instances[key])
+			}
+		}
+	}
+	return existingInstances, nil
 }
 
 func getExistingInstanceByID(id string, client awsclient.Client) (*ec2.Instance, error) {
-	return getInstanceByID(id, client, existingInstanceStates())
+	instance, err := getInstanceByID(id, client)
+	if err != nil {
+		return nil, err
+	}
+	if instance.State != nil {
+		if aws.StringValue(instance.State.Name) == ec2.InstanceStateNameTerminated {
+			return nil, fmt.Errorf("failed to getExistingInstanceByID for instance-id %s, instance is terminated", id)
+		}
+	}
+	return instance, nil
 }
 
 // getInstanceByID returns the instance with the given ID if it exists.
-func getInstanceByID(id string, client awsclient.Client, instanceStateFilter []*string) (*ec2.Instance, error) {
+func getInstanceByID(id string, client awsclient.Client) (*ec2.Instance, error) {
 	if id == "" {
 		return nil, fmt.Errorf("instance-id not specified")
 	}
 
-	requestFilters := []*ec2.Filter{
-		{
-			Name:   aws.String("instance-id"),
-			Values: aws.StringSlice([]string{id}),
-		},
-	}
-
-	if instanceStateFilter != nil {
-		requestFilters = append(requestFilters, &ec2.Filter{
-			Name:   aws.String("instance-state-name"),
-			Values: instanceStateFilter,
-		})
+	request := &ec2.DescribeInstancesInput{
+		InstanceIds: aws.StringSlice([]string{id}),
 	}
 
-	request := &ec2.DescribeInstancesInput{Filters: requestFilters}
-
 	result, err := client.DescribeInstances(request)
 	if err != nil {
 		return nil, err
@@ -136,7 +147,6 @@ func getInstanceByID(id string, client awsclient.Client, instanceStateFilter []*
 // getInstances returns all instances that have a tag matching our machine name,
 // and cluster ID.
 func getInstances(machine *machinev1.Machine, client awsclient.Client, instanceStateFilter []*string) ([]*ec2.Instance, error) {
-
 	clusterID, ok := getClusterID(machine)
 	if !ok {
 		return []*ec2.Instance{}, fmt.Errorf("unable to get cluster ID for machine: %q", machine.Name)
@@ -149,7 +159,6 @@ func getInstances(machine *machinev1.Machine, client awsclient.Client, instanceS
 		},
 		clusterFilter(clusterID),
 	}
-
 	if instanceStateFilter != nil {
 		requestFilters = append(requestFilters, &ec2.Filter{
 			Name:   aws.String("instance-state-name"),