package aws import ( "fmt" "log" "strings" "time" "github.com/hashicorp/terraform/helper/resource" "github.com/hashicorp/terraform/helper/schema" "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/aws/awserr" "github.com/aws/aws-sdk-go/service/autoscaling" "github.com/aws/aws-sdk-go/service/elb" ) func resourceAwsAutoscalingGroup() *schema.Resource { return &schema.Resource{ Create: resourceAwsAutoscalingGroupCreate, Read: resourceAwsAutoscalingGroupRead, Update: resourceAwsAutoscalingGroupUpdate, Delete: resourceAwsAutoscalingGroupDelete, Schema: map[string]*schema.Schema{ "name": &schema.Schema{ Type: schema.TypeString, Required: true, ForceNew: true, }, "launch_configuration": &schema.Schema{ Type: schema.TypeString, Required: true, }, "desired_capacity": &schema.Schema{ Type: schema.TypeInt, Optional: true, Computed: true, }, "min_elb_capacity": &schema.Schema{ Type: schema.TypeInt, Optional: true, }, "min_size": &schema.Schema{ Type: schema.TypeInt, Required: true, }, "max_size": &schema.Schema{ Type: schema.TypeInt, Required: true, }, "default_cooldown": &schema.Schema{ Type: schema.TypeInt, Optional: true, Computed: true, ForceNew: true, }, "force_delete": &schema.Schema{ Type: schema.TypeBool, Optional: true, Computed: true, ForceNew: true, }, "health_check_grace_period": &schema.Schema{ Type: schema.TypeInt, Optional: true, Computed: true, }, "health_check_type": &schema.Schema{ Type: schema.TypeString, Optional: true, Computed: true, }, "availability_zones": &schema.Schema{ Type: schema.TypeSet, Required: true, ForceNew: true, Elem: &schema.Schema{Type: schema.TypeString}, Set: schema.HashString, }, "load_balancers": &schema.Schema{ Type: schema.TypeSet, Optional: true, ForceNew: true, Elem: &schema.Schema{Type: schema.TypeString}, Set: schema.HashString, }, "vpc_zone_identifier": &schema.Schema{ Type: schema.TypeSet, Optional: true, Computed: true, ForceNew: true, Elem: &schema.Schema{Type: schema.TypeString}, Set: schema.HashString, }, "termination_policies": &schema.Schema{ Type: schema.TypeSet, Optional: true, Computed: true, ForceNew: true, Elem: &schema.Schema{Type: schema.TypeString}, Set: schema.HashString, }, "tag": autoscalingTagsSchema(), }, } } func resourceAwsAutoscalingGroupCreate(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).autoscalingconn var autoScalingGroupOpts autoscaling.CreateAutoScalingGroupInput autoScalingGroupOpts.AutoScalingGroupName = aws.String(d.Get("name").(string)) autoScalingGroupOpts.LaunchConfigurationName = aws.String(d.Get("launch_configuration").(string)) autoScalingGroupOpts.MinSize = aws.Long(int64(d.Get("min_size").(int))) autoScalingGroupOpts.MaxSize = aws.Long(int64(d.Get("max_size").(int))) autoScalingGroupOpts.AvailabilityZones = expandStringList( d.Get("availability_zones").(*schema.Set).List()) if v, ok := d.GetOk("tag"); ok { autoScalingGroupOpts.Tags = autoscalingTagsFromMap( setToMapByKey(v.(*schema.Set), "key"), d.Get("name").(string)) } if v, ok := d.GetOk("default_cooldown"); ok { autoScalingGroupOpts.DefaultCooldown = aws.Long(int64(v.(int))) } if v, ok := d.GetOk("health_check_type"); ok && v.(string) != "" { autoScalingGroupOpts.HealthCheckType = aws.String(v.(string)) } if v, ok := d.GetOk("desired_capacity"); ok { autoScalingGroupOpts.DesiredCapacity = aws.Long(int64(v.(int))) } if v, ok := d.GetOk("health_check_grace_period"); ok { autoScalingGroupOpts.HealthCheckGracePeriod = aws.Long(int64(v.(int))) } if v, ok := d.GetOk("load_balancers"); ok && v.(*schema.Set).Len() > 0 { autoScalingGroupOpts.LoadBalancerNames = expandStringList( v.(*schema.Set).List()) } if v, ok := d.GetOk("vpc_zone_identifier"); ok && v.(*schema.Set).Len() > 0 { exp := expandStringList(v.(*schema.Set).List()) strs := make([]string, len(exp)) for _, s := range exp { strs = append(strs, *s) } autoScalingGroupOpts.VPCZoneIdentifier = aws.String(strings.Join(strs, ",")) } if v, ok := d.GetOk("termination_policies"); ok && v.(*schema.Set).Len() > 0 { autoScalingGroupOpts.TerminationPolicies = expandStringList( v.(*schema.Set).List()) } log.Printf("[DEBUG] AutoScaling Group create configuration: %#v", autoScalingGroupOpts) _, err := conn.CreateAutoScalingGroup(&autoScalingGroupOpts) if err != nil { return fmt.Errorf("Error creating Autoscaling Group: %s", err) } d.SetId(d.Get("name").(string)) log.Printf("[INFO] AutoScaling Group ID: %s", d.Id()) if err := waitForASGCapacity(d, meta); err != nil { return err } return resourceAwsAutoscalingGroupRead(d, meta) } func resourceAwsAutoscalingGroupRead(d *schema.ResourceData, meta interface{}) error { g, err := getAwsAutoscalingGroup(d, meta) if err != nil { return err } if g == nil { return nil } d.Set("availability_zones", g.AvailabilityZones) d.Set("default_cooldown", g.DefaultCooldown) d.Set("desired_capacity", g.DesiredCapacity) d.Set("health_check_grace_period", g.HealthCheckGracePeriod) d.Set("health_check_type", g.HealthCheckType) d.Set("launch_configuration", g.LaunchConfigurationName) d.Set("load_balancers", g.LoadBalancerNames) d.Set("min_size", g.MinSize) d.Set("max_size", g.MaxSize) d.Set("name", g.AutoScalingGroupName) d.Set("tag", g.Tags) d.Set("vpc_zone_identifier", strings.Split(*g.VPCZoneIdentifier, ",")) d.Set("termination_policies", g.TerminationPolicies) return nil } func resourceAwsAutoscalingGroupUpdate(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).autoscalingconn opts := autoscaling.UpdateAutoScalingGroupInput{ AutoScalingGroupName: aws.String(d.Id()), } if d.HasChange("desired_capacity") { opts.DesiredCapacity = aws.Long(int64(d.Get("desired_capacity").(int))) } if d.HasChange("launch_configuration") { opts.LaunchConfigurationName = aws.String(d.Get("launch_configuration").(string)) } if d.HasChange("min_size") { opts.MinSize = aws.Long(int64(d.Get("min_size").(int))) } if d.HasChange("max_size") { opts.MaxSize = aws.Long(int64(d.Get("max_size").(int))) } if d.HasChange("health_check_grace_period") { opts.HealthCheckGracePeriod = aws.Long(int64(d.Get("health_check_grace_period").(int))) } if d.HasChange("health_check_type") { opts.HealthCheckGracePeriod = aws.Long(int64(d.Get("health_check_grace_period").(int))) opts.HealthCheckType = aws.String(d.Get("health_check_type").(string)) } if err := setAutoscalingTags(conn, d); err != nil { return err } else { d.SetPartial("tag") } log.Printf("[DEBUG] AutoScaling Group update configuration: %#v", opts) _, err := conn.UpdateAutoScalingGroup(&opts) if err != nil { d.Partial(true) return fmt.Errorf("Error updating Autoscaling group: %s", err) } return resourceAwsAutoscalingGroupRead(d, meta) } func resourceAwsAutoscalingGroupDelete(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).autoscalingconn // Read the autoscaling group first. If it doesn't exist, we're done. // We need the group in order to check if there are instances attached. // If so, we need to remove those first. g, err := getAwsAutoscalingGroup(d, meta) if err != nil { return err } if g == nil { return nil } if len(g.Instances) > 0 || *g.DesiredCapacity > 0 { if err := resourceAwsAutoscalingGroupDrain(d, meta); err != nil { return err } } log.Printf("[DEBUG] AutoScaling Group destroy: %v", d.Id()) deleteopts := autoscaling.DeleteAutoScalingGroupInput{AutoScalingGroupName: aws.String(d.Id())} // You can force an autoscaling group to delete // even if it's in the process of scaling a resource. // Normally, you would set the min-size and max-size to 0,0 // and then delete the group. This bypasses that and leaves // resources potentially dangling. if d.Get("force_delete").(bool) { deleteopts.ForceDelete = aws.Boolean(true) } // We retry the delete operation to handle InUse/InProgress errors coming // from scaling operations. We should be able to sneak in a delete in between // scaling operations within 5m. err = resource.Retry(5*time.Minute, func() error { if _, err := conn.DeleteAutoScalingGroup(&deleteopts); err != nil { if awserr, ok := err.(awserr.Error); ok { switch awserr.Code() { case "InvalidGroup.NotFound": // Already gone? Sure! return nil case "ResourceInUse", "ScalingActivityInProgress": // These are retryable return awserr } } // Didn't recognize the error, so shouldn't retry. return resource.RetryError{Err: err} } // Successful delete return nil }) if err != nil { return err } return resource.Retry(5*time.Minute, func() error { if g, _ = getAwsAutoscalingGroup(d, meta); g != nil { return fmt.Errorf("Auto Scaling Group still exists") } return nil }) } func getAwsAutoscalingGroup( d *schema.ResourceData, meta interface{}) (*autoscaling.Group, error) { conn := meta.(*AWSClient).autoscalingconn describeOpts := autoscaling.DescribeAutoScalingGroupsInput{ AutoScalingGroupNames: []*string{aws.String(d.Id())}, } log.Printf("[DEBUG] AutoScaling Group describe configuration: %#v", describeOpts) describeGroups, err := conn.DescribeAutoScalingGroups(&describeOpts) if err != nil { autoscalingerr, ok := err.(awserr.Error) if ok && autoscalingerr.Code() == "InvalidGroup.NotFound" { d.SetId("") return nil, nil } return nil, fmt.Errorf("Error retrieving AutoScaling groups: %s", err) } // Search for the autoscaling group for idx, asc := range describeGroups.AutoScalingGroups { if *asc.AutoScalingGroupName == d.Id() { return describeGroups.AutoScalingGroups[idx], nil } } // ASG not found d.SetId("") return nil, nil } func resourceAwsAutoscalingGroupDrain(d *schema.ResourceData, meta interface{}) error { conn := meta.(*AWSClient).autoscalingconn // First, set the capacity to zero so the group will drain log.Printf("[DEBUG] Reducing autoscaling group capacity to zero") opts := autoscaling.UpdateAutoScalingGroupInput{ AutoScalingGroupName: aws.String(d.Id()), DesiredCapacity: aws.Long(0), MinSize: aws.Long(0), MaxSize: aws.Long(0), } if _, err := conn.UpdateAutoScalingGroup(&opts); err != nil { return fmt.Errorf("Error setting capacity to zero to drain: %s", err) } // Next, wait for the autoscale group to drain log.Printf("[DEBUG] Waiting for group to have zero instances") return resource.Retry(10*time.Minute, func() error { g, err := getAwsAutoscalingGroup(d, meta) if err != nil { return resource.RetryError{Err: err} } if g == nil { return nil } if len(g.Instances) == 0 { return nil } return fmt.Errorf("group still has %d instances", len(g.Instances)) }) } var waitForASGCapacityTimeout = 10 * time.Minute // Waits for a minimum number of healthy instances to show up as healthy in the // ASG before continuing. Waits up to `waitForASGCapacityTimeout` for // "desired_capacity", or "min_size" if desired capacity is not specified. // // If "min_elb_capacity" is specified, will also wait for that number of // instances to show up InService in all attached ELBs. See "Waiting for // Capacity" in docs for more discussion of the feature. func waitForASGCapacity(d *schema.ResourceData, meta interface{}) error { wantASG := d.Get("min_size").(int) if v := d.Get("desired_capacity").(int); v > 0 { wantASG = v } wantELB := d.Get("min_elb_capacity").(int) log.Printf("[DEBUG] Waiting for capacity: %d ASG, %d ELB", wantASG, wantELB) return resource.Retry(waitForASGCapacityTimeout, func() error { g, err := getAwsAutoscalingGroup(d, meta) if err != nil { return resource.RetryError{Err: err} } if g == nil { return nil } lbis, err := getLBInstanceStates(g, meta) if err != nil { return resource.RetryError{Err: err} } haveASG := 0 haveELB := 0 for _, i := range g.Instances { if i.HealthStatus == nil || i.InstanceID == nil || i.LifecycleState == nil { continue } if !strings.EqualFold(*i.HealthStatus, "Healthy") { continue } if !strings.EqualFold(*i.LifecycleState, "InService") { continue } haveASG++ if wantELB > 0 { inAllLbs := true for _, states := range lbis { state, ok := states[*i.InstanceID] if !ok || !strings.EqualFold(state, "InService") { inAllLbs = false } } if inAllLbs { haveELB++ } } } log.Printf("[DEBUG] %q Capacity: %d/%d ASG, %d/%d ELB", d.Id(), haveASG, wantASG, haveELB, wantELB) if haveASG >= wantASG && haveELB >= wantELB { return nil } return fmt.Errorf("Still need to wait for more healthy instances. This could mean instances failed to launch. See Scaling History for more information.") }) } // Returns a mapping of the instance states of all the ELBs attached to the // provided ASG. // // Nested like: lbName -> instanceId -> instanceState func getLBInstanceStates(g *autoscaling.Group, meta interface{}) (map[string]map[string]string, error) { lbInstanceStates := make(map[string]map[string]string) elbconn := meta.(*AWSClient).elbconn for _, lbName := range g.LoadBalancerNames { lbInstanceStates[*lbName] = make(map[string]string) opts := &elb.DescribeInstanceHealthInput{LoadBalancerName: lbName} r, err := elbconn.DescribeInstanceHealth(opts) if err != nil { return nil, err } for _, is := range r.InstanceStates { if is.InstanceID == nil || is.State == nil { continue } lbInstanceStates[*lbName][*is.InstanceID] = *is.State } } return lbInstanceStates, nil }