605 lines
17 KiB
Go
605 lines
17 KiB
Go
package aws
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import (
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"fmt"
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"log"
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"strings"
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"time"
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"github.com/hashicorp/terraform/helper/resource"
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"github.com/hashicorp/terraform/helper/schema"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/service/autoscaling"
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"github.com/aws/aws-sdk-go/service/elb"
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)
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func resourceAwsAutoscalingGroup() *schema.Resource {
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return &schema.Resource{
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Create: resourceAwsAutoscalingGroupCreate,
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Read: resourceAwsAutoscalingGroupRead,
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Update: resourceAwsAutoscalingGroupUpdate,
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Delete: resourceAwsAutoscalingGroupDelete,
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Schema: map[string]*schema.Schema{
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"name": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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Computed: true,
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ForceNew: true,
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ValidateFunc: func(v interface{}, k string) (ws []string, errors []error) {
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// https://github.com/boto/botocore/blob/9f322b1/botocore/data/autoscaling/2011-01-01/service-2.json#L1862-L1873
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value := v.(string)
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if len(value) > 255 {
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errors = append(errors, fmt.Errorf(
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"%q cannot be longer than 255 characters", k))
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}
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return
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},
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},
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"launch_configuration": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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"desired_capacity": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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Computed: true,
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},
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"min_elb_capacity": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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},
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"min_size": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"max_size": &schema.Schema{
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Type: schema.TypeInt,
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Required: true,
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},
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"default_cooldown": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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Computed: true,
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},
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"force_delete": &schema.Schema{
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Type: schema.TypeBool,
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Optional: true,
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Default: false,
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},
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"health_check_grace_period": &schema.Schema{
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Type: schema.TypeInt,
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Optional: true,
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Computed: true,
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},
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"health_check_type": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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Computed: true,
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},
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"availability_zones": &schema.Schema{
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Type: schema.TypeSet,
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Optional: true,
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Elem: &schema.Schema{Type: schema.TypeString},
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Set: schema.HashString,
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},
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"load_balancers": &schema.Schema{
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Type: schema.TypeSet,
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Optional: true,
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Elem: &schema.Schema{Type: schema.TypeString},
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Set: schema.HashString,
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},
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"vpc_zone_identifier": &schema.Schema{
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Type: schema.TypeSet,
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Optional: true,
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Computed: true,
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Elem: &schema.Schema{Type: schema.TypeString},
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Set: schema.HashString,
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},
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"termination_policies": &schema.Schema{
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Type: schema.TypeList,
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Optional: true,
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Elem: &schema.Schema{Type: schema.TypeString},
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},
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"wait_for_capacity_timeout": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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Default: "10m",
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ValidateFunc: func(v interface{}, k string) (ws []string, errors []error) {
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value := v.(string)
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duration, err := time.ParseDuration(value)
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if err != nil {
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errors = append(errors, fmt.Errorf(
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"%q cannot be parsed as a duration: %s", k, err))
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}
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if duration < 0 {
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errors = append(errors, fmt.Errorf(
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"%q must be greater than zero", k))
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}
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return
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},
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},
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"tag": autoscalingTagsSchema(),
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},
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}
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}
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func resourceAwsAutoscalingGroupCreate(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).autoscalingconn
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var autoScalingGroupOpts autoscaling.CreateAutoScalingGroupInput
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var asgName string
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if v, ok := d.GetOk("name"); ok {
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asgName = v.(string)
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} else {
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asgName = resource.PrefixedUniqueId("tf-asg-")
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d.Set("name", asgName)
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}
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autoScalingGroupOpts.AutoScalingGroupName = aws.String(asgName)
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autoScalingGroupOpts.LaunchConfigurationName = aws.String(d.Get("launch_configuration").(string))
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autoScalingGroupOpts.MinSize = aws.Int64(int64(d.Get("min_size").(int)))
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autoScalingGroupOpts.MaxSize = aws.Int64(int64(d.Get("max_size").(int)))
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// Availability Zones are optional if VPC Zone Identifer(s) are specified
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if v, ok := d.GetOk("availability_zones"); ok && v.(*schema.Set).Len() > 0 {
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autoScalingGroupOpts.AvailabilityZones = expandStringList(v.(*schema.Set).List())
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}
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if v, ok := d.GetOk("tag"); ok {
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autoScalingGroupOpts.Tags = autoscalingTagsFromMap(
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setToMapByKey(v.(*schema.Set), "key"), d.Get("name").(string))
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}
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if v, ok := d.GetOk("default_cooldown"); ok {
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autoScalingGroupOpts.DefaultCooldown = aws.Int64(int64(v.(int)))
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}
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if v, ok := d.GetOk("health_check_type"); ok && v.(string) != "" {
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autoScalingGroupOpts.HealthCheckType = aws.String(v.(string))
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}
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if v, ok := d.GetOk("desired_capacity"); ok {
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autoScalingGroupOpts.DesiredCapacity = aws.Int64(int64(v.(int)))
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}
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if v, ok := d.GetOk("health_check_grace_period"); ok {
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autoScalingGroupOpts.HealthCheckGracePeriod = aws.Int64(int64(v.(int)))
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}
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if v, ok := d.GetOk("load_balancers"); ok && v.(*schema.Set).Len() > 0 {
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autoScalingGroupOpts.LoadBalancerNames = expandStringList(
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v.(*schema.Set).List())
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}
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if v, ok := d.GetOk("vpc_zone_identifier"); ok && v.(*schema.Set).Len() > 0 {
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autoScalingGroupOpts.VPCZoneIdentifier = expandVpcZoneIdentifiers(v.(*schema.Set).List())
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}
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if v, ok := d.GetOk("termination_policies"); ok && len(v.([]interface{})) > 0 {
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autoScalingGroupOpts.TerminationPolicies = expandStringList(v.([]interface{}))
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}
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log.Printf("[DEBUG] AutoScaling Group create configuration: %#v", autoScalingGroupOpts)
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_, err := conn.CreateAutoScalingGroup(&autoScalingGroupOpts)
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if err != nil {
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return fmt.Errorf("Error creating Autoscaling Group: %s", err)
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}
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d.SetId(d.Get("name").(string))
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log.Printf("[INFO] AutoScaling Group ID: %s", d.Id())
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if err := waitForASGCapacity(d, meta); err != nil {
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return err
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}
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return resourceAwsAutoscalingGroupRead(d, meta)
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}
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func resourceAwsAutoscalingGroupRead(d *schema.ResourceData, meta interface{}) error {
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g, err := getAwsAutoscalingGroup(d, meta)
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if err != nil {
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return err
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}
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if g == nil {
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return nil
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}
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d.Set("availability_zones", g.AvailabilityZones)
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d.Set("default_cooldown", g.DefaultCooldown)
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d.Set("desired_capacity", g.DesiredCapacity)
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d.Set("health_check_grace_period", g.HealthCheckGracePeriod)
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d.Set("health_check_type", g.HealthCheckType)
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d.Set("launch_configuration", g.LaunchConfigurationName)
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d.Set("load_balancers", g.LoadBalancerNames)
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d.Set("min_size", g.MinSize)
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d.Set("max_size", g.MaxSize)
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d.Set("name", g.AutoScalingGroupName)
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d.Set("tag", g.Tags)
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d.Set("vpc_zone_identifier", strings.Split(*g.VPCZoneIdentifier, ","))
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d.Set("termination_policies", g.TerminationPolicies)
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return nil
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}
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func resourceAwsAutoscalingGroupUpdate(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).autoscalingconn
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opts := autoscaling.UpdateAutoScalingGroupInput{
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AutoScalingGroupName: aws.String(d.Id()),
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}
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if d.HasChange("default_cooldown") {
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opts.DefaultCooldown = aws.Int64(int64(d.Get("default_cooldown").(int)))
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}
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if d.HasChange("desired_capacity") {
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opts.DesiredCapacity = aws.Int64(int64(d.Get("desired_capacity").(int)))
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}
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if d.HasChange("launch_configuration") {
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opts.LaunchConfigurationName = aws.String(d.Get("launch_configuration").(string))
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}
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if d.HasChange("min_size") {
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opts.MinSize = aws.Int64(int64(d.Get("min_size").(int)))
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}
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if d.HasChange("max_size") {
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opts.MaxSize = aws.Int64(int64(d.Get("max_size").(int)))
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}
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if d.HasChange("health_check_grace_period") {
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opts.HealthCheckGracePeriod = aws.Int64(int64(d.Get("health_check_grace_period").(int)))
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}
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if d.HasChange("health_check_type") {
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opts.HealthCheckGracePeriod = aws.Int64(int64(d.Get("health_check_grace_period").(int)))
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opts.HealthCheckType = aws.String(d.Get("health_check_type").(string))
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}
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if d.HasChange("vpc_zone_identifier") {
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opts.VPCZoneIdentifier = expandVpcZoneIdentifiers(d.Get("vpc_zone_identifier").(*schema.Set).List())
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}
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if d.HasChange("availability_zones") {
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if v, ok := d.GetOk("availability_zones"); ok && v.(*schema.Set).Len() > 0 {
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opts.AvailabilityZones = expandStringList(d.Get("availability_zones").(*schema.Set).List())
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}
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}
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if d.HasChange("termination_policies") {
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// If the termination policy is set to null, we need to explicitly set
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// it back to "Default", or the API won't reset it for us.
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// This means GetOk() will fail us on the zero check.
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v := d.Get("termination_policies")
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if len(v.([]interface{})) > 0 {
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opts.TerminationPolicies = expandStringList(v.([]interface{}))
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} else {
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// Policies is a slice of string pointers, so build one.
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// Maybe there's a better idiom for this?
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log.Printf("[DEBUG] Explictly setting null termination policy to 'Default'")
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pol := "Default"
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s := make([]*string, 1, 1)
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s[0] = &pol
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opts.TerminationPolicies = s
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}
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}
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if err := setAutoscalingTags(conn, d); err != nil {
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return err
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} else {
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d.SetPartial("tag")
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}
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log.Printf("[DEBUG] AutoScaling Group update configuration: %#v", opts)
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_, err := conn.UpdateAutoScalingGroup(&opts)
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if err != nil {
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d.Partial(true)
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return fmt.Errorf("Error updating Autoscaling group: %s", err)
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}
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if d.HasChange("load_balancers") {
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o, n := d.GetChange("load_balancers")
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if o == nil {
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o = new(schema.Set)
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}
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if n == nil {
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n = new(schema.Set)
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}
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os := o.(*schema.Set)
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ns := n.(*schema.Set)
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remove := expandStringList(os.Difference(ns).List())
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add := expandStringList(ns.Difference(os).List())
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if len(remove) > 0 {
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_, err := conn.DetachLoadBalancers(&autoscaling.DetachLoadBalancersInput{
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AutoScalingGroupName: aws.String(d.Id()),
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LoadBalancerNames: remove,
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})
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if err != nil {
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return fmt.Errorf("[WARN] Error updating Load Balancers for AutoScaling Group (%s), error: %s", d.Id(), err)
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}
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}
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if len(add) > 0 {
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_, err := conn.AttachLoadBalancers(&autoscaling.AttachLoadBalancersInput{
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AutoScalingGroupName: aws.String(d.Id()),
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LoadBalancerNames: add,
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})
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if err != nil {
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return fmt.Errorf("[WARN] Error updating Load Balancers for AutoScaling Group (%s), error: %s", d.Id(), err)
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}
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}
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}
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return resourceAwsAutoscalingGroupRead(d, meta)
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}
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func resourceAwsAutoscalingGroupDelete(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).autoscalingconn
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// Read the autoscaling group first. If it doesn't exist, we're done.
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// We need the group in order to check if there are instances attached.
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// If so, we need to remove those first.
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g, err := getAwsAutoscalingGroup(d, meta)
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if err != nil {
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return err
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}
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if g == nil {
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return nil
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}
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if len(g.Instances) > 0 || *g.DesiredCapacity > 0 {
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if err := resourceAwsAutoscalingGroupDrain(d, meta); err != nil {
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return err
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}
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}
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log.Printf("[DEBUG] AutoScaling Group destroy: %v", d.Id())
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deleteopts := autoscaling.DeleteAutoScalingGroupInput{
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AutoScalingGroupName: aws.String(d.Id()),
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ForceDelete: aws.Bool(d.Get("force_delete").(bool)),
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}
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// We retry the delete operation to handle InUse/InProgress errors coming
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// from scaling operations. We should be able to sneak in a delete in between
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// scaling operations within 5m.
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err = resource.Retry(5*time.Minute, func() error {
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if _, err := conn.DeleteAutoScalingGroup(&deleteopts); err != nil {
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if awserr, ok := err.(awserr.Error); ok {
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switch awserr.Code() {
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case "InvalidGroup.NotFound":
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// Already gone? Sure!
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return nil
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case "ResourceInUse", "ScalingActivityInProgress":
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// These are retryable
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return awserr
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}
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}
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// Didn't recognize the error, so shouldn't retry.
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return resource.RetryError{Err: err}
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}
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// Successful delete
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return nil
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})
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if err != nil {
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return err
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}
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return resource.Retry(5*time.Minute, func() error {
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if g, _ = getAwsAutoscalingGroup(d, meta); g != nil {
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return fmt.Errorf("Auto Scaling Group still exists")
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}
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return nil
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})
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}
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func getAwsAutoscalingGroup(
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d *schema.ResourceData,
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meta interface{}) (*autoscaling.Group, error) {
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conn := meta.(*AWSClient).autoscalingconn
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describeOpts := autoscaling.DescribeAutoScalingGroupsInput{
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AutoScalingGroupNames: []*string{aws.String(d.Id())},
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}
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log.Printf("[DEBUG] AutoScaling Group describe configuration: %#v", describeOpts)
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describeGroups, err := conn.DescribeAutoScalingGroups(&describeOpts)
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if err != nil {
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autoscalingerr, ok := err.(awserr.Error)
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if ok && autoscalingerr.Code() == "InvalidGroup.NotFound" {
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d.SetId("")
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return nil, nil
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}
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return nil, fmt.Errorf("Error retrieving AutoScaling groups: %s", err)
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}
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// Search for the autoscaling group
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for idx, asc := range describeGroups.AutoScalingGroups {
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if *asc.AutoScalingGroupName == d.Id() {
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return describeGroups.AutoScalingGroups[idx], nil
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}
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}
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// ASG not found
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d.SetId("")
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return nil, nil
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}
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func resourceAwsAutoscalingGroupDrain(d *schema.ResourceData, meta interface{}) error {
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conn := meta.(*AWSClient).autoscalingconn
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if d.Get("force_delete").(bool) {
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log.Printf("[DEBUG] Skipping ASG drain, force_delete was set.")
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return nil
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}
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// First, set the capacity to zero so the group will drain
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log.Printf("[DEBUG] Reducing autoscaling group capacity to zero")
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opts := autoscaling.UpdateAutoScalingGroupInput{
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AutoScalingGroupName: aws.String(d.Id()),
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DesiredCapacity: aws.Int64(0),
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MinSize: aws.Int64(0),
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MaxSize: aws.Int64(0),
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}
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if _, err := conn.UpdateAutoScalingGroup(&opts); err != nil {
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return fmt.Errorf("Error setting capacity to zero to drain: %s", err)
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}
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// Next, wait for the autoscale group to drain
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log.Printf("[DEBUG] Waiting for group to have zero instances")
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return resource.Retry(10*time.Minute, func() error {
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g, err := getAwsAutoscalingGroup(d, meta)
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if err != nil {
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return resource.RetryError{Err: err}
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}
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if g == nil {
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return nil
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}
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if len(g.Instances) == 0 {
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return nil
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}
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return fmt.Errorf("group still has %d instances", len(g.Instances))
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})
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}
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// Waits for a minimum number of healthy instances to show up as healthy in the
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// ASG before continuing. Waits up to `waitForASGCapacityTimeout` for
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// "desired_capacity", or "min_size" if desired capacity is not specified.
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//
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// If "min_elb_capacity" is specified, will also wait for that number of
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// instances to show up InService in all attached ELBs. See "Waiting for
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// Capacity" in docs for more discussion of the feature.
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func waitForASGCapacity(d *schema.ResourceData, meta interface{}) error {
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wantASG := d.Get("min_size").(int)
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if v := d.Get("desired_capacity").(int); v > 0 {
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wantASG = v
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}
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wantELB := d.Get("min_elb_capacity").(int)
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wait, err := time.ParseDuration(d.Get("wait_for_capacity_timeout").(string))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if wait == 0 {
|
|
log.Printf("[DEBUG] Capacity timeout set to 0, skipping capacity waiting.")
|
|
return nil
|
|
}
|
|
|
|
log.Printf("[DEBUG] Waiting %s for capacity: %d ASG, %d ELB",
|
|
wait, wantASG, wantELB)
|
|
|
|
return resource.Retry(wait, 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
|
|
}
|
|
|
|
func expandVpcZoneIdentifiers(list []interface{}) *string {
|
|
strs := make([]string, len(list))
|
|
for _, s := range list {
|
|
strs = append(strs, s.(string))
|
|
}
|
|
return aws.String(strings.Join(strs, ","))
|
|
}
|