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autoscaling_tags.go
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autoscaling_tags.go
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package aws
import (
"bytes"
"fmt"
"log"
"regexp"
"strconv"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/autoscaling"
"github.com/hashicorp/terraform/helper/hashcode"
"github.com/hashicorp/terraform/helper/schema"
)
// autoscalingTagSchema returns the schema to use for the tag element.
func autoscalingTagSchema() *schema.Schema {
return &schema.Schema{
Type: schema.TypeSet,
Optional: true,
Elem: &schema.Resource{
Schema: map[string]*schema.Schema{
"key": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"value": &schema.Schema{
Type: schema.TypeString,
Required: true,
},
"propagate_at_launch": &schema.Schema{
Type: schema.TypeBool,
Required: true,
},
},
},
Set: autoscalingTagToHash,
}
}
func autoscalingTagToHash(v interface{}) int {
var buf bytes.Buffer
m := v.(map[string]interface{})
buf.WriteString(fmt.Sprintf("%s-", m["key"].(string)))
buf.WriteString(fmt.Sprintf("%s-", m["value"].(string)))
buf.WriteString(fmt.Sprintf("%t-", m["propagate_at_launch"].(bool)))
return hashcode.String(buf.String())
}
// setTags is a helper to set the tags for a resource. It expects the
// tags field to be named "tag"
func setAutoscalingTags(conn *autoscaling.AutoScaling, d *schema.ResourceData) error {
resourceID := d.Get("name").(string)
var createTags, removeTags []*autoscaling.Tag
if d.HasChange("tag") || d.HasChange("tags") {
oraw, nraw := d.GetChange("tag")
o := setToMapByKey(oraw.(*schema.Set), "key")
n := setToMapByKey(nraw.(*schema.Set), "key")
old, err := autoscalingTagsFromMap(o, resourceID)
if err != nil {
return err
}
new, err := autoscalingTagsFromMap(n, resourceID)
if err != nil {
return err
}
c, r, err := diffAutoscalingTags(old, new, resourceID)
if err != nil {
return err
}
createTags = append(createTags, c...)
removeTags = append(removeTags, r...)
oraw, nraw = d.GetChange("tags")
old, err = autoscalingTagsFromList(oraw.([]interface{}), resourceID)
if err != nil {
return err
}
new, err = autoscalingTagsFromList(nraw.([]interface{}), resourceID)
if err != nil {
return err
}
c, r, err = diffAutoscalingTags(old, new, resourceID)
if err != nil {
return err
}
createTags = append(createTags, c...)
removeTags = append(removeTags, r...)
}
// Set tags
if len(removeTags) > 0 {
log.Printf("[DEBUG] Removing autoscaling tags: %#v", removeTags)
remove := autoscaling.DeleteTagsInput{
Tags: removeTags,
}
if _, err := conn.DeleteTags(&remove); err != nil {
return err
}
}
if len(createTags) > 0 {
log.Printf("[DEBUG] Creating autoscaling tags: %#v", createTags)
create := autoscaling.CreateOrUpdateTagsInput{
Tags: createTags,
}
if _, err := conn.CreateOrUpdateTags(&create); err != nil {
return err
}
}
return nil
}
// diffTags takes our tags locally and the ones remotely and returns
// the set of tags that must be created, and the set of tags that must
// be destroyed.
func diffAutoscalingTags(oldTags, newTags []*autoscaling.Tag, resourceID string) ([]*autoscaling.Tag, []*autoscaling.Tag, error) {
// First, we're creating everything we have
create := make(map[string]interface{})
for _, t := range newTags {
tag := map[string]interface{}{
"key": *t.Key,
"value": *t.Value,
"propagate_at_launch": *t.PropagateAtLaunch,
}
create[*t.Key] = tag
}
// Build the list of what to remove
var remove []*autoscaling.Tag
for _, t := range oldTags {
old, ok := create[*t.Key].(map[string]interface{})
if !ok || old["value"] != *t.Value || old["propagate_at_launch"] != *t.PropagateAtLaunch {
// Delete it!
remove = append(remove, t)
}
}
createTags, err := autoscalingTagsFromMap(create, resourceID)
if err != nil {
return nil, nil, err
}
return createTags, remove, nil
}
func autoscalingTagsFromList(vs []interface{}, resourceID string) ([]*autoscaling.Tag, error) {
result := make([]*autoscaling.Tag, 0, len(vs))
for _, tag := range vs {
attr, ok := tag.(map[string]interface{})
if !ok {
continue
}
t, err := autoscalingTagFromMap(attr, resourceID)
if err != nil {
return nil, err
}
if t != nil {
result = append(result, t)
}
}
return result, nil
}
// tagsFromMap returns the tags for the given map of data.
func autoscalingTagsFromMap(m map[string]interface{}, resourceID string) ([]*autoscaling.Tag, error) {
result := make([]*autoscaling.Tag, 0, len(m))
for _, v := range m {
attr, ok := v.(map[string]interface{})
if !ok {
continue
}
t, err := autoscalingTagFromMap(attr, resourceID)
if err != nil {
return nil, err
}
if t != nil {
result = append(result, t)
}
}
return result, nil
}
func autoscalingTagFromMap(attr map[string]interface{}, resourceID string) (*autoscaling.Tag, error) {
if _, ok := attr["key"]; !ok {
return nil, fmt.Errorf("%s: invalid tag attributes: key missing", resourceID)
}
if _, ok := attr["value"]; !ok {
return nil, fmt.Errorf("%s: invalid tag attributes: value missing", resourceID)
}
if _, ok := attr["propagate_at_launch"]; !ok {
return nil, fmt.Errorf("%s: invalid tag attributes: propagate_at_launch missing", resourceID)
}
var propagateAtLaunch bool
var err error
if v, ok := attr["propagate_at_launch"].(bool); ok {
propagateAtLaunch = v
}
if v, ok := attr["propagate_at_launch"].(string); ok {
if propagateAtLaunch, err = strconv.ParseBool(v); err != nil {
return nil, fmt.Errorf(
"%s: invalid tag attribute: invalid value for propagate_at_launch: %s",
resourceID,
v,
)
}
}
t := &autoscaling.Tag{
Key: aws.String(attr["key"].(string)),
Value: aws.String(attr["value"].(string)),
PropagateAtLaunch: aws.Bool(propagateAtLaunch),
ResourceId: aws.String(resourceID),
ResourceType: aws.String("auto-scaling-group"),
}
if tagIgnoredAutoscaling(t) {
return nil, nil
}
return t, nil
}
// autoscalingTagsToMap turns the list of tags into a map.
func autoscalingTagsToMap(ts []*autoscaling.Tag) map[string]interface{} {
tags := make(map[string]interface{})
for _, t := range ts {
tag := map[string]interface{}{
"key": *t.Key,
"value": *t.Value,
"propagate_at_launch": *t.PropagateAtLaunch,
}
tags[*t.Key] = tag
}
return tags
}
// autoscalingTagDescriptionsToMap turns the list of tags into a map.
func autoscalingTagDescriptionsToMap(ts *[]*autoscaling.TagDescription) map[string]map[string]interface{} {
tags := make(map[string]map[string]interface{})
for _, t := range *ts {
tag := map[string]interface{}{
"key": *t.Key,
"value": *t.Value,
"propagate_at_launch": *t.PropagateAtLaunch,
}
tags[*t.Key] = tag
}
return tags
}
// autoscalingTagDescriptionsToSlice turns the list of tags into a slice.
func autoscalingTagDescriptionsToSlice(ts []*autoscaling.TagDescription) []map[string]interface{} {
tags := make([]map[string]interface{}, 0, len(ts))
for _, t := range ts {
tags = append(tags, map[string]interface{}{
"key": *t.Key,
"value": *t.Value,
"propagate_at_launch": *t.PropagateAtLaunch,
})
}
return tags
}
func setToMapByKey(s *schema.Set, key string) map[string]interface{} {
result := make(map[string]interface{})
for _, rawData := range s.List() {
data := rawData.(map[string]interface{})
result[data[key].(string)] = data
}
return result
}
// compare a tag against a list of strings and checks if it should
// be ignored or not
func tagIgnoredAutoscaling(t *autoscaling.Tag) bool {
filter := []string{"^aws:"}
for _, v := range filter {
log.Printf("[DEBUG] Matching %v with %v\n", v, *t.Key)
if r, _ := regexp.MatchString(v, *t.Key); r == true {
log.Printf("[DEBUG] Found AWS specific tag %s (val: %s), ignoring.\n", *t.Key, *t.Value)
return true
}
}
return false
}