90 lines
2.0 KiB
Go
90 lines
2.0 KiB
Go
package aws
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import (
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"log"
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"github.com/hashicorp/terraform/helper/schema"
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"github.com/mitchellh/goamz/ec2"
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)
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// tagsSchema returns the schema to use for tags.
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func tagsSchema() *schema.Schema {
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return &schema.Schema{
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Type: schema.TypeMap,
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Optional: true,
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}
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}
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// setTags is a helper to set the tags for a resource. It expects the
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// tags field to be named "tags"
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func setTags(conn *ec2.EC2, d *schema.ResourceData) error {
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if d.HasChange("tags") {
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oraw, nraw := d.GetChange("tags")
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o := oraw.(map[string]interface{})
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n := nraw.(map[string]interface{})
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create, remove := diffTags(tagsFromMap(o), tagsFromMap(n))
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// Set tags
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if len(remove) > 0 {
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log.Printf("[DEBUG] Removing tags: %#v", remove)
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if _, err := conn.DeleteTags([]string{d.Id()}, remove); err != nil {
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return err
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}
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}
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if len(create) > 0 {
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log.Printf("[DEBUG] Creating tags: %#v", create)
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if _, err := conn.CreateTags([]string{d.Id()}, create); err != nil {
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return err
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}
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}
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}
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return nil
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}
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// diffTags takes our tags locally and the ones remotely and returns
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// the set of tags that must be created, and the set of tags that must
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// be destroyed.
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func diffTags(oldTags, newTags []ec2.Tag) ([]ec2.Tag, []ec2.Tag) {
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// First, we're creating everything we have
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create := make(map[string]interface{})
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for _, t := range newTags {
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create[t.Key] = t.Value
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}
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// Build the list of what to remove
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var remove []ec2.Tag
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for _, t := range oldTags {
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old, ok := create[t.Key]
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if !ok || old != t.Value {
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// Delete it!
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remove = append(remove, t)
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}
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}
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return tagsFromMap(create), remove
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}
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// tagsFromMap returns the tags for the given map of data.
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func tagsFromMap(m map[string]interface{}) []ec2.Tag {
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result := make([]ec2.Tag, 0, len(m))
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for k, v := range m {
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result = append(result, ec2.Tag{
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Key: k,
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Value: v.(string),
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})
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}
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return result
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}
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// tagsToMap turns the list of tags into a map.
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func tagsToMap(ts []ec2.Tag) map[string]string {
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result := make(map[string]string)
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for _, t := range ts {
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result[t.Key] = t.Value
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}
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return result
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}
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