bare minimum tag implementation for Elastic Beanstalk

builtin/providers/aws/tagsBeanstalk.go

@@ -0,0 +1,52 @@
+package aws
+
+import (
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/elasticbeanstalk"
+)
+
+// 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 diffTagsBeanstalk(oldTags, newTags []*elasticbeanstalk.Tag) ([]*elasticbeanstalk.Tag, []*elasticbeanstalk.Tag) {
+	// First, we're creating everything we have
+	create := make(map[string]interface{})
+	for _, t := range newTags {
+		create[*t.Key] = *t.Value
+	}
+
+	// Build the list of what to remove
+	var remove []*elasticbeanstalk.Tag
+	for _, t := range oldTags {
+		old, ok := create[*t.Key]
+		if !ok || old != *t.Value {
+			// Delete it!
+			remove = append(remove, t)
+		}
+	}
+
+	return tagsFromMapBeanstalk(create), remove
+}
+
+// tagsFromMap returns the tags for the given map of data.
+func tagsFromMapBeanstalk(m map[string]interface{}) []*elasticbeanstalk.Tag {
+	var result []*elasticbeanstalk.Tag
+	for k, v := range m {
+		result = append(result, &elasticbeanstalk.Tag{
+			Key:   aws.String(k),
+			Value: aws.String(v.(string)),
+		})
+	}
+
+	return result
+}
+
+// tagsToMap turns the list of tags into a map.
+func tagsToMapBeanstalk(ts []*elasticbeanstalk.Tag) map[string]string {
+	result := make(map[string]string)
+	for _, t := range ts {
+		result[*t.Key] = *t.Value
+	}
+
+	return result
+}

builtin/providers/aws/tagsBeanstalk_test.go

@@ -0,0 +1,85 @@
+package aws
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+
+	"github.com/aws/aws-sdk-go/service/elasticbeanstalk"
+	"github.com/hashicorp/terraform/helper/resource"
+	"github.com/hashicorp/terraform/terraform"
+)
+
+func TestDiffBeanstalkTags(t *testing.T) {
+	cases := []struct {
+		Old, New       map[string]interface{}
+		Create, Remove map[string]string
+	}{
+		// Basic add/remove
+		{
+			Old: map[string]interface{}{
+				"foo": "bar",
+			},
+			New: map[string]interface{}{
+				"bar": "baz",
+			},
+			Create: map[string]string{
+				"bar": "baz",
+			},
+			Remove: map[string]string{
+				"foo": "bar",
+			},
+		},
+
+		// Modify
+		{
+			Old: map[string]interface{}{
+				"foo": "bar",
+			},
+			New: map[string]interface{}{
+				"foo": "baz",
+			},
+			Create: map[string]string{
+				"foo": "baz",
+			},
+			Remove: map[string]string{
+				"foo": "bar",
+			},
+		},
+	}
+
+	for i, tc := range cases {
+		c, r := diffTagsBeanstalk(tagsFromMapBeanstalk(tc.Old), tagsFromMapBeanstalk(tc.New))
+		cm := tagsToMapBeanstalk(c)
+		rm := tagsToMapBeanstalk(r)
+		if !reflect.DeepEqual(cm, tc.Create) {
+			t.Fatalf("%d: bad create: %#v", i, cm)
+		}
+		if !reflect.DeepEqual(rm, tc.Remove) {
+			t.Fatalf("%d: bad remove: %#v", i, rm)
+		}
+	}
+}
+
+// testAccCheckTags can be used to check the tags on a resource.
+func testAccCheckBeanstalkTags(
+	ts *[]*elasticbeanstalk.Tag, key string, value string) resource.TestCheckFunc {
+	return func(s *terraform.State) error {
+		m := tagsToMapBeanstalk(*ts)
+		v, ok := m[key]
+		if value != "" && !ok {
+			return fmt.Errorf("Missing tag: %s", key)
+		} else if value == "" && ok {
+			return fmt.Errorf("Extra tag: %s", key)
+		}
+		if value == "" {
+			return nil
+		}
+
+		if v != value {
+			return fmt.Errorf("%s: bad value: %s", key, v)
+		}
+
+		return nil
+	}
+}