custom_flatten changes

mmv1/products/compute/Router.yaml

@@ -159,6 +159,7 @@ properties:
           ranges will be advertised in addition to any specified groups.
           Leave this field blank to advertise no custom IP ranges.
         send_empty_value: true
+        custom_flatten: 'templates/terraform/custom_flatten/reorder_ip_ranges.go.erb'
         item_type: !ruby/object:Api::Type::NestedObject
           properties:
             - !ruby/object:Api::Type::String

mmv1/templates/terraform/custom_flatten/reorder_ip_ranges.go.erb

@@ -0,0 +1,65 @@
+<%# The license inside this block applies to this file.
+	# Copyright 2017 Google Inc.
+	# Licensed under the Apache License, Version 2.0 (the "License");
+	# you may not use this file except in compliance with the License.
+	# You may obtain a copy of the License at
+	#
+	#     http://www.apache.org/licenses/LICENSE-2.0
+	#
+	# Unless required by applicable law or agreed to in writing, software
+	# distributed under the License is distributed on an "AS IS" BASIS,
+	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+	# See the License for the specific language governing permissions and
+	# limitations under the License.
+-%>
+func flatten<%= prefix -%><%= titlelize_property(property) -%>(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
+    if v == nil {
+        return nil
+    }
+    original := v.([]interface{})
+    if len(original) == 0 {
+        return nil
+    }
+    transformed := make([]interface{})
+    source := d.Get("bgp.0.advertised_ip_ranges").([]interface{})
+    new_entries = make([]interface{})
+
+    for _, val1 := range original {
+        found := false
+        for _, val2 := range source {
+            if val1 == val2 {
+                found = true
+                break
+            }
+        }
+        if !found {
+            new_entries = append(new_entries, val1)
+        }
+    }
+
+    i := 0
+    for _, val1 := range source {
+        found := false
+        for _, val2 := range original {
+            if val1 == val2 {
+                found = true
+                break
+            }
+        }
+        if found {
+            transformed = append(transformed, val1)
+        } else  {
+            if len(new_entries) > i {
+                transformed = append(transformed, new_entries[i])
+                i++
+            }
+        }
+    }
+
+    for i <= len(new_entries) {
+        transformed = append(transformed, new_entries[i])
+        i++
+    }
+
+    return transformed
+}