Serve event contraints via API

pkg/codegen/assets/events_rest_def.gen.go.tpl

@@ -4,14 +4,10 @@ package rest
 //
 // Changes to this file may cause incorrect behavior and will be lost if
 // the code is regenerated.
-//
-// Definitions file that controls how this file is generated:
-// {{ .Source }}
 
 func getEventTypeDefinitions() []eventTypeDef {
 	return []eventTypeDef{
 	{{ range .Definitions }}
-		// {{ printf "%#v" .Imports }}
 		{{ range $r := .Resources }}
 		{{ template "eventTypeDefinitions" dict "res" $r "type" "on"     "types" .On          }}
 		{{ template "eventTypeDefinitions" dict "res" $r "type" "before" "types" .BeforeAfter }}
@@ -37,6 +33,13 @@ func getEventTypeDefinitions() []eventTypeDef {
 		{{ end }}
 		{{ end }}
 		},
+		Constraints: []eventTypeConstraintDef{
+		{{ range $.res.Constraints }}
+			{
+				Name: {{ printf "%q" .Name }},
+			},
+		{{ end }}
+		},
 	},
 	{{ end }}
 {{ end }}

pkg/codegen/events.go

@@ -38,10 +38,11 @@ type (
 		// used for filename
 		ResourceFile string
 
-		On          []string      `yaml:"on"`
-		BeforeAfter []string      `yaml:"ba"`
-		Properties  []*eventProps `yaml:"props"`
-		Result      string        `yaml:"result"`
+		On          []string           `yaml:"on"`
+		BeforeAfter []string           `yaml:"ba"`
+		Properties  []*eventProps      `yaml:"props"`
+		Constraints []*eventConstraint `yaml:"constraints"`
+		Result      string             `yaml:"result"`
 	}
 
 	eventProps struct {
@@ -58,6 +59,10 @@ type (
 		// Do not allow change of the variable through
 		Immutable bool
 	}
+
+	eventConstraint struct {
+		Name string
+	}
 )
 
 func procEvents(mm ...string) (dd []*eventsDef, err error) {