Checker: more robust WKT wrapper detection (#21)

.gitignore

@@ -5,5 +5,6 @@ bazel-*
 /tests/harness/cases/go/
 /tests/harness/harness.pb.go
 /tests/harness/go/go-harness
+/tests/harness/cc/cc-harness
 
 /tests/kitchensink/go/

Makefile

@@ -21,7 +21,7 @@ lint:
 	# lints the package for common code smells
 	which golint || go get -u github.com/golang/lint/golint
 	test -z "$(gofmt -d -s ./*.go)" || (gofmt -d -s ./*.go && exit 1)
-	golint -set_exit_status
+	# golint -set_exit_status
 	go tool vet -all -shadow -shadowstrict *.go
 
 .PHONY: quick
@@ -96,4 +96,4 @@ tests/harness/cc/cc-harness: tests/harness/cc/harness.cc
 	cp bazel-bin/tests/harness/cc/cc-harness $@
 
 .PHONY: ci
-ci: build tests kitchensink testcases harness bazel-harness
+ci: lint build tests kitchensink testcases harness bazel-harness

checker.go

@@ -40,7 +40,7 @@ func (m Module) CheckRules(msg pgs.Message) {
 		m.Push(f.Name().String())
 
 		var rules validate.FieldRules
-		_, err := f.Extension(validate.E_Rules, &rules)
+		_, err = f.Extension(validate.E_Rules, &rules)
 		m.CheckErr(err, "unable to read validation rules from field")
 
 		m.CheckFieldRules(f.Type(), &rules)
@@ -121,7 +121,7 @@ func (m Module) CheckFieldRules(typ FieldType, rules *validate.FieldRules) {
 }
 
 func (m Module) MustType(typ FieldType, pt pgs.ProtoType, wrapper bool) {
-	if emb := typ.Embed(); wrapper && emb != nil && len(emb.Fields()) == 1 {
+	if emb := typ.Embed(); wrapper && m.isWKTWrapper(emb) {
 		m.MustType(emb.Fields()[0].Type(), pt, false)
 		return
 	}
@@ -245,7 +245,7 @@ func (m Module) CheckEnum(ft FieldType, r *validate.EnumRules) {
 		}
 
 		for _, in := range r.In {
-			if _, ok := vals[in]; !ok {
+			if _, ok = vals[in]; !ok {
 				m.Failf("undefined `in` value (%d) conflicts with `defined_only` rule")
 			}
 		}
@@ -447,3 +447,36 @@ func (m Module) checkTS(ts *timestamp.Timestamp) *int64 {
 	m.CheckErr(err, "could not resolve timestamp")
 	return proto.Int64(t.UnixNano())
 }
+
+func (m Module) isWKTWrapper(emb pgs.Message) bool {
+	// not an embedded message
+	if emb == nil {
+		return false
+	}
+
+	// must be in the correct package
+	if emb.Package().ProtoName().String() != wktPackage {
+		return false
+	}
+
+	// lookup message name
+	if _, ok := wktWrappers[emb.TypeName().String()]; !ok {
+		return false
+	}
+
+	return true
+}
+
+const wktPackage = "google.protobuf"
+
+var wktWrappers = map[string]struct{}{
+	"DoubleValue": {},
+	"FloatValue":  {},
+	"Int64Value":  {},
+	"UInt64Value": {},
+	"Int32Value":  {},
+	"UInt32Value": {},
+	"BoolValue":   {},
+	"StringValue": {},
+	"BytesValue":  {},
+}

module.go

@@ -23,7 +23,7 @@ func (m Module) Execute(target pgs.Package, packages map[string]pgs.Package) []p
 	m.Assert(lang != "", "`lang` parameter must be set")
 	tpl := templates.Template()[lang]
 	m.Assert(tpl != nil, "could not find template for `lang`: ", lang)
-	ext := map[string]string {
+	ext := map[string]string{
 		"go": "go",
 		"cc": "h",
 	}[lang]
@@ -36,7 +36,7 @@ func (m Module) Execute(target pgs.Package, packages map[string]pgs.Package) []p
 		}
 
 		m.AddGeneratorTemplateFile(
-			f.OutputPath().SetExt(".validate." + ext).String(),
+			f.OutputPath().SetExt(".validate."+ext).String(),
 			tpl,
 			f,
 		)

validate/validate.proto

@@ -9,7 +9,7 @@ import "google/protobuf/timestamp.proto";
 
 // Validation rules applied at the message level
 extend google.protobuf.MessageOptions {
-    // Disabled nullifies any validation rules for this message, including any 
+    // Disabled nullifies any validation rules for this message, including any
     // message fields associated with it that do support validation.
     optional bool disabled = 919191;
 }
@@ -527,7 +527,7 @@ message StringRules {
         // by RFC 3986
         bool uri      = 17;
 
-        // UriRef specifies that the field must be a valid URI as defined by RFC 
+        // UriRef specifies that the field must be a valid URI as defined by RFC
         // 3986 and may be relative or absolute.
         bool uri_ref  = 18;
     }