add Save()

save.go

@@ -1,7 +1,47 @@
 package config
 
-// functions to import and export the protobuf
-// data to and from config files
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"go.wit.com/log"
+	"google.golang.org/protobuf/encoding/prototext"
+	"google.golang.org/protobuf/proto"
+)
+
+var ErrProtoFilename error = log.Errorf("proto does not have Filename")
+
+func ConfigSave(pb proto.Message) error {
+	// get pb.Filename if it is there in the .proto file
+	fullname, ok := GetFilename(pb)
+	if !ok {
+		return ErrProtoFilename
+	}
+
+	// Unmarshal()
+	data, err := prototext.Marshal(pb)
+	if err != nil {
+		return err
+	}
+
+	log.Infof("ConfigSave() filename=%s %d\n", fullname, len(data))
+	return configWrite(fullname, data)
+}
+
+func configWrite(fullname string, data []byte) error {
+	if _, base := filepath.Split(fullname); base == "" {
+		return fmt.Errorf("--config option not set")
+	}
+	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
+	defer cfgfile.Close()
+	if err != nil {
+		log.Warn("open config file :", err)
+		return err
+	}
+	_, err = cfgfile.Write(data)
+	return err
+}
 
 /*
 
@@ -20,19 +60,6 @@ func (e *Events) Save() {
 }
 
 
-func configWrite(fullname string, data []byte) error {
-	if _, base := filepath.Split(fullname); base == "" {
-		return fmt.Errorf("--config option not set")
-	}
-	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
-	defer cfgfile.Close()
-	if err != nil {
-		log.Warn("open config file :", err)
-		return err
-	}
-	cfgfile.Write(data)
-	return nil
-}
 
 func (m *Portmaps) configWrite(fullname string, data []byte) error {
 	if _, base := filepath.Split(fullname); base == "" {