save config file works

Signed-off-by: Jeff Carr <jcarr@wit.com>

config.go

@@ -0,0 +1,72 @@
+package zoopb
+
+// functions to import and export the protobuf
+// data to and from config files
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+
+	"go.wit.com/log"
+	"google.golang.org/protobuf/proto"
+)
+
+// writes out the cluster information it seperate files
+// to make it humanly possible to hand edit things as needed
+func (m *Machines) ConfigSave() error {
+	data, err := m.Marshal()
+	if err != nil {
+		log.Info("proto.Marshal() failed len", len(data), err)
+		return err
+	}
+	log.Info("proto.Marshal() worked len", len(data))
+	configWrite(data)
+	return nil
+}
+func ConfigSaveRaw(data []byte) error {
+	configWrite(data)
+	return nil
+}
+
+func (m *Machines) ConfigLoad() error {
+	if m == nil {
+		return errors.New("It's not safe to run ConfigLoad() on a nil ?")
+	}
+
+	if data, err := loadFile("zookeeper.pb"); err == nil {
+		if err = proto.Unmarshal(data, m); err != nil {
+			log.Warn("broken zookeeper.pb config file")
+			return err
+		}
+	} else {
+		return err
+	}
+	return nil
+}
+
+func loadFile(filename string) ([]byte, error) {
+	homeDir, err := os.UserHomeDir()
+	p := filepath.Join(homeDir, ".config/zookeeper")
+	fullname := filepath.Join(p, filename)
+	data, err := os.ReadFile(fullname)
+	if err != nil {
+		// log.Info("open config file :", err)
+		return nil, err
+	}
+	return data, nil
+}
+
+func configWrite(data []byte) error {
+	homeDir, err := os.UserHomeDir()
+	p := filepath.Join(homeDir, ".config/zookeeper")
+	fname := filepath.Join(p, "zookeeper.pb")
+	cfgfile, err := os.OpenFile(fname, os.O_RDWR|os.O_CREATE, 0666)
+	defer cfgfile.Close()
+	if err != nil {
+		log.Warn("open config file :", err)
+		return err
+	}
+	cfgfile.Write(data)
+	return nil
+}

helpers.go

@@ -51,3 +51,13 @@ func (m *Machine) Marshal() ([]byte, error) {
 func (m *Machine) Unmarshal(data []byte) error {
 	return proto.Unmarshal(data, m)
 }
+
+// marshal to wire
+func (m *Machines) Marshal() ([]byte, error) {
+	return proto.Marshal(m)
+}
+
+// unmarshal from wire
+func (m *Machines) Unmarshal(data []byte) error {
+	return proto.Unmarshal(data, m)
+}