1 files changed, 107 insertions, 0 deletions
diff --git a/config.go b/config.go
new file mode 100644
index 0000000..afbb159
--- /dev/null
+++ b/config.go
@@ -0,0 +1,107 @@
+package main
+
+// functions to import and export the protobuf
+// data to and from config files
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"go.wit.com/log"
+	"google.golang.org/protobuf/proto"
+)
+
+func (m *Portmaps) ConfigSave() error {
+	if m == nil {
+		return fmt.Errorf("ConfigSave() nil")
+	}
+	s := m.FormatTEXT()
+	log.Info("proto.Marshal() worked len", len(s))
+	configWrite([]byte(s))
+	return nil
+}
+
+func (m *Portmaps) ConfigLoad() error {
+	if m == nil {
+		return errors.New("It's not safe to run ConfigLoad() on a nil ?")
+	}
+	if os.Getenv("CLOUD_HOME") == "" {
+		homeDir, _ := os.UserHomeDir()
+		fullpath := filepath.Join(homeDir, ".config/cloud")
+		os.Setenv("CLOUD_HOME", fullpath)
+	}
+
+	var data []byte
+	var err error
+	if data, err = loadFile("gus.text"); err != nil {
+		// something went wrong loading the file
+		return err
+	}
+
+	if data != nil {
+		if err = proto.Unmarshal(data, m); err != nil {
+			log.Warn("broken gus.text config file", "gus.text")
+			return err
+		}
+		return nil
+	}
+
+	log.Log(INFO, "gus.ConfigLoad() has", m.Len(), "port mappings")
+	return nil
+}
+
+func loadFile(filename string) ([]byte, error) {
+	homeDir, err := os.UserHomeDir()
+	p := filepath.Join(homeDir, ".config/cloud")
+	fullname := filepath.Join(p, filename)
+	data, err := os.ReadFile(fullname)
+	if errors.Is(err, os.ErrNotExist) {
+		// if file does not exist, just return nil. this
+		return nil, nil
+	}
+	if err != nil {
+		// log.Info("open config file :", err)
+		return nil, err
+	}
+	return data, nil
+}
+
+func (m *Portmaps) loadFile(fname string) ([]byte, error) {
+	fullname := filepath.Join(os.Getenv("CLOUD_HOME"), fname)
+
+	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/cloud")
+	fname := filepath.Join(p, "gus.text")
+	cfgfile, err := os.OpenFile(fname, 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(fname string, data []byte) error {
+	fullname := filepath.Join(os.Getenv("CLOUD_HOME"), fname)
+
+	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
+}