make a portmap protobuf & ConfigSave()

Makefile

@@ -30,7 +30,7 @@ vet:
 	@echo this go binary package builds okay
 
 clean:
-	rm -f go.*
+	rm -f go.* *.pb.go
 	rm -f gus
 
 portmap.pb.go: portmap.proto

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
+}

main.go

@@ -4,6 +4,8 @@
 package main
 
 import (
+	"io"
+	"net"
 	"os"
 	"time"
 
@@ -35,5 +37,47 @@ func main() {
 
 	// go NewWatchdog()
 
+	go listen3000()
+
 	startHTTP()
 }
+
+func listen3000() {
+	// Listen on local port 3000
+	listener, err := net.Listen("tcp", "0.0.0.0:3000")
+	if err != nil {
+		log.Fatalf("Failed to listen on port 3000: %v", err)
+	}
+	defer listener.Close()
+	log.Println("Listening on port 3000...")
+
+	for {
+		// Accept incoming connection
+		clientConn, err := listener.Accept()
+		if err != nil {
+			log.Printf("Failed to accept client connection: %v", err)
+			continue
+		}
+		log.Printf("Client connected: %s", clientConn.RemoteAddr())
+
+		// Handle the connection in a separate goroutine
+		go handleConnection(clientConn)
+	}
+}
+
+func handleConnection(clientConn net.Conn) {
+	defer clientConn.Close()
+
+	// Connect to the target server
+	targetConn, err := net.Dial("tcp", "go.wit.com:44355")
+	if err != nil {
+		log.Printf("Failed to connect to go.wit.com %v", err)
+		return
+	}
+	defer targetConn.Close()
+	log.Printf("Connected to target server: %s", targetConn.RemoteAddr())
+
+	// Bidirectional copy of data
+	go io.Copy(targetConn, clientConn) // Client -> Target
+	io.Copy(clientConn, targetConn)    // Target -> Client
+}

portmap.proto

@@ -2,6 +2,17 @@ syntax = "proto3";
 
 package gus;
 
+message Event {
+        string             hostname     = 1;
+        string             version      = 2;
+}
+
+message Events {
+        string             uuid         = 1;
+        string             version      = 2;
+        repeated Event     events       = 3;
+}
+
 message Portmap {
         int64              listen       = 1;
         string             connect      = 2;