recv & send

main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+)
+
+type loggerLevels struct {
+	Debug *log.Logger
+	Error *log.Logger
+}
+
+type mailRelayConfig struct {
+	Server   string `json:"server"`
+	Port     int    `json:"port"`
+	Username string `json:"username"`
+	Password string `json:"password"`
+}
+
+// Logger provides application logging.
+var Logger loggerLevels
+
+func main() {
+
+	Logger.Debug = log.New(os.Stdout, "debug: ", log.Ldate|log.Ltime|log.Lshortfile)
+	Logger.Error = log.New(os.Stderr, "error: ", log.Ldate|log.Ltime|log.Lshortfile)
+
+	var configFile string
+	flag.StringVar(&configFile, "config", "/etc/mailrelay.json", "specifies JSON config file")
+	flag.Parse()
+
+	appConfig, err := loadConfig(configFile)
+	if err != nil {
+		Logger.Error.Fatalf("loading config: %v", err)
+	}
+
+	err = Start(appConfig)
+	if err != nil {
+		Logger.Error.Fatalf("starting server: %v", err)
+	}
+
+	// Wait for SIGINT
+	c := make(chan os.Signal, 1)
+	signal.Notify(c, os.Interrupt)
+	signal.Notify(c, os.Kill)
+
+	// Block until a signal is received.
+	s := <-c
+	fmt.Println("Got signal:", s)
+	os.Exit(0)
+}
+
+func loadConfig(path string) (*mailRelayConfig, error) {
+	var cfg mailRelayConfig
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	parser := json.NewDecoder(file)
+	if err := parser.Decode(&cfg); err != nil {
+		return nil, err
+	}
+	return &cfg, nil
+}