"Initial" working version, after cleanup.

cmd/hapz2m/main.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"hapz2m"
+
+	"context"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"regexp"
+	"syscall"
+)
+
+var (
+	// matches whole line comments in config file
+	CONFIG_COMMENTS_RE = regexp.MustCompile(`(?m)^\s*//.*$`)
+
+	// for MQTT server URI validation
+	SERVER_URL_RE = regexp.MustCompile(`^[a-z]+://.*:[0-9]{1,5}$`)
+)
+
+var (
+	configFile = flag.String("config", "/etc/hapz2m.conf", "config file")
+	dbPath     = flag.String("db", "/var/lib/hapz2m", "db path")
+)
+
+type config struct {
+	Server, Username, Password string
+}
+
+func parseConfig(fname string) (cfg *config, err error) {
+	cfgStr, err := os.ReadFile(fname)
+	if err != nil {
+		return
+	}
+
+	// remove line comments, json.Unmarshal can't parse them
+	cfgStr = CONFIG_COMMENTS_RE.ReplaceAllLiteral(cfgStr, []byte{})
+
+	cfg = &config{}
+	if err = json.Unmarshal(cfgStr, cfg); err != nil {
+		return
+	}
+
+	// sanity check
+	if cfg.Server == "" {
+		err = fmt.Errorf("MQTT server not specified")
+	} else if !SERVER_URL_RE.MatchString(cfg.Server) {
+		err = fmt.Errorf("invalid MQTT server: needs to be in URL format with port")
+	}
+
+	return
+}
+
+func main() {
+	flag.Parse()
+
+	cfg, err := parseConfig(*configFile)
+	if err != nil {
+		log.Fatalf("config file error: %v", err)
+	}
+
+	ctx, shutdown := context.WithCancel(context.Background())
+
+	br := hapz2m.NewBridge(ctx, *dbPath)
+	br.Server = cfg.Server
+	br.Username = cfg.Username
+	br.Password = cfg.Password
+
+	err = br.ConnectMQTT()
+	if err != nil {
+		log.Printf("cannot connect to MQTT: %s", err)
+		return
+	}
+
+	// listen for termination signals
+	c := make(chan os.Signal, 1) // use `1` here to appear go vet: https://github.com/golang/go/issues/45604
+	signal.Notify(c, os.Interrupt)
+	signal.Notify(c, syscall.SIGTERM)
+	go func() {
+		<-c
+		signal.Stop(c)
+		shutdown()
+	}()
+
+	br.WaitConfigured()
+
+	log.Println("hapz2m configured. starting HAP server...")
+
+	err = br.StartHAP()
+	if err != nil {
+		if err == http.ErrServerClosed {
+			log.Printf("HAP server was shutdown")
+		} else {
+			log.Printf("error starting server: %v", err)
+		}
+	}
+}