add idle support

go.mod

@@ -1,5 +1,5 @@
 module go.balki.me/tglistbot
 
-go 1.20
+go 1.21
 
-require go.balki.me/anyhttp v0.2.0
+require go.balki.me/anyhttp v0.3.0

go.sum

@@ -1,2 +1,2 @@
-go.balki.me/anyhttp v0.2.0 h1:W6aGcmjF5CMJvJYtbYCywxnYoErFhFc76vwaqUG5FAQ=
+go.balki.me/anyhttp v0.3.0 h1:WtBQ0rnkg567sX/O4ij/+qBbdCIUt5VURSe718sITBY=
-go.balki.me/anyhttp v0.2.0/go.mod h1:JhfekOIjgVODoVqUCficjpIgmB3wwlB7jhN0eN2EZ/s=
+go.balki.me/anyhttp v0.3.0/go.mod h1:JhfekOIjgVODoVqUCficjpIgmB3wwlB7jhN0eN2EZ/s=

main.go

@@ -3,6 +3,7 @@ package main
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -16,6 +17,7 @@ import (
 	"time"
 
 	"go.balki.me/anyhttp"
+	"go.balki.me/anyhttp/idle"
 	"go.balki.me/tglistbot/glist"
 )
 
@@ -25,9 +27,10 @@ var apiToken string
 
 var usage string = `Telegram List bot
 Environment variables:
-TGLB_API_TOKEN (required): See https://core.telegram.org/bots#how-do-i-create-a-bot
+TGLB_API_TOKEN (required)      : See https://core.telegram.org/bots#how-do-i-create-a-bot
-TGLB_PORT (default 28923): Set numerical port or unix//run/path.sock for unix socket
+TGLB_ADDR 	   (default 28923) : See https://pkg.go.dev/go.balki.me/anyhttp#readme-address-syntax
-TGLB_DATA_PATH (default .): Directory path where list data is stored
+TGLB_DATA_PATH (default .)     : Directory path where list data is stored
+TGLB_TIMEOUT   (default 30m)   : Timeout to auto shutdown if using systemd-fd, See https://pkg.go.dev/time#ParseDuration
 `
 
 func main() {
@@ -60,6 +63,18 @@ func main() {
 		return dataPath
 	}()
 
+	timeout := func() time.Duration {
+		timeoutStr := os.Getenv("TGLB_TIMEOUT")
+		if timeoutStr == "" {
+			return 30 * time.Minute
+		}
+		timeout, err := time.ParseDuration(timeoutStr)
+		if err != nil {
+			log.Panicf("Invalid timeout: %q\n", timeoutStr)
+		}
+		return timeout
+	}()
+
 	glist.DataPath = dataPath
 
 	version := func() string {
@@ -154,7 +169,24 @@ func main() {
 
 		}
 	})
-	log.Panicln(anyhttp.ListenAndServe(addr, nil))
+	addrType, server, done, err := anyhttp.Serve(addr, idle.WrapHandler(nil))
+	if err != nil {
+		log.Panicln(err)
+	}
+	if addrType == anyhttp.SystemdFD {
+		log.Println("server started")
+		if err := idle.Wait(timeout); err != nil {
+			log.Panicln(err)
+		}
+		log.Printf("server idle for %v, shutting down\n", timeout)
+		ctx, cancel := context.WithTimeout(context.Background(), 1*time.Minute) // Don't want any stuck connections
+		defer cancel()
+		if err := server.Shutdown(ctx); err != nil {
+			log.Panicln(err)
+		}
+	} else {
+		<-done
+	}
 }
 
 func handleTextAdded(gl *glist.GList, text string) {