Added test implementation for Nats subscriber

tools/nats-manager/main.go

@@ -0,0 +1,82 @@
+// Copyright (C) 2022 NHR@FAU, University Erlangen-Nuremberg.
+// All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/ClusterCockpit/cc-backend/internal/scheduler"
+	"github.com/nats-io/nats.go"
+)
+
+func usage() {
+	log.Printf("Usage: nats-pub [-s server] [-creds file] <subject> <msg>\n")
+	flag.PrintDefaults()
+}
+
+func showUsageAndExit(exitcode int) {
+	usage()
+	os.Exit(exitcode)
+}
+
+func setupPublisher() {
+	var urls = flag.String("s", nats.DefaultURL, "The nats server URLs (separated by comma)")
+	var userCreds = flag.String("creds", "", "User Credentials File")
+	var showHelp = flag.Bool("h", false, "Show help message")
+
+	log.SetFlags(0)
+	flag.Usage = usage
+	flag.Parse()
+
+	if *showHelp {
+		showUsageAndExit(0)
+	}
+
+	args := flag.Args()
+	if len(args) != 2 {
+		showUsageAndExit(1)
+	}
+
+	fmt.Printf("Hello Nats\n")
+
+	// Connect Options.
+	opts := []nats.Option{nats.Name("NATS Sample Publisher")}
+
+	// Use UserCredentials
+	if *userCreds != "" {
+		opts = append(opts, nats.UserCredentials(*userCreds))
+	}
+
+	// Connect to NATS
+	nc, err := nats.Connect(*urls, opts...)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer nc.Close()
+	subj, msg := args[0], []byte(args[1])
+
+	nc.Publish(subj, msg)
+	nc.Flush()
+
+	if err := nc.LastError(); err != nil {
+		log.Fatal(err)
+	} else {
+		log.Printf("Published [%s] : '%s'\n", subj, msg)
+	}
+
+	os.Exit(0)
+}
+
+func main() {
+	cfgData := []byte(`{"target": "localhost"}`)
+
+	var sch scheduler.SlurmNatsScheduler
+	// sch.URL = "nats://127.0.0.1:1223"
+	sch.Init(cfgData)
+	os.Exit(0)
+}