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main.go
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main.go
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package main
import (
"flag"
"log"
"os"
"github.com/nats-io/nats.go"
)
// NOTE: Can test with demo servers.
// nats-order-new -s demo.nats.io <subject> <msg>
// nats-order-new -s demo.nats.io:4443 <subject> <msg> (TLS version)
func usage() {
log.Printf("Usage: nats-order-new [-s server] [-creds file] <subject> <msg>\n")
flag.PrintDefaults()
}
func showUsageAndExit(exitcode int) {
usage()
os.Exit(exitcode)
}
func main() {
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)
}
// 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)
}
}