/
gnats-proxy.go
89 lines (71 loc) · 1.88 KB
/
gnats-proxy.go
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package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"time"
"github.com/buger/jsonparser"
"github.com/julienschmidt/httprouter"
nats "github.com/nats-io/go-nats"
)
var debug bool
var nc *nats.Conn
func proxy(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
panic(err)
}
subject, err := jsonparser.GetString(body, "__subject")
if err != nil {
log.Printf("[ERROR] Subject property missing\n")
} else {
nc.Publish(subject, body)
}
if debug == true {
log.Printf("[INFO] %s\n", body)
}
w.WriteHeader(200)
// defer r.Body.Close()
r.Body.Close()
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: gnats-proxy [options]\n\n")
flag.PrintDefaults()
}
func main() {
var err error
var port uint
var certFile string
var keyFile string
var natsURL string
flag.UintVar(&port, "p", 8080, "`Port number`")
flag.StringVar(&certFile, "C", "", "Server certificate `file`")
flag.StringVar(&keyFile, "K", "", "Private key `file`")
flag.StringVar(&natsURL, "n", "nats://0.0.0.0:4222", "NATS server `URL`")
flag.BoolVar(&debug, "d", true, "Enable `debug` output")
flag.Usage = usage
flag.Parse()
router := httprouter.New()
router.POST("/", proxy)
proxyPort := fmt.Sprintf(":%d", port)
// if disconnected from NATS, try to reconnect indefinitely
nc, err = nats.Connect(natsURL, nats.MaxReconnects(-1), nats.ReconnectWait(5*time.Second))
if err != nil {
log.Fatal(err)
} else {
log.Printf("[INFO] Connected to NATS server: %s\n", natsURL)
}
if certFile != "" && keyFile != "" {
log.Printf("[INFO] Server listening on: https://0.0.0.0%s\n", proxyPort)
err = http.ListenAndServeTLS(proxyPort, certFile, keyFile, router)
} else {
log.Printf("[INFO] Server listening on: http://0.0.0.0%s\n", proxyPort)
err = http.ListenAndServe(proxyPort, router)
}
if err != nil {
log.Fatal(err)
}
}