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main.go
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main.go
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// Package main implements a stand-alone nexus router service.
package main
import (
"flag"
"fmt"
"io"
"log"
"os"
"os/signal"
"strings"
"time"
"github.com/dtegapp/nexus/v3/router"
"github.com/dtegapp/nexus/v3/wamp"
)
func main() {
var (
cfgFile, realm string
wsAddr, tcpAddr, unixAddr string
showVersion, verbose bool
)
flag.StringVar(&cfgFile, "c", "", "configuration file location")
flag.StringVar(&realm, "realm", "", "realm uri to use for first realm")
flag.StringVar(&wsAddr, "ws", "", "websocket address:port to listen on")
flag.StringVar(&tcpAddr, "tcp", "", "tcp address:port to listen on")
flag.StringVar(&unixAddr, "unix", "", "unix socket path to listen on")
flag.BoolVar(&showVersion, "version", false, "print version")
flag.BoolVar(&verbose, "verbose", false, "enable verbose logging")
flag.Parse()
if showVersion {
fmt.Println("version", router.Version)
os.Exit(0)
}
var conf *Config
if cfgFile == "" {
if wsAddr == "" && tcpAddr == "" && unixAddr == "" {
fmt.Fprintln(os.Stderr, "No servers configured")
fmt.Fprintln(os.Stderr, "Please provide at least one of:")
printFlags("c", "tcp", "unix", "ws")
os.Exit(1)
}
conf = new(Config)
} else {
// Read config file.
conf = LoadConfig(cfgFile)
}
if realm != "" {
if len(conf.Router.RealmConfigs) == 0 {
rc := &router.RealmConfig{
AllowDisclose: true,
AnonymousAuth: true,
}
conf.Router.RealmConfigs = append(conf.Router.RealmConfigs, rc)
}
conf.Router.RealmConfigs[0].URI = wamp.URI(realm)
} else if len(conf.Router.RealmConfigs) == 0 {
fmt.Fprintln(os.Stderr, "No realms configured")
fmt.Fprintln(os.Stderr, "Please provide one of:")
printFlags("c", "realm")
os.Exit(1)
}
if verbose {
conf.Router.Debug = true
}
if wsAddr != "" {
conf.WebSocket.Address = wsAddr
}
if tcpAddr != "" {
conf.RawSocket.TCPAddress = tcpAddr
}
if unixAddr != "" {
conf.RawSocket.UnixAddress = unixAddr
}
var logger *log.Logger
if conf.LogPath == "" {
// If no log file specified, then log to stdout.
logger = log.New(os.Stdout, "", log.LstdFlags)
} else {
// Open the file to log to and set up logger.
f, err := os.OpenFile(conf.LogPath, os.O_RDWR|os.O_CREATE|os.O_APPEND,
0644)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
defer f.Close()
logger = log.New(f, "", log.LstdFlags)
}
// Create router and realms from config.
r, err := router.NewRouter(&conf.Router, logger)
if err != nil {
logger.Print(err)
os.Exit(1)
}
// Create and run servers.
var closers []io.Closer
if conf.WebSocket.Address != "" {
// Create a new websocket server with the router.
wss := router.NewWebsocketServer(r)
if conf.WebSocket.EnableCompression {
wss.Upgrader.EnableCompression = true
logger.Printf("Compression enabled")
}
if conf.WebSocket.EnableTrackingCookie {
wss.EnableTrackingCookie = true
logger.Printf("Tracking cookie enabled - not currently used")
}
if conf.WebSocket.EnableRequestCapture {
wss.EnableRequestCapture = true
logger.Printf("Request capture enabled - not currently used")
}
if conf.WebSocket.KeepAlive != 0 {
wss.KeepAlive = conf.WebSocket.KeepAlive
logger.Printf("Websocket heartbeat interval: %s", wss.KeepAlive)
}
if len(conf.WebSocket.AllowOrigins) != 0 {
e := wss.AllowOrigins(conf.WebSocket.AllowOrigins)
if e != nil {
logger.Print(e)
os.Exit(1)
}
logger.Println("Allowing origins matching:",
strings.Join(conf.WebSocket.AllowOrigins, "|"))
}
if conf.WebSocket.OutQueueSize != 0 {
wss.OutQueueSize = conf.WebSocket.OutQueueSize
logger.Printf("Websocket outbound queue size: %d", wss.OutQueueSize)
}
var closer io.Closer
var sockDesc string
if conf.WebSocket.CertFile != "" && conf.WebSocket.KeyFile != "" {
// Config has cert_file and key_file, so do TLS.
closer, err = wss.ListenAndServeTLS(conf.WebSocket.Address, nil,
conf.WebSocket.CertFile, conf.WebSocket.KeyFile)
sockDesc = "TLS websocket"
} else {
closer, err = wss.ListenAndServe(conf.WebSocket.Address)
sockDesc = "websocket"
}
if err != nil {
logger.Print("Cannot start websocket server: ", err)
os.Exit(1)
}
closers = append(closers, closer)
logger.Printf("Listening for %s connections on ws://%s/", sockDesc,
conf.WebSocket.Address)
}
if conf.RawSocket.TCPAddress != "" || conf.RawSocket.UnixAddress != "" {
// Create a new rawsocket server with the router.
rss := router.NewRawSocketServer(r)
rss.RecvLimit = conf.RawSocket.MaxMsgLen
if conf.RawSocket.OutQueueSize != 0 {
rss.OutQueueSize = conf.RawSocket.OutQueueSize
logger.Printf("raw socket outbound queue size: %d", rss.OutQueueSize)
}
if conf.RawSocket.TCPAddress != "" {
if conf.RawSocket.TCPKeepAliveInterval != 0 {
rss.KeepAlive = conf.RawSocket.TCPKeepAliveInterval
logger.Printf("tcp keep-alive interval: %s", rss.KeepAlive)
}
var closer io.Closer
var sockDesc string
if conf.RawSocket.CertFile != "" && conf.RawSocket.KeyFile != "" {
// Run TLS rawsocket TCP server.
closer, err = rss.ListenAndServeTLS("tcp",
conf.RawSocket.TCPAddress, nil, conf.RawSocket.CertFile,
conf.RawSocket.KeyFile)
sockDesc = "TLS socket"
} else {
// Run rawsocket TCP server.
closer, err = rss.ListenAndServe("tcp", conf.RawSocket.TCPAddress)
sockDesc = "socket"
}
if err != nil {
logger.Print("Cannot start TCP server: ", err)
os.Exit(1)
}
closers = append(closers, closer)
logger.Println("Listening for TCP", sockDesc, "connections on",
conf.RawSocket.TCPAddress)
}
if conf.RawSocket.UnixAddress != "" {
// Run rawsocket Unix server.
closer, err := rss.ListenAndServe("unix", conf.RawSocket.UnixAddress)
if err != nil {
logger.Print("Cannot start unix socket server: ", err)
os.Exit(1)
}
closers = append(closers, closer)
logger.Println("Listening for Unix socket connections on",
conf.RawSocket.UnixAddress)
}
}
if len(closers) == 0 {
logger.Print("No servers configured")
os.Exit(1)
}
// Shutdown server if SIGINT (CTRL-c) received.
shutdown := make(chan os.Signal, 1)
signal.Notify(shutdown, os.Interrupt)
<-shutdown
// If process does not exit in a few seconds, exit with error.
exitChan := make(chan struct{})
go func() {
select {
case <-time.After(5 * time.Second):
logger.Print("Router took too long to stop")
os.Exit(1)
case <-exitChan:
}
}()
logger.Print("Shutting down router...")
for i := range closers {
closers[i].Close()
}
r.Close()
close(exitChan)
}
func printFlags(flagNames ...string) {
for i := range flagNames {
f := flag.Lookup(flagNames[i])
if f == nil {
panic("no such flag: " + flagNames[i])
}
fmt.Fprintf(os.Stderr, " -%s string\n\t%s\n", f.Name, f.Usage)
}
}