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main.go
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main.go
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package main
import (
"errors"
"flag"
"fmt"
"os"
"os/signal"
"path/filepath"
"runtime"
"strings"
"syscall"
"github.com/aricart/wsgnatsd/server"
"github.com/nats-io/nats-server/v2/logger"
)
var bridge *Bridge
var assetServer *server.AssetsServer
type Bridge struct {
*server.Opts
WsServer *server.WsServer
NatsServer *server.NatsServer
PidFile *os.File
}
func NewBridge(o *server.Opts) (*Bridge, error) {
var err error
var bridge Bridge
bridge.Opts = o
fi, err := os.Stat(bridge.PidDir)
if os.IsNotExist(err) {
bridge.Logger.Fatalf("piddir [%s] doesn't exist", bridge.PidDir)
}
if !fi.IsDir() {
bridge.Logger.Fatalf("piddir [%s] is not a directory", bridge.PidDir)
}
bridge.NatsServer, err = server.NewNatsServer(o)
if err != nil {
return nil, err
}
if bridge.NatsServer == nil {
return nil, nil
}
bridge.WsServer, err = server.NewWsServer(o)
if err != nil {
return nil, err
}
return &bridge, nil
}
func (b *Bridge) Start() error {
if err := b.NatsServer.Start(); err != nil {
return err
}
kind := "embedded"
if b.NatsServer == nil {
kind = "remote"
}
bridge.Logger.Noticef("Bridge using %s NATS server %s", kind, b.NatsServer.HostPort())
if err := b.WsServer.Start(); err != nil {
return err
}
if err := b.writePidFile(); err != nil {
return err
}
return nil
}
func (b *Bridge) Shutdown() {
b.WsServer.Shutdown()
b.NatsServer.Shutdown()
b.Cleanup()
}
func (b *Bridge) Cleanup() {
err := b.PidFile.Close()
if err != nil {
b.Logger.Errorf("Failed closing pid file: %v", err)
}
if err := os.Remove(b.pidPath()); err != nil {
b.Logger.Errorf("Failed removing pid file: %v", err)
}
}
func (b *Bridge) pidPath() string {
return filepath.Join(b.PidDir, fmt.Sprintf("wsgnatsd_%d.pid", os.Getpid()))
}
func (b *Bridge) writePidFile() error {
var err error
b.PidFile, err = os.Create(b.pidPath())
if err != nil {
return err
}
_, err = b.PidFile.Write([]byte(strings.Join([]string{b.WsServer.GetURL(), b.NatsServer.GetURL()}, "\n")))
if err != nil {
return err
}
return nil
}
func BridgeArgs() []string {
inlineArgs := -1
for i, a := range os.Args {
if a == "--" {
inlineArgs = i
break
}
}
var args []string
if inlineArgs == -1 {
args = os.Args[1:]
} else {
args = os.Args[1 : inlineArgs+1]
}
return args
}
func parseFlags() (*server.Opts, error) {
opts := flag.NewFlagSet("bridge-c", flag.ExitOnError)
var confFile string
c := server.DefaultOpts()
opts.StringVar(&confFile, "c", "", "configuration file")
opts.IntVar(&c.Port, "p", c.Port, "port - http port for asset server default is no asset server")
opts.StringVar(&c.Dir, "d", c.Dir, "dir - asset directory, requires depends port")
opts.StringVar(&c.WSHostPort, "whp", c.WSHostPort, "wshostport - (default is auto port)")
opts.StringVar(&c.RemoteNatsHostPort, "rhp", c.RemoteNatsHostPort, "remotenatshostport - disables embedded NATS and proxies requests to the specified hostport")
opts.StringVar(&c.CaFile, "ca", c.CaFile, "cafile - ca certificate file for asset and ws servers")
opts.StringVar(&c.CertFile, "cert", c.CertFile, "certfile - certificate file for asset and ws servers")
opts.StringVar(&c.KeyFile, "key", c.KeyFile, "keyfile - certificate key for asset and ws servers")
opts.StringVar(&c.PidDir, "pid", c.PidDir, "piddir - piddir path for auto assigned port information")
opts.BoolVar(&c.TextFrames, "text", c.TextFrames, "textframes - use text websocket frames")
opts.BoolVar(&c.Debug, "D", c.Debug, "debug - enable debugging output")
opts.BoolVar(&c.Trace, "V", c.Trace, "trace - enable tracing output")
a := BridgeArgs()
if err := opts.Parse(a); err != nil {
opts.Usage()
os.Exit(0)
}
if confFile != "" && len(a) > 0 {
return nil, errors.New("no additional flags for the bridge can be specified in the command")
}
if confFile != "" {
fc, err := server.LoadOpts(confFile)
if err != nil {
return nil, err
}
c = *fc
}
if c.KeyFile != "" || c.CertFile != "" {
if c.KeyFile == "" || c.CertFile == "" {
panic("if -cert or -key is specified, both must be supplied")
}
}
return &c, nil
}
func main() {
o, err := parseFlags()
if err != nil {
panic(err)
}
o.Logger = logger.NewStdLogger(true, o.Debug, o.Trace, true, true)
bridge, err = NewBridge(o)
if err != nil {
o.Logger.Errorf("Failed to create sub-systems: %v\n")
panic(err)
}
if bridge == nil {
// prob help option
return
}
if err := bridge.Start(); err != nil {
o.Logger.Errorf("Failed to start sub-systems: %v\n")
bridge.Shutdown()
panic(err)
}
if o.Port > 0 {
as, err := server.NewAssetsServer(o)
if err != nil {
panic(err)
}
if err := as.Start(); err != nil {
panic(err)
}
assetServer = as
}
handleSignals()
if bridge != nil {
runtime.Goexit()
}
}
// handle signals so we can orderly shutdown
func handleSignals() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT)
go func() {
for sig := range c {
switch sig {
case syscall.SIGINT:
if assetServer != nil {
assetServer.Shutdown()
}
bridge.Shutdown()
os.Exit(0)
}
}
}()
}