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ws.go
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ws.go
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package centcom
import (
"encoding/json"
"errors"
"fmt"
color "github.com/acmacalister/skittles"
"github.com/centrifugal/centrifuge-go"
"github.com/centrifugal/centrifugo/libcentrifugo/auth"
"github.com/centrifugal/gocent"
"github.com/synw/centcom/state"
"time"
)
type Msg struct {
UID string
Channel string
Payload interface{}
}
type Cli struct {
Addr string
Key string
Http *gocent.Client
Conn centrifuge.Centrifuge
SubEvents *centrifuge.SubEventHandler
Subs map[string]centrifuge.Sub
Channels chan *Msg
HttpOk bool
IsConnected bool
User string
}
func (cli Cli) CheckHttp() error {
cli.Http = gocent.NewClient("http://"+cli.Addr, cli.Key, 5*time.Second)
// test the http connection
err := checkHttpConnection(&cli)
if err != nil {
return err
}
cli.HttpOk = true
return nil
}
func (cli Cli) Subscribe(channel string) error {
sub, err := cli.Conn.Subscribe(channel, cli.SubEvents)
if err != nil {
return err
}
cli.Subs[channel] = sub
if state.Verbosity > 1 {
msg := "Suscribed to channel " + channel
fmt.Println(ok(msg))
}
return nil
}
func (cli Cli) Unsubscribe(channel string) error {
sub, err := getSubscription(&cli, channel)
if err != nil {
return err
}
err = sub.Unsubscribe()
if err != nil {
return err
}
delete(cli.Subs, channel)
if state.Verbosity > 1 {
msg := "Unsuscribed to channel " + channel
fmt.Println(ok(msg))
}
return nil
}
func (cli Cli) Publish(channel string, payload interface{}) error {
if len(cli.Subs) == 0 {
msg := "No subscription found for channel " + channel
err := newErr(msg)
return err
}
sub, err := getSubscription(&cli, channel)
if err != nil {
return err
}
dataBytes, err := json.Marshal(payload)
if err != nil {
return err
}
sub.Publish(dataBytes)
if err != nil {
return err
}
if state.Verbosity > 2 {
msg := "Message sent into channel " + channel
fmt.Println(msg)
}
return nil
}
// constructors
func NewClient(addr string, key string, args ...string) *Cli {
user := "cli"
if len(args) > 0 {
user = args[0]
}
http := gocent.NewClient("http://"+addr, key, 5*time.Second)
var ws centrifuge.Centrifuge
var subevents *centrifuge.SubEventHandler
subs := make(map[string]centrifuge.Sub)
c := make(chan *Msg)
cl := Cli{addr, key, http, ws, subevents, subs, c, false, false, user}
return &cl
}
func NewMsg(uid string, channel_name string, payload interface{}) *Msg {
msg := &Msg{uid, channel_name, payload}
return msg
}
// initialization
func Connect(cli *Cli) error {
// Never show secret to client of your application. Keep it on your application backend only.
secret := cli.Key
// Application user ID.
user := cli.User
// Current timestamp as string.
timestamp := centrifuge.Timestamp()
// Empty info.
info := ""
// Generate client token so Centrifugo server can trust connection parameters received from client.
token := auth.GenerateClientToken(secret, user, timestamp, info)
creds := ¢rifuge.Credentials{
User: user,
Timestamp: timestamp,
Info: info,
Token: token,
}
onMessage := func(sub centrifuge.Sub, rawmsg centrifuge.Message) error {
//fmt.Println(fmt.Sprintf("New message received in channel %s: %#v", sub.Channel(), rawmsg))
channel := fmt.Sprintf("%s", sub.Channel())
msg, err := decodeCentrifugeMsg(channel, &rawmsg)
if err != nil {
msg := "Error decoding Centrifuge message: " + err.Error()
err := newErr(msg)
fmt.Println(err.Error())
}
cli.Channels <- msg
return nil
}
onJoin := func(sub centrifuge.Sub, msg centrifuge.ClientInfo) error {
if state.Verbosity > 2 {
fmt.Println(fmt.Sprintf("User %s joined channel %s with client ID %s", msg.User, sub.Channel(), msg.Client))
}
return nil
}
onLeave := func(sub centrifuge.Sub, msg centrifuge.ClientInfo) error {
if state.Verbosity > 2 {
fmt.Println(fmt.Sprintf("User %s left channel %s with client ID %s", msg.User, sub.Channel(), msg.Client))
}
return nil
}
onPrivateSub := func(c centrifuge.Centrifuge, req *centrifuge.PrivateRequest) (*centrifuge.PrivateSign, error) {
info := ""
sign := auth.GenerateChannelSign(cli.Key, req.ClientID, req.Channel, info)
privateSign := ¢rifuge.PrivateSign{Sign: sign, Info: info}
return privateSign, nil
}
onDisconnect := func(c centrifuge.Centrifuge) error {
fmt.Println("Disconnected")
err := c.Reconnect(centrifuge.DefaultBackoffReconnect)
if err != nil {
fmt.Println(err)
} else {
fmt.Println("Reconnected")
}
return nil
}
events := ¢rifuge.EventHandler{
OnPrivateSub: onPrivateSub,
OnDisconnect: onDisconnect,
}
subevents := ¢rifuge.SubEventHandler{
OnMessage: onMessage,
OnJoin: onJoin,
OnLeave: onLeave,
}
wsURL := "ws://" + cli.Addr + "/connection/websocket"
conn := centrifuge.NewCentrifuge(wsURL, creds, events, centrifuge.DefaultConfig)
err := conn.Connect()
if err != nil {
msg := "Error connecting to " + wsURL + " : " + err.Error()
err = newErr(msg)
return err
}
cli.Conn = conn
cli.SubEvents = subevents
if state.Verbosity > 0 {
msg := "Connected to " + wsURL
fmt.Println(ok(msg))
}
return nil
}
func DecodeHttpMsg(raw *gocent.Message) (*Msg, error) {
msg, err := decodeRawMessage(raw.Channel, raw.Data)
if err != nil {
return msg, err
}
msg.UID = raw.UID
return msg, nil
}
// internal methods
func getSubscription(cli *Cli, channel_name string) (centrifuge.Sub, error) {
for name, sub := range cli.Subs {
if name == channel_name {
return sub, nil
}
}
msg := "Can not find channel " + channel_name + " in server subscriptions"
err := newErr(msg)
var s centrifuge.Sub
return s, err
}
func decodeRawMessage(channel string, raw *json.RawMessage) (*Msg, error) {
msg := &Msg{}
msg.Channel = channel
byte, err := json.Marshal(raw)
if err != nil {
return msg, newErr(err.Error())
}
err = json.Unmarshal(byte, &msg.Payload)
if err != nil {
return msg, newErr(err.Error())
}
return msg, nil
}
func decodeCentrifugeMsg(channel string, centmsg *centrifuge.Message) (*Msg, error) {
var err error
msg, err := decodeRawMessage(channel, centmsg.Data)
if err != nil {
return msg, err
}
msg.UID = centmsg.UID
return msg, nil
}
func checkHttpConnection(cli *Cli) error {
_, err := cli.Http.Publish("$devnull", []byte(`{"test": "test"}`))
if err != nil {
return newErr(err.Error())
}
return nil
}
func ok(msg string) string {
msg = "[" + color.Green("ok") + "] " + msg
return msg
}
func newErr(msg string) error {
err := errors.New(msg)
return err
}