func writer(ws *websocket.Conn) {
pingTicker := time.NewTicker(pingPeriod)
nodesTicker := time.NewTicker(nodesPeriod)
defer func() {
pingTicker.Stop()
nodesTicker.Stop()
ws.Close()
}()
for {
select {
case <-nodesTicker.C:
p := []byte(fmt.Sprintf("%v", nodesH))
if p != nil {
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteMessage(websocket.TextMessage, p); err != nil {
return
}
}
case <-pingTicker.C:
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
return
}
}
}
}
func (ws *WebSocker) writer(conn *websocket.Conn, user string, tmpl *template.Template) {
pingTicker := time.NewTicker(pingPeriod)
chl, chq := notifier.listen(user)
ws.log.Println(user, "connected")
defer func() {
pingTicker.Stop()
conn.Close()
close(chq)
ws.log.Println(user, "disconnected")
}()
for {
var buf bytes.Buffer
select {
case p := <-chl:
conn.SetWriteDeadline(time.Now().Add(writeWait))
buf.Reset()
if err := tmpl.Execute(&buf, p); err != nil {
ws.log.Println(err)
return
}
if err := conn.WriteMessage(websocket.TextMessage, buf.Bytes()); err != nil {
return
}
ws.log.Println("notified:", user)
case <-pingTicker.C:
conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := conn.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
ws.log.Println("ping:", err)
return
}
}
}
}
func (handler *handler) proxyConnectionTo(server *websocket.Conn) {
handler.logger.Debugf("Output Proxy: Starting to listen to server %v", server.RemoteAddr().String())
var logMessage []byte
defer server.Close()
count := 0
for {
_, data, err := server.ReadMessage()
if err != nil {
handler.logger.Errorf("Output Proxy: Error reading from the server - %v - %v", err, server.RemoteAddr().String())
handler.Done()
return
}
handler.logger.Debugf("Output Proxy: Got message from server %v bytes", len(logMessage))
count++
err = handler.writeMessage(data)
if err != nil {
handler.logger.Errorf("Output Proxy: Error writing to client websocket - %v", err)
return
}
}
}
func (bot *Bot) loop(conn *websocket.Conn) bool {
defer conn.Close()
for {
messageType, bytes, err := conn.ReadMessage()
if err != nil {
// ReadMessage returns an error if the connection is closed
return false
}
if messageType == websocket.BinaryMessage {
continue // ignore binary messages
}
event, err := unpackJSON(bytes)
if err != nil {
log.WithFields(log.Fields{
"raw bytes": bytes,
"error": err,
}).Warn("message could not be unpacked")
continue
}
log.WithFields(log.Fields{
"event": event,
}).Info("received event")
eventType, ok := event["type"]
if ok && eventType.(string) == "team_migration_started" {
return true
}
wrappers := bot.handle(event)
closeConnection := sendResponses(wrappers, conn)
if closeConnection {
return false
}
}
}
// Read responses from the tunnel and fulfill pending requests
func wsReader(rs *remoteServer, ws *websocket.Conn, wsTimeout time.Duration, ch chan int) {
var err error
log_token := cutToken(rs.token)
// continue reading until we get an error
for {
ws.SetReadDeadline(time.Time{}) // no timeout, there's the ping-pong for that
// read a message from the tunnel
var t int
var r io.Reader
t, r, err = ws.NextReader()
if err != nil {
break
}
if t != websocket.BinaryMessage {
err = fmt.Errorf("non-binary message received, type=%d", t)
break
}
// give the sender a fixed time to get us the data
ws.SetReadDeadline(time.Now().Add(wsTimeout))
// get request id
var id int16
_, err = fmt.Fscanf(io.LimitReader(r, 4), "%04x", &id)
if err != nil {
break
}
// read request itself, the size is limited by the SetReadLimit on the websocket
var buf []byte
buf, err = ioutil.ReadAll(r)
if err != nil {
break
}
rs.log.Info("WS RCV", "id", id, "ws", wsp(ws), "len", len(buf))
// try to match request
rs.requestSetMutex.Lock()
req := rs.requestSet[id]
rs.lastActivity = time.Now()
rs.requestSetMutex.Unlock()
// let's see...
if req != nil {
rb := responseBuffer{response: bytes.NewBuffer(buf)}
// try to enqueue response
select {
case req.replyChan <- rb:
// great!
default:
rs.log.Info("WS RCV can't enqueue response", "id", id, "ws", wsp(ws))
}
} else {
rs.log.Info("%s #%d: WS RCV orphan response", "id", id, "ws", wsp(ws))
}
}
// print error message
if err != nil {
rs.log.Info("WS closing", "token", log_token, "err", err.Error(), "ws", wsp(ws))
}
// close up shop
ch <- 0 // notify sender
time.Sleep(2 * time.Second)
ws.Close()
}
func ptySetupWs(ws *websocket.Conn, sizeFlag string) {
ptym, cmd := start()
setPtySize(ptym, sizeFlag)
go func() {
handleOutputWs(ptym, ws)
}()
go func() {
handleInputWs(ptym, ws)
}()
// Listen for a new winsize on stdin.
for {
var newSize string
_, scanErr := fmt.Scanln(&newSize)
if scanErr != nil {
fmt.Println("scan failed: ", scanErr)
}
setPtySize(ptym, newSize)
fmt.Println("new size: ", newSize)
}
stop(ptym, cmd)
ws.Close()
}
func (client *Client) ping(ws *websocket.Conn, addr string) {
log.WithField("port", client.Port).Infoln("DailTLS ok: " + addr)
info, err := client.getServerInfo()
if err != nil {
log.WithField("port", client.Port).Errorln("getServerInfo", err)
return
}
ticker := time.NewTicker(info.PingSecond * time.Second)
defer func() {
ticker.Stop()
ws.Close()
log.WithField("port", client.Port).Infoln("Ws closed")
}()
log.WithField("port", client.Port).Infoln("Ws started")
req := client.innerRequest("HEAD", HOST_OK)
for {
select {
case <-ticker.C:
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
res, err := client.h2Transport.RoundTrip(req.WithContext(ctx))
if err != nil || res.StatusCode != http.StatusOK {
cancel()
return
}
cancel()
}
}
}
// writer runs in a goroutine for each connected WS client. It emits all message returned by the observer.
func writer(ws *websocket.Conn, a *ApiHandlers) {
pingTicker := time.NewTicker(pingPeriod)
s := a.getDBSubscriber()
jww.INFO.Println("Opened WebSocket connection.")
defer func(is *subscriber) {
jww.INFO.Println("Closing WebSocket connection.")
is.quitChan <- true
pingTicker.Stop()
ws.Close()
}(s)
for {
select {
case msg := <-s.bufChan:
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteJSON(msg); err != nil {
return
}
case <-pingTicker.C:
ws.SetWriteDeadline(time.Now().Add(writeWait))
if err := ws.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
return
}
}
}
}
func (np *NatsProxy) activateWSProxySubject(conn *websocket.Conn, wsID string) {
np.addToWSMapper(conn, wsID)
np.conn.Subscribe("WS_OUT"+wsID, func(m *nats.Msg) {
err := conn.WriteMessage(websocket.TextMessage, m.Data)
if err != nil {
log.Println("Error writing a message", err)
}
})
go func() {
for {
if _, p, err := conn.ReadMessage(); err == nil {
np.conn.Publish("WS_IN"+wsID, p)
} else {
np.removeFromWSMapper(conn, wsID)
conn.Close()
// If websocket is closed normally RFC6455
// code 1000, then no error logged
if !websocket.IsCloseError(err, websocket.CloseNormalClosure) {
logWebsocketError(wsID, err)
}
break
}
}
}()
}
func PushMsg(ws *websocket.Conn, WSWriter chan []uint8) {
defer ws.Close()
for {
msg := <-WSWriter
if msg == nil {
continue
}
// write message to client
if err := ws.WriteMessage(websocket.TextMessage, []byte(msg)); err != nil {
log.Println("[ErrorInfo]", err.Error())
break
}
if string(msg) == "bye" {
break
}
}
endChan <- true
}
func (r *RancherService) pipeLogs(container *rancherClient.Container, conn *websocket.Conn) {
defer conn.Close()
log_name := strings.TrimPrefix(container.Name, r.context.ProjectName+"_")
logger := r.context.LoggerFactory.Create(log_name)
for {
messageType, bytes, err := conn.ReadMessage()
if messageType != websocket.TextMessage {
continue
}
if err == io.EOF {
return
} else if err != nil {
logrus.Errorf("Failed to read log: %v", err)
return
}
if len(bytes) <= 3 {
continue
}
if bytes[len(bytes)-1] != '\n' {
bytes = append(bytes, '\n')
}
message := bytes[3:]
if "01" == string(bytes[:2]) {
logger.Out(message)
} else {
logger.Err(message)
}
}
}
func (s *WebsocketServer) handleWebsocket(conn *websocket.Conn) {
//out.Debug("New WS connection: %s", conn)
var serializer Serializer
var payloadType int
if proto, ok := s.protocols[conn.Subprotocol()]; ok {
serializer = proto.serializer
payloadType = proto.payloadType
} else {
// TODO: this will not currently ever be hit because
// gorilla/websocket will reject the conncetion
// if the subprotocol isn't registered
switch conn.Subprotocol() {
case jsonWebsocketProtocol:
serializer = new(JSONSerializer)
payloadType = websocket.TextMessage
case msgpackWebsocketProtocol:
serializer = new(MessagePackSerializer)
payloadType = websocket.BinaryMessage
default:
conn.Close()
return
}
}
peer := websocketPeer{
conn: conn,
serializer: serializer,
messages: make(chan Message, 10),
payloadType: payloadType,
}
go peer.run()
logErr(s.Node.Accept(&peer))
}
func newWSConn(conn *websocket.Conn, pendingWriteNum int) *WSConn {
wsConn := new(WSConn)
wsConn.conn = conn
wsConn.writeChan = make(chan []byte, pendingWriteNum)
go func() {
for b := range wsConn.writeChan {
if b == nil {
break
}
err := conn.WriteMessage(websocket.BinaryMessage, b)
if err != nil {
break
}
}
conn.Close()
wsConn.Lock()
wsConn.closeFlag = true
wsConn.Unlock()
}()
return wsConn
}
func (s *ScaletService) Create(makeFrom, rplan, name, password, location string, doStart bool,
keys []int64, wait bool) (*Scalet, *http.Response, error) {
scalet := new(Scalet)
conn := new(websocket.Conn)
var wsserr error
if wait {
conn, wsserr = s.client.WSSConn()
defer conn.Close()
}
body := struct {
MakeFrom string `json:"make_from,omitempty"`
Rplan string `json:"rplan,omitempty"`
DoStart bool `json:"do_start,omitempty"`
Name string `json:"name,omitempty"`
Keys []int64 `json:"keys,omitempty"`
Password string `json:"password,omitempty"`
Location string `json:"location,omitempty"`
}{makeFrom, rplan, doStart, name, keys, password, location}
b, _ := json.Marshal(body)
res, err := s.client.ExecuteRequest("POST", "scalets", b, scalet)
if wait && wsserr == nil && res.Header.Get("VSCALE-TASK-ID") != "" {
_, err := s.client.WaitTask(conn, res.Header.Get("VSCALE-TASK-ID"))
return scalet, res, err
}
return scalet, res, err
}
func (s *ScaletService) Restore(CTID int64, makeFrom string, wait bool) (*Scalet, *http.Response, error) {
scalet := new(Scalet)
conn := new(websocket.Conn)
var wsserr error
if wait {
conn, wsserr = s.client.WSSConn()
defer conn.Close()
}
body := struct {
MakeFrom string `json:"make_from,omitempty"`
}{makeFrom}
b, _ := json.Marshal(body)
res, err := s.client.ExecuteRequest("PATCH", fmt.Sprintf("scalets/%d/rebuild", CTID), b, scalet)
if wait && wsserr == nil && res.Header.Get("VSCALE-TASK-ID") != "" {
_, err := s.client.WaitTask(conn, res.Header.Get("VSCALE-TASK-ID"))
return scalet, res, err
}
return scalet, res, err
}
func (s *ScaletService) Upgrade(CTID int64, rplan string, wait bool) (*Scalet, *http.Response, error) {
scalet := new(Scalet)
body := struct {
Rplan string `json:"rplan,omitempty"`
}{rplan}
b, _ := json.Marshal(body)
conn := new(websocket.Conn)
var wsserr error
if wait {
conn, wsserr = s.client.WSSConn()
defer conn.Close()
}
res, err := s.client.ExecuteRequest("POST", fmt.Sprint("scalets/", strconv.FormatInt(CTID, 10), "/upgrade"), b, scalet)
if wait && wsserr == nil && res.Header.Get("VSCALE-TASK-ID") != "" {
_, err := s.client.WaitTask(conn, res.Header.Get("VSCALE-TASK-ID"))
return scalet, res, err
}
return scalet, res, err
}
func PubSubHandler(conn *websocket.Conn, pubsubClient *redis.PubSub) {
for {
msgi, err := pubsubClient.ReceiveMessage()
if err != nil {
return
}
switch msg := interface{}(msgi).(type) {
case *redis.Message:
var json_blob interface{}
bytes_blob := []byte(msg.Payload)
if err := json.Unmarshal(bytes_blob, &json_blob); err != nil {
logger.Printf("[%s][error] failed to parse JSON %v, because %v", conn.RemoteAddr(), msg.Payload, err)
continue
}
if err := conn.WriteJSON(json_blob); err != nil {
logger.Printf("[%s][error] failed to send JSON, because %v", conn.RemoteAddr(), err)
conn.Close()
return
}
logger.Printf("[%s][send] OK", conn.RemoteAddr())
default:
logger.Printf("[%s][error] Unkown message: %s", conn.RemoteAddr(), msg)
return
}
}
}
func wait(conn *websocket.Conn) {
defer conn.Close()
for {
if _, _, err := conn.ReadMessage(); err != nil {
break
}
}
}
func removeConnectionFromRoom(conn *websocket.Conn, room string) {
meeting := getMeeting(room)
if meeting == nil {
conn.Close()
} else {
meeting.removeClient(conn)
}
}
func readLoop(c *websocket.Conn) {
for {
if _, _, err := c.NextReader(); err != nil {
c.Close()
break
}
}
}
// START READER OMIT
func reader(ws *websocket.Conn) {
defer ws.Close()
for {
if _, _, err := ws.ReadMessage(); err != nil { // HL
break
}
}
}
// Pick requests off the RemoteServer queue and send them into the tunnel
func wsWriter(rs *remoteServer, ws *websocket.Conn, ch chan int) {
var req *remoteRequest
var err error
for {
// fetch a request
select {
case req = <-rs.requestQueue:
// awesome...
case _ = <-ch:
// time to close shop
rs.log.Info("WS closing on signal", "ws", wsp(ws))
ws.Close()
return
}
//log.Printf("WS->%s#%d start %s", req.token, req.id, req.info)
// See whether the request has already expired
if req.deadline.Before(time.Now()) {
req.replyChan <- responseBuffer{
err: errors.New("Timeout before forwarding the request"),
}
req.log.Info("WS SND timeout before sending", "ago",
time.Now().Sub(req.deadline).Seconds())
continue
}
// write the request into the tunnel
ws.SetWriteDeadline(time.Now().Add(time.Minute))
var w io.WriteCloser
w, err = ws.NextWriter(websocket.BinaryMessage)
// got an error, reply with a "hey, retry" to the request handler
if err != nil {
break
}
// write the request Id
_, err = fmt.Fprintf(w, "%04x", req.id)
if err != nil {
break
}
// write the request itself
_, err = req.buffer.WriteTo(w)
if err != nil {
break
}
// done
err = w.Close()
if err != nil {
break
}
req.log.Info("WS SND", "info", req.info)
}
// tell the sender to retry the request
req.replyChan <- responseBuffer{err: RetryError}
req.log.Info("WS error causes retry")
// close up shop
ws.WriteControl(websocket.CloseMessage, nil, time.Now().Add(5*time.Second))
time.Sleep(2 * time.Second)
ws.Close()
}
func reader(ws *websocket.Conn) {
defer ws.Close()
for {
_, _, err := ws.ReadMessage()
if err != nil {
log.Println(err)
}
}
}
func closeConnection(conn *websocket.Conn) {
for oldconn := range connections.m {
removePlayer(conn, oldconn)
}
connections.Lock()
delete(connections.m, conn)
connections.Unlock()
conn.Close()
}
// wait for an event; do things that might trigger events, and check them when they are received
func waitForEvent(t *testing.T, con *websocket.Conn, eventid string, dieOnTimeout bool, f func(), check func(string, []byte) error) {
// go routine to wait for webscoket msg
gch := make(chan []byte) // good channel
ech := make(chan error) // error channel
go func() {
for {
_, p, err := con.ReadMessage()
if err != nil {
ech <- err
break
} else {
// if the event id isnt what we're waiting on
// ignore it
var response struct {
Event string `json:"event"`
}
if err := json.Unmarshal(p, &response); err != nil {
ech <- err
break
}
if response.Event == eventid {
gch <- p
break
}
}
}
}()
// do stuff (transactions)
f()
// wait for an event or 10 seconds
ticker := time.Tick(10 * time.Second)
select {
case <-ticker:
if dieOnTimeout {
con.Close()
t.Fatalf("%s event was not received in time", eventid)
}
// else that's great, we didn't hear the event
// and we shouldn't have
case p := <-gch:
if dieOnTimeout {
// message was received and expected
// run the check
err := check(eventid, p)
if err != nil {
t.Fatal(err)
}
} else {
con.Close()
t.Fatalf("%s event was not expected", eventid)
}
case err := <-ech:
t.Fatal(err)
}
}
// Run is the block's main loop. Here we listen on the different channels we set up.
func (b *FromWebsocket) Run() {
var ws *websocket.Conn
var url string
to, _ := time.ParseDuration("10s")
var handshakeDialer = &websocket.Dialer{
Subprotocols: []string{"p1", "p2"},
HandshakeTimeout: to,
}
listenWS := make(blocks.MsgChan)
wsHeader := http.Header{"Origin": {"http://localhost/"}}
toOut := make(blocks.MsgChan)
toError := make(chan error)
for {
select {
case msg := <-toOut:
b.out <- msg
case ruleI := <-b.inrule:
var err error
// set a parameter of the block
url, err = util.ParseString(ruleI, "url")
if err != nil {
b.Error(err)
continue
}
if ws != nil {
ws.Close()
}
ws, _, err = handshakeDialer.Dial(url, wsHeader)
if err != nil {
b.Error("could not connect to url")
break
}
ws.SetReadDeadline(time.Time{})
h := recvHandler{toOut, toError}
go h.recv(ws, listenWS)
case err := <-toError:
b.Error(err)
case <-b.quit:
// quit the block
return
case o := <-b.queryrule:
o <- map[string]interface{}{
"url": url,
}
case in := <-listenWS:
b.out <- in
}
}
}
func (ws *Websocket) Reader(c *goWs.Conn, closed chan<- bool) {
defer c.Close()
for {
messageType, _, err := c.NextReader()
if err != nil || messageType == goWs.CloseMessage {
break
}
}
closed <- true
}
func (c *appClient) registerConn(id string, conn *websocket.Conn) bool {
c.mtx.Lock()
defer c.mtx.Unlock()
if c.hasQuit() {
conn.Close()
return false
}
c.conns[id] = conn
return true
}
// Run is the block's main loop. Here we listen on the different channels we set up.
func (b *FromWebsocket) Run() {
var ws *websocket.Conn
var URL string
var handshakeDialer = &websocket.Dialer{
Subprotocols: []string{"p1", "p2"},
}
listenWS := make(chan interface{})
wsHeader := http.Header{"Origin": {"http://localhost/"}}
for {
select {
case ruleI := <-b.inrule:
var err error
// set a parameter of the block
r, ok := ruleI.(map[string]interface{})
if !ok {
b.Error("bad rule")
break
}
url, ok := r["url"]
if !ok {
b.Error("no url specified")
break
}
surl, ok := url.(string)
if !ok {
b.Error("error reading url")
break
}
if ws != nil {
ws.Close()
}
ws, _, err = handshakeDialer.Dial(surl, wsHeader)
if err != nil {
b.Error("could not connect to url")
break
}
ws.SetReadDeadline(time.Time{})
go recv(ws, listenWS)
URL = surl
case <-b.quit:
// quit the block
return
case o := <-b.queryrule:
o <- map[string]interface{}{
"url": URL,
}
case in := <-listenWS:
b.out <- in
}
}
}
// close connection with an error string.
func closeMessage(ws *websocket.Conn, errStr string) {
// close code 1008 is used for a generic "policy violation" message.
msg := websocket.FormatCloseMessage(websocket.ClosePolicyViolation, errStr)
log.Println("[DEBUG] Writing a close message of", string(msg))
err := ws.WriteMessage(websocket.CloseMessage, msg)
if err != nil {
log.Println("[ERROR] Could not write message back to user", err)
}
ws.Close()
return
}
