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115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
package server
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import (
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"container/list"
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"sync"
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"github.com/gorilla/websocket"
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log "github.com/sirupsen/logrus"
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)
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type ttyShareSession struct {
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mainRWLock sync.RWMutex
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ttyProtoConnections *list.List
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isAlive bool
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lastWindowSizeMsg MsgTTYWinSize
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ptyHandler PTYHandler
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}
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func copyList(l *list.List) *list.List {
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newList := list.New()
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for e := l.Front(); e != nil; e = e.Next() {
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newList.PushBack(e.Value)
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}
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return newList
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}
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func newTTYShareSession(ptyHandler PTYHandler) *ttyShareSession {
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ttyShareSession := &ttyShareSession{
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ttyProtoConnections: list.New(),
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ptyHandler: ptyHandler,
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}
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return ttyShareSession
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}
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func (session *ttyShareSession) WindowSize(cols, rows int) error {
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session.mainRWLock.Lock()
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session.lastWindowSizeMsg = MsgTTYWinSize{Cols: cols, Rows: rows}
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session.mainRWLock.Unlock()
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session.forEachReceiverLock(func(rcvConn *TTYProtocolWSLocked) bool {
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rcvConn.SetWinSize(cols, rows)
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return true
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})
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return nil
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}
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func (session *ttyShareSession) Write(data []byte) (int, error) {
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session.forEachReceiverLock(func(rcvConn *TTYProtocolWSLocked) bool {
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rcvConn.Write(data)
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return true
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})
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return len(data), nil
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}
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// Runs the callback cb for each of the receivers in the list of the receivers, as it was when
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// this function was called. Note that there might be receivers which might have lost
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// the connection since this function was called.
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// Return false in the callback to not continue for the rest of the receivers
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func (session *ttyShareSession) forEachReceiverLock(cb func(rcvConn *TTYProtocolWSLocked) bool) {
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session.mainRWLock.RLock()
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// TODO: Maybe find a better way?
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rcvsCopy := copyList(session.ttyProtoConnections)
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session.mainRWLock.RUnlock()
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for receiverE := rcvsCopy.Front(); receiverE != nil; receiverE = receiverE.Next() {
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receiver := receiverE.Value.(*TTYProtocolWSLocked)
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if !cb(receiver) {
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break
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}
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}
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}
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// Will run on the TTYReceiver connection go routine (e.g.: on the websockets connection routine)
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// When HandleWSConnection will exit, the connection to the TTYReceiver will be closed
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func (session *ttyShareSession) HandleWSConnection(wsConn *websocket.Conn) {
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protoConn := NewTTYProtocolWSLocked(wsConn)
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session.mainRWLock.Lock()
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rcvHandleEl := session.ttyProtoConnections.PushBack(protoConn)
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winSize := session.lastWindowSizeMsg
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session.mainRWLock.Unlock()
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log.Debugf("New WS connection (%s). Serving ..", wsConn.RemoteAddr().String())
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// Sending the initial size of the window, if we have one
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protoConn.SetWinSize(winSize.Cols, winSize.Rows)
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// Wait until the TTYReceiver will close the connection on its end
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for {
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err := protoConn.ReadAndHandle(
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func(data []byte) {
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session.ptyHandler.Write(data)
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},
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func(cols, rows int) {
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session.ptyHandler.Refresh()
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},
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)
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if err != nil {
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log.Debugf("Finished the WS reading loop: %s", err.Error())
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break
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}
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}
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// Remove the recevier from the list of the receiver of this session, so we need to write-lock
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session.mainRWLock.Lock()
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session.ttyProtoConnections.Remove(rcvHandleEl)
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session.mainRWLock.Unlock()
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wsConn.Close()
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log.Debugf("Closed receiver connection")
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}
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