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Rework connection replacement.

Browse source 
We used to signal connection replacement by reusing the same connection
id.  This turned out to be racy, as we couldn't reliably discard old
answers after a connection id was refused.

We now use a new id for every new connection, and explicitly signal
stream replacement in the offer message.  This requires maintaining a
local id on the client side.
This commit is contained in:
Juliusz Chroboczek 2021-01-31 19:00:09 +01:00
parent 9d9db1a920
commit 14a4303664
8 changed files with 263 additions and 154 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
README.FRONTEND
View file

@ -114,11 +114,7 @@ this point, you may set up an `audio` or `video` component straight away,
or you may choose to wait until the `ondowntrack` callback is called.
After a new stream is created, `ondowntrack` will be called whenever
a track is added. If the `MediaStream` passed to `ondowntrack` differs
from the one previously received, then the stream has been torn down and
recreated, and you must drop all previously received tracks; in practice,
it is enough to set the `srcObject` property of the video component to the
new stream.
a track is added.
The `onstatus` callback is invoked whenever the client library detects
a change in the status of the stream; states `connected` and `complete`
@ -126,7 +122,10 @@ indicate a functioning stream; other states indicate that the stream is
not working right now but might recover in the future.
The `onclose` callback is called when the stream is destroyed, either by
the server or in response to a call to the `close` method.
the server or in response to a call to the `close` method. The optional
parameter is true when the stream is being replaced by a new stream; in
that case, the call to `onclose` will be followed with a call to
`onstream` with the same `localId` value.
## Pushing outgoing video streams
@ -145,6 +144,11 @@ localStream.getTracks().forEach(t => {
});
```
The `newUpStream` method takes an optional parameter. If this is set to
the `localId` property of an existing stream, then the existing stream
will be closed and the server will be informed that the new stream
replaces the existing stream.
See above for information about setting up the `labels` dictionary.
## Stream statistics

12
README.PROTOCOL
View file

@ -142,8 +142,8 @@ A stream is created by the sender with the `offer` message:
```javascript
{
type: 'offer',
kind: '' or 'renegotiate'
id: id,
replace: id,
source: source-id,
username: username,
sdp: sdp,
@ -151,12 +151,10 @@ A stream is created by the sender with the `offer` message:
}
```
If kind is the empty string, then this is a new offer that might or might
not replace an existing stream; if a stream with the same id exists, it
must be torn down before the new stream is created. If kind is
`renegotiate`, then a stream with the given id already exists, and the
receiving peer may either tear down the existing stream or merely perform
a renegotiation.
If a stream with the same id exists, then this is a renegotation;
otherwise this message creates a new stream. If the field `replace` is
not empty, then this request additionally requests that an existing stream
with the given id should be closed, and the new stream should replace it.
The field `sdp` contains the raw SDP string (i.e. the `sdp` field of
a JSEP session description). Galène will interpret the `nack`,

10
diskwriter/diskwriter.go
View file

@ -93,7 +93,7 @@ func (client *Client) Kick(id, user, message string) error {
return err
}
func (client *Client) PushConn(g *group.Group, id string, up conn.Up, tracks []conn.UpTrack) error {
func (client *Client) PushConn(g *group.Group, id string, up conn.Up, tracks []conn.UpTrack, replace string) error {
if client.group != g {
return nil
}
@ -105,6 +105,14 @@ func (client *Client) PushConn(g *group.Group, id string, up conn.Up, tracks []c
return errors.New("disk client is closed")
}
rp := client.down[replace]
if rp != nil {
rp.Close()
delete(client.down, replace)
} else {
log.Printf("Replacing unknown connection")
}
old := client.down[id]
if old != nil {
old.Close()

2
group/client.go
View file

@ -99,7 +99,7 @@ type Client interface {
Permissions() ClientPermissions
SetPermissions(ClientPermissions)
OverridePermissions(*Group) bool
PushConn(g *Group, id string, conn conn.Up, tracks []conn.UpTrack) error
PushConn(g *Group, id string, conn conn.Up, tracks []conn.UpTrack, replace string) error
PushClient(id, username string, add bool) error
}

15
rtpconn/rtpconn.go
View file

@ -335,6 +335,7 @@ type rtpUpConnection struct {
mu sync.Mutex
pushed bool
replace string
tracks []*rtpUpTrack
local []conn.Down
}
@ -347,6 +348,16 @@ func (up *rtpUpConnection) getTracks() []*rtpUpTrack {
return tracks
}
func (up *rtpUpConnection) getReplace(reset bool) string {
up.mu.Lock()
defer up.mu.Unlock()
replace := up.replace
if reset {
up.replace = ""
}
return replace
}
func (up *rtpUpConnection) Id() string {
return up.id
}
@ -443,6 +454,8 @@ func (up *rtpUpConnection) complete() bool {
func pushConnNow(up *rtpUpConnection, g *group.Group, cs []group.Client) {
up.mu.Lock()
up.pushed = true
replace := up.replace
up.replace = ""
tracks := make([]conn.UpTrack, len(up.tracks))
for i, t := range up.tracks {
tracks[i] = t
@ -450,7 +463,7 @@ func pushConnNow(up *rtpUpConnection, g *group.Group, cs []group.Client) {
up.mu.Unlock()
for _, c := range cs {
c.PushConn(g, up.id, up, tracks)
c.PushConn(g, up.id, up, tracks, replace)
}
}

134
rtpconn/webclient.go
View file

@ -169,6 +169,7 @@ type clientMessage struct {
Type string `json:"type"`
Kind string `json:"kind,omitempty"`
Id string `json:"id,omitempty"`
Replace string `json:"replace,omitempty"`
Source string `json:"source,omitempty"`
Dest string `json:"dest,omitempty"`
Username string `json:"username,omitempty"`
@ -246,17 +247,26 @@ func addUpConn(c *webClient, id string, labels map[string]string, offer string)
return conn, true, nil
}
func delUpConn(c *webClient, id string) bool {
var ErrUserMismatch = errors.New("user id mismatch")
func delUpConn(c *webClient, id string, userId string) (string, error) {
c.mu.Lock()
if c.up == nil {
c.mu.Unlock()
return false
return "", os.ErrNotExist
}
conn := c.up[id]
if conn == nil {
c.mu.Unlock()
return false
return "", os.ErrNotExist
}
if userId != "" && conn.userId != userId {
c.mu.Unlock()
return "", ErrUserMismatch
}
replace := conn.getReplace(true)
delete(c.up, id)
c.mu.Unlock()
@ -264,7 +274,7 @@ func delUpConn(c *webClient, id string) bool {
if g != nil {
go func(clients []group.Client) {
for _, c := range clients {
err := c.PushConn(g, conn.id, nil, nil)
err := c.PushConn(g, conn.id, nil, nil, replace)
if err != nil {
log.Printf("PushConn: %v", err)
}
@ -275,7 +285,7 @@ func delUpConn(c *webClient, id string) bool {
}
conn.pc.Close()
return true
return conn.replace, nil
}
func getDownConn(c *webClient, id string) *rtpDownConnection {
@ -355,13 +365,13 @@ func addDownConnHelper(c *webClient, conn *rtpDownConnection, remote conn.Up) er
return nil
}
func delDownConn(c *webClient, id string) bool {
func delDownConn(c *webClient, id string) error {
conn := delDownConnHelper(c, id)
if conn != nil {
conn.pc.Close()
return true
return nil
}
return false
return os.ErrNotExist
}
func delDownConnHelper(c *webClient, id string) *rtpDownConnection {
@ -429,7 +439,7 @@ func addDownTrack(c *webClient, conn *rtpDownConnection, remoteTrack conn.UpTrac
return sender, nil
}
func negotiate(c *webClient, down *rtpDownConnection, renegotiate, restartIce bool) error {
func negotiate(c *webClient, down *rtpDownConnection, restartIce bool, replace string) error {
if down.pc.SignalingState() == webrtc.SignalingStateHaveLocalOffer {
// avoid sending multiple offers back-to-back
if restartIce {
@ -470,17 +480,12 @@ func negotiate(c *webClient, down *rtpDownConnection, renegotiate, restartIce bo
}
}
kind := ""
if renegotiate {
kind = "renegotiate"
}
source, username := down.remote.User()
return c.write(clientMessage{
Type: "offer",
Kind: kind,
Id: down.id,
Replace: replace,
Source: source,
Username: username,
SDP: down.pc.LocalDescription().SDP,
@ -500,31 +505,21 @@ func sendICE(c *webClient, id string, candidate *webrtc.ICECandidate) error {
})
}
func gotOffer(c *webClient, id string, sdp string, renegotiate bool, labels map[string]string) error {
if !renegotiate {
// unless the client indicates that this is a compatible
// renegotiation, tear down the existing connection.
delUpConn(c, id)
}
up, isnew, err := addUpConn(c, id, labels, sdp)
func gotOffer(c *webClient, id string, sdp string, labels map[string]string, replace string) error {
up, _, err := addUpConn(c, id, labels, sdp)
if err != nil {
return err
}
up.userId = c.Id()
up.username = c.Username()
up.replace = replace
err = up.pc.SetRemoteDescription(webrtc.SessionDescription{
Type: webrtc.SDPTypeOffer,
SDP: sdp,
})
if err != nil {
if renegotiate && !isnew {
// create a new PC from scratch
log.Printf("SetRemoteDescription(offer): %v", err)
return gotOffer(c, id, sdp, false, labels)
}
return err
}
@ -679,8 +674,8 @@ func addDownConnTracks(c *webClient, remote conn.Up, tracks []conn.UpTrack) (*rt
return down, nil
}
func (c *webClient) PushConn(g *group.Group, id string, up conn.Up, tracks []conn.UpTrack) error {
err := c.action(pushConnAction{g, id, up, tracks})
func (c *webClient) PushConn(g *group.Group, id string, up conn.Up, tracks []conn.UpTrack, replace string) error {
err := c.action(pushConnAction{g, id, up, tracks, replace})
if err != nil {
return err
}
@ -750,6 +745,7 @@ type pushConnAction struct {
id string
conn conn.Up
tracks []conn.UpTrack
replace string
}
type pushConnsAction struct {
@ -811,15 +807,23 @@ func clientLoop(c *webClient, ws *websocket.Conn) error {
return nil
}
if a.conn == nil {
found := delDownConn(c, a.id)
if found {
if a.replace != "" {
err := delDownConn(
c, a.replace,
)
if err == nil {
c.write(clientMessage{
Type: "close",
Id: a.replace,
})
}
}
err := delDownConn(c, a.id)
if err == nil {
c.write(clientMessage{
Type: "close",
Id: a.id,
})
} else {
log.Printf("Deleting unknown " +
"down connection")
}
continue
}
@ -830,7 +834,9 @@ func clientLoop(c *webClient, ws *websocket.Conn) error {
return err
}
if down != nil {
err = negotiate(c, down, false, false)
err = negotiate(
c, down, false, a.replace,
)
if err != nil {
log.Printf(
"Negotiation failed: %v",
@ -852,13 +858,17 @@ func clientLoop(c *webClient, ws *websocket.Conn) error {
continue
}
tracks := u.getTracks()
replace := u.getReplace(false)
ts := make([]conn.UpTrack, len(tracks))
for i, t := range tracks {
ts[i] = t
}
go func(u *rtpUpConnection, ts []conn.UpTrack) {
go func(u *rtpUpConnection,
ts []conn.UpTrack,
replace string) {
err := a.client.PushConn(
g, u.id, u, ts,
g, u.id, u, ts, replace,
)
if err != nil {
log.Printf(
@ -866,11 +876,11 @@ func clientLoop(c *webClient, ws *websocket.Conn) error {
err,
)
}
}(u, ts)
}(u, ts, replace)
}
case connectionFailedAction:
if down := getDownConn(c, a.id); down != nil {
err := negotiate(c, down, true, true)
err := negotiate(c, down, true, "")
if err != nil {
return err
}
@ -883,7 +893,7 @@ func clientLoop(c *webClient, ws *websocket.Conn) error {
go c.PushConn(
c.group,
down.remote.Id(), down.remote,
tracks,
tracks, "",
)
} else if up := getUpConn(c, a.id); up != nil {
c.write(clientMessage{
@ -912,8 +922,12 @@ func clientLoop(c *webClient, ws *websocket.Conn) error {
if !c.permissions.Present {
up := getUpConns(c)
for _, u := range up {
found := delUpConn(c, u.id)
if found {
replace, err :=
delUpConn(c, u.id, c.id)
if err == nil {
if replace != "" {
delUpConn(c, replace, c.id)
}
failUpConnection(
c, u.id,
"permission denied",
@ -975,7 +989,7 @@ func leaveGroup(c *webClient) {
c.setRequested(map[string]uint32{})
if c.up != nil {
for id := range c.up {
delUpConn(c, id)
delUpConn(c, id, c.id)
}
}
@ -1158,15 +1172,16 @@ func handleClientMessage(c *webClient, m clientMessage) error {
return c.setRequested(m.Request)
case "offer":
if !c.permissions.Present {
if m.Replace != "" {
delUpConn(c, m.Replace, c.id)
}
c.write(clientMessage{
Type: "abort",
Id: m.Id,
})
return c.error(group.UserError("not authorised"))
}
err := gotOffer(
c, m.Id, m.SDP, m.Kind == "renegotiate", m.Labels,
)
err := gotOffer(c, m.Id, m.SDP, m.Labels, m.Replace)
if err != nil {
log.Printf("gotOffer: %v", err)
return failUpConnection(c, m.Id, "negotiation failed")
@ -1184,8 +1199,9 @@ func handleClientMessage(c *webClient, m clientMessage) error {
down := getDownConn(c, m.Id)
if down.negotiationNeeded > negotiationUnneeded {
err := negotiate(
c, down, true,
c, down,
down.negotiationNeeded == negotiationRestartIce,
"",
)
if err != nil {
return failDownConnection(
@ -1196,7 +1212,7 @@ func handleClientMessage(c *webClient, m clientMessage) error {
case "renegotiate":
down := getDownConn(c, m.Id)
if down != nil {
err := negotiate(c, down, true, true)
err := negotiate(c, down, true, "")
if err != nil {
return failDownConnection(
c, m.Id, "renegotiation failed",
@ -1206,14 +1222,22 @@ func handleClientMessage(c *webClient, m clientMessage) error {
log.Printf("Trying to renegotiate unknown connection")
}
case "close":
found := delUpConn(c, m.Id)
if !found {
log.Printf("Deleting unknown up connection %v", m.Id)
replace, err := delUpConn(c, m.Id, c.id)
if err != nil {
log.Printf("Deleting up connection %v: %v",
m.Id, err)
return nil
}
if replace != "" {
_, err := delUpConn(c, replace, c.id)
if err != nil && !os.IsNotExist(err) {
log.Printf("Replace up connection: %v", err)
}
}
case "abort":
found := delDownConn(c, m.Id)
if !found {
log.Printf("Attempted to abort unknown connection")
err := delDownConn(c, m.Id)
if err != nil {
log.Printf("Abort: %v", err)
}
c.write(clientMessage{
Type: "close",

82
static/galene.js
View file

@ -340,7 +340,7 @@ function gotClose(code, reason) {
function gotDownStream(c) {
c.onclose = function(replace) {
if(!replace)
delMedia(c.id);
delMedia(c.localId);
};
c.onerror = function(e) {
console.error(e);
@ -397,10 +397,9 @@ getButtonElement('unpresentbutton').onclick = function(e) {
};
function changePresentation() {
let id = findUpMedia('local');
if(id) {
addLocalMedia(id);
}
let c = findUpMedia('local');
if(c)
addLocalMedia(c.localId);
}
/**
@ -624,7 +623,7 @@ function gotUpStats(stats) {
* @param {boolean} value
*/
function setActive(c, value) {
let peer = document.getElementById('peer-' + c.id);
let peer = document.getElementById('peer-' + c.localId);
if(value)
peer.classList.add('peer-active');
else
@ -773,10 +772,10 @@ async function setMediaChoices(done) {
/**
* @param {string} [id]
* @param {string} [localId]
*/
function newUpStream(id) {
let c = serverConnection.newUpStream(id);
function newUpStream(localId) {
let c = serverConnection.newUpStream(localId);
c.onstatus = function(status) {
setMediaStatus(c);
};
@ -1012,9 +1011,9 @@ function isSafari() {
}
/**
* @param {string} [id]
* @param {string} [localId]
*/
async function addLocalMedia(id) {
async function addLocalMedia(localId) {
let settings = getSettings();
let audio = settings.audio ? {deviceId: settings.audio} : false;
@ -1039,13 +1038,7 @@ async function addLocalMedia(id) {
}
}
let old = id && serverConnection.up[id];
if(!audio && !video) {
if(old)
old.close();
return;
}
let old = serverConnection.findByLocalId(localId);
if(old && old.onclose) {
// make sure that the camera is released before we try to reopen it
old.onclose.call(old, true);
@ -1063,7 +1056,7 @@ async function addLocalMedia(id) {
setMediaChoices(true);
let c = newUpStream(id);
let c = newUpStream(localId);
c.kind = 'local';
c.stream = stream;
@ -1076,21 +1069,21 @@ async function addLocalMedia(id) {
stopStream(stream);
setFilter(c, null);
if(!replace)
delMedia(c.id);
delMedia(c.localId);
}
} catch(e) {
displayWarning(e);
c.onclose = replace => {
stopStream(c.stream);
if(!replace)
delMedia(c.id);
delMedia(c.localId);
}
}
} else {
c.onclose = replace => {
stopStream(c.stream);
if(!replace)
delMedia(c.id);
delMedia(c.localId);
}
}
@ -1144,7 +1137,7 @@ async function addShareMedia() {
c.onclose = replace => {
stopStream(stream);
if(!replace)
delMedia(c.id);
delMedia(c.localId);
}
stream.getTracks().forEach(t => {
c.pc.addTrack(t, stream);
@ -1180,13 +1173,13 @@ async function addFileMedia(file) {
c.onclose = function(replace) {
stopStream(c.stream);
let media = /** @type{HTMLVideoElement} */
(document.getElementById('media-' + this.id));
(document.getElementById('media-' + this.localId));
if(media && media.src) {
URL.revokeObjectURL(media.src);
media.src = null;
}
if(!replace)
delMedia(c.id);
delMedia(c.localId);
};
stream.onaddtrack = function(e) {
@ -1261,11 +1254,13 @@ function closeUpMediaKind(kind) {
/**
* @param {string} kind
* @returns {Stream}
*/
function findUpMedia(kind) {
for(let id in serverConnection.up) {
if(serverConnection.up[id].kind === kind)
return id;
let c = serverConnection.up[id]
if(c.kind === kind)
return c;
}
return null;
}
@ -1304,16 +1299,16 @@ function muteLocalTracks(mute) {
async function setMedia(c, isUp, mirror, video) {
let peersdiv = document.getElementById('peers');
let div = document.getElementById('peer-' + c.id);
let div = document.getElementById('peer-' + c.localId);
if(!div) {
div = document.createElement('div');
div.id = 'peer-' + c.id;
div.id = 'peer-' + c.localId;
div.classList.add('peer');
peersdiv.appendChild(div);
}
let media = /** @type {HTMLVideoElement} */
(document.getElementById('media-' + c.id));
(document.getElementById('media-' + c.localId));
if(media) {
if(video) {
throw new Error("Duplicate video");
@ -1331,21 +1326,24 @@ async function setMedia(c, isUp, mirror, video) {
media.autoplay = true;
/** @ts-ignore */
media.playsinline = true;
media.id = 'media-' + c.id;
media.id = 'media-' + c.localId;
div.appendChild(media);
if(!video)
addCustomControls(media, div, c);
}
if(mirror)
media.classList.add('mirror');
}
else
media.classList.remove('mirror');
if(!video && media.srcObject !== c.stream)
media.srcObject = c.stream;
let label = document.getElementById('label-' + c.id);
let label = document.getElementById('label-' + c.localId);
if(!label) {
label = document.createElement('div');
label.id = 'label-' + c.id;
label.id = 'label-' + c.localId;
label.classList.add('label');
div.appendChild(label);
}
@ -1382,7 +1380,7 @@ function cloneHTMLElement(elt) {
*/
function addCustomControls(media, container, c) {
media.controls = false;
let controls = document.getElementById('controls-' + c.id);
let controls = document.getElementById('controls-' + c.localId);
if(controls) {
console.warn('Attempted to add duplicate controls');
return;
@ -1391,7 +1389,7 @@ function addCustomControls(media, container, c) {
let template =
document.getElementById('videocontrols-template').firstElementChild;
controls = cloneHTMLElement(template);
controls.id = 'controls-' + c.id;
controls.id = 'controls-' + c.localId;
let volume = getVideoButton(controls, 'volume');
if(c.kind === 'local') {
@ -1508,16 +1506,16 @@ function registerControlHandlers(media, container) {
}
/**
* @param {string} id
* @param {string} localId
*/
function delMedia(id) {
function delMedia(localId) {
let mediadiv = document.getElementById('peers');
let peer = document.getElementById('peer-' + id);
let peer = document.getElementById('peer-' + localId);
if(!peer)
throw new Error('Removing unknown media');
let media = /** @type{HTMLVideoElement} */
(document.getElementById('media-' + id));
(document.getElementById('media-' + localId));
media.srcObject = null;
mediadiv.removeChild(peer);
@ -1534,7 +1532,7 @@ function setMediaStatus(c) {
let state = c && c.pc && c.pc.iceConnectionState;
let good = state === 'connected' || state === 'completed';
let media = document.getElementById('media-' + c.id);
let media = document.getElementById('media-' + c.localId);
if(!media) {
console.warn('Setting status of unknown media.');
return;
@ -1560,7 +1558,7 @@ function setMediaStatus(c) {
* @param {string} [fallback]
*/
function setLabel(c, fallback) {
let label = document.getElementById('label-' + c.id);
let label = document.getElementById('label-' + c.localId);
if(!label)
return;
let l = c.username;

120
static/protocol.js
View file

@ -36,15 +36,30 @@ function toHex(array) {
return a.reduce((x, y) => x + hex(y), '');
}
/** randomid returns a random string of 32 hex digits (16 bytes).
/**
* newRandomId returns a random string of 32 hex digits (16 bytes).
*
* @returns {string}
*/
function randomid() {
function newRandomId() {
let a = new Uint8Array(16);
crypto.getRandomValues(a);
return toHex(a);
}
let localIdCounter = 0;
/**
* newLocalId returns a string that is unique in this session.
*
* @returns {string}
*/
function newLocalId() {
let id = `${localIdCounter}`
localIdCounter++;
return id;
}
/**
* ServerConnection encapsulates a websocket connection to the server and
* all the associated streams.
@ -57,7 +72,7 @@ function ServerConnection() {
* @type {string}
* @const
*/
this.id = randomid();
this.id = newRandomId();
/**
* The group that we have joined, or null if we haven't joined yet.
*
@ -168,6 +183,7 @@ function ServerConnection() {
* @property {string} type
* @property {string} [kind]
* @property {string} [id]
* @property {string} [replace]
* @property {string} [source]
* @property {string} [dest]
* @property {string} [username]
@ -259,7 +275,7 @@ ServerConnection.prototype.connect = async function(url) {
break;
case 'offer':
sc.gotOffer(m.id, m.labels, m.source, m.username,
m.sdp, m.kind === 'renegotiate');
m.sdp, m.replace);
break;
case 'answer':
sc.gotAnswer(m.id, m.sdp);
@ -391,25 +407,51 @@ ServerConnection.prototype.request = function(what) {
};
/**
* newUpStream requests the creation of a new up stream.
*
* @param {string} [id] - The id of the stream to create.
* @param {string} localId
* @returns {Stream}
*/
ServerConnection.prototype.newUpStream = function(id) {
ServerConnection.prototype.findByLocalId = function(localId) {
if(!localId)
return null;
for(let id in serverConnection.up) {
let s = serverConnection.up[id];
if(s.localId == localId)
return s;
}
return null;
}
/**
* newUpStream requests the creation of a new up stream.
*
* @param {string} [localId]
* - The local id of the stream to create. If a stream already exists with
* the same local id, it is replaced with the new stream.
* @returns {Stream}
*/
ServerConnection.prototype.newUpStream = function(localId) {
let sc = this;
if(!id) {
id = randomid();
let id = newRandomId();
if(sc.up[id])
throw new Error('Eek!');
}
let pc = new RTCPeerConnection(sc.rtcConfiguration);
if(!pc)
throw new Error("Couldn't create peer connection");
if(sc.up[id])
sc.up[id].close();
let c = new Stream(this, id, pc, true);
let oldId = null;
if(localId) {
let old = sc.findByLocalId(localId);
oldId = old && old.id;
if(old)
old.close(true);
}
let c = new Stream(this, id, localId || newLocalId(), pc, true);
if(oldId)
c.replace = oldId;
sc.up[id] = c;
pc.onnegotiationneeded = async e => {
@ -518,26 +560,32 @@ ServerConnection.prototype.groupAction = function(kind, message) {
* @param {string} source
* @param {string} username
* @param {string} sdp
* @param {boolean} renegotiate
* @param {string} replace
* @function
*/
ServerConnection.prototype.gotOffer = async function(id, labels, source, username, sdp, renegotiate) {
ServerConnection.prototype.gotOffer = async function(id, labels, source, username, sdp, replace) {
let sc = this;
let c = sc.down[id];
if(c && !renegotiate) {
// SDP is rather inflexible as to what can be renegotiated.
// Unless the server indicates that this is a renegotiation with
// all parameters unchanged, tear down the existing connection.
c.close(true);
c = null;
}
if(sc.up[id])
throw new Error('Duplicate connection id');
let oldLocalId = null;
if(replace) {
let old = sc.down[replace];
if(old) {
oldLocalId = old.localId;
old.close(true);
} else
console.error("Replacing unknown stream");
}
let c = sc.down[id];
if(c && oldLocalId)
console.error("Replacing duplicate stream");
if(!c) {
let pc = new RTCPeerConnection(sc.rtcConfiguration);
c = new Stream(this, id, pc, false);
c = new Stream(this, id, oldLocalId || newLocalId(), pc, false);
sc.down[id] = c;
c.pc.onicecandidate = function(e) {
@ -709,11 +757,12 @@ ServerConnection.prototype.gotRemoteIce = async function(id, candidate) {
*
* @param {ServerConnection} sc
* @param {string} id
* @param {string} localId
* @param {RTCPeerConnection} pc
*
* @constructor
*/
function Stream(sc, id, pc, up) {
function Stream(sc, id, localId, pc, up) {
/**
* The associated ServerConnection.
*
@ -728,6 +777,13 @@ function Stream(sc, id, pc, up) {
* @const
*/
this.id = id;
/**
* The local id of this stream.
*
* @type {string}
* @const
*/
this.localId = localId;
/**
* Indicates whether the stream is in the client->server direction.
*
@ -779,6 +835,12 @@ function Stream(sc, id, pc, up) {
* @type {Object<string,string>}
*/
this.labelsByMid = {};
/**
* The id of the stream that we are currently replacing.
*
* @type {string}
*/
this.replace = null;
/**
* Indicates whether we have already sent a local description.
*
@ -899,7 +961,7 @@ Stream.prototype.close = function(replace) {
c.pc.close();
if(c.up && c.localDescriptionSent) {
if(c.up && !replace && c.localDescriptionSent) {
try {
c.sc.send({
type: 'close',
@ -1034,10 +1096,12 @@ Stream.prototype.negotiate = async function (restartIce) {
username: c.sc.username,
kind: this.localDescriptionSent ? 'renegotiate' : '',
id: c.id,
replace: this.replace,
labels: c.labelsByMid,
sdp: c.pc.localDescription.sdp,
});
this.localDescriptionSent = true;
this.replace = null;
c.flushLocalIceCandidates();
};