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// FREEBIE
pull/1/head
Matthew Chen 8 years ago
parent af289145b5
commit d6c849eab3
1 changed files with 88 additions and 90 deletions
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178
Signal/src/call/CallService.swift
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@ -15,7 +15,7 @@ import WebRTC
* ## Signaling
*
* Signaling refers to the setup and tear down of the connection. Before the connection is established, this must happen
* out of band (using Signal Service), but once the connection is established it's possible to publish updates
* out of band (using Signal Service), but once the connection is established it's possible to publish updates
* (like hangup) via the established channel.
*
* Signaling state is synchronized on the main thread and only mutated in the handleXXX family of methods.
@ -34,7 +34,7 @@ import WebRTC
* | Caller | Callee |
* +----------------------------+-------------------------+
* Start outgoing call: `handleOutgoingCall`...
--[SS.CallOffer]-->
--[SS.CallOffer]-->
* ...and start generating ICE updates.
* As ICE candidates are generated, `handleLocalAddedIceCandidate` is called.
* and we *store* the ICE updates for later.
@ -44,7 +44,7 @@ import WebRTC
* <--[SS.CallAnswer]--
* Start generating ICE updates.
* As they are generated `handleLocalAddedIceCandidate` is called
which immediately sends the ICE updates to the Caller.
which immediately sends the ICE updates to the Caller.
* <--[SS.ICEUpdate]-- (sent multiple times)
*
* Received CallAnswer: `handleReceivedAnswer`
@ -126,10 +126,10 @@ protocol CallServiceObserver: class {
/**
* In the process of establishing a connection between the clients (ICE process) we must exchange ICE updates.
* Because this happens via Signal Service it's possible the callee user has not accepted any change in the caller's
* Because this happens via Signal Service it's possible the callee user has not accepted any change in the caller's
* identity. In which case *each* ICE update would cause an "identity change" warning on the callee's device. Since
* this could be several messages, the caller stores all ICE updates until receiving positive confirmation that the
* callee has received a message from us. This positive confirmation comes in the form of the callees `CallAnswer`
* this could be several messages, the caller stores all ICE updates until receiving positive confirmation that the
* callee has received a message from us. This positive confirmation comes in the form of the callees `CallAnswer`
* message.
*/
var sendIceUpdatesImmediately = true
@ -252,24 +252,22 @@ protocol CallServiceObserver: class {
self.peerConnectionClient = peerConnectionClient
let sessionDescription = self.peerConnectionClient!.createOffer()
return sessionDescription
}.then(on: DispatchQueue.main) { (sessionDescription: HardenedRTCSessionDescription) -> Promise<Void> in
return self.peerConnectionClient!.setLocalSessionDescription(sessionDescription).then(on: DispatchQueue.main) {
let offerMessage = OWSCallOfferMessage(callId: call.signalingId, sessionDescription: sessionDescription.sdp)
let callMessage = OWSOutgoingCallMessage(thread: thread, offerMessage: offerMessage)
let result = self.messageSender.sendCallMessage(callMessage)
return result
}
}.catch(on: DispatchQueue.main) { error in
Logger.error("\(self.TAG) placing call failed with error: \(error)")
if let callError = error as? CallError {
self.handleFailedCall(error: callError)
} else {
let externalError = CallError.externalError(underlyingError: error)
self.handleFailedCall(error: externalError)
}
return self.peerConnectionClient!.createOffer()
}.then(on: DispatchQueue.main) { (sessionDescription: HardenedRTCSessionDescription) -> Promise<Void> in
return self.peerConnectionClient!.setLocalSessionDescription(sessionDescription).then(on: DispatchQueue.main) {
let offerMessage = OWSCallOfferMessage(callId: call.signalingId, sessionDescription: sessionDescription.sdp)
let callMessage = OWSOutgoingCallMessage(thread: thread, offerMessage: offerMessage)
return self.messageSender.sendCallMessage(callMessage)
}
}.catch(on: DispatchQueue.main) { error in
Logger.error("\(self.TAG) placing call failed with error: \(error)")
if let callError = error as? CallError {
self.handleFailedCall(error: callError)
} else {
let externalError = CallError.externalError(underlyingError: error)
self.handleFailedCall(error: externalError)
}
}
}
@ -309,13 +307,13 @@ protocol CallServiceObserver: class {
let sessionDescription = RTCSessionDescription(type: .answer, sdp: sessionDescription)
_ = peerConnectionClient.setRemoteSessionDescription(sessionDescription).then {
Logger.debug("\(self.TAG) successfully set remote description")
}.catch(on: DispatchQueue.main) { error in
if let callError = error as? CallError {
self.handleFailedCall(error: callError)
} else {
let externalError = CallError.externalError(underlyingError: error)
self.handleFailedCall(error: externalError)
}
}.catch(on: DispatchQueue.main) { error in
if let callError = error as? CallError {
self.handleFailedCall(error: callError)
} else {
let externalError = CallError.externalError(underlyingError: error)
self.handleFailedCall(error: externalError)
}
}
}
@ -394,47 +392,47 @@ protocol CallServiceObserver: class {
incomingCallPromise = firstly {
return getIceServers()
}.then(on: DispatchQueue.main) { (iceServers: [RTCIceServer]) -> Promise<HardenedRTCSessionDescription> in
// FIXME for first time call recipients I think we'll see mic/camera permission requests here,
// even though, from the users perspective, no incoming call is yet visible.
self.peerConnectionClient = PeerConnectionClient(iceServers: iceServers, delegate: self)
}.then(on: DispatchQueue.main) { (iceServers: [RTCIceServer]) -> Promise<HardenedRTCSessionDescription> in
// FIXME for first time call recipients I think we'll see mic/camera permission requests here,
// even though, from the users perspective, no incoming call is yet visible.
self.peerConnectionClient = PeerConnectionClient(iceServers: iceServers, delegate: self)
let offerSessionDescription = RTCSessionDescription(type: .offer, sdp: callerSessionDescription)
let constraints = RTCMediaConstraints(mandatoryConstraints: nil, optionalConstraints: nil)
let offerSessionDescription = RTCSessionDescription(type: .offer, sdp: callerSessionDescription)
let constraints = RTCMediaConstraints(mandatoryConstraints: nil, optionalConstraints: nil)
// Find a sessionDescription compatible with my constraints and the remote sessionDescription
return self.peerConnectionClient!.negotiateSessionDescription(remoteDescription: offerSessionDescription, constraints: constraints)
}.then(on: DispatchQueue.main) { (negotiatedSessionDescription: HardenedRTCSessionDescription) in
Logger.debug("\(self.TAG) set the remote description")
// Find a sessionDescription compatible with my constraints and the remote sessionDescription
return self.peerConnectionClient!.negotiateSessionDescription(remoteDescription: offerSessionDescription, constraints: constraints)
}.then(on: DispatchQueue.main) { (negotiatedSessionDescription: HardenedRTCSessionDescription) in
Logger.debug("\(self.TAG) set the remote description")
let answerMessage = OWSCallAnswerMessage(callId: newCall.signalingId, sessionDescription: negotiatedSessionDescription.sdp)
let callAnswerMessage = OWSOutgoingCallMessage(thread: thread, answerMessage: answerMessage)
let answerMessage = OWSCallAnswerMessage(callId: newCall.signalingId, sessionDescription: negotiatedSessionDescription.sdp)
let callAnswerMessage = OWSOutgoingCallMessage(thread: thread, answerMessage: answerMessage)
return self.messageSender.sendCallMessage(callAnswerMessage)
}.then(on: DispatchQueue.main) {
Logger.debug("\(self.TAG) successfully sent callAnswerMessage")
return self.messageSender.sendCallMessage(callAnswerMessage)
}.then(on: DispatchQueue.main) {
Logger.debug("\(self.TAG) successfully sent callAnswerMessage")
let (promise, fulfill, _) = Promise<Void>.pending()
let (promise, fulfill, _) = Promise<Void>.pending()
let timeout: Promise<Void> = after(interval: TimeInterval(timeoutSeconds)).then { () -> Void in
// rejecting a promise by throwing is safely a no-op if the promise has already been fulfilled
throw CallError.timeout(description: "timed out waiting for call to connect")
}
let timeout: Promise<Void> = after(interval: TimeInterval(timeoutSeconds)).then { () -> Void in
// rejecting a promise by throwing is safely a no-op if the promise has already been fulfilled
throw CallError.timeout(description: "timed out waiting for call to connect")
}
// This will be fulfilled (potentially) by the RTCDataChannel delegate method
self.fulfillCallConnectedPromise = fulfill
// This will be fulfilled (potentially) by the RTCDataChannel delegate method
self.fulfillCallConnectedPromise = fulfill
return race(promise, timeout)
}.catch(on: DispatchQueue.main) { error in
if let callError = error as? CallError {
self.handleFailedCall(error: callError)
} else {
let externalError = CallError.externalError(underlyingError: error)
self.handleFailedCall(error: externalError)
}
}.always {
Logger.debug("\(self.TAG) ending background task awaiting inbound call connection")
UIApplication.shared.endBackgroundTask(backgroundTask)
return race(promise, timeout)
}.catch(on: DispatchQueue.main) { error in
if let callError = error as? CallError {
self.handleFailedCall(error: callError)
} else {
let externalError = CallError.externalError(underlyingError: error)
self.handleFailedCall(error: externalError)
}
}.always {
Logger.debug("\(self.TAG) ending background task awaiting inbound call connection")
UIApplication.shared.endBackgroundTask(backgroundTask)
}
}
@ -474,7 +472,7 @@ protocol CallServiceObserver: class {
}
/**
* Local client (could be caller or callee) generated some connectivity information that we should send to the
* Local client (could be caller or callee) generated some connectivity information that we should send to the
* remote client.
*/
private func handleLocalAddedIceCandidate(_ iceCandidate: RTCIceCandidate) {
@ -513,7 +511,7 @@ protocol CallServiceObserver: class {
/**
* The clients can now communicate via WebRTC.
*
* Called by both caller and callee. Compatible ICE messages have been exchanged between the local and remote
* Called by both caller and callee. Compatible ICE messages have been exchanged between the local and remote
* client.
*/
private func handleIceConnected() {
@ -750,8 +748,8 @@ protocol CallServiceObserver: class {
let callMessage = OWSOutgoingCallMessage(thread: thread, hangupMessage: hangupMessage)
_ = self.messageSender.sendCallMessage(callMessage).then(on: DispatchQueue.main) {
Logger.debug("\(self.TAG) successfully sent hangup call message to \(thread)")
}.catch(on: DispatchQueue.main) { error in
Logger.error("\(self.TAG) failed to send hangup call message to \(thread) with error: \(error)")
}.catch(on: DispatchQueue.main) { error in
Logger.error("\(self.TAG) failed to send hangup call message to \(thread) with error: \(error)")
}
terminateCall()
@ -838,11 +836,11 @@ protocol CallServiceObserver: class {
}
/**
* Local client received a message on the WebRTC data channel.
* Local client received a message on the WebRTC data channel.
*
* The WebRTC data channel is a faster signaling channel than out of band Signal Service messages. Once it's
* established we use it to communicate further signaling information. The one sort-of exception is that with
* hangup messages we redundantly send a Signal Service hangup message, which is more reliable, and since the hangup
* The WebRTC data channel is a faster signaling channel than out of band Signal Service messages. Once it's
* established we use it to communicate further signaling information. The one sort-of exception is that with
* hangup messages we redundantly send a Signal Service hangup message, which is more reliable, and since the hangup
* action is idemptotent, there's no harm done.
*
* Used by both Incoming and Outgoing calls.
@ -956,24 +954,24 @@ protocol CallServiceObserver: class {
return firstly {
return accountManager.getTurnServerInfo()
}.then(on: DispatchQueue.main) { turnServerInfo -> [RTCIceServer] in
Logger.debug("\(self.TAG) got turn server urls: \(turnServerInfo.urls)")
return turnServerInfo.urls.map { url in
if url.hasPrefix("turn") {
// Only "turn:" servers require authentication. Don't include the credentials to other ICE servers
// as 1.) they aren't used, and 2.) the non-turn servers might not be under our control.
// e.g. we use a public fallback STUN server.
return RTCIceServer(urlStrings: [url], username: turnServerInfo.username, credential: turnServerInfo.password)
} else {
return RTCIceServer(urlStrings: [url])
}
} + [CallService.fallbackIceServer]
}.recover { error -> [RTCIceServer] in
Logger.error("\(self.TAG) fetching ICE servers failed with error: \(error)")
Logger.warn("\(self.TAG) using fallback ICE Servers")
return [CallService.fallbackIceServer]
}.then(on: DispatchQueue.main) { turnServerInfo -> [RTCIceServer] in
Logger.debug("\(self.TAG) got turn server urls: \(turnServerInfo.urls)")
return turnServerInfo.urls.map { url in
if url.hasPrefix("turn") {
// Only "turn:" servers require authentication. Don't include the credentials to other ICE servers
// as 1.) they aren't used, and 2.) the non-turn servers might not be under our control.
// e.g. we use a public fallback STUN server.
return RTCIceServer(urlStrings: [url], username: turnServerInfo.username, credential: turnServerInfo.password)
} else {
return RTCIceServer(urlStrings: [url])
}
} + [CallService.fallbackIceServer]
}.recover { error -> [RTCIceServer] in
Logger.error("\(self.TAG) fetching ICE servers failed with error: \(error)")
Logger.warn("\(self.TAG) using fallback ICE Servers")
return [CallService.fallbackIceServer]
}
}

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