From 5687925513a621a98549434470941b02943b8691 Mon Sep 17 00:00:00 2001
From: Matthew Chen <charlesmchen@gmail.com>
Date: Thu, 2 Feb 2017 15:10:50 -0500
Subject: [PATCH] Prevent simultaneous incoming and outgoing calls from leaving
 CallService in a bad state.

// FREEBIE
---
 Signal/src/call/CallService.swift | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Signal/src/call/CallService.swift b/Signal/src/call/CallService.swift
index 2e578a8f1..d1460913e 100644
--- a/Signal/src/call/CallService.swift
+++ b/Signal/src/call/CallService.swift
@@ -230,6 +230,13 @@ protocol CallServiceObserver: class {
     public func handleOutgoingCall(_ call: SignalCall) -> Promise<Void> {
         AssertIsOnMainThread()
 
+        guard self.call == nil else {
+            let errorDescription = "\(TAG) call was unexpectedly already set."
+            Logger.error(errorDescription)
+            call.state = .localFailure
+            return Promise(error: CallError.assertionError(description: errorDescription))
+        }
+
         self.call = call
 
         let thread = TSContactThread.getOrCreateThread(contactId: call.remotePhoneNumber)