Distinguish between localHangup, remoteHangup, and call failure.
This allows us to put CallKit in the proper state, ready to receive new
calls without having a backlog of phantom calls which haven't been
properly removed.
Note the "call error" occurs at the point ICE fails, which takes a
while. Anecdotally, like 10 seconds, which feels like a long to be
talking into the ether.
I briefly considered failing at 'disconnected', which happens much
sooner, but that's actually a recoverable state. E.g. if you toggle
airplane mode you can see that you bounce into `disconnected` and then
back to `connected`, so I don't think we'd want to fail the call as long
as WebRTC considers it "recoverable".
// FREEBIE
...in response to CR, move the AudioService off of the CallViewController
Adopt multiple observer pattern vs. a singular delegate. Doing so
required implementing some machinery to address the ARC (see:
Weak.swift)
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8 Cases considered:
(Silent Switch toggled vs. Silent Switch not-toggled)
x (App in Foreground vs. App in Background)
x (CallKit vs. NonCallKit)
CallKit already does the "right thing"
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We do this by manually managing the RTCAudioSession.
Unfortunately to do this we have to include a couple of RTC headers not
exported by the default build of WebRTC.framework (see: Libraries/WebRTC)
// FREEBIE
This is an effort to better define boundaries and simplify
relationships.
This also fixes a theoretical problem where CallKit was showing the in-app
call screen before the call was successfully answered, now we wait until
the action is fulfilled.
// FREEBIE
In the process, extracted the CallDelegate to allow the
CAllViewController to observe useful call state properties (call.state
and call.isMuted)
// FREEBIE
* Ensure NotificationsManager has dependencies
Otherwise it's easy to mess up the order of the required dependencies.
* move AccountManager into Environment, it's heavy to construct
// FREEBIE