[Webkit-unassigned] [Bug 242495] New: After onicecandidate, localDescription sometimes doesn't include the candidate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242495

            Bug ID: 242495
           Summary: After onicecandidate, localDescription sometimes
                    doesn't include the candidate
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: davidswalkabout at gmail.com
                CC: youennf at gmail.com

Occasionally our WebRTC page running on Safari/iOS 15.5 will do ICE-gathering and find 4+ IPv6 or private-IPv4 candidates (which aren't useful for our service) but then will find a relay candidate and pass it to our onicecandidate, where we log it, yet immediately afterwards the localDescription of the peer object will not contain the final, usable candidate.

Our telephony server doesn't support receiving one candidate at a time, so we need to send the localDescription, and we'd strongly prefer to do that as soon as there is a usable candidate.

I would expect that every candidate would be inserted into the pendingLocalDescription before being passed into onicecandidate, but I couldn't find any discussion of this at https://w3c.github.io/webrtc-pc/#dom-peerconnection-localdescription
I'm filing this bug because I suspect you will agree that pendingLocalDescription should be updated first. Also, there seems to be a race condition because we do not see this behavior every time.

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