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Re: What is the closing state for?

From: Randell Jesup <randell-ietf@jesup.org>
Date: Fri, 24 Aug 2012 11:42:32 -0400
Message-ID: <5037A0E8.6080608@jesup.org>
To: public-webrtc@w3.org
On 8/24/2012 10:15 AM, Eric Rescorla wrote:
> Looking over the current specification I see that it specifies a "closing" state
> for the RTCPeerStateEnum (see S 5.1.6). However, I don't see any way
> to get into that state. The specification requires that when you call pc.close()
> you transition right to the CLOSED state:
>    When the close() method is invoked, the user agent must run the
> following steps:
>    If the RTCPeerConnection object's RTCPeerConnection readiness state
> is CLOSED (3), throw an INVALID_STATE_ERR exception.
>    Destroy the RTCPeerConnection ICE Agent, abruptly ending any active
> ICE processing and any active streaming, and releasing any relevant
> resources (e.g. TURN permissions).
>    Set the object's RTCPeerConnection readiness state to CLOSED (3).
> And looking through the document I see no references to any state transition
> that would bring the PC (as opposed to the DataChannel) to CLOSING.
> I propose we remove the CLOSING state.

This may be the right solution.  I believe the assumption may have been 
that Close would do a clean shutdown, or that when an app was (via 
application protocol) is in the process of a clean shutdown via 
signaling, the state would be closing.  (Perhaps set to CLOSING, send 
"BYE"-equivalent to peer, when peer says OK ACK the OK and call Close).  
But this only makes sense if the CLOSING state somehow helps us during 
that time period.

Randell Jesup
Received on Friday, 24 August 2012 15:43:26 UTC

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