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List: otr-dev
Subject: Re: [OTR-dev] mpOTR: shutdown()
From: Abel Luck <abel () guardianproject ! info>
Date: 2012-07-24 14:22:21
Message-ID: 500EAF9D.6030705 () guardianproject ! info
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devrandom:
> A potential solution to the startup/shutdown user-experience is to
> maintain multiple overlapping sessions.
>
> So:
>
> * When a client joins or leaves, initiate startup of a new session
> * Always communicate on the newest session that is active
> * An active session is defined as a session that has startup completed
> and no shutdown initiated
> * When you have a new active session, initiate shutdown of any old ones
> * Long timeout on shutdowns (1 hour?)
>
> Advantages:
>
> * There will always be an active session so that chatting will not be
> disrupted
> * Clients will likely be able to complete shutdown so that they can have
> deniability even with flaky networks
> * New clients will be able to start chatting as soon as possible,
> without disrupting existing chat
>
> Disadvantages
>
> * Additional network bandwidth and CPU usage (mitigate through
> throttling creation rate?)
>
> Open questions:
>
> * How do we decide on the group membership for startup? Different
> clients may have different ideas of who is present due to network
> delays. Perhaps that is okay - make the session ID be a hash depending
> on members and just go ahead and create multiple sessions. Since you
> always chat on the newest session that initiated successfully,
> additional sessions are not an issue.
I think this is a good proposal. Definitely seems to be the best method
to ensure usability and meet existing expectations about how group chats
function.
As for group membership, I think this could be supplied by the
underlying transport (XMPP, IRC, etc.).
When Carol joins a chat/channel, she will likely see gibberish (current
conversation) until all other participants roll into a new session with
her. Ideally, the client implementations will be able to hide that
gibberish and simply provide a "Joining chat..." message until the
session has initiated.
~abel
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