56 lines
2.4 KiB
Markdown
56 lines
2.4 KiB
Markdown
Had to toss out my XMPP presence hack. Turns out that, at least in Google
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Talk, presence info is not sent to clients that have marked themselves
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unavailable, and that means the assistant would not see notifications, as it
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was nearly always marked unavailable as part of the hack.
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I tried writing a test program that uses XMPP personal eventing, only
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to find that Google Talk rejected my messages. I'm not 100% sure my
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messages were right, but I was directly copying the example in the RFC,
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and prosody accepted them. I could not seem to get a list of extensions out
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of Google Talk either, so I don't know if it doesn't support personal
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eventing, or perhaps only supports certian specific types of events.
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So, plan C... using XMPP [presence extended content](http://xmpp.org/rfcs/rfc6121.html#presence-extended).
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The assistant generates a presence message tagged "xa" (Extended Away),
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which hopefully will make it not seem present to clients.
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And to that presence message, I add my own XML element:
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<git-annex xmlns='git-annex' push="uuid,uuid" />
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This is all entirely legal, and not at all a hack.
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(Aside from this not really being presence info.) Isn't XML fun?
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And plan C works, with Google Talk, and prosody. I've successfully gotten
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push notifications flowing over XMPP!
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----
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Spent some hours dealing with an unusual probolem: git-annex started
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segfaulting intermittently on startup with the new XMPP code.
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Haskell code is not supposed to segfault..
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I think this was probably due to not using a bound thread for XMPP,
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so if haskell's runtime system recheduled its green thread onto a different
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OS thread during startup, when it's setting up TLS, it'd make gnuTLS very
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unhappy.
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So, fixed it to use a bound thread. Will wait and see if the crash is gone.
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----
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Re-enabled DBUS support, using a new version of the library that avoids the
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memory leak. Will need further changes to the library to support
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reconnecting to dbus.
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----
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Next will be a webapp configuration UI for XMPP. Various parts of the
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webapp will direct the user to set up XMPP, when appropriate, especially
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when the user sets up a cloud remote.
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To make XMPP sufficiently easy to configure, I need to check SRV records to
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find the XMPP server, which is an unexpected PITA because `getaddrinfo`
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can't do that. There are several haskell DNS libraries that I could use for
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SRV, or I could use the `host` command:
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`host -t SRV _xmpp-client._tcp.gmail.com`
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