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assistant: Get back in sync with XMPP remotes after network reconnection, and on startup.

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Make manualPull send push requests over XMPP.

When reconnecting with remotes, those that are XMPP remotes cannot
immediately be pulled from and scanned, so instead maintain a set of
(probably) desynced remotes, and put XMPP remotes on it. (This set could be
used in other ways later, if we can detect we're out of sync with other
types of remotes.)

The merger handles detecting when a XMPP push is received from a desynced
remote, and triggers a scan then, if they have in fact diverged.

This has one known bug: A single XMPP remote can have multiple clients
behind it. When this happens, only the UUID of one client is recorded
as the UUID of the XMPP remote. Pushes from the other XMPP clients will not
trigger a scan. If the client whose UUID is expected responds to the push
request, it'll work, but when that client is offline, we're SOL.
This commit is contained in:
Joey Hess 2013-03-06 15:09:31 -04:00
parent dbcf26e7bc
commit c23ea9e311
7 changed files with 107 additions and 33 deletions
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doc/design/assistant/xmpp.mdwn
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@ -9,8 +9,6 @@ who share a repository, that is stored in the [[cloud]].
* Do git-annex clients sharing an account with regular clients cause confusing
things to happen?
See <http://git-annex.branchable.com/design/assistant/blog/day_114__xmpp/#comment-aaba579f92cb452caf26ac53071a6788>
* Assistant.Sync.manualPull doesn't handle XMPP remotes yet.
This is needed to handle getting back in sync after reconnection.
* Support use of a single XMPP account with several separate and
independant git-annex repos. This probably works for the simple
push notification use of XMPP, since unknown UUIDs will just be ignored.