Implement WebDAV sync (RFC 6578)

[untitaker]

http://www.ietf.org/rfc/rfc6578.txt

Helps avoiding fetching the whole list of items. Should be implemented with fallback to a normal query of all items, because server support is uncertain.

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[geier]

supposedly, most servers support this now

[untitaker]

If anybody actually needs this much performance, they're welcomed to work on it. I haven't thought about this much, but:

• I think it's obvious that this feature should be somehow exposed through the storage class.
• The sync algorithm can reuse the list from the status if nothing changed.

[untitaker]

Also, this seems to be very related to #34, to the point where it might not make sense to implement both ctags and webdav-sync.

[untitaker]

Neither ownCloud nor Baikal announce it as a capability, and Radicale certainly doesn't support this.

I'm not sure where the estimate "most servers" comes from.

[geier]

@untitaker I never checked this, I only repeated what I read. The only thing I could find, is that according to its wikipedia page SabreDAV supports it.

Edit: davical also claims compatibility

[untitaker]

Hmm, it doesn't seem sync support has to be announced at all. Will check again.

[untitaker]

Alright, when I use CalDAV-Sync by dmfs, I get 404 when the app tries to fetch the sync-token prop using a PROPFIND/propstat. Both ownCloud (latest version) and Baikal (0.2.7)

[untitaker]

I suppose that not every server that uses SabreDAV automatically supports it since it requires support from whichever storage backend/layout the server uses.

[geier]

If you are interested in testing against davical but don't want to set
it up, I'm happy to make you an account on my instance.

Quoting Markus Unterwaditzer (2015-12-18 13:56:16)

I suppose that not every server that uses SabreDAV automatically supports it since it requires support from whichever storage backend/layout the server uses.

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[untitaker]

Thanks for the offer. I'd be interested in integrating Davical into the Travis
config. Is this also an option?

On Fri, Dec 18, 2015 at 05:08:09AM -0800, Christian Geier wrote:

If you are interested in testing against davical but don't want to set
it up, I'm happy to make you an account on my instance.

Quoting Markus Unterwaditzer (2015-12-18 13:56:16)

I suppose that not every server that uses SabreDAV automatically supports it since it requires support from whichever storage backend/layout the server uses.

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Reply to this email directly or view it on GitHub:
#26 (comment)

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[geier]

Quoting Markus Unterwaditzer (2015-12-18 14:17:34)

Thanks for the offer. I'd be interested in integrating Davical into the Travis
config. Is this also an option?

Sure. The caveat is that I run it at home over a DSL connection which
gets reconnected once a day, but other than that, I don't have a problem
with it.

On Fri, Dec 18, 2015 at 05:08:09AM -0800, Christian Geier wrote:

If you are interested in testing against davical but don't want to set
it up, I'm happy to make you an account on my instance.

Quoting Markus Unterwaditzer (2015-12-18 13:56:16)

I suppose that not every server that uses SabreDAV automatically supports it since it requires support from whichever storage backend/layout the server uses.

---

Reply to this email directly or view it on GitHub:
#26 (comment)

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Reply to this email directly or view it on GitHub:
#26 (comment)

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Reply to this email directly or view it on GitHub:
#26 (comment)

[untitaker]

Not sure how unstable connections would affect this, in the worst case I'd have to kick over the build a lot.

what I'm more worried about is that the testsuite would probably hammer your server. If you send me the credentials I could set up a testrun in Travis so you can observe.

On 18 December 2015 14:30:25 CET, Christian Geier notifications@github.com wrote:

Quoting Markus Unterwaditzer (2015-12-18 14:17:34)

Thanks for the offer. I'd be interested in integrating Davical into
the Travis
config. Is this also an option?

Sure. The caveat is that I run it at home over a DSL connection which
gets reconnected once a day, but other than that, I don't have a
problem
with it.

On Fri, Dec 18, 2015 at 05:08:09AM -0800, Christian Geier wrote:

If you are interested in testing against davical but don't want to
set
it up, I'm happy to make you an account on my instance.

Quoting Markus Unterwaditzer (2015-12-18 13:56:16)

I suppose that not every server that uses SabreDAV automatically
supports it since it requires support from whichever storage
backend/layout the server uses.

---

Reply to this email directly or view it on GitHub:

#26 (comment)

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Reply to this email directly or view it on GitHub:

#26 (comment)

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Reply to this email directly or view it on GitHub:

#26 (comment)

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Sent from my phone. Please excuse my brevity.

[untitaker]

(See #308)