Lukas! Yep, for now, we focus on file sync and share.

Personally, I am looking into kopano or etesync to replace calendar and contacts. We already embed kopano konnectd as the OpenID provider so, there are synergies.

We do maintain backwards compatibility for the WebDAV, OCS and OCM apis and the clients are all working. The inner hook system of oc 10 obviously is gone, just as well as the internal PHP APIs. Instead we now rely on the CS3 APIs that describe a set of services in a microservice architecture to extend or customize functionality. Something that has always been fragile, because a bug in an oc/nc app could affect all other services.

Furthermore, we did not have to start from scratch but contributed to reva, which has been powering CernBox for a few years. It is the reference implementation for the CS3 api.

So, we are very much Protocol driven, which makes changing the implementation language possible if needed. And everyone is free to implement his own service replacement if he needs to. The extensive acceptance testsuite will tell you what is not working compared to oc 10 or ocis. For now, we are pretty happy with go and the initial benchmarks.

One more thing regarding core developers having moved from oc to nc. The server is just one piece of the puzzle. None, literally, none of the desktop, iOS or Android developers paid by ownCloud moved to the fork. It feels as if they were not even considered important. The sync protocol and the end user experience on his daily driver really is what matters. I am very happy that we as ownCloud finally grabbed the chance to really tackle the file sync and share part with the right tools for the job. Without being pulled in a gazillion of directions. I cannot express my gratitude for the rest of the oc sales and support team that keeps oc 10 well running and bought us the time to actually make this step. Truly exciting times

Keep in mind this is still tech preview. There is still a lot of work to do. Helping hands welcome. And yes we need to work on our communication skills...

Full disclosure: oc employee no 7 and ocis tech lead here. Originally hired to work on full text search in ownCloud 10. Good old times. Cheers to all the oc and nc devs: it should be possible to implement the internal PHP API of oc/nc using roadrunner. That might allow existing PHP apps to be wrapped in a dedicated microservice. But that is not something we are investing time in. Feel free to ping me on https://talk.owncloud.com

Are you looking into leveraging Syncthing for filesync? I always had the experience that, even recently, it was more reliable and faster. Its also written in Go.

No, but thx for the pointer. AFAICT the difference in the sync protocol is a block (syncthing) vs file based (owncloud) protocol. There are several reasons why we prefer the file based protocol.

Currently, all our clients sync using webdav. Changing the protocol would require rewriting that part of every client.

Another reason is that ownCloud as well as ocis are used to access files that resides in other existing storages, eg. S3 or CEPH. Translating those protocols to a file based sync is a lot easier than adapting syncthing (just my gut feeling).

Another aspect is that the file based sync is also state based. We can use the etag to detect changes and immediately start syncing in a breadth first approach. We are not doing that, yet. But the windows cloud vfs we implemented for the desktop clients makes this one of the next steps.

The sync in ownCloud feels slow because the clients are polling. There is currently no persistent connection that the server could use to push changes. But to be honest we have been bitten by firewalls between server and client so often that I doubt we can do real push notifications. Which is why I personally am aiming for long polling. For mobile devices we have to rely on the existing notification infrastructure from Google and apple anyway. Anyway, there are ways to speed up sync. Which switching to go made a lot more implementable. But one step after another.

We already implemented TUS for uploading files in ocis and all clients. It is a well designed extendable upload protocol that covers a lot of corner cases we have experienced first hand with all our clients. We contributed our experiences and are planning a batch extension that we would use to group lots of small files in a single upload. Delta sync should be a TUS extension as well, IMO. But that is mostly in my head.

First, we want to get the basic file sync and share features fully implemented.

So ... Yeah ... Changing the language and the architecture kind of made a knot disappear and we are moving forward.

In that regard, I personally have an eye on the Microsoft graph api which we could use for file management. Input welcome.