oCIS - ownCloud Infinite Scale
Welcome to oCIS, the modern file-sync and share platform, which is based on our knowledge and experience with the PHP based ownCloud server.
The oCIS runtime allows us to dynamically manage services running in a single process. We use suture to create a supervisor tree that starts each service in a dedicated goroutine. By default oCIS will start all built-in oCIS extensions in a single process. Individual services can be moved to other nodes to scale-out and meet specific performance requirements. A go-micro based registry allows services in multiple nodes to form a distributed microservice architecture.
Every oCIS extension uses ocis-pkg, which implements the go-micro interfaces for servers to register and clients to lookup nodes with a service registry. We are following the 12 Factor methodology with oCIS. The uniformity of services also allows us to use the same command, logging and configuration mechanism. Configurations are forwarded from the oCIS runtime to the individual extensions.
While the go-micro framework provides abstractions as well as implementations for the different components in a microservice architecture, it uses a more developer focused runtime philosophy: It is used to download services from a repo, compile them on the fly and start them as individual processes. For oCIS we decided to use a more admin friendly runtime: You can download a single binary and start the contained oCIS extensions with a single
bin/ocis server. This also makes packaging easier.
A lot of embedded services in oCIS are built upon the REVA runtime. We decided to bundle some of the CS3 services to logically group them. A home storage provider, which is dealing with metadata, and the corresponding data provider, which is dealing with up and download, are one example. The frontend with the oc flavoured webdav, ocs handlers and a datagateway are another.
Interacting with oCIS involves a multitude af APIs. The server and all clients rely on OpenID Connect for authentication. The embedded konnectd can be replaced with any other OpenID Connect Identity Provider. Clients use the WebDAV based oc sync protocol to manage files and folders, ocs to manage shares and TUS to upload files in a resumable way. On the server side REVA is the reference implementation of the CS3 apis which is defined using protobuf. By embedding glauth, oCIS provides a read-only LDAP interface to make accounts, including guests available to firewalls and other systems. In the future, we are looking into the Microsoft Graph API, which is based on odata, as a well defined REST/JSON dialect for the existing endpoints.
bin/ocis server will start the below services, all of which can be scaled and deployed on a single node or in a cloud native environment, as needed.