Architecture
This section provides an in-depth explanation of the architecture of the Cylc components intended for developers and system administrators.
The main Cylc 8 system components are:
Cylc Scheduler
The workflow engine core, Python 3 based
Includes the CLI (Command Line Interface)
And TUI, a new Terminal UI application
Cylc UI
In-browser web UI, includes:
A dashboard with summary information and documentation links
Integrated gscan (multi-workflow) side-panel
Responsive web design (from desktop to table to mobile)
Tabbed interface to display multiple workflow views
Command integration for interacting with task, jobs, and schedulers
Cylc UI Server
Interacts with Schedulers and the filesystem
Serves the UI to users
Can be launched by the privileged Hub, for multi-user installations
Or run standalone for use by a single user
(The UI Server is a Jupyter Server extension)
Cylc Hub
For proving the UI in multi-user setups.
Authenticates users, spawns and proxies Cylc UI Servers
Can run as a regular or privileged user
(The Hub is a Jupyterhub instance)
Network layers
Incremental push updates (c.f. polled full-state updates in Cylc 7)