Reba

Reba is a Service Worker subset implementation for running on server side.

Features

• Hot reconfiguration by HTTP API: Privileged Isolate to manage WorkerGroups
• Integrated cache system (?)

Plan

• Boost Beast HTTP/1.1 Web Server
• Web Fetch API
• Websocket support
• Web Crypto API
• Basic functions: setTimeout, setInterval

Design

Reba has two essential entities:

• WorkerGroup: A group of threads running the same script. It scales itself automatically based on the group's load.
• Router: A global instance storing the data needed to route an web request to an specific WorkerGroup

There is a special WorkerGroup created when Reba is started

• WorkerGroup Zero: It has a privileged context able to create new WorkerGroups and set routes.

The expected behavior of WorkerGroup Zero is:

• Connect to a control plane by Fetch API or Websocket
• Get the configured scripts and routes from the control plane
• Create the needed WorkerGroups
• Poll/wait for changes from the control plane

References

• https://github.com/w3c/ServiceWorker/blob/master/implementation_considerations.md