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Overview

WIP. The eigr.io documentation is a work-in-progress right now.

Abstract​

Serverless runtimes are often hidden in a cloud providers offering and exposed solely by their programming API and deployment procedures. eigr.io is an open-source serverless runtime built for the cloud and on-premises, running on the BEAM with a polyglot programming model to build general purpose applications.

Key Points​

  • The eigr/functions project is no fork of Cloudstate but based on a new implementation of the Cloudstate protocol.
  • The technical basis for project eigr is Erlang/OTP and the BEAM-VM.
  • Developer Libraries are intended to be compatible with Cloudstate and Akka Serverless.

Function as a Service (FaaS)​

FaaS
╔═══════════════╗    ╔═══════════════════╗    ╔═══════════════╗
║               ║    ║                   ║    ║               ║
║  Message In   ║───▶║      Service      ║───▶║  Message Out  ║
║               ║    ║                   ║    ║               ║
╚═══════════════╝    ╚═══════════════════╝    ╚═══════════════╝

"message in, message out" – Bonér, 2020, "CloudState—Towards Stateful Serverless"

Stateful Services​

State is brought to the incoming message right at the time the message passed to the service and even before the service handles that message. This is possible by state-models that are abstracted in a way so that state can be lifted to a context available to a service that has chosen the very state-model.

Stateful FaaS
╔═══════════════╗                             ╔═══════════════╗
║               ║─┐                        ┌─▶║               ║
║  Message In   ║ │  ╔═══════════════════╗ │  ║  Message Out  ║
║               ║ └─▶║                   ║─┘  ║               ║
╚═══════════════╝    ║      Service      ║    ╚═══════════════╝
╔═══════════════╗ ┌─▶║                   ║─┐  ╔═══════════════╗
║               ║ │  ╚═══════════════════╝ │  ║               ║
║   State In    ║─┘                        └─▶║   State Out   ║
║               ║                             ║               ║
╚═══════════════╝                             ╚═══════════════╝