serverless / Functions As A Service

A sample project to explore serverless aka FAAS architecture in a cloud agnostic manner

##Lambdas aka Functions

Lambdas is considered as a process capable of running business logic in response to an event. Key characteristics are

Finite
- not always running rather starts on demand and completes with in a span of time (minutes).
Stateless & share nothing across executions
- can not maintain any state in current process. Function should depend on external process for all state requirements

Non Functional Requirements

Need a Cloud agnostic Lambda execution service. Though this is similar to AWS Lambda / Cloud functions, they can't interchangeable in terms of constraints and capability offerings.
Should run on top of Kubernetes.
We should be able to control the no. of concurrent executions of a particular type of function
- Why ? Kubernetes cluster needs to be scaled enough and no lambda can over consume resources
Ops aspects
- Monitoring (track lambda executions and results of those)
- Logging (Log should be preserved after executions)
- Developer friendly (Runnable in local env)

Building and package the function.
- For this exploration, I'm considering any docker container as a function. Programming language agnostic and at the same time removes the overhead of build and packaging
Infinite Scale

We can add more options here.