Feature request: SDK for OpenFaaS Gateway

[amlee]

My actions before raising this issue

• Followed the troubleshooting guide
• Read/searched the docs
• Searched past issues

OpenFaaS has support of CLI to invoke functions and interact with OpenFaaS gateway. But there is use case that the functions need to be invoke from a Java service application. It would be great to have an officially supported OpenFaaS Java client and API interface that can be

Expected Behaviour

This is a feature request. The OpenFaaS Java client would support the same functionalities of the OpenFaaS CLI.

Current Behaviour

Currently only CLI is supported in OpenFaaS.

Possible Solution

There is a third-party Java client implementation that appears to be generated from OpenFaaS http gateway via swagger.io, but a better defined Java interface that is supported officially by OpenFaaS would be nice.

Context

We have Java application that needs to invoke OpenFaaS functions, query Function Store, etc.. similar to what openfaas-cli does that would benefit from an official OpenFaaS Java client.

[alexellis]

Related to: #1246

[alexellis]

/close: duplicate

[alexellis]

/add label: duplicate