Title

Currently, OpenWhisk supports returning a JSON object only, e.g.

# wsk action invoke hello -r
{
    "greeting": "Hello stranger!"
}

It is necessary to support returning an array too as an array is also a proper JSON object, e.g.

# wsk action invoke hello-array -r
[
    "a",
    "b"
]

The sequence action should be considered support as well.

Status

• Current state: In-progress
• Author(s): @ningyougang

Summary and Motivation

This POEM proposes a new feature that allows user to write their own action which supports an array result. So actions would be able to return a JSON object or an array.

Proposed changes

Openwhisk main repo

Make controller and invoker support both a JSON object and an array result.

Runtime repos

All runtime images should support an array result. e.g.

• nodejs (supports by default)
• go
• java
• python
• php
• shell
• docker
• ruby
• dotnet
• rust
• swift
• deno
• ballerina

Openwhisk-cli repo

• The wsk CLI needs to support parsing an array result when executing actions.
• The wsk CLI needs to support parsing an array result when getting activations.