node-red-context-configservice

Spring Cloud Config provides server-side for externalized configuration in a distributed system. You have a central place to manage external properties for applications across all environments.

Node-RED provides a way to store information that can be shared between different nodes without using the messages that pass through a flow. This is called context.

The scope of a particular context value determines who it is shared with. There are three context scope levels:

• Node - only visible to the node that set the value
• Flow - visible to all nodes on the same flow (or tab in the editor)
• Global - visible to all nodes

We are looking for use both features, to retrieve and storage externalized configuration in our Node-RED Global context.

Context Store with ConfigService

Node-RED provides two built-in modules for this:

• memory
• localfilesystem

We build a custom one based on the memory one.

To enable it, the following option in your Node-RED settings.js file can be used:

contextStorage: {
    default: {
        module: config => (require("@doing-things-with-node-red/node-red-context-configservice")(
            "http://configservice:80/properties.json",
            {
                strictSSL: true,
                interval: 3600000,
                retries: 3
            }
        ))
    }
},

Compose

We are using Docker Compose to test our e2e