node-red-contrib-context-consul

Consul context store for Node-RED.

Usage

Node-red contextStorage configuration needs to be added. The host, port, secure, ca, token, timeout, datacenter and consistent settings are just past through to Consul lib

contextStorage: {
	consul: {
		module: require("node-red-contrib-context-consul"),
		config: {				//see https://www.npmjs.com/package/consul#init for more info
			prefix: "mytest",		//all KV pairs are stored in path _nrcontext/[prefix]/ - see below
			host: "consul",			//IP or hostname of consul,
			port: 8500,			//listening consul port
			secure: false,			//TLS (https) secured?
			ca: {},				//TLS info -- ca (String[], optional): array of strings or Buffers of trusted certificates in PEM format
			//token: "something",		//Consul token if any to be included in all API calls
			timeout: 3000,			//API timeout in ms
			datacenter: "mydc",		//populates the dc option in all API calls
			consistent: true,		//consistency normal (false) or strong (true, default) - see Consul docs
			lock,				//EXPERIMENTAL - bool, default is no locking
			lockttl,			//(string: "") - Specifies the number of seconds (between 10s and 86400s).
			locknode,			//Specifies the name of the consul node. This must refer to a node that is already registered.
			lockdelay,			//(string: "15s") - Specifies the duration for the lock delay. This must be greater than 0.
			debug: false			//flag to enable console debug messages
		}
	}
}

When you fire up node-red up a series of checks will execute to ensure Consul is available and working as expected. If any of them fail an error is thrown and node-red will not start. The "prefix" is basically the node-red instance ID, all KV pairs will prefixed with _nrcontext/[prefix string] so multiple instances can make use of the same Consul cluster.

note - if you do not lock (still experimental) and run multiple instances using the same prefix you are asking for trouble and KV pairs may clash.

Testing

If you have docker available, run a then docker-compose up to bring up node-red with a basic consul cluster available to store context data.

More info

Check out these links for more info, Node-red Context Docs, Node-red Context API, Consul lib on NPM