rrdcached-binding

This is a Node.js lib for binding to RRDrool's rrdcached using node's net API.

Usage

You can connect to both UNIX and TCP sockets. Sockets should have a unix: prefix followed by a path. For TCP connections, an IP address and port must be supplied.

Most commands the daemon understands are encapsulated as own functions. Nevertheless, any command can be sent as a string. You'll get an Object back as a result:

{ statuscode: 4,
  status: 'Help for FLUSHALL',
  error: false,
  info:
   [ 'Usage: FLUSHALL',
     '',
     'Triggers writing of all pending updates.  Returns immediately.' ] }

The most important attributes will be error, which indicates if the command completed normally, and the info array, which contains the actual result of the command. See PROTOCOL section for details about statuscode etc. and Valid Commands for a list of commands.

Installation

rrdcached-binding is available via npmjs: https://www.npmjs.com/package/rrdcached-binding

npm install rrdcached-binding

Connecting

RRD = require('./rrdcached');
RRD.connect('unix:/tmp/rrdcached.sock', function(err){
	console.log('connected');
});

OR

RRD = require('./rrdcached');
RRD.connect('192.168.0.200:42217', function(err){
	console.log('connected');
});

Commands

Supported commands are:

• RRD.update(filename, values, callback)

  • values can be a single String or an Array of String

• RRD.fetch(filename, consFunction, options, callback)

• RRD.flush(filename, callback)

• RRD.flushall(callback)

• RRD.help(command, callback)

• RRD.pending(filename, callback)

• RRD.forget(filename, callback)

• RRD.queue(callback)

  • In addition to the info-array, there is a parsed queue Object with file -> number of values to be written for the file

• RRD.stats(callback)

  • In addition to the info-array, there is a parsed assiciative stats Object with the different stats

• RRD.ping(callback)

• RRD.first(filename, rranum, callback)

  • rranum is optional

• RRD.last(filename, callback)

• RRD.info(filename, callback)

• RRD.create(filename, options, DSDefinitions, RRADefinitions, callback)

• RRD.batch(commands, callback)

  • commands is currently an Array of String consisting of custom commands (see below)

• RRD.quit(callback)

Note that callback is of the form function(err, reply)!

Sending custom commands

RRD.write('HELP FLUSHALL', function(err, reply){
	if(err){
		console.log("Error: " + err);
		return;
	}
	console.log(reply);
	console.log('exiting');
	process.exit(0);
});

TODO

• FETCH command
• FETCHBIN command

Known issues