node-json-rrd - a pure JS [r]ound [r]obin [d]atastore library for Node.js
Simple RRD's as JSON objects.
On a linux system you can run example.js which provides a simple example of collecting and displaying traffic statistics for an interface with a COUNTER and the free/total memory using a GAUGE.
update(intervalSeconds, totalSteps, dataType, updateDataPoint[], jsonDb);
- intervalSeconds time between updates
- totalSteps total steps of data
- dataType GAUGE or COUNTER
GAUGE - values that stay within the range of defined integer types, like the value of raw materials.
COUNTER - values that count and can exceed the maximum of a defined integer type.
- updateDataPoint[] array of data points for the update, you must maintain the same order on following update()'s
- jsonDb data from previous updates
//24 hours with 5 minute interval update(5*60, 24*60/5, 'GAUGE', [34,100], jsonObject); //30 days with 1 hour interval update(60*60, 30*24, 'GAUGE', [34,100], jsonObject); //365 days with 1 day interval update(24*60*60, 365*24, 'GAUGE', [34,100], jsonObject);
The JSON Object returned by update() looks like this:
{ d: [Array],
currentStep: 19,
firstUpdateTs: 1523555609625,
r: [Array] }
d is an array which is the length you specified in totalSteps to update() that contains the data points
firstUpdateTs is a unix epoch timestamp in milliseconds of the first update in the series
r is an array which is the length you specified in totalSteps to update() that contains the rates for the data points
You can calculate the time of each update by adding the multiple of the value of intervalSeconds which you gave to update() for each time slot.
Copyright 2018 Andrew Hodel andrewhodel@gmail.com
LICENSE MIT
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