opentsdb-mquery
v0.0.1
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OpenTSDB metric query generator.
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Metric Query
OpenTSDB metric query factory.
OpenTSDB permits two query types: metric and tsuid.
Metric queries are general queries which return an indeterministic number of timeseries. OpenTSDB implements metric queries by searching for timeseries matching the metric criteria, e.g., metric name
and tag
.
TSUID queries request a specific timeseries having a unique id. Every timeseries has an assigned unique identifier, which is based on metric name
and any tags
.
This module provides a metric query generator.
Install
For use in Node.js,
$ npm install opentsdb-mquery
For use in the browser, use browserify.
Usage
To use the module,
var createQuery = require( 'opentsdb-mquery' );
To create a new metric query,
var mQuery = createQuery();
A metric query is configurable and has the following methods...
mQuery.aggregator( [aggregator] )
This method is a setter/getter. If no aggregator
is provided, returns the query aggregator. The default aggregator is avg
. To set a different aggregator
,
mQuery.aggregator( 'min' );
mQuery.downsample( [downsample] )
This method is a setter/getter. If no downsample
function is provided, returns the configured downsample
function. By default, downsampling is turned off (i.e., set to null
). To specify a downsample
function,
mQuery.downsample( '5s-avg' );
mQuery.rate( [bool] )
This method is a setter/getter. If no boolean flag is provided, returns the flag indicating whether to return the difference between consecutive data values. By default, the flag is false
. To turn on difference calculation,
mQuery.rate( true );
Note that rate calculation requires a set of three options.
mQuery.rateOptions( [object] )
This method is a setter/getter. If no configuration object is provided, returns the rate options: counter
, counterMax
, resetValue
. counter
must be a boolean; counterMax
must be numeric or null
; and resetValue
must be numeric.
By default,
var rateOptions = {
"counter": false,
"counterMax": null,
"resetValue": 0
};
mQuery.tags( [tag, [value]] )
This method is a setter/getter. If no arguments are provided, returns all tag names and their values. If a tag
name is specified, returns the value for that tag. Otherwise, sets a tag
to the specified value
.
mQuery.tags( 'nid', '*' );
The *
(wildcard) indicates all values for a tag
.
mQuery.dtag( tag )
This method deletes a query tag
.
// Add a tag:
mQuery.tags( 'nid', '*' );
// Delete the tag:
mQuery.dtag( 'nid' );
mQuery.metric( [name] )
This method is a setter/getter. If no metric name
is provided, returns the query metric name
. A metric name
is required to encode a metric query. To set a metric name
,
mQuery.metric( 'mem.utilization' );
Examples
var createQuery = require( 'opentsdb-mquery' );
var mQuery = createQuery();
mQuery
.aggregator( 'sum' )
.downsample( '5m-avg' )
.rate( false )
.metric( 'mem.utilization' )
.tags( 'nid', '1234,5678' )
.tags( 'name', 'beep,boop' );
To run the example code from the top-level application directory,
$ node ./examples/index.js
Tests
Unit
Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:
$ make test
All new feature development should have corresponding unit tests to validate correct functionality.
Test Coverage
This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:
$ make test-cov
Istanbul creates a ./reports/coverage
directory. To access an HTML version of the report,
$ make view-cov
License
Copyright
Copyright © 2014. Athan Reines.