Client

HTTP client for querying OpenTSDB.

Install

For use in Node.js,

$ npm install opentsdb-client

For use in the browser, use browserify.

Usage

To use the module,

var createClient = require( 'opentsdb-client' );

To create a new client,

var client = createClient();

A client is configurable and has the following methods...

client.host( [host] )

This method is a setter/getter. If no host is provided, the method returns the configured host. By default, the client host is 127.0.0.1. To point to a remote host,

client.host( '192.168.92.11' );

client.port( [port] )

This method is a setter/getter. If no port is provided, the method returns the configured port. By default, the client port is 4242. To set a different port,

client.port( 8080 );

client.ms( [bool] )

This method is a setter/getter. If no boolean flag is provided, the method returns the flag indicating whether time should be output at millisecond resolution. By default, millisecond resolution is on, so as to ensure timestamps are 13 digit UNIX timestamps. To turn off millisecond resolution,

client.ms( false );

client.arrays( [bool] )

This method is a setter/getter. If no boolean flag is provided, the method returns the flag indicating whether data is output as an array. By default, array output is on. To turn off array output,

client.arrays( false );

client.tsuids( [bool] )

This method is a setter/getter. If no boolean flag is provided, the method returns the flag indicating whether TSUIDs accompany data output. By default, TSUIDs are not returned. To turn on TSUID output,

client.tsuids( true );

client.annotations( [option] )

This method is a setter/getter. If no option is provided, the method returns the option indicating whether annotations should accompany data output. OpenTSDB supports two types of annotations: local and global. By default, annotations are not returned.

Three options are possible: none, local, and all. none indicates to return no annotations. local indicates to return only local annotations; i.e., annotations specific to a timeseries. all indicates to return both local and global annotations. OpenTSDB does not support returning only global annotations.

To set annotation output,

client.annotations( 'all' );

client.start( [time] )

This method is a setter/getter. If no time is provided, the method returns the configured query start time. Before making an OpenTSDB query, a start time is required. To do so,

// UNIX timestamp:
client.start( Date.now()-1000 );

// Absolute time:
client.start( '2014/10/18 09:45' );

// Relative time:
client.start( '72m-ago' );

client.end( [time | null] )

This method is a setter/getter. If no time is provided, the method returns the configured query end time. An end time is optional when making an OpenTSDB query. If no end time is set upon making a query, OpenTSDB defaults to the time at which the request is made.

// UNIX timestamp:
client.end( Date.now() );

// Absolute time:
client.end( '2014/10/18 09:47' );

// Relative time:
client.end( '70m-ago' );

If at time t1 you specify an end time and later decide at t2 to make a request which does not specify an end time, you can null the configuration value.

client.end( null );

client.queries( [query1, query2, query3,...] )

This method is a setter/getter. If no queries are provided, the method returns any previously set queries. Queries must be set before making an OpenTSDB data request.

client.queries( mQuery, mQuery, tQuery );

For more information on how to create queries, see opentsdb-mquery and opentsdb-tquery.

client.url()

Generate an OpenTSDB request URL based on a client's configuration. Both queries and a start time are required before running this method.

var url = client.url();

An example returned url:

http://127.0.0.1:4242/api/query?ms=true&arrays=true&show_tsuids=true&no_annotations=true&global_annotations=false&start=72000ms-ago&end=60s-ago&m=avg:5s-avg:cpu.utilization{nid=*}&m=avg:5s-avg:mem.utilization{nid=*}

client.get( clbk )

Make a data request from OpenTSDB. Results are passed along to the provided callback.

client.get( function onData( error, data ) {
	if ( error ) {
		console.error( JSON.stringify( error ) );
		return;
	}
	console.log( JSON.stringify( data ) );
});

client.aggregators( clbk )

Requests the current list of supported aggregation operators from OpenTSDB. Results are passed along to the provided callback.

client.aggregators( function onResponse( error, aggregators ) {
	if ( error ) {
		console.error( JSON.stringify( error ) );
		return;
	}
	console.log( JSON.stringify( aggregators ) );
});

client.metrics( clbk )

Requests the current list of stored metrics from OpenTSDB. Results are passed along to the provided callback.

client.metrics( function onResponse( error, metrics ) {
	if ( error ) {
		console.error( JSON.stringify( error ) );
		return;
	}
	console.log( JSON.stringify( metrics ) );
});

client.config( clbk )

Requests the current OpenTSDB configuration. Results are passed along to the provided callback.

client.config( function onResponse( error, config ) {
	if ( error ) {
		console.error( JSON.stringify( error ) );
		return;
	}
	console.log( JSON.stringify( config ) );
});

client.version( clbk )

Requests the current OpenTSDB version. Results are passed along to the provided callback.

client.version( function onResponse( error, version ) {
	if ( error ) {
		console.error( JSON.stringify( error ) );
		return;
	}
	console.log( JSON.stringify( version ) );
});

client.dropcaches( clbk )

Instructs an OpenTSDB to purge its in-memory caches. The response is passed along to the provided callback.

client.dropcaches( function onResponse( error, body ) {
	if ( error ) {
		console.error( JSON.stringify( error ) );
		return;
	}
	console.log( JSON.stringify( body ) );
});

Examples

var client = require( 'opentsdb-client' )(),
	mQuery = require( 'opentsdb-mquery' )(),
	end = Date.now(),
	start = end - 1000;

mQuery
	.aggregator( 'sum' )
	.downsample( '5m-avg' )
	.rate( false )
	.metric( 'mem.utilization' )
	.tags( 'nid', '1234,5678' )
	.tags( 'name', 'beep,boop' );

client
	.host( '192.168.92.111' )
	.port( 8080 )
	.ms( true )
	.arrays( true )
	.tsuids( true )
	.annotations( 'all' )
	.start( start )
	.end( end )
	.queries( mQuery )
	.get( function onData( error, data ) {
		if ( error ) {
			console.error( JSON.stringify( error ) );
			return;
		}
		console.log( JSON.stringify( data ) );
	});

To run the example code from the top-level application directory,

$ node ./examples/index.js

NOTE: before running the example, tailor the client configuration to your OpenTSDB endpoint; e.g., metric, tags, host, and port.

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

MIT license.

Copyright

Copyright © 2014. Athan Reines.