Ruby client for working with Wavefront
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README.md

Wavefront Build Status Gem Version

This is a ruby gem for speaking to the Wavefront monitoring and graphing system.

Usage

To build API documentation with YARD run

$ rake yard
...
$ cd doc
$ yard server

and documentation will be available at http://localhost:8808.

Within your own ruby code:

Writer

The Wavefront::Writer class can be used to post metrics to Wavefront.

Example usage:

require 'wavefront/writer'
tags = {'k1' => 'v1', 'k2' => 'value 2'}
writer = Wavefront::Writer.new({:agent_host => 'agent.local.com', :host_name => 'server1', :metric_name => 'namespace.my.metric', :point_tags => tags})
# value of the metric at current timestamp is: 5
writer.write(5)
# Let's write a different metric overwriting the default options from the constructor
writer.write(6, 'namespace.my.other.metric', {host_name: 'server2'})
  • The initializer takes a hash of options, wherein one can set
    • :agent_host - A String representing the hostname of the Wavefront Agent. Default: localhost
    • :agent_port - A number representing the port of the Wavefront Agent. Default: 2878
    • :host_name - A String representing the host that reported metrics will appear to be from in Wavefront. Default: The fqdn of the machine where your Ruby code is running. Can be over-written by the write method
    • :metric_name - A String representing the default metric name for any metrics reported from this class. Default: None. Can be over-written by the write method
    • point_tags - A Map of key, value pairs of strings which will be sent to Wavefront. Can be over-written by the write method
    • The write method parameters are:
      • metric_value - A number, the value of the metric reporting at the current timestamp
      • metric_name - A String, this must be present, either within the write method call or set on the Writer class
      • A hash of options:
        • host_name - A String, which will appear as the host for the sent metric in Wavefront. Defaults to the host_name used to initialize the class.
        • point_tags - A Map of key, value pairs of strings which will be sent to Wavefront. Not required. Note that if you specify these as part of the write method call they replace any set at the class level. The two maps are not merged. Defaults to the point_tags used to initialize the class
        • timestamp - The Epoch Seconds (Fixnum), or a Ruby Time object, of the reported point Default: Time.now

Host Tags

The Wavefront::Metadata class facilitates the retrieval and posting of host tag related data to and from Wavefront.

Example usage:

require 'wavefront/metadata'
meta = Wavefront::Metadata.new('<TOKEN>')

meta.get_tags # Get tags for all hosts
meta.get_tags("webserver.hostname.com") # Get tags for a specific host
meta.add_tags(["host.server1.server.com","host.server2.server.com"],["tag1","tag2"]) # Add an arbitrary number of tags to an arbitrary number of hosts
meta.remove_tags(["server1.server.com","server2.server.com"],["tag1","tag2"]) # Remove an arbitrary number of tags from an arbitrary number of hosts
  • The initializer takes up to 3 parameters:
    • token - A valid Wavefront API Token. This is required.
    • host - A String representing the Wavefront endpoint to connect to. Default: metrics.wavefront.com.
    • debug true|false - When set to true output RestClient debugging to stdout. Default: false.

Query Client

The Wavefront::Client class can be used to send queries to Wavefront and get a response

Example usage:

require 'wavefront/client'

TOKEN ='123TOKEN'
wave = Wavefront::Client.new(TOKEN)
response = wave.query('<TS_EXPRESSION>')  # <TS_EXPRESSION> : Placeholder for a valid Wavefront ts() query
response = wave.query('<TS_EXPRESSION>', 'm', {:start_time => Time.now - 86400, :end_time => Time.now})  # <TS_EXPRESSION> : Placeholder for a valid Wavefront ts() query
  • Like the Metadata class, the initializer takes up to 3 parameters:

    • token - A valid Wavefront API Token. This is required.
    • host - A String representing the Wavefront endpoint to connect to. Default: metrics.wavefront.com.
    • debug true|false - When set to true output RestClient debugging to stdout. Default: false.
  • The query method takes up to 3 parameters:

    • The first parameter is required and is any valid Wavefront TS expression
    • The second parameter is a valid granularity, these are: 'd', 'm', 'h' and 's'. Default: m
    • The third parameter is a Hash of options. These are:
      • :start_time - An object of class Time that specifies the query start time. Default: Time.now - 600.
      • :end_time - And object of class Time that specifies the query end time. Default: Time.now.
      • :response_format [ :raw, :ruby, :graphite, :highcharts ] - See the section "Response Classes" below. Default: :raw.
      • :prefix_length - Used when performing schema manipulations. See the Graphite response format below. Default 1.
      • :strict - originally Wavefront would return data points either side of the requested range. These extra points are required by the UI, but when you use the API you almost certainly don't want them. In Wavefront 2.4, an API parameter strict was introduced, which removes this padding. By default we set this to true, so you will get back exactly the range you request with :start_time and :end_time. If you wish to have the old behaviour, set this to false.
      • :includeObsoleteMetrics - With Wavefront 3.0 onwards, the non-reporting metrics are treated as obsolete after 4 weeks of no data being reported for them. Setting includeObsoleteMetrics to true allows you to pull these obsolete metrics. It defaults to false
      • :passthru - as Wavefront develops it is hard to keep pace with the API changes and cover everything in the SDK. The passthru hash lets you pass parameters directly to the Wavefront API. Thus you can set things like summarization, or listMode directly, without having to implement them explicity in the SDK. Obviously no type-checking is done to the passthru hash, so refer to the Wavefront API docs, and use it with caution.

Response Classes

The query method returns a sub-class of Wavefront::Response. By default this is Wavefront::Response::Raw, which is the raw String returned from the API. By including the :response_format key in the options hash when calling the query method you can receive responses as a number of other classes.

Example usage:

  • :response_format => :raw

Default. Raw String returned from the API.

  • :response_format => :ruby

A ruby object with accessor methods to the various parts of the query:

response = wave.query('<TS_EXPRESSION>', 'm')  # <TS_EXPRESSION> : Placeholder for a valid Wavefront ts() query
response.class  # Wavefront::Response::Raw
response = wave.query('<TS_EXPRESSION>', 'm', {:response_format => :ruby}) # <TS_EXPRESSION> : Placeholder for a valid Wavefront ts() query
response.class # Wavefront::Response::Ruby
response.instance_variables  # [:@response, :@query, :@name, :@timeseries, :@stats]
response.query
  • :response_format => :graphite

A ruby object that returns graphite-format data via the graphite method:

response = wave.query('<TS_EXPRESSION>', 'm', {:response_format => :graphite}) # <TS_EXPRESSION> : Placeholder for a valid Wavefront ts() query
response.graphite[0]['datapoints'].first  # [99.8, 1403702640]

Note: The target schema String is constructed from the label and the host portions of the raw Wavefront response in order to be idiomatically Graphite. In order to determine how to do this properly one must split the label into a prefix and a postfix, inserting the host between then.

For example, label: "web.prod.base.host.cpu-0.percent-idle" and host: i-12345678, by default, would yield: web.i-12345678.prod.base.host.cpu-0.percent-idle as the Graphite target.

Depending on the vagaries of your particular configuration you may wish to specify more than the default 1 field as a prefix. This can be achieved passing the :prefix_length key as an option with an appropriate Fixnum. For example:

response = wave.query('<TS_EXPRESSION>', 'm', {:response_format => :graphite, :prefix_length => 2})
response.graphite[0]['target'] # web.prod.i-12345678.base.host.cpu-0.percent-idle
  • :response_format => :highcharts

A ruby object that returns highcharts-format data via the response method:

response = wave.query('<TS_EXPRESSION>', 'm', {:response_format => :highcharts}) # <TS_EXPRESSION> : Placeholder for a valid Wavefront ts() query
response.highcharts[0]['data'].first  # [1436849460000, 517160277.3333333]

Command-line client

A command line client is included too. Please see README-cli.md for details.

Building and installing

rake build

or

rake install

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Credits

Many thanks to SpaceApe games for initially contributing this Ruby client. Contributors include:

Sam Pointer Louis McCormack Joshua McGhee Robert Fisher Salil Deshmukh Conor Beverland