statsd

package module
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 Go to latest Published: Nov 28, 2017 License: MIT Imports: 8 Imported by: 0

README

statsd

Build Status Code Coverage Documentation

Introduction

statsd is a simple and efficient Statsd client.

Features

  • Supports all StatsD metrics: counter, gauge, timing and set
  • Supports InfluxDB and Datadog tags
  • Fast and GC-friendly: all functions for sending metrics do not allocate
  • Efficient: metrics are buffered by default
  • Simple and clean API
  • 100% test coverage
  • Versioned API using gopkg.in

Documentation

https://godoc.org/gopkg.in/johnrichter/statsd.v2

Download

go get gopkg.in/johnrichter/statsd.v2

Example

See the examples in the documentation.

License

MIT

Contribute

Do you have any question the documentation does not answer? Is there a use case that you feel is common and is not well-addressed by the current API?

If so you are more than welcome to ask questions, open an issue, or send a pull-request here on Github.

Documentation

Overview

Package statsd is a simple and efficient StatsD client.

Options

Use options to configure the Client: target host/port, sampling rate, tags, etc.

Whenever you want to use different options (e.g. other tags, different sampling rate), you should use the Clone() method of the Client.

Because when cloning a Client, the same connection is reused so this is way cheaper and more efficient than creating another Client using New().

Internals

Client's methods buffer metrics. The buffer is flushed when either:

  • the background goroutine flushes the buffer (every 100ms by default)
  • the buffer is full (1440 bytes by default so that IP packets are not fragmented)

The background goroutine can be disabled using the FlushPeriod(0) option.

Buffering can be disabled using the MaxPacketSize(0) option.

StatsD homepage: https://github.com/etsy/statsd

Example 
package main

import (
	"log"
	"runtime"

	"github.com/johnrichter/statsd"
)

func ping(url string) {}

func main() {
	c, err := statsd.New() // Connect to the UDP port 8125 by default.
	if err != nil {
		// If nothing is listening on the target port, an error is returned and
		// the returned client does nothing but is still usable. So we can
		// just log the error and go on.
		log.Print(err)
	}
	defer c.Close()

	// Increment a counter.
	c.Increment("foo.counter")

	// Gauge something.
	c.Gauge("num_goroutine", runtime.NumGoroutine())

	// Time something.
	t := c.NewTiming()
	ping("http://example.com/")
	t.Send("homepage.response_time")

	// It can also be used as a one-liner to easily time a function.
	pingHomepage := func() {
		defer c.NewTiming().Send("homepage.response_time")

		ping("http://example.com/")
	}
	pingHomepage()

	// Cloning a Client allows using different parameters while still using the
	// same connection.
	// This is way cheaper and more efficient than using New().
	stat := c.Clone(statsd.Prefix("http"), statsd.SampleRate(0.2))
	stat.Increment("view") // Increments http.view
}

Output:

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Client 

type Client struct {
	// contains filtered or unexported fields
}

A Client represents a StatsD client.

func New 

func New(opts ...Option) (*Client, error)

New returns a new Client.

func (*Client) Clone 

func (c *Client) Clone(opts ...Option) *Client

Clone returns a clone of the Client. The cloned Client inherits its configuration from its parent.

All cloned Clients share the same connection, so cloning a Client is a cheap operation.

Example 
package main

import (
	"log"

	"github.com/johnrichter/statsd"
)

func main() {
	c, err := statsd.New(statsd.Prefix("my_app"))
	if err != nil {
		log.Print(err)
	}

	httpStats := c.Clone(statsd.Prefix("http"))
	httpStats.Increment("foo.bar") // Increments: my_app.http.foo.bar
}

Output:

func (*Client) Close 

func (c *Client) Close()

Close flushes the Client's buffer and releases the associated ressources. The Client and all the cloned Clients must not be used afterward.

func (*Client) Count 

func (c *Client) Count(bucket string, n interface{})

Count adds n to bucket.

func (*Client) Flush 

func (c *Client) Flush()

Flush flushes the Client's buffer.

func (*Client) Gauge 

func (c *Client) Gauge(bucket string, value interface{})

Gauge records an absolute value for the given bucket.

func (*Client) GaugeDelta 

func (c *Client) GaugeDelta(bucket string, value interface{})

GaugeDelta records an offset value for the given bucket

func (*Client) Histogram 

func (c *Client) Histogram(bucket string, value interface{})

Histogram sends an histogram value to a bucket.

func (*Client) Increment 

func (c *Client) Increment(bucket string)

Increment increment the given bucket. It is equivalent to Count(bucket, 1).

func (*Client) NewTiming 

func (c *Client) NewTiming() Timing

NewTiming creates a new Timing.

Example 
package main

import (
	"github.com/johnrichter/statsd"
)

var c *statsd.Client

func ping(url string) {}

func main() {
	// Send a timing metric each time the function is run.
	defer c.NewTiming().Send("homepage.response_time")
	ping("http://example.com/")
}

Output:

func (*Client) Timing 

func (c *Client) Timing(bucket string, value interface{})

Timing sends a timing value to a bucket.

func (*Client) Unique 

func (c *Client) Unique(bucket string, value string)

Unique sends the given value to a set bucket.

type Option 

type Option func(*config)

An Option represents an option for a Client. It must be used as an argument to New() or Client.Clone().

func Address 

func Address(addr string) Option

Address sets the address of the StatsD daemon.

By default, ":8125" is used. This option is ignored in Client.Clone().

Example 
package main

import (
	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	c, err = statsd.New(statsd.Address("192.168.0.5:8126"))
}

Output:

func ErrorHandler 

func ErrorHandler(h func(error)) Option

ErrorHandler sets the function called when an error happens when sending metrics (e.g. the StatsD daemon is not listening anymore).

By default, these errors are ignored. This option is ignored in Client.Clone().

Example 
package main

import (
	"log"

	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	c, err = statsd.New(statsd.ErrorHandler(func(err error) {
		log.Print(err)
	}))
}

Output:

func FlushPeriod 

func FlushPeriod(p time.Duration) Option

FlushPeriod sets how often the Client's buffer is flushed. If p is 0, the goroutine that periodically flush the buffer is not lauched and the buffer is only flushed when it is full.

By default, the flush period is 100 ms. This option is ignored in Client.Clone().

Example 
package main

import (
	"time"

	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	c, err = statsd.New(statsd.FlushPeriod(10 * time.Millisecond))
}

Output:

func MaxPacketSize 

func MaxPacketSize(n int) Option

MaxPacketSize sets the maximum packet size in bytes sent by the Client.

By default, it is 1440 to avoid IP fragmentation. This option is ignored in Client.Clone().

Example 
package main

import (
	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	c, err = statsd.New(statsd.MaxPacketSize(512))
}

Output:

func Mute 

func Mute(b bool) Option

Mute sets whether the Client is muted. All methods of a muted Client do nothing and return immedialtly.

This option can be used in Client.Clone() only if the parent Client is not muted. The clones of a muted Client are always muted.

Example 
package main

import (
	"log"

	"github.com/johnrichter/statsd"
)

func main() {
	c, err := statsd.New(statsd.Mute(true))
	if err != nil {
		log.Print(err)
	}
	c.Increment("foo.bar") // Does nothing.
}

Output:

func Network 

func Network(network string) Option

Network sets the network (udp, tcp, etc) used by the client. See the net.Dial documentation (https://golang.org/pkg/net/#Dial) for the available network options.

By default, network is udp. This option is ignored in Client.Clone().

Example 
package main

import (
	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	// Send metrics using a TCP connection.
	c, err = statsd.New(statsd.Network("tcp"))
}

Output:

func Prefix 

func Prefix(p string) Option

Prefix appends the prefix that will be used in every bucket name.

Note that when used in cloned, the prefix of the parent Client is not replaced but is prepended to the given prefix.

Example 
package main

import (
	"log"

	"github.com/johnrichter/statsd"
)

func main() {
	c, err := statsd.New(statsd.Prefix("my_app"))
	if err != nil {
		log.Print(err)
	}
	c.Increment("foo.bar") // Increments: my_app.foo.bar
}

Output:

func SampleRate 

func SampleRate(rate float32) Option

SampleRate sets the sample rate of the Client. It allows sending the metrics less often which can be useful for performance intensive code paths.

Example 
package main

import (
	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	c, err = statsd.New(statsd.SampleRate(0.2)) // Send metrics 20% of the time.
}

Output:

func Tags 

func Tags(tags ...string) Option

Tags appends the given tags to the tags sent with every metrics. If a tag already exists, it is replaced.

The tags must be set as key-value pairs. If the number of tags is not even, Tags panics.

If the format of tags have not been set using the TagsFormat option, the tags will be ignored.

Example 
package main

import (
	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	c, err = statsd.New(
		statsd.TagsFormat(statsd.InfluxDB),
		statsd.Tags("region", "us", "app", "my_app"),
	)
}

Output:

func TagsFormat 

func TagsFormat(tf TagFormat) Option

TagsFormat sets the format of tags.

Example 
package main

import (
	"github.com/johnrichter/statsd"
)

var (
	c   *statsd.Client
	err error
)

func main() {
	c, err = statsd.New(statsd.TagsFormat(statsd.InfluxDB))
}

Output:

type TagFormat 

type TagFormat uint8

TagFormat represents the format of tags sent by a Client. 

const (
	// InfluxDB tag format.
	// See https://influxdb.com/blog/2015/11/03/getting_started_with_influx_statsd.html
	InfluxDB TagFormat = iota + 1
	// Datadog tag format.
	// See http://docs.datadoghq.com/guides/metrics/#tags
	Datadog
)

type Timing 

type Timing struct {
	// contains filtered or unexported fields
}

A Timing is an helper object that eases sending timing values.

func (Timing) Duration 

func (t Timing) Duration() time.Duration

Duration returns the time elapsed since the creation of the Timing.

func (Timing) Send 

func (t Timing) Send(bucket string)

Send sends the time elapsed since the creation of the Timing.

Source Files

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