statsd

package
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Published: Jul 13, 2016 License: MIT Imports: 11 Imported by: 0

Documentation

Overview

Package statsd implements a statsd backend for package metrics.

The current implementation ignores fields. In the future, it would be good to have an implementation that accepted a set of predeclared field names at construction time, and used field values to produce delimiter-separated bucket (key) names. That is,

c := NewFieldedCounter(..., "path", "status")
c.Add(1) // "myprefix.unknown.unknown:1|c\n"
c2 := c.With("path", "foo").With("status": "200")
c2.Add(1) // "myprefix.foo.200:1|c\n"

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func NewCallbackGauge

func NewCallbackGauge(w io.Writer, key string, reportInterval, scrapeInterval time.Duration, callback func() float64)

NewCallbackGauge emits values in the statsd protocol to the passed writer. It collects values every scrape interval from the callback. Values are buffered for the report interval or until the buffer exceeds a max packet size, whichever comes first. The report and scrape intervals may be the same. The callback determines the value, and fields are ignored, so NewCallbackGauge returns nothing.

func NewCallbackGaugeTick

func NewCallbackGaugeTick(w io.Writer, key string, reportTicker, scrapeTicker <-chan time.Time, callback func() float64)

NewCallbackGaugeTick is the same as NewCallbackGauge, but allows the user to pass in ticker channels instead of durations to control report and scrape intervals.

func NewCounter

func NewCounter(w io.Writer, key string, reportInterval time.Duration) metrics.Counter

NewCounter returns a Counter that emits observations in the statsd protocol to the passed writer. Observations are buffered for the report interval or until the buffer exceeds a max packet size, whichever comes first. Fields are ignored.

TODO: support for sampling.

func NewCounterTick

func NewCounterTick(w io.Writer, key string, reportTicker <-chan time.Time) metrics.Counter

NewCounterTick is the same as NewCounter, but allows the user to pass in a ticker channel instead of invoking time.Tick.

func NewGauge

func NewGauge(w io.Writer, key string, reportInterval time.Duration) metrics.Gauge

NewGauge returns a Gauge that emits values in the statsd protocol to the passed writer. Values are buffered for the report interval or until the buffer exceeds a max packet size, whichever comes first. Fields are ignored.

TODO: support for sampling.

func NewGaugeTick

func NewGaugeTick(w io.Writer, key string, reportTicker <-chan time.Time) metrics.Gauge

NewGaugeTick is the same as NewGauge, but allows the user to pass in a ticker channel instead of invoking time.Tick.

func NewHistogram

func NewHistogram(w io.Writer, key string, reportInterval time.Duration) metrics.Histogram

NewHistogram returns a Histogram that emits observations in the statsd protocol to the passed writer. Observations are buffered for the reporting interval or until the buffer exceeds a max packet size, whichever comes first. Fields are ignored.

NewHistogram is mapped to a statsd Timing, so observations should represent milliseconds. If you observe in units of nanoseconds, you can make the translation with a ScaledHistogram:

NewScaledHistogram(statsdHistogram, time.Millisecond)

You can also enforce the constraint in a typesafe way with a millisecond TimeHistogram:

NewTimeHistogram(statsdHistogram, time.Millisecond)

TODO: support for sampling.

func NewHistogramTick

func NewHistogramTick(w io.Writer, key string, reportTicker <-chan time.Time) metrics.Histogram

NewHistogramTick is the same as NewHistogram, but allows the user to pass a ticker channel instead of invoking time.Tick.

Types

type Emitter

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

Emitter is a struct to manage connections and orchestrate the emission of metrics to a Statsd process.

func NewEmitter

func NewEmitter(network, address string, metricsPrefix string, flushInterval time.Duration, logger log.Logger) *Emitter

NewEmitter will return an Emitter that will prefix all metrics names with the given prefix. Once started, it will attempt to create a connection with the given network and address via `net.Dial` and periodically post metrics to the connection in the statsd protocol.

func NewEmitterDial

func NewEmitterDial(dialer conn.Dialer, network, address string, metricsPrefix string, flushInterval time.Duration, logger log.Logger) *Emitter

NewEmitterDial is the same as NewEmitter, but allows you to specify your own Dialer function. This is primarily useful for tests.

func (*Emitter) Flush

func (e *Emitter) Flush(buf *bytes.Buffer)

Flush will write the given buffer to a connection provided by the Emitter's connection manager.

func (*Emitter) NewCounter

func (e *Emitter) NewCounter(key string) metrics.Counter

NewCounter returns a Counter that emits observations in the statsd protocol via the Emitter's connection manager. Observations are buffered for the report interval or until the buffer exceeds a max packet size, whichever comes first. Fields are ignored.

func (*Emitter) NewGauge

func (e *Emitter) NewGauge(key string) metrics.Gauge

NewGauge returns a Gauge that emits values in the statsd protocol via the the Emitter's connection manager. Values are buffered for the report interval or until the buffer exceeds a max packet size, whichever comes first. Fields are ignored.

TODO: support for sampling

func (*Emitter) NewHistogram

func (e *Emitter) NewHistogram(key string) metrics.Histogram

NewHistogram returns a Histogram that emits observations in the statsd protocol via the Emitter's connection manager. Observations are buffered for the reporting interval or until the buffer exceeds a max packet size, whichever comes first. Fields are ignored.

NewHistogram is mapped to a statsd Timing, so observations should represent milliseconds. If you observe in units of nanoseconds, you can make the translation with a ScaledHistogram:

NewScaledHistogram(histogram, time.Millisecond)

You can also enforce the constraint in a typesafe way with a millisecond TimeHistogram:

NewTimeHistogram(histogram, time.Millisecond)

TODO: support for sampling.

func (*Emitter) Stop

func (e *Emitter) Stop()

Stop will flush the current metrics and close the active connection. Calling stop more than once is a programmer error.

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