provider

Documentation

Overview

Package provider provides a factory-like abstraction for metrics backends. This package is provided specifically for the needs of the NY Times framework Gizmo. Most normal Go kit users shouldn't need to use it.

Normally, if your microservice needs to support different metrics backends, you can simply do different construction based on a flag. For example,

var latency metrics.Histogram
var requests metrics.Counter
switch *metricsBackend {
case "prometheus":
    latency = prometheus.NewSummaryVec(...)
    requests = prometheus.NewCounterVec(...)
case "statsd":
    s := statsd.New(...)
    t := time.NewTicker(5*time.Second)
    go s.SendLoop(ctx, t.C, "tcp", "statsd.local:8125")
    latency = s.NewHistogram(...)
    requests = s.NewCounter(...)
default:
    log.Fatal("unsupported metrics backend %q", *metricsBackend)
}

Index

• type Provider
  • func NewDiscardProvider() Provider
  • func NewDogstatsdProvider(d *dogstatsd.Dogstatsd, stop func()) Provider
  • func NewExpvarProvider() Provider
  • func NewGraphiteProvider(g *graphite.Graphite, stop func()) Provider
  • func NewInfluxProvider(in *influx.Influx, stop func()) Provider
  • func NewPrometheusProvider(namespace, subsystem string) Provider
  • func NewStatsdProvider(s *statsd.Statsd, stop func()) Provider

Types

type Provider

type Provider interface {
	NewCounter(name string) metrics.Counter
	NewGauge(name string) metrics.Gauge
	NewHistogram(name string, buckets int) metrics.Histogram
	Stop()
}

Provider abstracts over constructors and lifecycle management functions for each supported metrics backend. It should only be used by those who need to swap out implementations dynamically.

This is primarily useful for intermediating frameworks, and is likely unnecessary for most Go kit services. See the package-level doc comment for more typical usage instructions.

func NewDiscardProvider

func NewDiscardProvider() Provider

NewDiscardProvider returns a provider that produces no-op metrics via the discarding backend.

func NewDogstatsdProvider

func NewDogstatsdProvider(d *dogstatsd.Dogstatsd, stop func()) Provider

NewDogstatsdProvider wraps the given Dogstatsd object and stop func and returns a Provider that produces Dogstatsd metrics. A typical stop function would be ticker.Stop from the ticker passed to the SendLoop helper method.

func NewExpvarProvider

func NewExpvarProvider() Provider

NewExpvarProvider returns a Provider that produces expvar metrics.

func NewGraphiteProvider

func NewGraphiteProvider(g *graphite.Graphite, stop func()) Provider

NewGraphiteProvider wraps the given Graphite object and stop func and returns a Provider that produces Graphite metrics. A typical stop function would be ticker.Stop from the ticker passed to the SendLoop helper method.

func NewInfluxProvider

func NewInfluxProvider(in *influx.Influx, stop func()) Provider

NewInfluxProvider takes the given Influx object and stop func, and returns a Provider that produces Influx metrics.

func NewPrometheusProvider

func NewPrometheusProvider(namespace, subsystem string) Provider

NewPrometheusProvider returns a Provider that produces Prometheus metrics. Namespace and subsystem are applied to all produced metrics.

func NewStatsdProvider

func NewStatsdProvider(s *statsd.Statsd, stop func()) Provider

NewStatsdProvider wraps the given Statsd object and stop func and returns a Provider that produces Statsd metrics. A typical stop function would be ticker.Stop from the ticker passed to the SendLoop helper method.