mirror of
https://github.com/prometheus/statsd_exporter.git
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Initial commit.
This commit is contained in:
Julius Volz
commit
14385cd831
2 changed files with 449 additions and 0 deletions
323
main.go
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323
main.go
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// Copyright (c) 2013, Prometheus Team
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// All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"flag"
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"log"
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"net"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/exp"
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)
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var listeningAddress = flag.String("listeningAddress", ":8080", "The address on which to expose generated Prometheus metrics.")
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var statsdListeningAddress = flag.String("statsdListeningAddress", ":8126", "The UDP address on which to receive statsd metric lines.")
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type CounterContainer struct {
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sync.RWMutex
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Elements map[string]prometheus.Counter
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}
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func NewCounterContainer() *CounterContainer {
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return &CounterContainer{
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Elements: make(map[string]prometheus.Counter),
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}
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}
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func (c *CounterContainer) Get(metricName string) prometheus.Counter {
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c.Lock()
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defer c.Unlock()
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counter, ok := c.Elements[metricName]
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if !ok {
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counter = prometheus.NewCounter()
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c.Elements[metricName] = counter
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prometheus.Register(metricName, "", prometheus.NilLabels, counter)
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}
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return counter
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}
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type GaugeContainer struct {
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sync.RWMutex
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Elements map[string]prometheus.Gauge
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}
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func NewGaugeContainer() *GaugeContainer {
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return &GaugeContainer{
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Elements: make(map[string]prometheus.Gauge),
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}
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}
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func (c *GaugeContainer) Get(metricName string) prometheus.Gauge {
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c.Lock()
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defer c.Unlock()
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gauge, ok := c.Elements[metricName]
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if !ok {
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gauge = prometheus.NewGauge()
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c.Elements[metricName] = gauge
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prometheus.Register(metricName, "", prometheus.NilLabels, gauge)
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}
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return gauge
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}
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type SummaryContainer struct {
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sync.RWMutex
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Elements map[string]prometheus.Histogram
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ResetInterval time.Duration
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}
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func NewSummaryContainer() *SummaryContainer {
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return &SummaryContainer{
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Elements: make(map[string]prometheus.Histogram),
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}
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}
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func (c *SummaryContainer) Get(metricName string) prometheus.Histogram {
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c.Lock()
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defer c.Unlock()
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summary, ok := c.Elements[metricName]
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if !ok {
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summary = prometheus.NewDefaultHistogram()
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c.Elements[metricName] = summary
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prometheus.Register(metricName, "", prometheus.NilLabels, summary)
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}
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return summary
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}
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type Event interface {
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MetricName() string
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Value() float64
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}
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type CounterEvent struct {
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metricName string
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value float64
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}
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func (c *CounterEvent) MetricName() string { return c.metricName }
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func (c *CounterEvent) Value() float64 { return c.value }
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type GaugeEvent struct {
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metricName string
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value float64
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}
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func (g *GaugeEvent) MetricName() string { return g.metricName }
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func (g *GaugeEvent) Value() float64 { return g.value }
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type TimerEvent struct {
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metricName string
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value float64
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}
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func (t *TimerEvent) MetricName() string { return t.metricName }
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func (t *TimerEvent) Value() float64 { return t.value }
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type Events []Event
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type Bridge struct {
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Counters *CounterContainer
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Gauges *GaugeContainer
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Summaries *SummaryContainer
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}
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func escapeMetricName(metricName string) string {
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// TODO: evaluate what kind of escaping we really want.
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metricName = strings.Replace(metricName, "_", "__", -1)
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metricName = strings.Replace(metricName, "-", "__", -1)
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metricName = strings.Replace(metricName, ".", "_", -1)
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return metricName
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}
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func (b *Bridge) Listen(e <-chan Events) {
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for {
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events := <-e
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for _, event := range events {
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metricName := escapeMetricName(event.MetricName())
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switch event.(type) {
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case *CounterEvent:
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counter := b.Counters.Get(metricName + "_counter")
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counter.IncrementBy(prometheus.NilLabels, event.Value())
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case *GaugeEvent:
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gauge := b.Gauges.Get(metricName + "_gauge")
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gauge.Set(prometheus.NilLabels, event.Value())
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case *TimerEvent:
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summary := b.Summaries.Get(metricName + "_timer")
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summary.Add(prometheus.NilLabels, event.Value())
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default:
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log.Println("Unsupported event type")
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}
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}
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}
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}
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func NewBridge() *Bridge {
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return &Bridge{
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Counters: NewCounterContainer(),
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Gauges: NewGaugeContainer(),
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Summaries: NewSummaryContainer(),
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}
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}
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type StatsDListener struct {
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conn *net.UDPConn
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}
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func (l *StatsDListener) Listen(e chan<- Events) {
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// TODO: evaluate proper size according to MTU
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var buf [512]byte
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for {
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n, _, err := l.conn.ReadFromUDP(buf[0:])
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if err != nil {
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log.Fatal(err)
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}
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l.handlePacket(buf[0:n], e)
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}
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}
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func (l *StatsDListener) handlePacket(packet []byte, e chan<- Events) {
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lines := strings.Split(string(packet), "\n")
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events := Events{}
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for _, line := range lines {
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if line == "" {
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continue
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}
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elements := strings.Split(line, ":")
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if len(elements) < 2 {
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log.Println("Bad line from StatsD:", line)
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continue
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}
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metric := elements[0]
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samples := elements[1:]
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for _, sample := range samples {
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components := strings.Split(sample, "|")
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samplingFactor := 1.0
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if len(components) < 2 || len(components) > 3 {
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log.Println("Bad component on line:", line)
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continue
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}
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valueStr, statType := components[0], components[1]
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value, err := strconv.Atoi(valueStr)
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if err != nil {
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log.Printf("Bad value %s on line: %s", valueStr, line)
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continue
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}
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if len(components) == 3 {
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if statType != "c" {
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log.Println("Illegal sampling factor for non-counter metric on line", line)
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}
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samplingStr := components[2]
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if samplingStr[0] != '@' {
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log.Printf("Invalid sampling factor %s on line %s", samplingStr, line)
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continue
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}
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samplingFactor, err = strconv.ParseFloat(samplingStr[1:], 64)
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if err != nil {
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log.Printf("Invalid sampling factor %s on line %s", samplingStr, line)
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continue
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}
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if samplingFactor == 0 {
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// This should never happen, but avoid division by zero if it does.
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log.Printf("Invalid zero sampling factor %s on line %s, setting to 1", samplingStr, line)
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samplingFactor = 1
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}
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}
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var event Event
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switch statType {
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case "c":
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event = &CounterEvent{
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metricName: metric,
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value: float64(value) / samplingFactor,
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}
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case "g":
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event = &GaugeEvent{
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metricName: metric,
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value: float64(value),
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}
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case "ms":
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event = &TimerEvent{
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metricName: metric,
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value: float64(value),
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}
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case "s":
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log.Println("No support for StatsD sets in line", line)
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default:
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log.Printf("Bad stat type %s on line: %s", statType, line)
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}
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if event != nil {
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events = append(events, event)
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}
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}
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}
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e <- events
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}
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func serveHTTP() {
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exp.Handle(prometheus.ExpositionResource, prometheus.DefaultHandler)
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http.ListenAndServe(*listeningAddress, exp.DefaultCoarseMux)
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}
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func udpAddrFromString(addr string) *net.UDPAddr {
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host, portStr, err := net.SplitHostPort(*statsdListeningAddress)
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if err != nil {
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log.Fatal("Bad StatsD listening address", *statsdListeningAddress)
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}
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if host == "" {
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host = "0.0.0.0"
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}
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ip, err := net.ResolveIPAddr("ip", host)
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if err != nil {
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log.Fatalf("Unable to resolve %s: %s", host, err)
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}
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port, err := strconv.Atoi(portStr)
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if err != nil || port < 0 || port > 65535 {
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log.Fatal("Bad port %s: %s", portStr, err)
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}
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return &net.UDPAddr{
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IP: ip.IP,
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Port: port,
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Zone: ip.Zone,
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}
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}
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func main() {
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flag.Parse()
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go serveHTTP()
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events := make(chan Events, 1024)
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defer close(events)
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listenAddr := udpAddrFromString(*statsdListeningAddress)
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conn, err := net.ListenUDP("udp", listenAddr)
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if err != nil {
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log.Fatal(err)
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}
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l := &StatsDListener{conn: conn}
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go l.Listen(events)
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bridge := NewBridge()
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bridge.Listen(events)
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}
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126
main_test.go
Normal file
126
main_test.go
Normal file
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@ -0,0 +1,126 @@
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// Copyright (c) 2013, Prometheus Team
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// All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"testing"
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)
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func TestHandlePacket(t *testing.T) {
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scenarios := []struct {
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name string
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in string
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out Events
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}{
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{
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name: "empty",
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}, {
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name: "simple counter",
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in: "foo:2|c",
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out: Events{
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&CounterEvent{
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metricName: "foo",
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value: 2,
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},
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},
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}, {
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name: "simple gauge",
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in: "foo:3|g",
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out: Events{
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&GaugeEvent{
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metricName: "foo",
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value: 3,
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},
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},
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}, {
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name: "simple timer",
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in: "foo:200|ms",
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out: Events{
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&TimerEvent{
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metricName: "foo",
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value: 200,
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},
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},
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}, {
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name: "combined multiline metrics",
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in: "foo:200|ms:300|ms:5|c|@0.1:6|g\nbar:1|c:5|ms",
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out: Events{
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&TimerEvent{
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metricName: "foo",
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value: 200,
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},
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&TimerEvent{
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metricName: "foo",
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value: 300,
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},
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&CounterEvent{
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metricName: "foo",
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value: 50,
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},
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&GaugeEvent{
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metricName: "foo",
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value: 6,
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},
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&CounterEvent{
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metricName: "bar",
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value: 1,
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},
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&TimerEvent{
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metricName: "bar",
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value: 5,
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},
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},
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}, {
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name: "bad line",
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in: "foo",
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}, {
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name: "bad component",
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in: "foo:1",
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}, {
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name: "bad value",
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in: "foo:1o|c",
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}, {
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name: "illegal sampling factor",
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in: "foo:1|c|@bar",
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}, {
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name: "zero sampling factor",
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in: "foo:2|c|@0",
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out: Events{
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&CounterEvent{
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metricName: "foo",
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value: 2,
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},
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},
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}, {
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name: "illegal stat type",
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in: "foo:2|t",
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},
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}
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l := StatsDListener{}
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events := make(chan Events, 32)
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for i, scenario := range scenarios {
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l.handlePacket([]byte(scenario.in), events)
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// Flatten actual events.
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actual := Events{}
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for i := 0; i < len(events); i++ {
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actual = append(actual, <-events...)
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}
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if len(actual) != len(scenario.out) {
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t.Fatalf("%d. Expected %d events, got %d", i, len(scenario.out), len(actual))
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}
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for j, expected := range scenario.out {
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if fmt.Sprintf("%v", actual[j]) != fmt.Sprintf("%v", expected) {
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t.Fatalf("%d.%d. Expected %v, got %v", i, j, actual[j], expected)
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}
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}
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}
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}
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