Kiu/Node_Exporter
Kiu/Node_Exporter
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Move exporter to main and listen/interval to flags

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This commit is contained in:
Johannes 'fish' Ziemke 2014-02-18 12:35:11 +01:00
parent 9f0dcc1d91
commit 3ac5222f8b
9 changed files with 164 additions and 193 deletions
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21
collector/collector.go Normal file
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@ -0,0 +1,21 @@
// Exporter is a prometheus exporter using multiple Factories to collect and export system metrics.
package collector
import (
"github.com/prometheus/client_golang/prometheus"
)
var Factories []func(Config, prometheus.Registry) (Collector, error)
// Interface a collector has to implement.
type Collector interface {
// Get new metrics and expose them via prometheus registry.
Update() (n int, err error)
// Returns the name of the collector
Name() string
}
type Config struct {
Attributes map[string]string `json:"attributes"`
}

0
exporter/ganglia/format.go → collector/ganglia/format.go
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13
exporter/gmond_collector.go → collector/gmond_collector.go
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@ -1,17 +1,18 @@
// +build ganglia
package exporter
package collector
import (
"bufio"
"encoding/xml"
"fmt"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/node_exporter/exporter/ganglia"
"io"
"net"
"regexp"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/node_exporter/collector/ganglia"
)
const (
@ -23,18 +24,18 @@ const (
type gmondCollector struct {
name string
Metrics map[string]prometheus.Gauge
config config
config Config
registry prometheus.Registry
}
func init() {
collectorFactories = append(collectorFactories, NewGmondCollector)
Factories = append(Factories, NewGmondCollector)
}
var illegalCharsRE = regexp.MustCompile(`[^a-zA-Z0-9_]`)
// Takes a config struct and prometheus registry and returns a new Collector scraping ganglia.
func NewGmondCollector(config config, registry prometheus.Registry) (Collector, error) {
func NewGmondCollector(config Config, registry prometheus.Registry) (Collector, error) {
c := gmondCollector{
name: "gmond_collector",
config: config,

5
exporter/helper.go → collector/helper.go
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@ -1,12 +1,15 @@
package exporter
package collector
import (
"flag"
"fmt"
"log"
"strconv"
"strings"
)
var verbose = flag.Bool("verbose", false, "Verbose output.")
func debug(name string, format string, a ...interface{}) {
if *verbose {
f := fmt.Sprintf("%s: %s", name, format)

13
exporter/native_collector.go → collector/native_collector.go
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@ -1,11 +1,10 @@
// +build !nonative
package exporter
package collector
import (
"bufio"
"fmt"
"github.com/prometheus/client_golang/prometheus"
"io"
"io/ioutil"
"os"
@ -13,6 +12,8 @@ import (
"strconv"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus"
)
const (
@ -42,16 +43,16 @@ type nativeCollector struct {
netStats prometheus.Counter
diskStats prometheus.Counter
name string
config config
config Config
}
func init() {
collectorFactories = append(collectorFactories, NewNativeCollector)
Factories = append(Factories, NewNativeCollector)
}
// Takes a config struct and prometheus registry and returns a new Collector exposing
// load, seconds since last login and a list of tags as specified by config.
func NewNativeCollector(config config, registry prometheus.Registry) (Collector, error) {
func NewNativeCollector(config Config, registry prometheus.Registry) (Collector, error) {
c := nativeCollector{
name: "native_collector",
config: config,
@ -160,7 +161,7 @@ func (c *nativeCollector) Update() (updates int, err error) {
updates++
fv, err := strconv.ParseFloat(value, 64)
if err != nil {
return updates, fmt.Errorf("Invalid value in interrupts: %s", fv, err)
return updates, fmt.Errorf("Invalid value %s in interrupts: %s", value, err)
}
labels := map[string]string{
"CPU": strconv.Itoa(cpuNo),

8
exporter/runit_collector.go → collector/runit_collector.go
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@ -1,6 +1,6 @@
// +build runit
package exporter
package collector
import (
"github.com/prometheus/client_golang/prometheus"
@ -9,17 +9,17 @@ import (
type runitCollector struct {
name string
config config
config Config
state prometheus.Gauge
stateDesired prometheus.Gauge
stateNormal prometheus.Gauge
}
func init() {
collectorFactories = append(collectorFactories, NewRunitCollector)
Factories = append(Factories, NewRunitCollector)
}
func NewRunitCollector(config config, registry prometheus.Registry) (Collector, error) {
func NewRunitCollector(config Config, registry prometheus.Registry) (Collector, error) {
c := runitCollector{
name: "runit_collector",
config: config,

167
exporter/exporter.go
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@ -1,167 +0,0 @@
// Exporter is a prometheus exporter using multiple collectorFactories to collect and export system metrics.
package exporter
import (
"encoding/json"
"flag"
"fmt"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/exp"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"runtime/pprof"
"sync"
"syscall"
"time"
)
var verbose = flag.Bool("verbose", false, "Verbose output.")
var collectorFactories []func(config, prometheus.Registry) (Collector, error)
// Interface a collector has to implement.
type Collector interface {
// Get new metrics and expose them via prometheus registry.
Update() (n int, err error)
// Returns the name of the collector
Name() string
}
type config struct {
Attributes map[string]string `json:"attributes"`
ListeningAddress string `json:"listeningAddress"`
ScrapeInterval int `json:"scrapeInterval"`
}
func (e *exporter) loadConfig() (err error) {
log.Printf("Reading config %s", e.configFile)
bytes, err := ioutil.ReadFile(e.configFile)
if err != nil {
return
}
return json.Unmarshal(bytes, &e.config) // Make sure this is safe
}
type exporter struct {
configFile string
listeningAddress string
scrapeInterval time.Duration
scrapeDurations prometheus.Histogram
metricsUpdated prometheus.Gauge
config config
registry prometheus.Registry
Collectors []Collector
MemProfile string
}
// New takes the path to a config file and returns an exporter instance
func New(configFile string) (e exporter, err error) {
registry := prometheus.NewRegistry()
e = exporter{
configFile: configFile,
scrapeDurations: prometheus.NewDefaultHistogram(),
metricsUpdated: prometheus.NewGauge(),
listeningAddress: ":8080",
scrapeInterval: 60 * time.Second,
registry: registry,
}
err = e.loadConfig()
if err != nil {
return e, fmt.Errorf("Couldn't read config: %s", err)
}
for _, fn := range collectorFactories {
c, err := fn(e.config, e.registry)
if err != nil {
return e, err
}
e.Collectors = append(e.Collectors, c)
}
if e.config.ListeningAddress != "" {
e.listeningAddress = e.config.ListeningAddress
}
if e.config.ScrapeInterval != 0 {
e.scrapeInterval = time.Duration(e.config.ScrapeInterval) * time.Second
}
registry.Register("node_exporter_scrape_duration_seconds", "node_exporter: Duration of a scrape job.", prometheus.NilLabels, e.scrapeDurations)
registry.Register("node_exporter_metrics_updated", "node_exporter: Number of metrics updated.", prometheus.NilLabels, e.metricsUpdated)
return e, nil
}
func (e *exporter) serveStatus() {
exp.Handle(prometheus.ExpositionResource, e.registry.Handler())
http.ListenAndServe(e.listeningAddress, exp.DefaultCoarseMux)
}
func (e *exporter) Execute(c Collector) {
begin := time.Now()
updates, err := c.Update()
duration := time.Since(begin)
label := map[string]string{
"collector": c.Name(),
}
if err != nil {
log.Printf("ERROR: %s failed after %fs: %s", c.Name(), duration.Seconds(), err)
label["result"] = "error"
} else {
log.Printf("OK: %s success after %fs.", c.Name(), duration.Seconds())
label["result"] = "success"
}
e.scrapeDurations.Add(label, duration.Seconds())
e.metricsUpdated.Set(label, float64(updates))
}
func (e *exporter) Loop() {
sigHup := make(chan os.Signal)
sigUsr1 := make(chan os.Signal)
signal.Notify(sigHup, syscall.SIGHUP)
signal.Notify(sigUsr1, syscall.SIGUSR1)
go e.serveStatus()
tick := time.Tick(e.scrapeInterval)
for {
select {
case <-sigHup:
err := e.loadConfig()
if err != nil {
log.Printf("Couldn't reload config: %s", err)
continue
}
log.Printf("Got new config")
tick = time.Tick(e.scrapeInterval)
case <-tick:
log.Printf("Starting new scrape interval")
wg := sync.WaitGroup{}
wg.Add(len(e.Collectors))
for _, c := range e.Collectors {
go func(c Collector) {
e.Execute(c)
wg.Done()
}(c)
}
wg.Wait()
case <-sigUsr1:
log.Printf("got signal")
if e.MemProfile != "" {
log.Printf("Writing memory profile to %s", e.MemProfile)
f, err := os.Create(e.MemProfile)
if err != nil {
log.Fatal(err)
}
pprof.WriteHeapProfile(f)
f.Close()
}
}
}
}

1
node_exporter.conf
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@ -1,5 +1,4 @@
{
"scrapeInterval": 10,
"attributes" : {
"web-server" : "1",
"zone" : "a",

129
node_exporter.go
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@ -1,27 +1,140 @@
package main
import (
"encoding/json"
"flag"
"io/ioutil"
"log"
"net/http"
"os"
"os/signal"
"runtime/pprof"
"sync"
"syscall"
"time"
"github.com/prometheus/node_exporter/exporter"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/exp"
"github.com/prometheus/node_exporter/collector"
)
var (
configFile = flag.String("config", "node_exporter.conf", "config file.")
memprofile = flag.String("memprofile", "", "write memory profile to this file")
configFile = flag.String("config", "node_exporter.conf", "config file.")
memProfile = flag.String("memprofile", "", "write memory profile to this file")
listeningAddress = flag.String("listen", ":8080", "address to listen on")
interval = flag.Duration("interval", 60*time.Second, "refresh interval")
scrapeDurations = prometheus.NewDefaultHistogram()
metricsUpdated = prometheus.NewGauge()
)
func main() {
flag.Parse()
exporter, err := exporter.New(*configFile)
registry := prometheus.NewRegistry()
collectors, err := loadCollectors(*configFile, registry)
if err != nil {
log.Fatalf("Couldn't instantiate exporter: %s", err)
log.Fatalf("Couldn't load config and collectors: %s", err)
}
registry.Register("node_exporter_scrape_duration_seconds", "node_exporter: Duration of a scrape job.", prometheus.NilLabels, scrapeDurations)
registry.Register("node_exporter_metrics_updated", "node_exporter: Number of metrics updated.", prometheus.NilLabels, metricsUpdated)
log.Printf("Registered collectors:")
for _, c := range exporter.Collectors {
for _, c := range collectors {
log.Print(" - ", c.Name())
}
exporter.Loop()
sigHup := make(chan os.Signal)
sigUsr1 := make(chan os.Signal)
signal.Notify(sigHup, syscall.SIGHUP)
signal.Notify(sigUsr1, syscall.SIGUSR1)
go serveStatus(registry)
tick := time.Tick(*interval)
for {
select {
case <-sigHup:
collectors, err = loadCollectors(*configFile, registry)
if err != nil {
log.Fatalf("Couldn't load config and collectors: %s", err)
}
log.Printf("Reload collectors and config")
tick = time.Tick(*interval)
case <-tick:
log.Printf("Starting new interval")
wg := sync.WaitGroup{}
wg.Add(len(collectors))
for _, c := range collectors {
go func(c collector.Collector) {
Execute(c)
wg.Done()
}(c)
}
wg.Wait()
case <-sigUsr1:
log.Printf("got signal")
if *memProfile != "" {
log.Printf("Writing memory profile to %s", *memProfile)
f, err := os.Create(*memProfile)
if err != nil {
log.Fatal(err)
}
pprof.WriteHeapProfile(f)
f.Close()
}
}
}
}
func loadCollectors(file string, registry prometheus.Registry) ([]collector.Collector, error) {
collectors := []collector.Collector{}
config, err := getConfig(file)
if err != nil {
log.Fatalf("Couldn't read config %s: %s", file, err)
}
for _, fn := range collector.Factories {
c, err := fn(*config, registry)
if err != nil {
return nil, err
}
collectors = append(collectors, c)
}
return collectors, nil
}
func getConfig(file string) (*collector.Config, error) {
config := &collector.Config{}
log.Printf("Reading config %s", *configFile)
bytes, err := ioutil.ReadFile(*configFile)
if err != nil {
return nil, err
}
return config, json.Unmarshal(bytes, &config)
}
func serveStatus(registry prometheus.Registry) {
exp.Handle(prometheus.ExpositionResource, registry.Handler())
http.ListenAndServe(*listeningAddress, exp.DefaultCoarseMux)
}
func Execute(c collector.Collector) {
begin := time.Now()
updates, err := c.Update()
duration := time.Since(begin)
label := map[string]string{
"collector": c.Name(),
}
if err != nil {
log.Printf("ERROR: %s failed after %fs: %s", c.Name(), duration.Seconds(), err)
label["result"] = "error"
} else {
log.Printf("OK: %s success after %fs.", c.Name(), duration.Seconds())
label["result"] = "success"
}
scrapeDurations.Add(label, duration.Seconds())
metricsUpdated.Set(label, float64(updates))
}