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nodepool_exporter.go
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/
nodepool_exporter.go
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// Copyright 2013 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"io/ioutil"
"net/http"
"sync"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
"gopkg.in/alecthomas/kingpin.v2"
)
const (
namespace = "nodepool" // For Prometheus metrics.
)
func init() {
prometheus.MustRegister(version.NewCollector("nodepool_exporter"))
}
type Host struct {
name string
port string
}
type Exporter struct {
scrapeHost Host
mutex sync.Mutex
client *http.Client
up *prometheus.Desc
scrapeFailures prometheus.Counter
}
func NewExporter(host Host) *Exporter {
return &Exporter{
scrapeHost: host,
client: &http.Client{
Transport: &http.Transport{
TLSClientConfig: nil},
},
up: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "up"),
"Could the nodepool server be reached",
[]string{"host"},
nil),
scrapeFailures: prometheus.NewCounter(prometheus.CounterOpts{
Namespace: namespace,
Name: "exporter_scrape_failures_total",
Help: "Number of errors while scraping apache.",
}),
}
}
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- e.up
e.scrapeFailures.Describe(ch)
}
func (e *Exporter) collect(ch chan<- prometheus.Metric) error {
scrapeURI := "http://" + e.scrapeHost.name + ":" + e.scrapeHost.port + "/image-list"
resp, err := e.client.Get(scrapeURI)
if err != nil {
ch <- prometheus.MustNewConstMetric(e.up, prometheus.GaugeValue, 0, e.scrapeHost.name)
return fmt.Errorf("Error scraping nodepool: %v", err)
}
ch <- prometheus.MustNewConstMetric(e.up, prometheus.GaugeValue, 1, e.scrapeHost.name)
data, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if resp.StatusCode != 200 {
if err != nil {
data = []byte(err.Error())
}
return fmt.Errorf("Status %s (%d): %s", resp.Status, resp.StatusCode, data)
}
return nil
}
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
e.mutex.Lock() // To protect metrics from concurrent collects.
defer e.mutex.Unlock()
if err := e.collect(ch); err != nil {
log.Errorf("Error scraping nodepool: %s", err)
e.scrapeFailures.Inc()
e.scrapeFailures.Collect(ch)
}
return
}
func main() {
var (
listenAddress = kingpin.Flag("web.listen-address", "The address on which to expose the web interface and generated Prometheus metrics.").Default(":9533").String()
metricsEndpoint = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
nodepoolHost = kingpin.Flag("nodepool.listen-host", "The nodepool hostname.").Default("localhost").String()
nodepoolPort = kingpin.Flag("nodepool.listen-port", "The nodepool port.").Default("8005").String()
)
log.AddFlags(kingpin.CommandLine)
kingpin.Version(version.Print("nodepool_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
host := Host{name: *nodepoolHost, port: *nodepoolPort}
exporter := NewExporter(host)
prometheus.MustRegister(exporter)
log.Infoln("Starting Nodepool -> Prometheus Exporter", version.Info())
log.Infoln("Build context", version.BuildContext())
log.Infof("Accepting nodepool address: %s:%s", *nodepoolHost, *nodepoolPort)
log.Infof("Accepting Prometheus Requests on %s", *listenAddress)
http.Handle(*metricsEndpoint, prometheus.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Nodepool Exporter</title></head>
<body>
<h1>Nodepool Exporter</h1>
<p><a href="` + *metricsEndpoint + `">Metrics</a></p>
</body>
</html>`))
})
log.Fatal(http.ListenAndServe(*listenAddress, nil))
}