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Get servers from prometheus #7

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Get servers from prometheus #7

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aaf19f8
Add .idea to .gitignore
Feb 25, 2018
26fa4ca
Get servers from prometheus
Feb 25, 2018
2e02d69
Fix bad if
Feb 25, 2018
4814581
Added zk_up and zk_version
Feb 26, 2018
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1 change: 1 addition & 0 deletions .gitignore
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,3 +2,4 @@
zookeeper_exporter
*.tar.gz
*-stamp
.idea/
41 changes: 35 additions & 6 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,15 +15,14 @@ import (

"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/log"
"github.com/prometheus/client_golang/prometheus/promhttp"
)

type Servers struct {
Servers []string `json:"servers"`
Port int `json:"port"`
}

const concurrentFetch = 100

// Commandline flags.
var (
useExhibitor = flag.Bool("exporter.use_exhibitor", false, "Use Exhibitor to discover ZooKeeper servers")
Expand All @@ -33,6 +32,7 @@ var (

var (
variableLabels = []string{"server"}
versionLabels = []string{"server", "version"}
)

var httpClient = http.Client{
Expand Down Expand Up @@ -158,7 +158,12 @@ func (e *exporter) pollServer(server string, ch chan<- prometheus.Metric, wg *sy

conn, err := net.Dial("tcp", server)
if err != nil {
e.recordErr(err)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
"zk_up",
"zk_up",
variableLabels, nil,
), prometheus.GaugeValue, 0, server)
return
}

Expand All @@ -175,7 +180,18 @@ func (e *exporter) pollServer(server string, ch chan<- prometheus.Metric, wg *sy

switch key {
case "zk_version":
continue
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
"zk_version",
"zk_version",
versionLabels, nil,
), prometheus.GaugeValue, 1, server, value)
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
"zk_up",
"zk_up",
variableLabels, nil,
), prometheus.GaugeValue, 1, server)
case "zk_server_state":
log.Debugf("%s: %d", key+"_"+value, 1)
ch <- prometheus.MustNewConstMetric(
Expand All @@ -197,12 +213,25 @@ func (e *exporter) pollServer(server string, ch chan<- prometheus.Metric, wg *sy
}
}

func exporterHandler(w http.ResponseWriter, r *http.Request, exporter *exporter) {
params := r.URL.Query()
if len(params["servers"]) != 0 {
exporter.addrs = params["servers"]
}
registry := prometheus.NewRegistry()
registry.MustRegister(exporter)
h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}

func main() {
flag.Parse()
exporter := newZooKeeperExporter(flag.Args(), *useExhibitor)
prometheus.MustRegister(exporter)

http.Handle(*metricPath, prometheus.Handler())
http.HandleFunc(*metricPath, func(w http.ResponseWriter, r *http.Request) {
exporterHandler(w, r, exporter)
})

http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, *metricPath, http.StatusMovedPermanently)
})
Expand Down