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add health endpoint for NATS check and stop service if NATS closed #8

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merged 1 commit into from
Nov 12, 2024
Merged

add health endpoint for NATS check and stop service if NATS closed #8

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18 changes: 18 additions & 0 deletions cmd/root.go
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ package cmd
import (
"fmt"
"net/http"
_ "net/http/pprof"
"os"
"strings"

Expand Down Expand Up @@ -84,6 +85,7 @@ func start(cmd *cobra.Command, args []string) error {
go ex.WatchForServices(viper.GetInt("scrape_interval"))

http.Handle("/metrics", promhttp.Handler())
http.Handle("GET /healthz", http.HandlerFunc(health(nc)))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
resp := fmt.Sprintf("<html>" +
"<head><title>Micro Stats Exporter</title></head>" +
Expand All @@ -93,10 +95,26 @@ func start(cmd *cobra.Command, args []string) error {
fmt.Fprint(w, resp)
})

go func() {
for {
a := <-nc.StatusChanged(nats.CLOSED)
logr.Fatalf("NATS connection: %v", a)
}
}()

port := fmt.Sprintf(":%d", viper.GetInt("port"))
logr.Infof("starting server: %s", port)
return http.ListenAndServe(port, nil)
}

func health(nc *nats.Conn) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if !nc.IsConnected() {
logr.Error("NATS is not connected")
http.Error(w, "internal server error", 500)
return
}
}
}

func newNatsConnection(name string) (*nats.Conn, error) {
Expand Down
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