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main.go
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package main
import (
"bytes"
"context"
"flag"
"net/http"
"os"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
)
const (
defaultLogLevel = log.InfoLevel
)
func initLogger() {
log.SetLevel(getLogLevel())
if strings.ToUpper(config.OutputFormat) == "JSON" {
log.SetFormatter(&log.JSONFormatter{})
} else {
// The TextFormatter is default, you don't actually have to do this.
log.SetFormatter(&log.TextFormatter{})
}
}
func main() {
var checkURL = flag.String("check-url", "", "Curl url and return exit code (http: 200 => 0, otherwise 1)")
var configFile = flag.String("config-file", "conf/rabbitmq.conf", "path to json config")
flag.Parse()
if *checkURL != "" { // do a single http get request. Used in docker healthckecks as curl is not inside the image
curl(*checkURL)
return
}
err := initConfigFromFile(*configFile) //Try parsing config file
if _, isPathError := err.(*os.PathError); isPathError { // No file => use environment variables
initConfig()
} else if err != nil {
panic(err)
}
initLogger()
initClient()
exporter := newExporter()
prometheus.MustRegister(exporter)
log.WithFields(log.Fields{
"VERSION": Version,
"REVISION": Revision,
"BRANCH": Branch,
"BUILD_DATE": BuildDate,
// "RABBIT_PASSWORD": config.RABBIT_PASSWORD,
}).Info("Starting RabbitMQ exporter")
log.WithFields(log.Fields{
"PUBLISH_ADDR": config.PublishAddr,
"PUBLISH_PORT": config.PublishPort,
"RABBIT_URL": config.RabbitURL,
"RABBIT_USER": config.RabbitUsername,
"RABBIT_CONNECTION": config.RabbitConnection,
"OUTPUT_FORMAT": config.OutputFormat,
"RABBIT_CAPABILITIES": formatCapabilities(config.RabbitCapabilities),
"RABBIT_EXPORTERS": config.EnabledExporters,
"CAFILE": config.CAFile,
"CERTFILE": config.CertFile,
"KEYFILE": config.KeyFile,
"SKIPVERIFY": config.InsecureSkipVerify,
"EXCLUDE_METRICS": config.ExcludeMetrics,
"SKIP_EXCHANGES": config.SkipExchanges.String(),
"INCLUDE_EXCHANGES": config.IncludeExchanges.String(),
"SKIP_QUEUES": config.SkipQueues.String(),
"INCLUDE_QUEUES": config.IncludeQueues.String(),
"SKIP_VHOST": config.SkipVHost.String(),
"INCLUDE_VHOST": config.IncludeVHost.String(),
"RABBIT_TIMEOUT": config.Timeout,
"MAX_QUEUES": config.MaxQueues,
// "RABBIT_PASSWORD": config.RABBIT_PASSWORD,
}).Info("Active Configuration")
handler := http.NewServeMux()
handler.Handle("/metrics", promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{}))
handler.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, _ = w.Write([]byte(`<html>
<head><title>RabbitMQ Exporter</title></head>
<body>
<h1>RabbitMQ Exporter</h1>
<p><a href='/metrics'>Metrics</a></p>
</body>
</html>`))
})
handler.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
if exporter.LastScrapeOK() {
w.WriteHeader(http.StatusOK)
} else {
w.WriteHeader(http.StatusGatewayTimeout)
}
})
server := &http.Server{Addr: config.PublishAddr + ":" + config.PublishPort, Handler: handler}
go func() {
if err := server.ListenAndServe(); err != nil {
log.Fatal(err)
}
}()
<-runService()
log.Info("Shutting down")
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
if err := server.Shutdown(ctx); err != nil {
log.Fatal(err)
}
cancel()
}
func getLogLevel() log.Level {
lvl := strings.ToLower(os.Getenv("LOG_LEVEL"))
level, err := log.ParseLevel(lvl)
if err != nil {
level = defaultLogLevel
}
return level
}
func formatCapabilities(caps rabbitCapabilitySet) string {
var buffer bytes.Buffer
first := true
for k := range caps {
if !first {
buffer.WriteString(",")
}
first = false
buffer.WriteString(string(k))
}
return buffer.String()
}