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package main
import (
"net"
"net/http"
"strings"
"time"
metrics "github.com/docker/go-metrics"
"github.com/sirupsen/logrus"
)
func startMetricsServer(addr string) error {
if addr == "" {
return nil
}
if err := allocateDaemonPort(addr); err != nil {
return err
}
l, err := net.Listen("tcp", addr)
if err != nil {
return err
}
mux := http.NewServeMux()
mux.Handle("/metrics", metrics.Handler())
go func() {
logrus.Infof("metrics API listening on %s", l.Addr())
srv := &http.Server{
Handler: mux,
ReadHeaderTimeout: 5 * time.Minute, // "G112: Potential Slowloris Attack (gosec)"; not a real concern for our use, so setting a long timeout.
}
if err := srv.Serve(l); err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
logrus.WithError(err).Error("error serving metrics API")
}
}()
return nil
}
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