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/*
* Copyright (c) 2021. Ant Group. All rights reserved.
* Copyright (c) 2023. Nydus Developers. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package metrics
import (
"fmt"
"net"
"net/http"
"github.com/containerd/containerd/log"
"github.com/containerd/nydus-snapshotter/pkg/metrics/registry"
"github.com/pkg/errors"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// Endpoint for prometheus metrics
var endpointPromMetrics = "/v1/metrics"
func trapClosedConnErr(err error) error {
if err == nil || errors.Is(err, net.ErrClosed) {
return nil
}
return err
}
// NewListener creates a new TCP listener bound to the given address.
func NewMetricsHTTPListenerServer(addr string) error {
if addr == "" {
return fmt.Errorf("the address for metrics HTTP server is invalid")
}
http.Handle(endpointPromMetrics, promhttp.HandlerFor(registry.Registry, promhttp.HandlerOpts{
ErrorHandling: promhttp.HTTPErrorOnError,
}))
l, err := net.Listen("tcp", addr)
if err != nil {
return errors.Wrapf(err, "metrics server listener, addr=%s", addr)
}
go func() {
if err := http.Serve(l, nil); trapClosedConnErr(err) != nil {
log.L.Errorf("Metrics server fails to listen or serve %s: %v", addr, err)
}
}()
return nil
}
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