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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !noudp_queues
package collector
import (
"errors"
"fmt"
"os"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/procfs"
)
type (
udpQueuesCollector struct {
fs procfs.FS
desc *prometheus.Desc
logger log.Logger
}
)
func init() {
registerCollector("udp_queues", defaultEnabled, NewUDPqueuesCollector)
}
// NewUDPqueuesCollector returns a new Collector exposing network udp queued bytes.
func NewUDPqueuesCollector(logger log.Logger) (Collector, error) {
fs, err := procfs.NewFS(*procPath)
if err != nil {
return nil, fmt.Errorf("failed to open procfs: %w", err)
}
return &udpQueuesCollector{
fs: fs,
desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "udp", "queues"),
"Number of allocated memory in the kernel for UDP datagrams in bytes.",
[]string{"queue", "ip"}, nil,
),
logger: logger,
}, nil
}
func (c *udpQueuesCollector) Update(ch chan<- prometheus.Metric) error {
s4, errIPv4 := c.fs.NetUDPSummary()
if errIPv4 == nil {
ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s4.TxQueueLength), "tx", "v4")
ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s4.RxQueueLength), "rx", "v4")
} else {
if errors.Is(errIPv4, os.ErrNotExist) {
level.Debug(c.logger).Log("msg", "not collecting ipv4 based metrics")
} else {
return fmt.Errorf("couldn't get upd queued bytes: %w", errIPv4)
}
}
s6, errIPv6 := c.fs.NetUDP6Summary()
if errIPv6 == nil {
ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s6.TxQueueLength), "tx", "v6")
ch <- prometheus.MustNewConstMetric(c.desc, prometheus.GaugeValue, float64(s6.RxQueueLength), "rx", "v6")
} else {
if errors.Is(errIPv6, os.ErrNotExist) {
level.Debug(c.logger).Log("msg", "not collecting ipv6 based metrics")
} else {
return fmt.Errorf("couldn't get upd6 queued bytes: %w", errIPv6)
}
}
if errors.Is(errIPv4, os.ErrNotExist) && errors.Is(errIPv6, os.ErrNotExist) {
return ErrNoData
}
return nil
}
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