node_exporter/collector/netdev_common.go

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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 !nonetdev
// +build linux freebsd openbsd
package collector
import (
"flag"
"fmt"
"regexp"
"strconv"
"github.com/prometheus/client_golang/prometheus"
)
var (
netdevIgnoredDevices = flag.String(
"collector.netdev.ignored-devices", "^$",
"Regexp of net devices to ignore for netdev collector.")
)
type netDevCollector struct {
subsystem string
ignoredDevicesPattern *regexp.Regexp
metricDescs map[string]*prometheus.Desc
}
func init() {
Factories["netdev"] = NewNetDevCollector
}
// NewNetDevCollector returns a new Collector exposing network device stats.
func NewNetDevCollector() (Collector, error) {
pattern := regexp.MustCompile(*netdevIgnoredDevices)
return &netDevCollector{
subsystem: "network",
ignoredDevicesPattern: pattern,
metricDescs: map[string]*prometheus.Desc{},
}, nil
}
func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
netDev, err := getNetDevStats(c.ignoredDevicesPattern)
if err != nil {
return fmt.Errorf("couldn't get netstats: %s", err)
}
for dev, devStats := range netDev {
for key, value := range devStats {
desc, ok := c.metricDescs[key]
if !ok {
desc = prometheus.NewDesc(
prometheus.BuildFQName(Namespace, c.subsystem, key),
fmt.Sprintf("Network device statistic %s.", key),
[]string{"device"},
nil,
)
c.metricDescs[key] = desc
}
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return fmt.Errorf("invalid value %s in netstats: %s", value, err)
}
ch <- prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, v, dev)
}
}
return nil
}