mirror of
https://github.com/prometheus/node_exporter.git
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501ccf9fb4
* Add --collector.netdev.device-whitelist flag Sometimes it is desired to monitor only one netdev. The golang regexp does not support a negated regex, so the ignored-devices flag is too cumbersome for this task. This change introduces a new flag: accept-devices, which is mutually exclusive to ignored-devices. This flag allows specifying ONLY the netdev you'd like. Signed-off-by: Noam Meltzer <noam@cynerio.co>
95 lines
2.9 KiB
Go
95 lines
2.9 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nonetdev
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// +build linux freebsd openbsd dragonfly darwin
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package collector
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import (
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"errors"
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"fmt"
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"regexp"
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"strconv"
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"github.com/prometheus/client_golang/prometheus"
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"gopkg.in/alecthomas/kingpin.v2"
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)
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var (
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netdevIgnoredDevices = kingpin.Flag("collector.netdev.device-blacklist", "Regexp of net devices to blacklist (mutually exclusive to device-whitelist).").String()
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netdevAcceptDevices = kingpin.Flag("collector.netdev.device-whitelist", "Regexp of net devices to whitelist (mutually exclusive to device-blacklist).").String()
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)
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type netDevCollector struct {
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subsystem string
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ignoredDevicesPattern *regexp.Regexp
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acceptDevicesPattern *regexp.Regexp
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metricDescs map[string]*prometheus.Desc
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}
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func init() {
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registerCollector("netdev", defaultEnabled, NewNetDevCollector)
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}
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// NewNetDevCollector returns a new Collector exposing network device stats.
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func NewNetDevCollector() (Collector, error) {
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if *netdevIgnoredDevices != "" && *netdevAcceptDevices != "" {
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return nil, errors.New("device-blacklist & accept-devices are mutually exclusive")
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}
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var ignorePattern *regexp.Regexp = nil
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if *netdevIgnoredDevices != "" {
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ignorePattern = regexp.MustCompile(*netdevIgnoredDevices)
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}
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var acceptPattern *regexp.Regexp = nil
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if *netdevAcceptDevices != "" {
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acceptPattern = regexp.MustCompile(*netdevAcceptDevices)
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}
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return &netDevCollector{
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subsystem: "network",
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ignoredDevicesPattern: ignorePattern,
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acceptDevicesPattern: acceptPattern,
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metricDescs: map[string]*prometheus.Desc{},
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}, nil
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}
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func (c *netDevCollector) Update(ch chan<- prometheus.Metric) error {
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netDev, err := getNetDevStats(c.ignoredDevicesPattern, c.acceptDevicesPattern)
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if err != nil {
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return fmt.Errorf("couldn't get netstats: %s", err)
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}
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for dev, devStats := range netDev {
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for key, value := range devStats {
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desc, ok := c.metricDescs[key]
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if !ok {
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desc = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, c.subsystem, key+"_total"),
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fmt.Sprintf("Network device statistic %s.", key),
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[]string{"device"},
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nil,
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)
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c.metricDescs[key] = desc
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}
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return fmt.Errorf("invalid value %s in netstats: %s", value, err)
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}
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ch <- prometheus.MustNewConstMetric(desc, prometheus.CounterValue, v, dev)
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}
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}
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return nil
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}
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