mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-10 07:34:09 -08:00
113 lines
3 KiB
Go
113 lines
3 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 !nonetstat
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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netStatsSubsystem = "netstat"
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)
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type netStatCollector struct{}
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func init() {
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Factories["netstat"] = NewNetStatCollector
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}
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// NewNetStatCollector takes and returns
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// a new Collector exposing network stats.
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func NewNetStatCollector() (Collector, error) {
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return &netStatCollector{}, nil
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}
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func (c *netStatCollector) Update(ch chan<- prometheus.Metric) (err error) {
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netStats, err := getNetStats(procFilePath("net/netstat"))
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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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snmpStats, err := getNetStats(procFilePath("net/snmp"))
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if err != nil {
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return fmt.Errorf("couldn't get SNMP stats: %s", err)
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}
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// Merge the results of snmpStats into netStats (collisions are possible, but
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// we know that the keys are always unique for the given use case).
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for k, v := range snmpStats {
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netStats[k] = v
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}
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for protocol, protocolStats := range netStats {
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for name, value := range protocolStats {
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key := protocol + "_" + name
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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(
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prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, netStatsSubsystem, key),
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fmt.Sprintf("Protocol %s statistic %s.", protocol, name),
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nil, nil,
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),
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prometheus.UntypedValue, v,
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)
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}
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}
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return nil
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}
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func getNetStats(fileName string) (map[string]map[string]string, error) {
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file, err := os.Open(fileName)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return parseNetStats(file, fileName)
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}
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func parseNetStats(r io.Reader, fileName string) (map[string]map[string]string, error) {
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var (
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netStats = map[string]map[string]string{}
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scanner = bufio.NewScanner(r)
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)
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for scanner.Scan() {
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nameParts := strings.Split(string(scanner.Text()), " ")
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scanner.Scan()
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valueParts := strings.Split(string(scanner.Text()), " ")
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// Remove trailing :.
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protocol := nameParts[0][:len(nameParts[0])-1]
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netStats[protocol] = map[string]string{}
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if len(nameParts) != len(valueParts) {
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return nil, fmt.Errorf("mismatch field count mismatch in %s: %s",
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fileName, protocol)
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}
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for i := 1; i < len(nameParts); i++ {
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netStats[protocol][nameParts[i]] = valueParts[i]
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}
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}
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return netStats, nil
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}
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