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https://github.com/prometheus/node_exporter.git
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922e74d58f
Named return variables should only be used to describe the returned type further, e.g. `err error` doesn't add any new information and is just stutter.
123 lines
3.3 KiB
Go
123 lines
3.3 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 !nosockstat
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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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sockStatSubsystem = "sockstat"
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)
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// Used for calculating the total memory bytes on TCP and UDP.
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var pageSize = os.Getpagesize()
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type sockStatCollector struct{}
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func init() {
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Factories[sockStatSubsystem] = NewSockStatCollector
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}
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// NewSockStatCollector returns a new Collector exposing socket stats.
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func NewSockStatCollector() (Collector, error) {
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return &sockStatCollector{}, nil
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}
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func (c *sockStatCollector) Update(ch chan<- prometheus.Metric) error {
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sockStats, err := getSockStats(procFilePath("net/sockstat"))
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if err != nil {
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return fmt.Errorf("couldn't get sockstats: %s", err)
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}
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for protocol, protocolStats := range sockStats {
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for name, value := range protocolStats {
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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 sockstats: %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, sockStatSubsystem, protocol+"_"+name),
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fmt.Sprintf("Number of %s sockets in state %s.", protocol, name),
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nil, nil,
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),
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prometheus.GaugeValue, v,
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)
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}
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}
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return err
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}
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func getSockStats(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 parseSockStats(file, fileName)
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}
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func parseSockStats(r io.Reader, fileName string) (map[string]map[string]string, error) {
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var (
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sockStat = 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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line := strings.Split(scanner.Text(), " ")
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// Remove trailing ':'.
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protocol := line[0][:len(line[0])-1]
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sockStat[protocol] = map[string]string{}
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for i := 1; i < len(line) && i+1 < len(line); i++ {
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sockStat[protocol][line[i]] = line[i+1]
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i++
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}
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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// The mem metrics is the count of pages used. Multiply the mem metrics by
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// the page size from the kernel to get the number of bytes used.
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//
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// Update the TCP mem from page count to bytes.
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pageCount, err := strconv.Atoi(sockStat["TCP"]["mem"])
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if err != nil {
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return nil, fmt.Errorf("invalid value %s in sockstats: %s", sockStat["TCP"]["mem"], err)
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}
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sockStat["TCP"]["mem_bytes"] = strconv.Itoa(pageCount * pageSize)
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// Update the UDP mem from page count to bytes.
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if udpMem := sockStat["UDP"]["mem"]; udpMem != "" {
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pageCount, err = strconv.Atoi(udpMem)
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if err != nil {
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return nil, fmt.Errorf("invalid value %s in sockstats: %s", sockStat["UDP"]["mem"], err)
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}
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sockStat["UDP"]["mem_bytes"] = strconv.Itoa(pageCount * pageSize)
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}
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return sockStat, nil
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}
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