116 lines
2.9 KiB
Go
116 lines
2.9 KiB
Go
// +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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"github.com/prometheus/client_golang/prometheus"
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"io"
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"os"
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"strconv"
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"strings"
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)
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const (
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procSockStat = "/proc/net/sockstat"
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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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metrics map[string]prometheus.Gauge
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}
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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{
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metrics: map[string]prometheus.Gauge{},
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}, nil
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}
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func (c *sockStatCollector) Update(ch chan<- prometheus.Metric) (err error) {
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sockStats, err := getSockStats(procSockStat)
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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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key := protocol + "_" + name
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if _, ok := c.metrics[key]; !ok {
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c.metrics[key] = prometheus.NewGauge(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: sockStatSubsystem,
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Name: key,
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Help: fmt.Sprintf("%s %s from /proc/net/sockstat.", protocol, name),
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},
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)
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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 sockstats: %s", value, err)
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}
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c.metrics[key].Set(v)
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}
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}
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for _, m := range c.metrics {
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m.Collect(ch)
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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(string(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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// 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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pageCount, err = strconv.Atoi(sockStat["UDP"]["mem"])
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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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return sockStat, nil
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}
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