node_exporter/collector/tcpstat_linux.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 !notcpstat
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package collector
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
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type tcpConnectionState int
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const (
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// TCP_ESTABLISHED
tcpEstablished tcpConnectionState = iota + 1
// TCP_SYN_SENT
tcpSynSent
// TCP_SYN_RECV
tcpSynRecv
// TCP_FIN_WAIT1
tcpFinWait1
// TCP_FIN_WAIT2
tcpFinWait2
// TCP_TIME_WAIT
tcpTimeWait
// TCP_CLOSE
tcpClose
// TCP_CLOSE_WAIT
tcpCloseWait
// TCP_LAST_ACK
tcpLastAck
// TCP_LISTEN
tcpListen
// TCP_CLOSING
tcpClosing
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)
type tcpStatCollector struct {
desc typedDesc
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}
func init() {
registerCollector("tcpstat", defaultDisabled, NewTCPStatCollector)
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}
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// NewTCPStatCollector returns a new Collector exposing network stats.
func NewTCPStatCollector() (Collector, error) {
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return &tcpStatCollector{
desc: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, "tcp", "connection_states"),
"Number of connection states.",
[]string{"state"}, nil,
), prometheus.GaugeValue},
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}, nil
}
func (c *tcpStatCollector) Update(ch chan<- prometheus.Metric) error {
tcpStats, err := getTCPStats(procFilePath("net/tcp"))
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if err != nil {
return fmt.Errorf("couldn't get tcpstats: %s", err)
}
// if enabled ipv6 system
tcp6File := procFilePath("net/tcp6")
if _, hasIPv6 := os.Stat(tcp6File); hasIPv6 == nil {
tcp6Stats, err := getTCPStats(tcp6File)
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if err != nil {
return fmt.Errorf("couldn't get tcp6stats: %s", err)
}
for st, value := range tcp6Stats {
tcpStats[st] += value
}
}
for st, value := range tcpStats {
ch <- c.desc.mustNewConstMetric(value, st.String())
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}
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return nil
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}
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func getTCPStats(statsFile string) (map[tcpConnectionState]float64, error) {
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file, err := os.Open(statsFile)
if err != nil {
return nil, err
}
defer file.Close()
return parseTCPStats(file)
}
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func parseTCPStats(r io.Reader) (map[tcpConnectionState]float64, error) {
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var (
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tcpStats = map[tcpConnectionState]float64{}
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scanner = bufio.NewScanner(r)
)
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
if len(parts) == 0 {
continue
}
if strings.HasPrefix(parts[0], "sl") {
continue
}
st, err := strconv.ParseInt(parts[3], 16, 8)
if err != nil {
return nil, err
}
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tcpStats[tcpConnectionState(st)]++
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}
return tcpStats, scanner.Err()
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}
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func (st tcpConnectionState) String() string {
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switch st {
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case tcpEstablished:
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return "established"
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case tcpSynSent:
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return "syn_sent"
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case tcpSynRecv:
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return "syn_recv"
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case tcpFinWait1:
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return "fin_wait1"
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case tcpFinWait2:
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return "fin_wait2"
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case tcpTimeWait:
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return "time_wait"
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case tcpClose:
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return "close"
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case tcpCloseWait:
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return "close_wait"
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case tcpLastAck:
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return "last_ack"
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case tcpListen:
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return "listen"
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case tcpClosing:
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return "closing"
default:
return "unknown"
}
}