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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
package collector
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
type tcpConnectionState int
const (
// 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
)
type tcpStatCollector struct {
desc typedDesc
}
func init() {
registerCollector("tcpstat", defaultDisabled, NewTCPStatCollector)
}
// NewTCPStatCollector returns a new Collector exposing network stats.
func NewTCPStatCollector() (Collector, error) {
return &tcpStatCollector{
desc: typedDesc{prometheus.NewDesc(
prometheus.BuildFQName(namespace, "tcp", "connection_states"),
"Number of connection states.",
[]string{"state"}, nil,
), prometheus.GaugeValue},
}, nil
}
func (c *tcpStatCollector) Update(ch chan<- prometheus.Metric) error {
tcpStats, err := getTCPStats(procFilePath("net/tcp"))
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)
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())
}
return nil
}
func getTCPStats(statsFile string) (map[tcpConnectionState]float64, error) {
file, err := os.Open(statsFile)
if err != nil {
return nil, err
}
defer file.Close()
return parseTCPStats(file)
}
func parseTCPStats(r io.Reader) (map[tcpConnectionState]float64, error) {
var (
tcpStats = map[tcpConnectionState]float64{}
scanner = bufio.NewScanner(r)
)
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
if len(parts) == 0 {
continue
}
if len(parts) < 4 {
return nil, fmt.Errorf("invalid TCP stats line: %q", scanner.Text())
}
if strings.HasPrefix(parts[0], "sl") {
continue
}
st, err := strconv.ParseInt(parts[3], 16, 8)
if err != nil {
return nil, err
}
tcpStats[tcpConnectionState(st)]++
}
return tcpStats, scanner.Err()
}
func (st tcpConnectionState) String() string {
switch st {
case tcpEstablished:
return "established"
case tcpSynSent:
return "syn_sent"
case tcpSynRecv:
return "syn_recv"
case tcpFinWait1:
return "fin_wait1"
case tcpFinWait2:
return "fin_wait2"
case tcpTimeWait:
return "time_wait"
case tcpClose:
return "close"
case tcpCloseWait:
return "close_wait"
case tcpLastAck:
return "last_ack"
case tcpListen:
return "listen"
case tcpClosing:
return "closing"
default:
return "unknown"
}
}
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