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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 TCPConnectionState = iota + 1
TCP_SYN_SENT
TCP_SYN_RECV
TCP_FIN_WAIT1
TCP_FIN_WAIT2
TCP_TIME_WAIT
TCP_CLOSE
TCP_CLOSE_WAIT
TCP_LAST_ACK
TCP_LISTEN
TCP_CLOSING
)
type tcpStatCollector struct {
metric *prometheus.GaugeVec
}
func init() {
Factories["tcpstat"] = NewTCPStatCollector
}
// NewTCPStatCollector takes a returns
// a new Collector exposing network stats.
func NewTCPStatCollector() (Collector, error) {
return &tcpStatCollector{
metric: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: Namespace,
Name: "tcp_connection_states",
Help: "Number of connection states.",
},
[]string{"state"},
),
}, nil
}
func (c *tcpStatCollector) Update(ch chan<- prometheus.Metric) (err 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 {
c.metric.WithLabelValues(st.String()).Set(value)
}
c.metric.Collect(ch)
return err
}
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 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, nil
}
func (st TCPConnectionState) String() string {
switch st {
case TCP_ESTABLISHED:
return "established"
case TCP_SYN_SENT:
return "syn_sent"
case TCP_SYN_RECV:
return "syn_recv"
case TCP_FIN_WAIT1:
return "fin_wait1"
case TCP_FIN_WAIT2:
return "fin_wait2"
case TCP_TIME_WAIT:
return "time_wait"
case TCP_CLOSE:
return "close"
case TCP_CLOSE_WAIT:
return "close_wait"
case TCP_LAST_ACK:
return "last_ack"
case TCP_LISTEN:
return "listen"
case TCP_CLOSING:
return "closing"
default:
return "unknown"
}
}
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