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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 !nosockstat
package collector
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
const (
sockStatSubsystem = "sockstat"
)
// Used for calculating the total memory bytes on TCP and UDP.
var pageSize = os.Getpagesize()
type sockStatCollector struct{}
func init() {
registerCollector(sockStatSubsystem, defaultEnabled, NewSockStatCollector)
}
// NewSockStatCollector returns a new Collector exposing socket stats.
func NewSockStatCollector() (Collector, error) {
return &sockStatCollector{}, nil
}
func (c *sockStatCollector) Update(ch chan<- prometheus.Metric) error {
sockStats, err := getSockStats(procFilePath("net/sockstat"))
if err != nil {
return fmt.Errorf("couldn't get sockstats: %s", err)
}
for protocol, protocolStats := range sockStats {
for name, value := range protocolStats {
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return fmt.Errorf("invalid value %s in sockstats: %s", value, err)
}
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, sockStatSubsystem, protocol+"_"+name),
fmt.Sprintf("Number of %s sockets in state %s.", protocol, name),
nil, nil,
),
prometheus.GaugeValue, v,
)
}
}
return err
}
func getSockStats(fileName string) (map[string]map[string]string, error) {
file, err := os.Open(fileName)
if err != nil {
return nil, err
}
defer file.Close()
return parseSockStats(file, fileName)
}
func parseSockStats(r io.Reader, fileName string) (map[string]map[string]string, error) {
var (
sockStat = map[string]map[string]string{}
scanner = bufio.NewScanner(r)
)
for scanner.Scan() {
line := strings.Split(scanner.Text(), " ")
// Remove trailing ':'.
protocol := line[0][:len(line[0])-1]
sockStat[protocol] = map[string]string{}
for i := 1; i < len(line) && i+1 < len(line); i++ {
sockStat[protocol][line[i]] = line[i+1]
i++
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
// The mem metrics is the count of pages used. Multiply the mem metrics by
// the page size from the kernel to get the number of bytes used.
//
// Update the TCP mem from page count to bytes.
pageCount, err := strconv.Atoi(sockStat["TCP"]["mem"])
if err != nil {
return nil, fmt.Errorf("invalid value %s in sockstats: %s", sockStat["TCP"]["mem"], err)
}
sockStat["TCP"]["mem_bytes"] = strconv.Itoa(pageCount * pageSize)
// Update the UDP mem from page count to bytes.
if udpMem := sockStat["UDP"]["mem"]; udpMem != "" {
pageCount, err = strconv.Atoi(udpMem)
if err != nil {
return nil, fmt.Errorf("invalid value %s in sockstats: %s", sockStat["UDP"]["mem"], err)
}
sockStat["UDP"]["mem_bytes"] = strconv.Itoa(pageCount * pageSize)
}
return sockStat, nil
}
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