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net.go
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net.go
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package proc
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"regexp"
"strconv"
"strings"
)
var procNetProtoFiles = []string{"netstat", "snmp"}
// NetProtoStats parses the files /proc/net/netstat, and /proc/net/snmp.
// It returns the table of values as a 2-dimensional array from category -> key -> value. For example:
//
// {
// "Tcp": {
// "ActiveOpens": 11023,
// "PassiveOpens": 64,
// ...
// },
// "Udp": {...},
// ...
// }
func NetProtoStats() (map[string]map[string]int64, error) {
result := make(map[string]map[string]int64)
for _, filename := range procNetProtoFiles {
f, err := os.Open("/proc/net/" + filename)
if err != nil {
continue
}
defer f.Close()
reader := bufio.NewReader(f)
keys := []string{}
for {
line, err := reader.ReadString('\n')
if err != nil {
if err == io.EOF {
if len(keys) > 0 {
return nil, errors.New("header line without a following data line")
}
break
}
return nil, err
}
if len(keys) == 0 {
keys = strings.Fields(line)
} else {
values := strings.Fields(line)
if len(values) != len(keys) {
return nil, errors.New("value line of a different length than the header line")
}
if keys[0] != values[0] || !strings.HasSuffix(keys[0], ":") {
return nil, errors.New("header or value lines don't match or don't start with a label")
}
label := keys[0][:len(keys[0])-1]
lineMap := make(map[string]int64)
for i, key := range keys {
if i == 0 {
continue
}
v, err := strconv.ParseInt(values[i], 10, 64)
if err != nil {
return nil, errors.New("could not parse value")
}
lineMap[key] = v
}
result[label] = lineMap
keys = nil
}
}
f.Close() // Double close is fine
}
if len(result) == 0 {
return nil, fmt.Errorf("none of the required /proc/net/ files could be found")
}
return result, nil
}
var (
netDevHeader = regexp.MustCompile(`^Inter-|\s*Receive\s*|\s*Transmit\s*$`)
errNetDev = errors.New("goproc: error parsing /proc/net/dev")
)
// NetDevStats returns the data in /proc/net/dev.
// Example:
// eth0 -> bytes -> 12345
func NetDevStats() (receive, transmit map[string]map[string]uint64, err error) {
receive = make(map[string]map[string]uint64)
transmit = make(map[string]map[string]uint64)
f, err := os.Open("/proc/net/dev")
if err != nil {
return nil, nil, err
}
defer f.Close()
reader := bufio.NewReader(f)
header, err := reader.ReadBytes('\n')
if err != nil {
return nil, nil, err
}
if !netDevHeader.Match(header) {
return nil, nil, errNetDev
}
cols, err := reader.ReadString('\n')
if err != nil {
return nil, nil, err
}
colSections := strings.Split(cols, "|")
if len(colSections) != 3 {
return nil, nil, errNetDev
}
receiveColNames := strings.Fields(colSections[1])
transmitColNames := strings.Fields(colSections[2])
for {
line, err := reader.ReadString('\n')
if err != nil {
if err == io.EOF {
if len(receive) == 0 {
return nil, nil, errors.New("no devices")
}
break
}
return nil, nil, err
}
parts := strings.Split(line, ":")
if len(parts) != 2 {
return nil, nil, errNetDev
}
key := string(strings.TrimSpace(parts[0]))
receiveValue := make(map[string]uint64)
transmitValue := make(map[string]uint64)
fields := strings.Fields(parts[1])
if len(fields) != len(receiveColNames)+len(transmitColNames) {
return nil, nil, errNetDev
}
for i, field := range fields {
v, err := strconv.ParseUint(string(field), 10, 64)
if err != nil {
return nil, nil, err
}
if i < len(receiveColNames) {
receiveValue[receiveColNames[i]] = v
} else {
transmitValue[transmitColNames[i-len(receiveColNames)]] = v
}
}
receive[key] = receiveValue
transmit[key] = transmitValue
}
return receive, transmit, nil
}