mirror of
https://github.com/prometheus/node_exporter.git
synced 2025-08-20 18:33:52 -07:00
refactor: Use netlink for tcpstat collector
Signed-off-by: Tim Windelschmidt <t.windelschmidt@babiel.com>
This commit is contained in:
Fionera
Tim Windelschmidt
parent
3d9ee5d9cc
commit
9ece38fca9
|
|
@ -1,3 +0,0 @@
|
|||
sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode
|
||||
0: 00000000:0016 00000000:0000 0A 00000015:00000000 00:00000000 00000000 0 0 2740 1 ffff88003d3af3c0 100 0 0 10 0
|
||||
1: 0F02000A:0016 0202000A:8B6B 01 00000015:00000001 02:000AC99B 00000000 0 0 3652 4 ffff88003d3ae040 21 4 31 47 46
|
||||
|
|
@ -18,13 +18,12 @@ package collector
|
|||
|
||||
import (
|
||||
"fmt"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"strconv"
|
||||
"strings"
|
||||
"syscall"
|
||||
"unsafe"
|
||||
|
||||
"github.com/go-kit/log"
|
||||
"github.com/mdlayher/netlink"
|
||||
"github.com/prometheus/client_golang/prometheus"
|
||||
)
|
||||
|
||||
|
|
@ -80,16 +79,64 @@ func NewTCPStatCollector(logger log.Logger) (Collector, error) {
|
|||
}, nil
|
||||
}
|
||||
|
||||
// InetDiagSockID (inet_diag_sockid) contains the socket identity.
|
||||
// https://github.com/torvalds/linux/blob/v4.0/include/uapi/linux/inet_diag.h#L13
|
||||
type InetDiagSockID struct {
|
||||
SourcePort [2]byte
|
||||
DestPort [2]byte
|
||||
SourceIP [4][4]byte
|
||||
DestIP [4][4]byte
|
||||
Interface uint32
|
||||
Cookie [2]uint32
|
||||
}
|
||||
|
||||
// InetDiagReqV2 (inet_diag_req_v2) is used to request diagnostic data.
|
||||
// https://github.com/torvalds/linux/blob/v4.0/include/uapi/linux/inet_diag.h#L37
|
||||
type InetDiagReqV2 struct {
|
||||
Family uint8
|
||||
Protocol uint8
|
||||
Ext uint8
|
||||
Pad uint8
|
||||
States uint32
|
||||
ID InetDiagSockID
|
||||
}
|
||||
|
||||
const sizeOfDiagRequest = 0x38
|
||||
|
||||
func (req *InetDiagReqV2) Serialize() []byte {
|
||||
return (*(*[sizeOfDiagRequest]byte)(unsafe.Pointer(req)))[:]
|
||||
}
|
||||
|
||||
func (req *InetDiagReqV2) Len() int {
|
||||
return sizeOfDiagRequest
|
||||
}
|
||||
|
||||
type InetDiagMsg struct {
|
||||
Family uint8
|
||||
State uint8
|
||||
Timer uint8
|
||||
Retrans uint8
|
||||
ID InetDiagSockID
|
||||
Expires uint32
|
||||
RQueue uint32
|
||||
WQueue uint32
|
||||
UID uint32
|
||||
Inode uint32
|
||||
}
|
||||
|
||||
func parseInetDiagMsg(b []byte) *InetDiagMsg {
|
||||
return (*InetDiagMsg)(unsafe.Pointer(&b[0]))
|
||||
}
|
||||
|
||||
func (c *tcpStatCollector) Update(ch chan<- prometheus.Metric) error {
|
||||
tcpStats, err := getTCPStats(procFilePath("net/tcp"))
|
||||
tcpStats, err := getTCPStats(syscall.AF_INET)
|
||||
if err != nil {
|
||||
return fmt.Errorf("couldn't get tcpstats: %w", err)
|
||||
}
|
||||
|
||||
// if enabled ipv6 system
|
||||
tcp6File := procFilePath("net/tcp6")
|
||||
if _, hasIPv6 := os.Stat(tcp6File); hasIPv6 == nil {
|
||||
tcp6Stats, err := getTCPStats(tcp6File)
|
||||
if _, hasIPv6 := os.Stat(procFilePath("net/tcp6")); hasIPv6 == nil {
|
||||
tcp6Stats, err := getTCPStats(syscall.AF_INET6)
|
||||
if err != nil {
|
||||
return fmt.Errorf("couldn't get tcp6stats: %w", err)
|
||||
}
|
||||
|
|
@ -102,59 +149,51 @@ func (c *tcpStatCollector) Update(ch chan<- prometheus.Metric) error {
|
|||
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)
|
||||
func getTCPStats(family uint8) (map[tcpConnectionState]float64, error) {
|
||||
const TCPFAll = 0xFFF
|
||||
const InetDiagInfo = 2
|
||||
const SockDiagByFamily = 20
|
||||
|
||||
conn, err := netlink.Dial(syscall.NETLINK_INET_DIAG, nil)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("couldn't connect netlink: %w", err)
|
||||
}
|
||||
defer conn.Close()
|
||||
|
||||
msg := netlink.Message{
|
||||
Header: netlink.Header{
|
||||
Type: SockDiagByFamily,
|
||||
Flags: syscall.NLM_F_REQUEST | syscall.NLM_F_DUMP,
|
||||
},
|
||||
Data: (&InetDiagReqV2{
|
||||
Family: family,
|
||||
Protocol: syscall.IPPROTO_TCP,
|
||||
States: TCPFAll,
|
||||
Ext: 0 | 1<<(InetDiagInfo-1),
|
||||
}).Serialize(),
|
||||
}
|
||||
|
||||
messages, err := conn.Execute(msg)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer file.Close()
|
||||
|
||||
return parseTCPStats(file)
|
||||
return parseTCPStats(messages)
|
||||
}
|
||||
|
||||
func parseTCPStats(r io.Reader) (map[tcpConnectionState]float64, error) {
|
||||
func parseTCPStats(msgs []netlink.Message) (map[tcpConnectionState]float64, error) {
|
||||
tcpStats := map[tcpConnectionState]float64{}
|
||||
contents, err := ioutil.ReadAll(r)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
for _, line := range strings.Split(string(contents), "\n")[1:] {
|
||||
parts := strings.Fields(line)
|
||||
if len(parts) == 0 {
|
||||
continue
|
||||
}
|
||||
if len(parts) < 5 {
|
||||
return nil, fmt.Errorf("invalid TCP stats line: %q", line)
|
||||
}
|
||||
|
||||
qu := strings.Split(parts[4], ":")
|
||||
if len(qu) < 2 {
|
||||
return nil, fmt.Errorf("cannot parse tx_queues and rx_queues: %q", line)
|
||||
}
|
||||
|
||||
tx, err := strconv.ParseUint(qu[0], 16, 64)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
tcpStats[tcpConnectionState(tcpTxQueuedBytes)] += float64(tx)
|
||||
|
||||
rx, err := strconv.ParseUint(qu[1], 16, 64)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
tcpStats[tcpConnectionState(tcpRxQueuedBytes)] += float64(rx)
|
||||
|
||||
st, err := strconv.ParseInt(parts[3], 16, 8)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
tcpStats[tcpConnectionState(st)]++
|
||||
for _, m := range msgs {
|
||||
msg := parseInetDiagMsg(m.Data)
|
||||
|
||||
tcpStats[tcpTxQueuedBytes] += float64(msg.WQueue)
|
||||
tcpStats[tcpRxQueuedBytes] += float64(msg.RQueue)
|
||||
tcpStats[tcpConnectionState(msg.State)]++
|
||||
}
|
||||
|
||||
return tcpStats, nil
|
||||
|
|
|
|||
|
|
@ -14,66 +14,56 @@
|
|||
package collector
|
||||
|
||||
import (
|
||||
"os"
|
||||
"strings"
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"syscall"
|
||||
"testing"
|
||||
|
||||
"github.com/mdlayher/netlink"
|
||||
)
|
||||
|
||||
func Test_parseTCPStatsError(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
in string
|
||||
}{
|
||||
{
|
||||
name: "too few fields",
|
||||
in: "sl local_address\n 0: 00000000:0016",
|
||||
},
|
||||
{
|
||||
name: "missing colon in tx-rx field",
|
||||
in: "sl local_address rem_address st tx_queue rx_queue\n" +
|
||||
" 1: 0F02000A:0016 0202000A:8B6B 01 0000000000000001",
|
||||
},
|
||||
{
|
||||
name: "tx parsing issue",
|
||||
in: "sl local_address rem_address st tx_queue rx_queue\n" +
|
||||
" 1: 0F02000A:0016 0202000A:8B6B 01 0000000x:00000001",
|
||||
},
|
||||
{
|
||||
name: "rx parsing issue",
|
||||
in: "sl local_address rem_address st tx_queue rx_queue\n" +
|
||||
" 1: 0F02000A:0016 0202000A:8B6B 01 00000000:0000000x",
|
||||
},
|
||||
{
|
||||
name: "state parsing issue",
|
||||
in: "sl local_address rem_address st tx_queue rx_queue\n" +
|
||||
" 1: 0F02000A:0016 0202000A:8B6B 0H 00000000:00000001",
|
||||
},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
if _, err := parseTCPStats(strings.NewReader(tt.in)); err == nil {
|
||||
t.Fatal("expected an error, but none occurred")
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
func TestTCPStat(t *testing.T) {
|
||||
|
||||
noFile, _ := os.Open("follow the white rabbit")
|
||||
defer noFile.Close()
|
||||
|
||||
if _, err := parseTCPStats(noFile); err == nil {
|
||||
t.Fatal("expected an error, but none occurred")
|
||||
func Test_parseTCPStats(t *testing.T) {
|
||||
encode := func(m InetDiagMsg) []byte {
|
||||
var buf bytes.Buffer
|
||||
err := binary.Write(&buf, binary.LittleEndian, m)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
return buf.Bytes()
|
||||
}
|
||||
|
||||
file, err := os.Open("fixtures/proc/net/tcpstat")
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
msg := []netlink.Message{
|
||||
{
|
||||
Data: encode(InetDiagMsg{
|
||||
Family: syscall.AF_INET,
|
||||
State: uint8(tcpEstablished),
|
||||
Timer: 0,
|
||||
Retrans: 0,
|
||||
ID: InetDiagSockID{},
|
||||
Expires: 0,
|
||||
RQueue: 11,
|
||||
WQueue: 21,
|
||||
UID: 0,
|
||||
Inode: 0,
|
||||
}),
|
||||
},
|
||||
{
|
||||
Data: encode(InetDiagMsg{
|
||||
Family: syscall.AF_INET,
|
||||
State: uint8(tcpListen),
|
||||
Timer: 0,
|
||||
Retrans: 0,
|
||||
ID: InetDiagSockID{},
|
||||
Expires: 0,
|
||||
RQueue: 11,
|
||||
WQueue: 21,
|
||||
UID: 0,
|
||||
Inode: 0,
|
||||
}),
|
||||
},
|
||||
}
|
||||
defer file.Close()
|
||||
|
||||
tcpStats, err := parseTCPStats(file)
|
||||
tcpStats, err := parseTCPStats(msg)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
|
@ -89,35 +79,8 @@ func TestTCPStat(t *testing.T) {
|
|||
if want, got := 42, int(tcpStats[tcpTxQueuedBytes]); want != got {
|
||||
t.Errorf("want tcpstat number of bytes in tx queue %d, got %d", want, got)
|
||||
}
|
||||
if want, got := 1, int(tcpStats[tcpRxQueuedBytes]); want != got {
|
||||
if want, got := 22, int(tcpStats[tcpRxQueuedBytes]); want != got {
|
||||
t.Errorf("want tcpstat number of bytes in rx queue %d, got %d", want, got)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func Test_getTCPStats(t *testing.T) {
|
||||
type args struct {
|
||||
statsFile string
|
||||
}
|
||||
tests := []struct {
|
||||
name string
|
||||
args args
|
||||
wantErr bool
|
||||
}{
|
||||
{
|
||||
name: "file not found",
|
||||
args: args{statsFile: "somewhere over the rainbow"},
|
||||
wantErr: true,
|
||||
},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
_, err := getTCPStats(tt.args.statsFile)
|
||||
if (err != nil) != tt.wantErr {
|
||||
t.Errorf("getTCPStats() error = %v, wantErr %v", err, tt.wantErr)
|
||||
return
|
||||
}
|
||||
// other cases are covered by TestTCPStat()
|
||||
})
|
||||
}
|
||||
}
|
||||
|
|
|
|||
1
go.mod
1
go.mod
|
|
@ -12,6 +12,7 @@ require (
|
|||
github.com/jsimonetti/rtnetlink v1.1.1
|
||||
github.com/lufia/iostat v1.2.1
|
||||
github.com/mattn/go-xmlrpc v0.0.3
|
||||
github.com/mdlayher/netlink v1.6.0
|
||||
github.com/mdlayher/wifi v0.0.0-20220320220353-954ff73a19a5
|
||||
github.com/prometheus/client_golang v1.12.1
|
||||
github.com/prometheus/client_model v0.2.0
|
||||
|
|
|
|||
Loading…
Reference in a new issue