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statconn.go
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statconn.go
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package promscrape
import (
"context"
"fmt"
"net"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/netutil"
"github.com/VictoriaMetrics/metrics"
)
func statStdDial(ctx context.Context, _, addr string) (net.Conn, error) {
d := getStdDialer()
network := netutil.GetTCPNetwork()
conn, err := d.DialContext(ctx, network, addr)
dialsTotal.Inc()
if err != nil {
dialErrors.Inc()
if !netutil.TCP6Enabled() && !isTCPv4Addr(addr) {
err = fmt.Errorf("%w; try -enableTCP6 command-line flag if you scrape ipv6 addresses", err)
}
return nil, err
}
conns.Inc()
sc := &statConn{
Conn: conn,
}
return sc, nil
}
func getStdDialer() *net.Dialer {
stdDialerOnce.Do(func() {
stdDialer = &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: netutil.TCP6Enabled(),
}
})
return stdDialer
}
var (
stdDialer *net.Dialer
stdDialerOnce sync.Once
)
var (
dialsTotal = metrics.NewCounter(`vm_promscrape_dials_total`)
dialErrors = metrics.NewCounter(`vm_promscrape_dial_errors_total`)
conns = metrics.NewCounter(`vm_promscrape_conns`)
)
type statConn struct {
closed atomic.Int32
net.Conn
}
func (sc *statConn) Read(p []byte) (int, error) {
n, err := sc.Conn.Read(p)
connReadsTotal.Inc()
if err != nil {
connReadErrors.Inc()
}
connBytesRead.Add(n)
return n, err
}
func (sc *statConn) Write(p []byte) (int, error) {
n, err := sc.Conn.Write(p)
connWritesTotal.Inc()
if err != nil {
connWriteErrors.Inc()
}
connBytesWritten.Add(n)
return n, err
}
func (sc *statConn) Close() error {
err := sc.Conn.Close()
if sc.closed.Add(1) == 1 {
conns.Dec()
}
return err
}
var (
connReadsTotal = metrics.NewCounter(`vm_promscrape_conn_reads_total`)
connWritesTotal = metrics.NewCounter(`vm_promscrape_conn_writes_total`)
connReadErrors = metrics.NewCounter(`vm_promscrape_conn_read_errors_total`)
connWriteErrors = metrics.NewCounter(`vm_promscrape_conn_write_errors_total`)
connBytesRead = metrics.NewCounter(`vm_promscrape_conn_bytes_read_total`)
connBytesWritten = metrics.NewCounter(`vm_promscrape_conn_bytes_written_total`)
)
func isTCPv4Addr(addr string) bool {
s := addr
for i := 0; i < 3; i++ {
n := strings.IndexByte(s, '.')
if n < 0 {
return false
}
if !isUint8NumString(s[:n]) {
return false
}
s = s[n+1:]
}
n := strings.IndexByte(s, ':')
if n < 0 {
return false
}
if !isUint8NumString(s[:n]) {
return false
}
s = s[n+1:]
// Verify TCP port
n, err := strconv.Atoi(s)
if err != nil {
return false
}
return n >= 0 && n < (1<<16)
}
func isUint8NumString(s string) bool {
n, err := strconv.Atoi(s)
if err != nil {
return false
}
return n >= 0 && n < (1<<8)
}