telegraf/plugins/inputs/powerdns_recursor/powerdns_recursor.go

157 lines
3.2 KiB
Go

package powerdns_recursor
import (
"bufio"
"errors"
"fmt"
"log"
"math/rand"
"net"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
type PowerdnsRecursor struct {
UnixSockets []string
SocketDir string `toml:"socket_dir"`
SocketMode uint32 `toml:"socket_mode"`
}
var defaultTimeout = 5 * time.Second
var sampleConfig = `
## An array of sockets to gather stats about.
## Specify a path to unix socket.
unix_sockets = ["/var/run/pdns_recursor.controlsocket"]
## Socket for Receive
#socket_dir = "/var/run/"
## Socket permissions
#socket_mode = "0666"
`
func (p *PowerdnsRecursor) SampleConfig() string {
return sampleConfig
}
func (p *PowerdnsRecursor) Description() string {
return "Read metrics from one or many PowerDNS Recursor servers"
}
func (p *PowerdnsRecursor) Gather(acc telegraf.Accumulator) error {
if len(p.UnixSockets) == 0 {
return p.gatherServer("/var/run/pdns_recursor.controlsocket", acc)
}
for _, serverSocket := range p.UnixSockets {
if err := p.gatherServer(serverSocket, acc); err != nil {
acc.AddError(err)
}
}
return nil
}
func (p *PowerdnsRecursor) gatherServer(address string, acc telegraf.Accumulator) error {
randomNumber := rand.Int63()
recvSocket := filepath.Join("/", "var", "run", fmt.Sprintf("pdns_recursor_telegraf%d", randomNumber))
if p.SocketDir != "" {
recvSocket = filepath.Join(p.SocketDir, fmt.Sprintf("pdns_recursor_telegraf%d", randomNumber))
}
laddr, err := net.ResolveUnixAddr("unixgram", recvSocket)
if err != nil {
return err
}
defer os.Remove(recvSocket)
raddr, err := net.ResolveUnixAddr("unixgram", address)
if err != nil {
return err
}
conn, err := net.DialUnix("unixgram", laddr, raddr)
if err != nil {
return err
}
perm := uint32(0666)
if p.SocketMode > 0 {
perm = p.SocketMode
}
if err := os.Chmod(recvSocket, os.FileMode(perm)); err != nil {
return err
}
defer conn.Close()
conn.SetDeadline(time.Now().Add(defaultTimeout))
// Read and write buffer
rw := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
// Send command
if _, err := fmt.Fprint(rw, "get-all\n"); err != nil {
return nil
}
if err := rw.Flush(); err != nil {
return err
}
// Read data
buf := make([]byte, 16384)
n, err := rw.Read(buf)
if err != nil {
return err
}
if n == 0 {
return errors.New("no data received")
}
metrics := string(buf)
// Process data
fields := parseResponse(metrics)
// Add server socket as a tag
tags := map[string]string{"server": address}
acc.AddFields("powerdns_recursor", fields, tags)
conn.Close()
return nil
}
func parseResponse(metrics string) map[string]interface{} {
values := make(map[string]interface{})
s := strings.Split(metrics, "\n")
for _, metric := range s[:len(s)-1] {
m := strings.Split(metric, "\t")
if len(m) < 2 {
continue
}
i, err := strconv.ParseInt(m[1], 10, 64)
if err != nil {
log.Printf("E! [inputs.powerdns_recursor] Error parsing integer for metric [%s] %v",
metric, err)
continue
}
values[m[0]] = i
}
return values
}
func init() {
inputs.Add("powerdns_recursor", func() telegraf.Input {
return &PowerdnsRecursor{}
})
}