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powerdns.go
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powerdns.go
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package powerdns
import (
"bufio"
"fmt"
"io"
"net"
"strconv"
"strings"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
type Powerdns struct {
UnixSockets []string
Log telegraf.Logger `toml:"-"`
}
var sampleConfig = `
## An array of sockets to gather stats about.
## Specify a path to unix socket.
unix_sockets = ["/var/run/pdns.controlsocket"]
`
var defaultTimeout = 5 * time.Second
func (p *Powerdns) SampleConfig() string {
return sampleConfig
}
func (p *Powerdns) Description() string {
return "Read metrics from one or many PowerDNS servers"
}
func (p *Powerdns) Gather(acc telegraf.Accumulator) error {
if len(p.UnixSockets) == 0 {
return p.gatherServer("/var/run/pdns.controlsocket", acc)
}
for _, serverSocket := range p.UnixSockets {
if err := p.gatherServer(serverSocket, acc); err != nil {
acc.AddError(err)
}
}
return nil
}
func (p *Powerdns) gatherServer(address string, acc telegraf.Accumulator) error {
conn, err := net.DialTimeout("unix", address, defaultTimeout)
if err != nil {
return err
}
defer conn.Close()
if err := conn.SetDeadline(time.Now().Add(defaultTimeout)); err != nil {
return err
}
// Read and write buffer
rw := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
// Send command
if _, err := fmt.Fprint(conn, "show * \n"); err != nil {
return err
}
if err := rw.Flush(); err != nil {
return err
}
// Read data
buf := make([]byte, 0, 4096)
tmp := make([]byte, 1024)
for {
n, err := rw.Read(tmp)
if err != nil {
if err != io.EOF {
return err
}
break
}
buf = append(buf, tmp[:n]...)
}
metrics := string(buf)
// Process data
fields := p.parseResponse(metrics)
// Add server socket as a tag
tags := map[string]string{"server": address}
acc.AddFields("powerdns", fields, tags)
return nil
}
func (p *Powerdns) parseResponse(metrics string) map[string]interface{} {
values := make(map[string]interface{})
s := strings.Split(metrics, ",")
for _, metric := range s[:len(s)-1] {
m := strings.Split(metric, "=")
if len(m) < 2 {
continue
}
i, err := strconv.ParseInt(m[1], 10, 64)
if err != nil {
p.Log.Errorf("error parsing integer for metric %q: %s", metric, err.Error())
continue
}
values[m[0]] = i
}
return values
}
func init() {
inputs.Add("powerdns", func() telegraf.Input {
return &Powerdns{}
})
}