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Add powerdns input plugin 

closes #614
This commit is contained in:
Pavel Yudin 2016-01-29 17:53:50 +03:00 committed by Cameron Sparr
parent 9e7c8df384
commit 40d859354f
6 changed files with 344 additions and 0 deletions
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1
CHANGELOG.md
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@ -7,6 +7,7 @@
- [#564](https://github.com/influxdata/telegraf/issues/564): features for plugin writing simplification. Internal metric data type.
- [#603](https://github.com/influxdata/telegraf/pull/603): Aggregate statsd timing measurements into fields. Thanks @marcinbunsch!
- [#601](https://github.com/influxdata/telegraf/issues/601): Warn when overwriting cached metrics.
- [#614](https://github.com/influxdata/telegraf/pull/614): PowerDNS input plugin. Thanks @Kasen!
### Bugfixes
- [#595](https://github.com/influxdata/telegraf/issues/595): graphite output should include tags to separate duplicate measurements.

1
README.md
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@ -165,6 +165,7 @@ Currently implemented sources:
* phusion passenger
* ping
* postgresql
* powerdns
* procstat
* prometheus
* puppetagent

1
plugins/inputs/all/all.go
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@ -26,6 +26,7 @@ import (
_ "github.com/influxdata/telegraf/plugins/inputs/phpfpm"
_ "github.com/influxdata/telegraf/plugins/inputs/ping"
_ "github.com/influxdata/telegraf/plugins/inputs/postgresql"
_ "github.com/influxdata/telegraf/plugins/inputs/powerdns"
_ "github.com/influxdata/telegraf/plugins/inputs/procstat"
_ "github.com/influxdata/telegraf/plugins/inputs/prometheus"
_ "github.com/influxdata/telegraf/plugins/inputs/puppetagent"

68
plugins/inputs/powerdns/README.md Normal file
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@ -0,0 +1,68 @@
# PowerDNS Input Plugin
The powerdns plugin gathers metrics about PowerDNS using unix socket.
### Configuration:
```
# Description
[[inputs.powerdns]]
# An array of sockets to gather stats about.
# Specify a path to unix socket.
#
# If no servers are specified, then '/var/run/pdns.controlsocket' is used as the path.
unix_sockets = ["/var/run/pdns.controlsocket"]
```
### Measurements & Fields:
- powerdns
- corrupt-packets
- deferred-cache-inserts
- deferred-cache-lookup
- dnsupdate-answers
- dnsupdate-changes
- dnsupdate-queries
- dnsupdate-refused
- packetcache-hit
- packetcache-miss
- packetcache-size
- query-cache-hit
- query-cache-miss
- rd-queries
- recursing-answers
- recursing-questions
- recursion-unanswered
- security-status
- servfail-packets
- signatures
- tcp-answers
- tcp-queries
- timedout-packets
- udp-answers
- udp-answers-bytes
- udp-do-queries
- udp-queries
- udp4-answers
- udp4-queries
- udp6-answers
- udp6-queries
- key-cache-size
- latency
- meta-cache-size
- qsize-q
- signature-cache-size
- sys-msec
- uptime
- user-msec
### Tags:
- tags: `server=socket`
### Example Output:
```
$ ./telegraf -config telegraf.conf -input-filter powerdns -test
> powerdns,server=/var/run/pdns.controlsocket corrupt-packets=0i,deferred-cache-inserts=0i,deferred-cache-lookup=0i,dnsupdate-answers=0i,dnsupdate-changes=0i,dnsupdate-queries=0i,dnsupdate-refused=0i,key-cache-size=0i,latency=26i,meta-cache-size=0i,packetcache-hit=0i,packetcache-miss=1i,packetcache-size=0i,qsize-q=0i,query-cache-hit=0i,query-cache-miss=6i,rd-queries=1i,recursing-answers=0i,recursing-questions=0i,recursion-unanswered=0i,security-status=3i,servfail-packets=0i,signature-cache-size=0i,signatures=0i,sys-msec=4349i,tcp-answers=0i,tcp-queries=0i,timedout-packets=0i,udp-answers=1i,udp-answers-bytes=50i,udp-do-queries=0i,udp-queries=0i,udp4-answers=1i,udp4-queries=1i,udp6-answers=0i,udp6-queries=0i,uptime=166738i,user-msec=3036i 1454078624932715706
```

126
plugins/inputs/powerdns/powerdns.go Normal file
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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
}
var sampleConfig = `
# An array of sockets to gather stats about.
# Specify a path to unix socket.
#
# If no servers are specified, then '/var/run/pdns.controlsocket' is used as the path.
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 {
return 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()
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(conn, "show * \n"); err != nil {
return nil
}
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, err := parseResponse(metrics)
if err != nil {
return err
}
// Add server socket as a tag
tags := map[string]string{"server": address}
acc.AddFields("powerdns", fields, tags)
return nil
}
func parseResponse(metrics string) (map[string]interface{}, error) {
values := make(map[string]interface{})
s := strings.Split(metrics, ",")
for _, metric := range s[:len(s)-1] {
m := strings.Split(metric, "=")
i, err := strconv.ParseInt(m[1], 10, 64)
if err != nil {
return values, err
}
values[m[0]] = i
}
return values, nil
}
func init() {
inputs.Add("powerdns", func() telegraf.Input {
return &Powerdns{}
})
}

147
plugins/inputs/powerdns/powerdns_test.go Normal file
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package powerdns
import (
"crypto/rand"
"encoding/binary"
"fmt"
"net"
"testing"
"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type statServer struct{}
var metrics = "corrupt-packets=0,deferred-cache-inserts=0,deferred-cache-lookup=0," +
"dnsupdate-answers=0,dnsupdate-changes=0,dnsupdate-queries=0," +
"dnsupdate-refused=0,packetcache-hit=0,packetcache-miss=1,packetcache-size=0," +
"query-cache-hit=0,query-cache-miss=6,rd-queries=1,recursing-answers=0," +
"recursing-questions=0,recursion-unanswered=0,security-status=3," +
"servfail-packets=0,signatures=0,tcp-answers=0,tcp-queries=0," +
"timedout-packets=0,udp-answers=1,udp-answers-bytes=50,udp-do-queries=0," +
"udp-queries=0,udp4-answers=1,udp4-queries=1,udp6-answers=0,udp6-queries=0," +
"key-cache-size=0,latency=26,meta-cache-size=0,qsize-q=0," +
"signature-cache-size=0,sys-msec=2889,uptime=86317,user-msec=2167,"
func (s statServer) serverSocket(l net.Listener) {
for {
conn, err := l.Accept()
if err != nil {
return
}
go func(c net.Conn) {
buf := make([]byte, 1024)
n, _ := c.Read(buf)
data := buf[:n]
if string(data) == "show * \n" {
c.Write([]byte(metrics))
c.Close()
}
}(conn)
}
}
func TestMemcachedGeneratesMetrics(t *testing.T) {
// We create a fake server to return test data
var randomNumber int64
binary.Read(rand.Reader, binary.LittleEndian, &randomNumber)
socket, err := net.Listen("unix", fmt.Sprintf("/tmp/pdns%d.controlsocket", randomNumber))
if err != nil {
t.Fatal("Cannot initalize server on port ")
}
defer socket.Close()
s := statServer{}
go s.serverSocket(socket)
p := &Powerdns{
UnixSockets: []string{fmt.Sprintf("/tmp/pdns%d.controlsocket", randomNumber)},
}
var acc testutil.Accumulator
err = p.Gather(&acc)
require.NoError(t, err)
intMetrics := []string{"corrupt-packets", "deferred-cache-inserts",
"deferred-cache-lookup", "dnsupdate-answers", "dnsupdate-changes",
"dnsupdate-queries", "dnsupdate-refused", "packetcache-hit",
"packetcache-miss", "packetcache-size", "query-cache-hit", "query-cache-miss",
"rd-queries", "recursing-answers", "recursing-questions",
"recursion-unanswered", "security-status", "servfail-packets", "signatures",
"tcp-answers", "tcp-queries", "timedout-packets", "udp-answers",
"udp-answers-bytes", "udp-do-queries", "udp-queries", "udp4-answers",
"udp4-queries", "udp6-answers", "udp6-queries", "key-cache-size", "latency",
"meta-cache-size", "qsize-q", "signature-cache-size", "sys-msec", "uptime", "user-msec"}
for _, metric := range intMetrics {
assert.True(t, acc.HasIntField("powerdns", metric), metric)
}
}
func TestPowerdnsParseMetrics(t *testing.T) {
values, err := parseResponse(metrics)
require.NoError(t, err, "Error parsing memcached response")
tests := []struct {
key string
value int64
}{
{"corrupt-packets", 0},
{"deferred-cache-inserts", 0},
{"deferred-cache-lookup", 0},
{"dnsupdate-answers", 0},
{"dnsupdate-changes", 0},
{"dnsupdate-queries", 0},
{"dnsupdate-refused", 0},
{"packetcache-hit", 0},
{"packetcache-miss", 1},
{"packetcache-size", 0},
{"query-cache-hit", 0},
{"query-cache-miss", 6},
{"rd-queries", 1},
{"recursing-answers", 0},
{"recursing-questions", 0},
{"recursion-unanswered", 0},
{"security-status", 3},
{"servfail-packets", 0},
{"signatures", 0},
{"tcp-answers", 0},
{"tcp-queries", 0},
{"timedout-packets", 0},
{"udp-answers", 1},
{"udp-answers-bytes", 50},
{"udp-do-queries", 0},
{"udp-queries", 0},
{"udp4-answers", 1},
{"udp4-queries", 1},
{"udp6-answers", 0},
{"udp6-queries", 0},
{"key-cache-size", 0},
{"latency", 26},
{"meta-cache-size", 0},
{"qsize-q", 0},
{"signature-cache-size", 0},
{"sys-msec", 2889},
{"uptime", 86317},
{"user-msec", 2167},
}
for _, test := range tests {
value, ok := values[test.key]
if !ok {
t.Errorf("Did not find key for metric %s in values", test.key)
continue
}
if value != test.value {
t.Errorf("Metric: %s, Expected: %d, actual: %d",
test.key, test.value, value)
}
}
}