-
Notifications
You must be signed in to change notification settings - Fork 13
/
powerdns.go
131 lines (102 loc) · 2.53 KB
/
powerdns.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
package powerdns
import (
"bufio"
"context"
"errors"
"fmt"
"io"
"log"
"net"
"strconv"
"strings"
"time"
"github.com/circonus-labs/circonus-unified-agent/cua"
"github.com/circonus-labs/circonus-unified-agent/plugins/inputs"
)
type Powerdns struct {
UnixSockets []string
}
var sampleConfig = `
instance_id = "" # unique instance identifier (REQUIRED)
## 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(ctx context.Context, acc cua.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 cua.Accumulator) error {
conn, err := net.DialTimeout("unix", address, defaultTimeout)
if err != nil {
return fmt.Errorf("set dial timeout: %w", 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 fmt.Errorf("flush: %w", err)
}
// Read data
buf := make([]byte, 0, 4096)
tmp := make([]byte, 1024)
for {
n, err := rw.Read(tmp)
if err != nil {
if !errors.Is(err, io.EOF) {
return fmt.Errorf("read: %w", err)
}
break
}
buf = append(buf, tmp[:n]...)
}
metrics := string(buf)
// Process data
fields := parseResponse(metrics)
// 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{} {
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 {
log.Printf("E! [inputs.powerdns] error parsing integer for metric %q: %s",
metric, err.Error())
continue
}
values[m[0]] = i
}
return values
}
func init() {
inputs.Add("powerdns", func() cua.Input {
return &Powerdns{}
})
}