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
132
133
134
135
136
|
package bind
import (
"encoding/xml"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"path"
"time"
)
// Client queries the BIND API, parses the response and returns stats in a
// generic format.
type Client interface {
Stats(...StatisticGroup) (Statistics, error)
}
// XMLClient is a generic BIND API client to retrieve statistics in XML format.
type XMLClient struct {
url string
http *http.Client
}
// NewXMLClient returns an initialized XMLClient.
func NewXMLClient(url string, c *http.Client) *XMLClient {
return &XMLClient{
url: url,
http: c,
}
}
// Get queries the given path and stores the result in the value pointed to by
// v. The endpoint must return a valid XML representation which can be
// unmarshaled into the provided value.
func (c *XMLClient) Get(p string, v interface{}) error {
u, err := url.Parse(c.url)
if err != nil {
return fmt.Errorf("invalid URL %q: %s", c.url, err)
}
u.Path = path.Join(u.Path, p)
resp, err := c.http.Get(u.String())
if err != nil {
return fmt.Errorf("error querying stats: %s", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("unexpected status %s", resp.Status)
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("failed to read response: %s", err)
}
if err := xml.Unmarshal([]byte(body), v); err != nil {
return fmt.Errorf("failed to unmarshal XML response: %s", err)
}
return nil
}
const (
// QryRTT is the common prefix of query round-trip histogram counters.
QryRTT = "QryRTT"
)
// StatisticGroup describes a sub-group of BIND statistics.
type StatisticGroup string
// Available statistic groups.
const (
ServerStats StatisticGroup = "server"
ViewStats StatisticGroup = "view"
TaskStats StatisticGroup = "tasks"
)
// Statistics is a generic representation of BIND statistics.
type Statistics struct {
Server Server
Views []View
TaskManager TaskManager
}
// Server represents BIND server statistics.
type Server struct {
BootTime time.Time
ConfigTime time.Time
IncomingQueries []Counter
IncomingRequests []Counter
NameServerStats []Counter
}
// View represents statistics for a single BIND view.
type View struct {
Name string
Cache []Gauge
ResolverStats []Counter
ResolverQueries []Counter
}
// TaskManager contains information about all running tasks.
type TaskManager struct {
Tasks []Task `xml:"tasks>task"`
ThreadModel ThreadModel `xml:"thread-model"`
}
// Counter represents a single counter value.
type Counter struct {
Name string `xml:"name,attr"`
Counter uint64 `xml:",chardata"`
}
// Gauge represents a single gauge value.
type Gauge struct {
Name string `xml:"name"`
Gauge int64 `xml:"counter"`
}
// Task represents a single running task.
type Task struct {
ID string `xml:"id"`
Name string `xml:"name"`
Quantum uint64 `xml:"quantum"`
References uint64 `xml:"references"`
State string `xml:"state"`
}
// ThreadModel contains task and worker information.
type ThreadModel struct {
Type string `xml:"type"`
WorkerThreads uint64 `xml:"worker-threads"`
DefaultQuantum uint64 `xml:"default-quantum"`
TasksRunning uint64 `xml:"tasks-running"`
}
|
