/
json.go
105 lines (85 loc) · 2.17 KB
/
json.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
//
// Grafana API json utilities
//
package keeper
import (
"bytes"
"encoding/json"
"hash/crc32"
"os"
)
// prepareDatasourceJSON returns modified json for create
// datasource by Grafana API properly
// field 'id' must be deleted for create
//
func prepareDatasourceJSON(jsonData []byte) ([]byte, error) {
var jsonInterface interface{}
err := json.Unmarshal(jsonData, &jsonInterface)
if err != nil {
return nil, err
}
mapData := jsonInterface.(map[string]interface{})
delete(mapData, "id")
jsonResult, err := json.Marshal(mapData)
if err != nil {
return nil, err
}
return jsonResult, nil
}
// prepareDashboardJSON returns modified json for create
// dashboard by Grafana API properly
// in "dashboard" section top level fields
// 'id' and 'uid' must be set to null
//
func prepareDashboardJSON(jsonData []byte) ([]byte, error) {
var jsonInterface interface{}
err := json.Unmarshal(jsonData, &jsonInterface)
if err != nil {
return nil, err
}
mapData := jsonInterface.(map[string]interface{})
mapData["dashboard"].(map[string]interface{})["id"] = nil
mapData["dashboard"].(map[string]interface{})["uid"] = nil
jsonResult, err := json.Marshal(mapData)
if err != nil {
return nil, err
}
return jsonResult, nil
}
// writeJSONFile rewtites file if it already exists
//
func writeJSONFile(jsonFileName string, jsonData []byte) error {
jsonFile, err := os.Create(jsonFileName)
if err != nil {
return err
}
defer jsonFile.Close()
var buf bytes.Buffer
err = json.Indent(&buf, jsonData, "", "\t")
if err != nil {
return err
}
_, err = jsonFile.Write(buf.Bytes())
if err != nil {
return err
}
return nil
}
// checksum32 returns Crc32 checksum of json
// Grafana time to time return json data in different order
// To fix records order for stable 32-bit checksum
// data is sorting equally by calling Unmarshal/Marshal
//
func checksum32(jsonData []byte) (uint32, error) {
var jsonInterface interface{}
err := json.Unmarshal(jsonData, &jsonInterface)
if err != nil {
return 0, err
}
jsonResult, err := json.Marshal(jsonInterface)
if err != nil {
return 0, err
}
crc32q := crc32.MakeTable(0xD5828281)
return crc32.Checksum(jsonResult, crc32q), nil
}