/
json.go
80 lines (67 loc) · 1.54 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
package database
import (
"encoding/json"
"log"
"os"
)
type job struct {
key string
}
type jsonDb struct {
queue chan job
documents map[string]interface{}
}
func createJSONDb() *jsonDb {
db := &jsonDb{
queue: make(chan job),
documents: make(map[string]interface{}),
}
go db.startPersistJob()
return db
}
//Set: Implementation of the database interface
func (jdb *jsonDb) Set(key string, value interface{}) error {
log.Println("(JSON DB): saving data:", value, " for key:", key)
return nil
}
//Get: Implementation of the database interface
func (jdb *jsonDb) Get(key string) (interface{}, error) {
log.Println("(JSON DB): retrieving value from key:", key)
return nil, nil
}
//Observe: Implementation of database interface
func (jdb *jsonDb) Observe(key string) (chan interface{}, error) {
c := make(chan interface{})
return c, nil
}
//Delete: Implementation of the database interface
func (jdb *jsonDb) Delete(key string) error {
log.Println("(JSON DB): deleting value from key:", key)
return nil
}
func (jdb *jsonDb) startPersistJob() {
for {
j := <-jdb.queue
var data struct {
Data interface{} `json:"data"`
}
var f *os.File
if _, err := os.Stat(j.key + ".json"); os.IsNotExist(err) {
f, err = os.Create(j.key + ".json")
if err != nil {
log.Println(err)
}
} else {
f, err = os.Open(j.key + ".json")
if err != nil {
log.Println(err)
}
}
if err := json.NewEncoder(f).Encode(&data); err != nil {
log.Println(err)
}
if err := f.Close(); err != nil {
log.Println(err)
}
}
}