-
Notifications
You must be signed in to change notification settings - Fork 1
/
fs_storage.go
176 lines (156 loc) · 4.09 KB
/
fs_storage.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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
package raphanus
import (
"bufio"
"encoding/json"
"fmt"
"log"
"os"
"strconv"
"strings"
"time"
"github.com/msoap/raphanus/common"
)
/*
TTL lost after save and load!
File format:
key_name \t type(int|str|list|dict) \t 12|["string"]|[...]|{...}
k1 \t int \t 123 \n
k2 \t str \t ["string value"] \n
k3 \t list \t ["string","value"] \n
k4 \t dict \t {"dk1":"v1","dk2":"v2"} \n
*/
// fsLoad - load cache from file (on start)
func (db *DB) fsLoad() (err error) {
db.Lock()
db.withLock = false // for common lock for save all keys
defer func() {
db.Unlock()
db.withLock = true
}()
file, err := os.Open(db.fsStorageName)
if err != nil {
return err
}
defer func() {
err = file.Close()
}()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
parts := strings.SplitN(line, "\t", 3)
if len(parts) != 3 {
return fmt.Errorf("load from file, file is damaged")
}
switch parts[1] {
case "int":
var intVal int64
intVal, err = strconv.ParseInt(parts[2], 10, 64)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s', parse int: %s", parts[0], err)
}
err = db.SetInt(parts[0], intVal, 0)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s'", parts[0])
}
case "str":
listVal := make(raphanuscommon.ListValue, 0)
err = json.Unmarshal([]byte(parts[2]), &listVal)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s', parse string: %s", parts[0], err)
}
if len(listVal) != 1 {
return fmt.Errorf("load from file, file is damaged, key: '%s', parse string", parts[0])
}
strVal := listVal[0]
err = db.SetStr(parts[0], strVal, 0)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s'", parts[0])
}
case "list":
listVal := make(raphanuscommon.ListValue, 0)
err = json.Unmarshal([]byte(parts[2]), &listVal)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s', parse list: %s", parts[0], err)
}
err = db.SetList(parts[0], listVal, 0)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s'", parts[0])
}
case "dict":
dictVal := make(raphanuscommon.DictValue)
err = json.Unmarshal([]byte(parts[2]), &dictVal)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s', parse dict: %s", parts[0], err)
}
err = db.SetDict(parts[0], dictVal, 0)
if err != nil {
return fmt.Errorf("load from file, file is damaged, key: '%s'", parts[0])
}
default:
return fmt.Errorf("load from file, file is damaged, key: '%s', unknown type: %s", parts[0], parts[1])
}
}
return scanner.Err()
}
// fsSave - save cache to file
func (db *DB) fsSave() (err error) {
db.RLock()
defer db.RUnlock()
file, err := os.Create(db.fsStorageName)
if err != nil {
return err
}
defer func() {
err = file.Close()
}()
for key, rawValue := range db.data {
row := make([]string, 3)
row[0] = key
switch value := rawValue.(type) {
case int64:
row[1] = "int"
row[2] = strconv.FormatInt(value, 10)
case string:
row[1] = "str"
valueAsArr := []string{value}
byteVal, err := json.Marshal(valueAsArr)
if err != nil {
return err
}
row[2] = string(byteVal)
case raphanuscommon.ListValue:
row[1] = "list"
byteVal, err := json.Marshal(value)
if err != nil {
return err
}
row[2] = string(byteVal)
case raphanuscommon.DictValue:
row[1] = "dict"
byteVal, err := json.Marshal(value)
if err != nil {
return err
}
row[2] = string(byteVal)
default:
return fmt.Errorf("save from file, unknown type for key: '%s'", key)
}
line := strings.Join(row, "\t") + "\n"
_, err := file.WriteString(line)
if err != nil {
return fmt.Errorf("save from file, save row for key: '%s': %s", key, err)
}
}
return nil
}
// fsHandle - handle periodic save on disk
func (db *DB) fsHandle() {
for {
time.Sleep(time.Duration(db.fsStorageSyncTime) * time.Second)
err := db.fsSave()
if err != nil {
// TODO: add option for logging
log.Printf("Save to file failed: %s", err)
}
}
}