-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathindex.js
144 lines (120 loc) · 3.02 KB
/
index.js
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
const { AbstractLevelDOWN } = require('abstract-leveldown')
const Realm = require('realm')
class RealmDown extends AbstractLevelDOWN {
constructor (opts) {
super()
this.type = 'KeyValueStore'
this.realm = null
this.opts = opts
}
_open (opts, cb) {
Realm.open(Object.assign({}, this.opts, {
schema: [{
name: this.type,
primaryKey: 'key',
properties: { key: 'string', value: 'data' }
}]
}))
.then(realm => {
this.realm = realm
cb(null)
})
.catch(err => cb(err))
}
_get (key, opts, cb) {
if (!this._validateRealm(cb)) {
return null
}
const data = this.realm.objectForPrimaryKey(this.type, key)
if (!data) {
return process.nextTick(cb, new Error('NotFound'))
}
let value = Buffer.from(data.value)
if (opts.asBuffer === false) {
value = value.toString()
}
return process.nextTick(cb, null, value)
}
_put (key, value, opts, cb) {
if (!this._validateRealm(cb)) {
return null
}
try {
this.realm.write(() => {
this.realm.create(this.type, { key, value }, true) // true for update value
})
return process.nextTick(cb, null)
} catch (err) {
return process.nextTick(cb, err)
}
}
_del (key, opts, cb) {
if (!this._validateRealm(cb)) {
return null
}
try {
this.realm.write(() => {
const data = this.realm.objectForPrimaryKey(this.type, key)
this.realm.delete(data)
})
return process.nextTick(cb, null)
} catch (err) {
return process.nextTick(cb, null)
}
}
_batch (operations, opts, cb) {
if (!this._validateRealm(cb)) {
return null
}
try {
this.realm.write(() => {
operations.forEach(operation => {
if (operation.type === 'put') {
this.realm.create(this.type, { key: operation.key, value: operation.value }, true)
} else if (operation.type === 'del') {
const data = this.realm.objectForPrimaryKey(this.type, operation.key)
this.realm.delete(data)
}
})
})
return process.nextTick(cb, null)
} catch (err) {
return process.nextTick(cb, err)
}
}
_close (cb) {
if (!this._validateRealm(cb)) {
return null
}
try {
this.realm.close()
return process.nextTick(cb, null)
} catch (err) {
return process.nextTick(cb, err)
}
}
_validateRealm (cb) {
if (!this.realm) {
process.nextTick(cb, new Error('RealmNotFound'))
return false
}
if (this.realm.isClosed) {
process.nextTick(cb, new Error('RealmClosed'))
return false
}
return true
}
_serializeKey (key) {
return Buffer.isBuffer(key) ? key.toString() : String(key)
}
_serializeValue (value) {
if (value == null) {
return Buffer.from('')
}
if (Buffer.isBuffer(value)) {
return value
}
return Buffer.from(String(value))
}
}
module.exports = (...args) => new RealmDown(...args)