-
Notifications
You must be signed in to change notification settings - Fork 1
/
index.js
151 lines (124 loc) · 3.46 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
145
146
147
148
149
150
151
const Store = (db, loc) => {
const tx = db.transaction(loc, 'readwrite')
return { tx, store: tx.objectStore(loc) }
}
const getRange = (o) => {
const exLower = typeof o.lt !== 'undefined'
const exUpper = typeof o.gt !== 'undefined'
const range = window.IDBKeyRange
if ((o.lte || o.lt) && (o.gte && o.gt)) {
const args = [
o.lte || o.lt,
o.gte || o.gt,
exLower,
exUpper
]
return range.bound(...args)
}
if (o.lte || o.lt) {
return range.lowerBound(o.lte || o.lt, exLower)
}
if (o.gte || o.gt) {
return range.upperBound(o.gte || o.gt, exUpper)
}
}
module.exports = class Indexed {
constructor (loc) {
this._loc = loc
this._db = null
}
then (resolve) {
const r = window.indexedDB.open(this._loc)
const loc = this._loc
r.onerror = event => {
resolve({ err: event.target })
}
r.onupgradeneeded = (event) => {
this._db = event.target.result
const opts = { keyPath: 'key' }
const store = this._db.createObjectStore(loc, opts)
store.transaction.oncomplete = event => {
resolve({ db: this })
}
}
r.onsuccess = (event) => {
this._db = event.target.result
resolve({ db: this })
}
}
get (key) {
return new Promise(resolve => {
const { store } = Store(this._db, this._loc)
const r = store.get(key)
r.onerror = event => resolve({ err: event.target })
r.onsuccess = function (event) {
resolve({ data: this.result })
}
})
}
put (key, value) {
return new Promise(resolve => {
const { store } = Store(this._db, this._loc)
const r = store.put({ key, value })
r.onerror = event => resolve({ err: event.target })
r.onsuccess = event => resolve({})
})
}
del (key) {
return new Promise(resolve => {
const { store } = Store(this._db, this._loc)
const r = store.delete(key)
r.onerror = event => resolve({ err: event.target })
r.onsuccess = event => resolve({})
})
}
batch (ops) {
return new Promise(resolve => {
const { tx, store } = Store(this._db, this._loc)
tx.onerror = event => resolve({ err: event.target })
tx.oncomplete = event => resolve({})
const eachOp = op => {
if (op.type === 'put') {
store.put({ key: op.key, value: op.value })
}
if (op.type === 'del') {
store.delete(op.key)
}
}
ops.forEach(eachOp)
})
}
read (opts = {}) {
return new Promise(resolve => {
const { store } = Store(this._db, this._loc)
const r = store.openCursor(getRange(opts))
const events = {}
let count = 0
resolve({ events })
function onError (event) {
if (events.onerror) events.onerror(event.target)
}
async function onSuccess (event) {
const cursor = event.target.result
if (cursor) {
const r = store.get(this.result.key)
r.onerror = event => {
if (events.onerror) events.onerror(event.target)
}
r.onsuccess = function (event) {
if (events.ondata) events.ondata(this.result)
if (opts.limit && (count++ === (opts.limit - 1))) {
if (events.onend) return events.onend()
return
}
cursor.continue()
}
} else {
if (events.onend) events.onend()
}
}
r.onerror = onError
r.onsuccess = onSuccess
})
}
}