-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.js
197 lines (166 loc) · 5.17 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
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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
var util = require('util');
var AbstractLevelDOWN = require('abstract-leveldown').AbstractLevelDOWN;
var AbstractIterator = require('abstract-leveldown').AbstractIterator;
var setImmediate = global.setImmediate || process.nextTick;
var bops = require('bops');
var azure = require('azure');
var noop = function(){};
function AzureIterator (db, options) {
AbstractIterator.call(this, db)
this._reverse = options.reverse
this._limit = options.limit
this._count = 0
this._end = options.end
this._start = options.start
this._gt = options.gt
this._gte = options.gte
this._lt = options.lt
this._lte = options.lte
this.query = azure.TableQuery.select().from(db.config.table).where("PartitionKey eq ?", db.config.partitionKey);
if (this._limit > 0){
this.query = this.query.top(this._limit);
}
if (this._start){
this.query = this.query.and("RowKey ge ?", this._start);
}
if (this._end){
this.query = this.query.and("RowKey le ?", this._end);
}
if (this._reverse){
throw new Error("Reverse is not supported");
}
this.index = 0;
}
util.inherits(AzureIterator, AbstractIterator)
AzureIterator.prototype._next = function (callback) {
var self = this;
var returnResult = function(){
if (self.index < self.results.length){
var entity = self.results[self.index];
self.index = self.index + 1;
setImmediate(function () { callback(null, entity.RowKey, entity.value) })
} else {
nextPage();
}
}
var pageCallback = function(err, data, meta){
if (err || data === null || data.length === 0) {
callback(err);
return;
}
self.continuationToken = meta.continuationToken;
self.results = data;
self.index = 0;
returnResult();
}
var nextPage = function(){
if (self.continuationToken){
self.continuationToken.getNextPage(pageCallback)
} else {
setImmediate(callback);
}
}
if (self.results){
returnResult();
return;
} else {
self.db.tableService.queryEntities(self.query, pageCallback);
}
}
// location is a connection string
function AzureDown (location, settingsOverride) {
if (!(this instanceof AzureDown)){
return new AzureDown(location);
}
if (!location){
throw new Error("constructor requires at least a location argument");
}
this.tableService = azure.createTableService(location);
var settings = {
table: "azureleveldown",
partitionKey: "partition1"
}
if (!settingsOverride){
settingsOverride = {};
}
for (var key in settings){
settings[key] = settingsOverride[key] || settings[key];
}
this.config = settings;
AbstractLevelDOWN.call(this, typeof location == 'string' ? location : '')
}
util.inherits(AzureDown, AbstractLevelDOWN)
AzureDown.prototype._open = function (options, callback) {
var self = this
this.tableService.createTableIfNotExists(this.config.table, options, function(err){
if (callback){
callback(err, self);
}
});
}
AzureDown.prototype._put = function (key, value, options, callback) {
var entity = {
PartitionKey: this.config.partitionKey,
RowKey: key,
value: value
}
if (options.createIfMissing){
this.tableService.insertOrReplaceEntity(this.config.table, entity, options, callback);
} else {
this.tableService.updateEntity(this.config.table, entity, options, callback);
}
}
AzureDown.prototype._get = function (key, options, callback) {
this.tableService.queryEntity(this.config.table, this.config.partitionKey, key, options, function(err, data){
if (data === null || data.value === null){
callback(new Error('NotFound'));
} else {
callback(err, data.value);
}
});
}
AzureDown.prototype._del = function (key, options, callback) {
var entity = {
PartitionKey: this.config.partitionKey,
RowKey: key
}
this.tableService.deleteEntity(this.config.table, entity, options, callback);
}
// TODO, rewrite this to work with azure batch
AzureDown.prototype._batch = function (array, options, callback) {
var err
, key
, value
this.tableService.beginBatch();
if (Array.isArray(array)) {
for (var i = 0; i < array.length; i++) {
if (array[i]) {
key = bops.is(array[i].key) ? array[i].key : String(array[i].key)
err = this._checkKeyValue(key, 'key')
if (err) return setImmediate(function () { callback(err) })
if (array[i].type === 'del') {
// todo, we should be
this._del(array[i].key, options, noop)
} else if (array[i].type === 'put') {
value = bops.is(array[i].value) ? array[i].value : String(array[i].value)
err = this._checkKeyValue(value, 'value')
if (err) return setImmediate(function () { callback(err) })
var entity = {
PartitionKey: this.config.partitionKey,
RowKey: array[i].key,
value: value
}
this.tableService.insertEntity(this.config.table, entity);
}
}
}
}
this.tableService.commitBatch(callback);
}
AzureDown.prototype._iterator = function (options) {
return new AzureIterator(this, options)
}
AzureDown.prototype._isBuffer = function (obj) {
return bops.is(obj)
}
module.exports = AzureDown