1 | var EventEmitter = require('events').EventEmitter
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2 | var inherits = require('util').inherits
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3 | var extend = require('xtend')
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4 | var DeferredLevelDOWN = require('deferred-leveldown')
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5 | var IteratorStream = require('level-iterator-stream')
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6 | var Batch = require('./batch')
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7 | var errors = require('level-errors')
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8 | var assert = require('assert')
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9 | var promisify = require('./promisify')
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10 |
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11 | var WriteError = errors.WriteError
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12 | var ReadError = errors.ReadError
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13 | var NotFoundError = errors.NotFoundError
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14 | var OpenError = errors.OpenError
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15 | var InitializationError = errors.InitializationError
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16 |
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17 |
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18 |
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19 |
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20 |
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21 |
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22 |
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23 |
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24 |
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25 | function LevelUP (db, options, callback) {
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26 | if (!(this instanceof LevelUP)) {
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27 | return new LevelUP(db, options, callback)
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28 | }
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29 |
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30 | var error
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31 |
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32 | EventEmitter.call(this)
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33 | this.setMaxListeners(Infinity)
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34 |
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35 | if (typeof options === 'function') {
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36 | callback = options
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37 | options = {}
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38 | }
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39 |
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40 | options = options || {}
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41 |
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42 | if (!db || typeof db !== 'object') {
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43 | error = new InitializationError('First argument must be an abstract-leveldown compliant store')
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44 | if (typeof callback === 'function') {
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45 | return process.nextTick(callback, error)
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46 | }
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47 | throw error
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48 | }
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49 |
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50 | assert.equal(typeof db.status, 'string', '.status required, old abstract-leveldown')
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51 |
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52 | this.options = getOptions(options)
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53 | this._db = db
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54 | this.db = new DeferredLevelDOWN(db)
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55 | this.open(callback)
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56 | }
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57 |
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58 | LevelUP.prototype.emit = EventEmitter.prototype.emit
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59 | LevelUP.prototype.once = EventEmitter.prototype.once
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60 | inherits(LevelUP, EventEmitter)
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61 |
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62 | LevelUP.prototype.open = function (callback) {
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63 | var self = this
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64 | var promise
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65 |
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66 | if (!callback) {
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67 | callback = promisify()
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68 | promise = callback.promise
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69 | }
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70 |
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71 | if (this.isOpen()) {
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72 | process.nextTick(callback, null, self)
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73 | return promise
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74 | }
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75 |
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76 | if (this._isOpening()) {
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77 | this.once('open', function () { callback(null, self) })
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78 | return promise
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79 | }
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80 |
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81 | this.emit('opening')
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82 |
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83 | this.db.open(this.options, function (err) {
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84 | if (err) {
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85 | return callback(new OpenError(err))
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86 | }
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87 | self.db = self._db
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88 | callback(null, self)
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89 | self.emit('open')
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90 | self.emit('ready')
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91 | })
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92 |
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93 | return promise
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94 | }
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95 |
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96 | LevelUP.prototype.close = function (callback) {
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97 | var self = this
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98 | var promise
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99 |
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100 | if (!callback) {
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101 | callback = promisify()
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102 | promise = callback.promise
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103 | }
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104 |
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105 | if (this.isOpen()) {
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106 | this.db.close(function () {
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107 | self.emit('closed')
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108 | callback.apply(null, arguments)
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109 | })
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110 | this.emit('closing')
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111 | this.db = new DeferredLevelDOWN(this._db)
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112 | } else if (this.isClosed()) {
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113 | process.nextTick(callback)
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114 | } else if (this.db.status === 'closing') {
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115 | this.once('closed', callback)
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116 | } else if (this._isOpening()) {
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117 | this.once('open', function () {
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118 | self.close(callback)
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119 | })
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120 | }
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121 |
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122 | return promise
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123 | }
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124 |
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125 | LevelUP.prototype.isOpen = function () {
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126 | return this.db.status === 'open'
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127 | }
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128 |
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129 | LevelUP.prototype._isOpening = function () {
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130 | return this.db.status === 'opening'
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131 | }
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132 |
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133 | LevelUP.prototype.isClosed = function () {
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134 | return (/^clos|new/).test(this.db.status)
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135 | }
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136 |
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137 | LevelUP.prototype.get = function (key, options, callback) {
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138 | if (key === null || key === undefined) {
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139 | throw new ReadError('get() requires a key argument')
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140 | }
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141 |
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142 | var promise
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143 |
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144 | callback = getCallback(options, callback)
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145 |
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146 | if (!callback) {
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147 | callback = promisify()
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148 | promise = callback.promise
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149 | }
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150 |
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151 | if (maybeError(this, callback)) { return promise }
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152 |
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153 | options = getOptions(options)
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154 |
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155 | this.db.get(key, options, function (err, value) {
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156 | if (err) {
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157 | if ((/notfound/i).test(err) || err.notFound) {
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158 | err = new NotFoundError('Key not found in database [' + key + ']', err)
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159 | } else {
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160 | err = new ReadError(err)
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161 | }
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162 | return callback(err)
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163 | }
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164 | callback(null, value)
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165 | })
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166 |
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167 | return promise
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168 | }
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169 |
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170 | LevelUP.prototype.put = function (key, value, options, callback) {
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171 | if (key === null || key === undefined) {
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172 | throw new WriteError('put() requires a key argument')
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173 | }
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174 |
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175 | var self = this
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176 | var promise
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177 |
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178 | callback = getCallback(options, callback)
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179 |
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180 | if (!callback) {
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181 | callback = promisify()
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182 | promise = callback.promise
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183 | }
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184 |
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185 | if (maybeError(this, callback)) { return promise }
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186 |
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187 | options = getOptions(options)
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188 |
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189 | this.db.put(key, value, options, function (err) {
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190 | if (err) {
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191 | return callback(new WriteError(err))
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192 | }
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193 | self.emit('put', key, value)
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194 | callback()
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195 | })
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196 |
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197 | return promise
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198 | }
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199 |
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200 | LevelUP.prototype.del = function (key, options, callback) {
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201 | if (key === null || key === undefined) {
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202 | throw new WriteError('del() requires a key argument')
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203 | }
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204 |
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205 | var self = this
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206 | var promise
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207 |
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208 | callback = getCallback(options, callback)
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209 |
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210 | if (!callback) {
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211 | callback = promisify()
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212 | promise = callback.promise
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213 | }
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214 |
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215 | if (maybeError(this, callback)) { return promise }
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216 |
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217 | options = getOptions(options)
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218 |
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219 | this.db.del(key, options, function (err) {
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220 | if (err) {
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221 | return callback(new WriteError(err))
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222 | }
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223 | self.emit('del', key)
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224 | callback()
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225 | })
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226 |
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227 | return promise
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228 | }
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229 |
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230 | LevelUP.prototype.batch = function (arr, options, callback) {
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231 | if (!arguments.length) {
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232 | return new Batch(this)
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233 | }
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234 |
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235 | if (!Array.isArray(arr)) {
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236 | throw new WriteError('batch() requires an array argument')
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237 | }
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238 |
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239 | var self = this
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240 | var promise
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241 |
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242 | callback = getCallback(options, callback)
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243 |
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244 | if (!callback) {
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245 | callback = promisify()
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246 | promise = callback.promise
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247 | }
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248 |
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249 | if (maybeError(this, callback)) { return promise }
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250 |
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251 | options = getOptions(options)
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252 |
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253 | this.db.batch(arr, options, function (err) {
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254 | if (err) {
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255 | return callback(new WriteError(err))
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256 | }
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257 | self.emit('batch', arr)
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258 | callback()
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259 | })
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260 |
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261 | return promise
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262 | }
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263 |
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264 | LevelUP.prototype.iterator = function (options) {
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265 | return this.db.iterator(options)
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266 | }
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267 |
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268 | LevelUP.prototype.readStream =
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269 | LevelUP.prototype.createReadStream = function (options) {
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270 | options = extend({ keys: true, values: true }, options)
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271 | if (typeof options.limit !== 'number') { options.limit = -1 }
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272 | return new IteratorStream(this.db.iterator(options), options)
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273 | }
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274 |
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275 | LevelUP.prototype.keyStream =
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276 | LevelUP.prototype.createKeyStream = function (options) {
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277 | return this.createReadStream(extend(options, { keys: true, values: false }))
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278 | }
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279 |
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280 | LevelUP.prototype.valueStream =
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281 | LevelUP.prototype.createValueStream = function (options) {
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282 | return this.createReadStream(extend(options, { keys: false, values: true }))
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283 | }
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284 |
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285 | LevelUP.prototype.toString = function () {
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286 | return 'LevelUP'
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287 | }
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288 |
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289 | function getCallback (options, callback) {
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290 | return typeof options === 'function' ? options : callback
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291 | }
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292 |
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293 | function getOptions (options) {
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294 | return typeof options === 'object' && options !== null ? options : {}
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295 | }
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296 |
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297 | function maybeError (db, callback) {
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298 | if (!db._isOpening() && !db.isOpen()) {
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299 | process.nextTick(callback, new ReadError('Database is not open'))
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300 | return true
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301 | }
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302 | }
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303 |
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304 | LevelUP.errors = errors
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305 | module.exports = LevelUP.default = LevelUP
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