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leveldown.js
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leveldown.js
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'use strict'
const util = require('util')
const AbstractLevelDOWN = require('abstract-leveldown').AbstractLevelDOWN
const binding = require('./binding')
const ChainedBatch = require('./chained-batch')
const Iterator = require('./iterator')
function LevelDOWN (location) {
if (!(this instanceof LevelDOWN)) {
return new LevelDOWN(location)
}
if (typeof location !== 'string') {
throw new Error('constructor requires a location string argument')
}
AbstractLevelDOWN.call(this, {
bufferKeys: true,
snapshots: true,
permanence: true,
seek: true,
clear: true,
createIfMissing: true,
errorIfExists: true,
additionalMethods: {
approximateSize: true,
compactRange: true
}
})
this.location = location
this.context = binding.db_init()
}
util.inherits(LevelDOWN, AbstractLevelDOWN)
LevelDOWN.prototype._open = function (options, callback) {
binding.db_open(this.context, this.location, options, callback)
}
LevelDOWN.prototype._close = function (callback) {
binding.db_close(this.context, callback)
}
LevelDOWN.prototype._serializeKey = function (key) {
return Buffer.isBuffer(key) ? key : String(key)
}
LevelDOWN.prototype._serializeValue = function (value) {
return Buffer.isBuffer(value) ? value : String(value)
}
LevelDOWN.prototype._put = function (key, value, options, callback) {
binding.db_put(this.context, key, value, options, callback)
}
LevelDOWN.prototype._get = function (key, options, callback) {
binding.db_get(this.context, key, options, callback)
}
LevelDOWN.prototype._del = function (key, options, callback) {
binding.db_del(this.context, key, options, callback)
}
LevelDOWN.prototype._chainedBatch = function () {
return new ChainedBatch(this)
}
LevelDOWN.prototype._batch = function (operations, options, callback) {
binding.batch_do(this.context, operations, options, callback)
}
LevelDOWN.prototype.approximateSize = function (start, end, callback) {
if (start == null ||
end == null ||
typeof start === 'function' ||
typeof end === 'function') {
throw new Error('approximateSize() requires valid `start` and `end` arguments')
}
if (typeof callback !== 'function') {
throw new Error('approximateSize() requires a callback argument')
}
start = this._serializeKey(start)
end = this._serializeKey(end)
binding.db_approximate_size(this.context, start, end, callback)
}
LevelDOWN.prototype.compactRange = function (start, end, callback) {
if (start == null ||
end == null ||
typeof start === 'function' ||
typeof end === 'function') {
throw new Error('compactRange() requires valid `start` and `end` arguments')
}
if (typeof callback !== 'function') {
throw new Error('compactRange() requires a callback argument')
}
start = this._serializeKey(start)
end = this._serializeKey(end)
binding.db_compact_range(this.context, start, end, callback)
}
LevelDOWN.prototype.getProperty = function (property) {
if (typeof property !== 'string') {
throw new Error('getProperty() requires a valid `property` argument')
}
return binding.db_get_property(this.context, property)
}
LevelDOWN.prototype._iterator = function (options) {
if (this.status !== 'open') {
// Prevent segfault
throw new Error('cannot call iterator() before open()')
}
return new Iterator(this, options)
}
LevelDOWN.destroy = function (location, callback) {
if (arguments.length < 2) {
throw new Error('destroy() requires `location` and `callback` arguments')
}
if (typeof location !== 'string') {
throw new Error('destroy() requires a location string argument')
}
if (typeof callback !== 'function') {
throw new Error('destroy() requires a callback function argument')
}
binding.destroy_db(location, callback)
}
LevelDOWN.repair = function (location, callback) {
if (arguments.length < 2) {
throw new Error('repair() requires `location` and `callback` arguments')
}
if (typeof location !== 'string') {
throw new Error('repair() requires a location string argument')
}
if (typeof callback !== 'function') {
throw new Error('repair() requires a callback function argument')
}
binding.repair_db(location, callback)
}
module.exports = LevelDOWN