154 lines
3.3 KiB
JavaScript
154 lines
3.3 KiB
JavaScript
import lowdb from 'lowdb'
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import FileAsync from 'lowdb/adapters/FileAsync.js'
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let lastId = -1
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// Take from https://github.com/typicode/lodash-id/blob/master/src/index.js
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// from package lodash-id
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const lodashId = {
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// Empties properties
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__empty: function (doc) {
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this.forEach(doc, function (value, key) {
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delete doc[key]
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})
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},
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// Copies properties from an object to another
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__update: function (dest, src) {
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this.forEach(src, function (value, key) {
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dest[key] = value
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})
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},
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// Removes an item from an array
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__remove: function (array, item) {
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var index = this.indexOf(array, item)
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if (index !== -1) array.splice(index, 1)
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},
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__id: function () {
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var id = this.id || 'id'
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return id
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},
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getById: function (collection, id) {
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var self = this
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return this.find(collection, function (doc) {
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if (self.has(doc, self.__id())) {
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return doc[self.__id()] === id
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}
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})
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},
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createId: function (collection, doc) {
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let next = new Date().getTime()
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if (next <= lastId) {
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next = lastId + 1
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}
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lastId = next
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return next
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},
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insert: function (collection, doc) {
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doc[this.__id()] = doc[this.__id()] || this.createId(collection, doc)
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var d = this.getById(collection, doc[this.__id()])
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if (d) throw new Error('Insert failed, duplicate id')
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collection.push(doc)
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return doc
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},
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upsert: function (collection, doc) {
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if (doc[this.__id()]) {
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// id is set
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var d = this.getById(collection, doc[this.__id()])
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if (d) {
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// replace properties of existing object
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this.__empty(d)
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this.assign(d, doc)
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} else {
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// push new object
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collection.push(doc)
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}
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} else {
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// create id and push new object
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doc[this.__id()] = this.createId(collection, doc)
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collection.push(doc)
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}
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return doc
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},
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updateById: function (collection, id, attrs) {
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var doc = this.getById(collection, id)
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if (doc) {
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this.assign(doc, attrs, {id: doc.id})
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}
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return doc
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},
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updateWhere: function (collection, predicate, attrs) {
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var self = this
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var docs = this.filter(collection, predicate)
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docs.forEach(function (doc) {
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self.assign(doc, attrs, {id: doc.id})
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})
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return docs
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},
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replaceById: function (collection, id, attrs) {
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var doc = this.getById(collection, id)
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if (doc) {
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var docId = doc.id
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this.__empty(doc)
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this.assign(doc, attrs, {id: docId})
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}
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return doc
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},
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removeById: function (collection, id) {
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var doc = this.getById(collection, id)
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this.__remove(collection, doc)
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return doc
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},
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removeWhere: function (collection, predicate) {
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var self = this
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var docs = this.filter(collection, predicate)
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docs.forEach(function (doc) {
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self.__remove(collection, doc)
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})
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return docs
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}
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}
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const adapter = new FileAsync('db.json')
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export default function GetDB(log) {
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return lowdb(adapter)
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.then(function(db) {
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db._.mixin(lodashId)
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db.defaults({
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lastActiveVersion: null,
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version: 1,
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})
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.write()
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.then(
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function() { },
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function(e) { log.error(e, 'Error writing defaults to lowdb') }
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)
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return db
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})
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}
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