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greenbean.js~
198
greenbean.js~
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import fs from 'fs/promises';
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import { EventEmitter } from 'events';
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import { v4 as uuidv4 } from 'uuid';
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class GreenBean extends EventEmitter {
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constructor(dbPath = 'data.json') {
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super();
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this.dbPath = dbPath;
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this.data = null;
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this.initialized = false;
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this.frozen = false;
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}
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// Базовые операции с бинами
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async R(type, id = null) {
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if (!this.initialized) await this.init();
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if (id === null) {
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return this.dispense(type);
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}
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return this.load(type, id);
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}
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async dispense(type) {
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if (!this.initialized) await this.init();
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const bean = {
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id: uuidv4(),
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__type: type,
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__meta: {
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created: new Date().toISOString(),
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modified: new Date().toISOString()
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}
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};
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return new Proxy(bean, this.createHandler(type));
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}
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async load(type, id) {
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if (!this.initialized) await this.init();
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const item = this.data[type]?.find(item => item.id === id);
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if (!item) return null;
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return new Proxy({...item}, this.createHandler(type));
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}
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async store(bean) {
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if (this.frozen) throw new Error('Cannot modify frozen beans');
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if (!this.initialized) await this.init();
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const type = bean.__type;
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if (!this.data[type]) this.data[type] = [];
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bean.__meta.modified = new Date().toISOString();
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const index = this.data[type].findIndex(item => item.id === bean.id);
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if (index !== -1) {
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this.data[type][index] = {...bean};
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} else {
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this.data[type].push({...bean});
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}
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await this.save();
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return bean.id;
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}
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async trash(bean) {
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if (this.frozen) throw new Error('Cannot modify frozen beans');
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if (!this.initialized) await this.init();
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const type = bean.__type;
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if (!this.data[type]) return;
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this.data[type] = this.data[type].filter(item => item.id !== bean.id);
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await this.save();
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}
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// Работа со связями
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async own(bean, property, related) {
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if (!Array.isArray(related)) related = [related];
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bean[property] = related.map(item => ({
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id: item.id,
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__type: item.__type
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}));
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await this.store(bean);
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}
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async link(bean, linkType, attributes = {}) {
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const link = await this.dispense(linkType);
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Object.assign(link, attributes, {
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[`${bean.__type}Id`]: bean.id
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});
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await this.store(link);
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return link;
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}
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async find(type, criteria = {}) {
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if (!this.initialized) await this.init();
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if (!this.data[type]) return [];
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return this.data[type]
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.filter(item => {
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return Object.entries(criteria).every(([key, value]) =>
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item[key] === value
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);
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})
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.map(item => new Proxy({...item}, this.createHandler(type)));
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}
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async findOne(type, criteria = {}) {
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const results = await this.find(type, criteria);
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return results[0] || null;
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}
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// Вспомогательные методы
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async init() {
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try {
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const exists = await fs.access(this.dbPath)
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.then(() => true)
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.catch(() => false);
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if (exists) {
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const content = await fs.readFile(this.dbPath, 'utf-8');
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this.data = JSON.parse(content);
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} else {
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this.data = {};
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}
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this.initialized = true;
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} catch (error) {
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throw new Error(`Failed to initialize database: ${error.message}`);
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}
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}
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async save() {
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try {
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const tempPath = `${this.dbPath}.tmp`;
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await fs.writeFile(tempPath, JSON.stringify(this.data, null, 2));
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await fs.rename(tempPath, this.dbPath);
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this.emit('save');
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} catch (error) {
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throw new Error(`Failed to save database: ${error.message}`);
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}
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}
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createHandler(type) {
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return {
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get: (target, prop) => {
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if (prop.endsWith('List') && !target[prop]) {
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target[prop] = [];
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}
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return target[prop];
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},
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set: (target, prop, value) => {
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if (this.frozen) throw new Error('Cannot modify frozen beans');
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if (prop.endsWith('List') && Array.isArray(value)) {
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target[prop] = value.map(item => ({
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id: item.id,
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__type: item.__type || type
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}));
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} else {
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target[prop] = value;
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}
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return true;
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}
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};
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}
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// Утилиты
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freeze(frozen = true) {
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this.frozen = frozen;
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}
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async nuke() {
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if (this.frozen) throw new Error('Cannot nuke frozen database');
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this.data = {};
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await this.save();
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}
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async transaction(callback) {
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const snapshot = JSON.stringify(this.data);
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try {
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const result = await callback();
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await this.save();
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return result;
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} catch (error) {
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this.data = JSON.parse(snapshot);
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throw error;
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}
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}
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}
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export default GreenBean;
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