@ocap/indexdb-memory/lib/table/base.js

OCAP indexdb adapter that uses memory as backend, just for test purpose

/* eslint-disable no-underscore-dangle */
const { BaseIndex } = require('@ocap/indexdb');
const Lokijs = require('lokijs');

const debug = require('debug')(require('../../package.json').name);

const db = new Lokijs('ocap-memory-indexdb.db');

class MemoryIndex extends BaseIndex {
  constructor(name, uniqIndex) {
    super(name, uniqIndex);

    this.uniqIndex = uniqIndex;

    this.collection = db.addCollection(name, { unique: [this.primaryKey], clone: true });
    this.markReady();
  }

  count(...args) {
    return this.collection.count(...args);
  }

  _insert(row) {
    debug(`insert ${this.name}`, row);

    const id = this.generatePrimaryKey(row);
    return this.collection.insert({ [this.primaryKey]: id, ...row });
  }

  _get(key) {
    const id = this.generatePrimaryKey(key);
    return key ? this.collection.by(this.primaryKey, id) : null;
  }

  _update(key, updates) {
    const id = this.generatePrimaryKey(key);
    // Don't call this._get here cause _get may be overwritten
    const doc = MemoryIndex.prototype._get.call(this, id);
    if (!doc) {
      throw new Error(`${this.name} does not exists: ${key}`);
    }

    Object.assign(doc, updates);
    this.collection.update(doc);
    return doc;
  }

  _reset() {
    this.collection.removeWhere({});
  }
}

module.exports = MemoryIndex;