helene/data/node/node-storage.js

Real-time Web Apps for Node.js

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.NodeStorage = void 0;
/**
 * Way data is stored for this database
 * For a Node.js/Node Webkit database it's the file system
 * For a browser-side database it's localforage which chooses the best option depending on user browser (IndexedDB then WebSQL then localStorage)
 *
 * This version is the Node.js/Node Webkit version
 * It's essentially fs, mkdirp and crash safe write and read functions
 */
const fs_1 = __importDefault(require("fs"));
const mkdirp_1 = require("mkdirp");
const path_1 = __importDefault(require("path"));
const utils_1 = require("./utils");
class NodeStorage {
    async read(name) {
        await (0, mkdirp_1.mkdirp)(path_1.default.dirname(name));
        await (0, utils_1.ensureDatafileIntegrity)(name);
        return await fs_1.default.promises.readFile(name, 'utf8');
    }
    /**
     * Fully write or rewrite the datafile, immune to crashes during the write operation (data will not be lost)
     */
    async write(name, data) {
        // eslint-disable-next-line @typescript-eslint/no-empty-function
        const tempFilename = name + '~';
        await (0, utils_1.flushToStorage)({
            filename: path_1.default.dirname(name),
            isDir: true,
        });
        const exists = fs_1.default.existsSync(name);
        if (exists) {
            await (0, utils_1.flushToStorage)(name);
        }
        fs_1.default.writeFileSync(tempFilename, data);
        await (0, utils_1.flushToStorage)(tempFilename);
        await fs_1.default.promises.rename(tempFilename, name);
        await (0, utils_1.flushToStorage)({
            filename: path_1.default.dirname(name),
            isDir: true,
        });
    }
    async append(name, data) {
        await fs_1.default.promises.appendFile(name, data, 'utf8');
    }
}
exports.NodeStorage = NodeStorage;
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