@chix/loader-fs/lib/fs.js

"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = Object.setPrototypeOf ||
        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = y[op[0] & 2 ? "return" : op[0] ? "throw" : "next"]) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [0, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
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            op = body.call(thisArg, _);
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        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
var loader_remote_1 = require("@chix/loader-remote");
var fs = require("fs");
var util = require("util");
var util_1 = require("./util");
var readFile = util.promisify(fs.readFile);
var syncer;
function nop() { }
/**
 *  Loads and saves definitions from/to the local cache file.
 */
var FSLoader = /** @class */ (function (_super) {
    __extends(FSLoader, _super);
    function FSLoader(opts) {
        if (opts === void 0) { opts = {}; }
        var _this = _super.call(this) || this;
        _this.opts = {};
        _this._cacheFile = './.x.cache';
        _this.opts.cache = Boolean(opts.cache);
        _this.opts.purge = Boolean(opts.purge);
        // purge the cache file
        if (_this.opts.purge) {
            try {
                fs.unlinkSync(_this._cacheFile);
                _this.emit('purgeCache', {
                    file: _this._cacheFile
                });
            }
            catch (error) {
                nop();
            }
        }
        if (_this.opts.cache && !_this.opts.purge) {
            if (syncer) {
                process.removeListener('exit', syncer);
            }
            else {
                // re-used
                process.on('SIGINT', function () {
                    process.exit();
                });
            }
            syncer = _this.syncState.bind(_this);
            process.on('exit', syncer);
        }
        return _this;
    }
    /**
     *
     *  Loads all definitions from the database.
     *  Any missing pieces will be loaded by remote Loader.
     *
     *  If you use `update` all definitions in the database will be refreshed.
     *
     * @param {Object} flow
     * @param {Boolean} update
     */
    FSLoader.prototype.load = function (flow, update) {
        if (update === void 0) { update = false; }
        return __awaiter(this, void 0, void 0, function () {
            var content, cache, error_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!this.opts.cache) return [3 /*break*/, 4];
                        _a.label = 1;
                    case 1:
                        _a.trys.push([1, 3, , 4]);
                        return [4 /*yield*/, readFile(this._cacheFile, 'utf8')];
                    case 2:
                        content = _a.sent();
                        cache = JSON.parse(content);
                        this.setDependencies(cache.dependencies);
                        this.setNodeDefinitions(cache.nodeDefinitions);
                        this.emit('loadCache', {
                            file: this._cacheFile,
                            cache: cache
                        });
                        // Start the remote loader, It will not load any known definitions.
                        return [2 /*return*/, _super.prototype.load.call(this, flow, update)];
                    case 3:
                        error_1 = _a.sent();
                        if (error_1.code !== 'ENOENT') {
                            throw Error(error_1);
                        }
                        return [3 /*break*/, 4];
                    case 4: return [2 /*return*/, _super.prototype.load.call(this, flow, update)];
                }
            });
        });
    };
    /**
     *
     * Loads a local file
     *
     * @param {NodeDefinitionLocationFS} location
     */
    FSLoader.prototype.loadFile = function (location) {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                this.emit('loadFile', { path: location.path });
                return [2 /*return*/, util_1.loadFile(location)];
            });
        });
    };
    /**
     * Saves the internal state to disk
     */
    FSLoader.prototype.syncState = function () {
        // save internal state to disk
        fs.writeFileSync(this._cacheFile, JSON.stringify({
            dependencies: this.getDependencies(),
            nodeDefinitions: this.getNodeDefinitions()
        }, null, 2));
        this.emit('writeCache', {
            file: this._cacheFile
        });
    };
    return FSLoader;
}(loader_remote_1.RemoteLoader));
exports.FSLoader = FSLoader;
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