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Website : rimsha.abasa.com
: / var / canvas / node_modules / apollo-cache-persist /
Filename : Persistor.js
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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; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
var Persistor = (function () {
    function Persistor(_a, options) {
        var log = _a.log, cache = _a.cache, storage = _a.storage;
        var _b = options.maxSize, maxSize = _b === void 0 ? 1024 * 1024 : _b;
        this.log = log;
        this.cache = cache;
        this.storage = storage;
        this.paused = false;
        if (maxSize) {
            this.maxSize = maxSize;
        }
    }
    Persistor.prototype.persist = function () {
        return __awaiter(this, void 0, void 0, function () {
            var data, error_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        _a.trys.push([0, 4, , 5]);
                        data = this.cache.extract();
                        if (!(this.maxSize != null &&
                            typeof data === 'string' &&
                            data.length > this.maxSize &&
                            !this.paused)) return [3, 2];
                        return [4, this.purge()];
                    case 1:
                        _a.sent();
                        this.paused = true;
                        return [2];
                    case 2:
                        if (this.paused) {
                            this.paused = false;
                        }
                        return [4, this.storage.write(data)];
                    case 3:
                        _a.sent();
                        this.log.info(typeof data === 'string'
                            ? "Persisted cache of size " + data.length
                            : 'Persisted cache');
                        return [3, 5];
                    case 4:
                        error_1 = _a.sent();
                        this.log.error('Error persisting cache', error_1);
                        throw error_1;
                    case 5: return [2];
                }
            });
        });
    };
    Persistor.prototype.restore = function () {
        return __awaiter(this, void 0, void 0, function () {
            var data, error_2;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        _a.trys.push([0, 5, , 6]);
                        return [4, this.storage.read()];
                    case 1:
                        data = _a.sent();
                        if (!(data != null)) return [3, 3];
                        return [4, this.cache.restore(data)];
                    case 2:
                        _a.sent();
                        this.log.info(typeof data === 'string'
                            ? "Restored cache of size " + data.length
                            : 'Restored cache');
                        return [3, 4];
                    case 3:
                        this.log.info('No stored cache to restore');
                        _a.label = 4;
                    case 4: return [3, 6];
                    case 5:
                        error_2 = _a.sent();
                        this.log.error('Error restoring cache', error_2);
                        throw error_2;
                    case 6: return [2];
                }
            });
        });
    };
    Persistor.prototype.purge = function () {
        return __awaiter(this, void 0, void 0, function () {
            var error_3;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        _a.trys.push([0, 2, , 3]);
                        return [4, this.storage.purge()];
                    case 1:
                        _a.sent();
                        this.log.info('Purged cache storage');
                        return [3, 3];
                    case 2:
                        error_3 = _a.sent();
                        this.log.error('Error purging cache storage', error_3);
                        throw error_3;
                    case 3: return [2];
                }
            });
        });
    };
    return Persistor;
}());
export default Persistor;
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