hybrid-disk-cache
Version:
A hybrid disk cache utilize both the database and the file system.
123 lines (122 loc) • 5.75 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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) : adopt(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 = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, 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 __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.purgeEmptyPath = exports.md5name = exports.read = exports.write = void 0;
var crypto_1 = require("crypto");
var fs_extra_1 = __importDefault(require("fs-extra"));
var path_1 = __importDefault(require("path"));
function write(dir, filename, data) {
var file = path_1.default.join(dir, filename);
fs_extra_1.default.mkdirpSync(file.slice(0, file.lastIndexOf('/')));
return fs_extra_1.default.writeFileSync(file, data);
}
exports.write = write;
function read(dir, filename) {
return fs_extra_1.default.readFileSync(path_1.default.join(dir, filename));
}
exports.read = read;
function md5name(buf) {
var md5 = crypto_1.createHash('md5');
var str = md5.update(buf).digest('hex');
var p0 = str.slice(0, 2);
var p1 = str.slice(2, 4);
var pe = str.slice(4);
return [p0, p1, pe].join('/') + '.v';
}
exports.md5name = md5name;
function purge(dir) {
return __awaiter(this, void 0, void 0, function () {
var empty, files, _i, files_1, f, sub, stat, _a;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
empty = true;
return [4 /*yield*/, fs_extra_1.default.readdir(dir)];
case 1:
files = _b.sent();
_i = 0, files_1 = files;
_b.label = 2;
case 2:
if (!(_i < files_1.length)) return [3 /*break*/, 8];
f = files_1[_i];
sub = path_1.default.join(dir, f);
return [4 /*yield*/, fs_extra_1.default.stat(sub)];
case 3:
stat = _b.sent();
if (!stat.isDirectory()) return [3 /*break*/, 5];
return [4 /*yield*/, purge(sub)];
case 4:
_a = (_b.sent()) && empty;
return [3 /*break*/, 6];
case 5:
_a = false;
_b.label = 6;
case 6:
empty = _a;
_b.label = 7;
case 7:
_i++;
return [3 /*break*/, 2];
case 8:
if (!empty) return [3 /*break*/, 10];
return [4 /*yield*/, fs_extra_1.default.rmdir(dir)];
case 9:
_b.sent();
_b.label = 10;
case 10: return [2 /*return*/, empty];
}
});
});
}
function purgeEmptyPath(dir) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!fs_extra_1.default.pathExistsSync(dir)) return [3 /*break*/, 2];
return [4 /*yield*/, purge(dir)];
case 1: return [2 /*return*/, _a.sent()];
case 2: return [2 /*return*/, false];
}
});
});
}
exports.purgeEmptyPath = purgeEmptyPath;
;