Revive worker-threads.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tgrid",
-  "version": "0.9.7",
+  "version": "0.9.8",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",
   "description": "Grid Computing Framework for TypeScript",
@@ -23,7 +23,6 @@
   },
   "dependencies": {
     "import2": "^1.0.3",
-    "serialize-error": "^4.1.0",
     "tstl": "^2.5.16",
     "ws": "^7.5.3"
   },

src/components/Communicator.ts

@@ -5,11 +5,9 @@ import { Pair } from "tstl/utility/Pair";
 import { HashMap } from "tstl/container/HashMap";
 import { ConditionVariable } from "tstl/thread/ConditionVariable";
 
-import { Exception } from "tstl/exception/Exception";
 import { DomainError } from "tstl/exception/DomainError";
 import { RuntimeError } from "tstl/exception/RuntimeError";
-
-import serializeError from "serialize-error";
+import { serializeError } from "../utils/internal/serializeError";
 
 /**
  * The basic communicator.
@@ -371,21 +369,18 @@ export abstract class Communicator<Provider> {
    */
   private async _Send_return(
     uid: number,
-    flag: boolean,
-    val: any,
+    success: boolean,
+    value: any,
   ): Promise<void> {
     // SPECIAL LOGIC FOR ERROR -> FOR CLEAR JSON ENCODING
-    if (flag === false && val instanceof Error) {
-      if (typeof (val as Exception).toJSON === "function")
-        val = (val as Exception).toJSON();
-      else val = serializeError(val);
-    }
+    if (success === false && value instanceof Error)
+      value = serializeError(value);
 
     // RETURNS
     const ret: Invoke.IReturn = {
-      uid: uid,
-      success: flag,
-      value: val,
+      uid,
+      success,
+      value,
     };
     await this.sendData(ret);
   }

src/protocols/workers/WorkerConnector.ts

@@ -45,6 +45,9 @@ export class WorkerConnector<Header, Provider extends object | null>
   extends ConnectorBase<Header, Provider>
   implements IWorkerSystem
 {
+  /**
+   * @hidden
+   */
   private readonly compiler_: Singleton<Promise<IWorkerCompiler>>;
 
   /**
@@ -55,18 +58,22 @@ export class WorkerConnector<Header, Provider extends object | null>
   /**
    * Initializer Constructor.
    *
+   * For reference, you're planning to run a bundled JavaScript file,
+   * and you're using the NodeJS environment, you can't use the `"thread"`
+   * mode. You've to use the `"process"` mode instead.
+   *
    * @param header An object containing initialization data like activation.
    * @param provider An object providing features for remote system.
-   * @param type You can specify the worker mode when NodeJS. Default is "thread".
+   * @param type You can specify the worker mode when NodeJS. Default is "process".
    */
   public constructor(
     header: Header,
     provider: Provider,
-    type: "thread" | "process" = "thread",
+    type?: "thread" | "process",
   ) {
     super(header, provider);
     this.compiler_ = new Singleton(() =>
-      is_node() ? NodeWorkerCompiler(type) : WebWorkerCompiler(),
+      is_node() ? NodeWorkerCompiler(type ?? "process") : WebWorkerCompiler(),
     );
   }
 

src/protocols/workers/WorkerServer.ts

@@ -73,13 +73,12 @@ export class WorkerServer<Header, Provider extends object | null>
    */
   public constructor() {
     super(undefined);
-
     this.channel_ = new Singleton(async () => {
+      // BROWSER CASE
       if (is_node() === false) return (<any>self) as IFeature;
 
-      const threadPort = await ThreadPort();
-      return threadPort.is_worker_server()
-        ? ((<any>threadPort) as IFeature)
+      return (await ThreadPort.isWorkerThread())
+        ? ((await ThreadPort()) as IFeature)
         : (ProcessChannel as IFeature);
     });
     this.state_ = WorkerServer.State.NONE;
@@ -88,7 +87,6 @@ export class WorkerServer<Header, Provider extends object | null>
 
       const data: string = await this._Handshake("getHeader");
       const wrapper: IHeaderWrapper<Header> = JSON.parse(data);
-
       return wrapper.header;
     });
   }
@@ -130,7 +128,7 @@ export class WorkerServer<Header, Provider extends object | null>
 
     // SUCCESS
     const channel = await this.channel_.get();
-    channel.onmessage = this._Handle_message.bind(this);
+    channel.onmessage = (evt) => this._Handle_message(evt);
     channel.postMessage(WorkerServer.State.OPEN);
 
     this.state_ = WorkerServer.State.OPEN;

src/protocols/workers/internal/NodeWorkerCompiler.ts

@@ -28,7 +28,6 @@ export const NodeWorkerCompiler = async (
         break;
       }
     }
-
     await FileSystem.write(path, content);
     return path;
   },

src/protocols/workers/internal/threads/ThreadPort.ts

@@ -6,19 +6,36 @@ import { NodeModule } from "../../../../utils/internal/NodeModule";
 /**
  * @hidden
  */
+
 export async function ThreadPort() {
   const { parentPort } = await NodeModule.thread.get();
+  if (!parentPort) throw new Error("This is not a worker thread.");
+
   const process = NodeModule.process();
-  return {
-    postMessage: (message: any) => parentPort!.postMessage(message),
-    close: () => process.exit(0),
-    onmessage: (listener: (event: MessageEvent) => void) =>
-      parentPort!.on("message", (message) =>
-        listener({ data: message } as MessageEvent),
-      ),
-    document: parentPort
-      ? (null! as Document) // NOT WORKER
-      : undefined,
-    is_worker_server: () => !!parentPort,
-  };
+  class ThreadPort {
+    public static postMessage(message: any): void {
+      parentPort!.postMessage(message);
+    }
+    public static close(): void {
+      process.exit(0);
+    }
+    public static set onmessage(listener: (event: MessageEvent) => void) {
+      parentPort!.on("message", (msg) => {
+        listener({ data: msg } as MessageEvent);
+      });
+    }
+    public static get document(): Document {
+      return null!;
+    }
+    public static is_worker_server(): boolean {
+      return true;
+    }
+  }
+  return ThreadPort;
+}
+export namespace ThreadPort {
+  export async function isWorkerThread(): Promise<boolean> {
+    const { parentPort } = await NodeModule.thread.get();
+    return !!parentPort;
+  }
 }

src/utils/internal/serializeError.ts

@@ -0,0 +1,16 @@
+export const serializeError = (error: any) => {
+  if (
+    typeof error === "object" &&
+    error !== null &&
+    typeof error.toJSON === "function"
+  )
+    return error.toJSON();
+  else if (error instanceof Error)
+    return {
+      ...error,
+      name: error.name,
+      stack: error.stack,
+      message: error.message,
+    };
+  return error;
+};

test/node/index.ts

@@ -8,22 +8,23 @@ interface IModule {
 }
 
 async function iterate(path: string): Promise<void> {
-  const file_list: string[] = fs.readdirSync(path);
-  for (const file of file_list) {
-    const current_path: string = path + "/" + file;
-    const stat: fs.Stats = fs.lstatSync(current_path);
+  for (const file of await fs.promises.readdir(path)) {
+    const location: string = path + "/" + file;
+    const stat: fs.Stats = await fs.promises.lstat(location);
+
+    if (file === "utils") console.log(location, stat.isDirectory());
 
     if (stat.isDirectory() === true && file !== "internal") {
-      await iterate(current_path);
+      await iterate(location);
       continue;
     } else if (
       file.substr(-3) !== ".js" ||
-      current_path === __dirname + "/index.js"
+      location === __dirname + "/index.js"
     )
       continue;
 
     const external: IModule = await import(
-      current_path.substr(0, current_path.length - 3)
+      location.substr(0, location.length - 3)
     );
     for (const key in external)
       if (key.substr(0, 5) === "test_") {

test/node/protocols/workers/internal/calculator.ts

@@ -15,6 +15,7 @@ async function get<Controller extends object>(
   const connector: WorkerConnector<null, null> = new WorkerConnector(
     null,
     null,
+    "process",
   );
   await connector.connect(path);
 

test/node/protocols/workers/internal/join.ts

@@ -7,8 +7,7 @@ async function main(): Promise<void> {
   const server: WorkerServer<null, null> = new WorkerServer();
   await server.open(null);
   await server.join();
-
-  await fs.promises.writeFile(FILE_PATH, "WorkerServer.join()", "utf8");
+  fs.writeFileSync(FILE_PATH, "WorkerServer.join()", "utf8");
 }
 main().catch((exp) => {
   console.log(exp);

test/node/protocols/workers/test_hierarchical_workers.ts

@@ -5,6 +5,7 @@ export async function test_hierarchical_workers(): Promise<void> {
   const connector: WorkerConnector<null, null> = new WorkerConnector(
     null,
     null,
+    "process",
   );
   for (let i: number = 0; i < 5; ++i) {
     // DO CONNECT

test/node/protocols/workers/test_worker_compiler.ts

@@ -4,21 +4,13 @@ import cp from "child_process";
 import { ICalculator } from "../../../controllers/ICalculator";
 import { WorkerConnector } from "tgrid";
 
-export function test_worker_connect(): Promise<void> {
-  return _Test_worker(
-    (worker) =>
-      worker.connect(__dirname + "/../../../browser/worker-server.js"),
-    "process",
-  );
-}
-
-export async function test_worker_compile(): Promise<void> {
+export async function test_worker_compiler(): Promise<void> {
   const PATH = __dirname + "/../../../../../bundle/worker-server.js";
   if (fs.existsSync(PATH) === false) cp.execSync("npm run bundle");
 
   await _Test_worker(
     (worker) => worker.compile(fs.readFileSync(PATH, "utf8")),
-    "thread",
+    "process",
   );
 }
 

test/node/protocols/workers/test_worker_join.ts

@@ -1,25 +1,26 @@
+import fs from "fs";
 import { WorkerConnector } from "tgrid";
-import { FileSystem } from "tgrid/lib/protocols/workers/internal/FileSystem";
 import { sleep_for } from "tstl/thread";
 
 const FILE_PATH = __dirname + "/log.dat";
 
 export async function test_worker_join(): Promise<void> {
-  await FileSystem.write(FILE_PATH, "NOT YET");
+  await fs.promises.writeFile(FILE_PATH, "NOT YET", "utf8");
 
   const connector: WorkerConnector<null, null> = new WorkerConnector(
     null,
     null,
   );
   await connector.connect(__dirname + "/internal/join.js");
 
-  sleep_for(100)
+  sleep_for(1_000)
     .then(() => connector.close())
     .catch(() => {});
   await connector.join();
 
-  const content: string = await FileSystem.read(FILE_PATH, "utf8");
-  await FileSystem.unlink(FILE_PATH);
+  await sleep_for(50);
+  const content: string = await fs.promises.readFile(FILE_PATH, "utf8");
+  await fs.promises.unlink(FILE_PATH);
 
   if (content !== "WorkerServer.join()")
     throw new Error("Error on WorkerServer.join()");

test/node/utils/test_util_serialize_error.ts

@@ -0,0 +1,10 @@
+import { serializeError } from "tgrid/lib/utils/internal/serializeError";
+
+export async function test_util_serialize_error(): Promise<void> {
+  const e: TypeError = new TypeError("something wrong");
+  const p: object = JSON.parse(JSON.stringify(serializeError(e)));
+  const keys: string[] = Object.keys(p);
+  for (const expected of ["name", "message", "stack"])
+    if (keys.indexOf(expected) === -1)
+      throw new Error(`Error object does not have ${expected}`);
+}