Improve performance by sending data as-is

.github/workflows/test.yml

@@ -44,7 +44,7 @@ jobs:
           deno-version: ${{ env.DENO_VERSION }}
       - name: Test
         run: |
-          deno test --unstable --allow-read --allow-net
+          deno test --no-check --unstable --allow-read --allow-net
         timeout-minutes: 5
 
   typecheck:

README.md

@@ -7,8 +7,13 @@
 [Deno][deno] module to translate Worker's system of messages into
 [Reader][reader] and [Writer][writer].
 
-Note that `WorkerReader` and `WorkerWriter` access `Deno` namespace thus
-[Using Deno in worker](https://deno.land/manual@v1.7.5/runtime/workers#using-deno-in-worker)
+Note that this package requires
+[`Worker.postMessage` supports structured clone
+algorithm](https://deno.com/blog/v1.10#worker.postmessage-supports-structured-clone-algorithm)
+introduced in Deno v1.10.
+
+Note that this package accesses `Deno` namespace thus
+[Using Deno in worker](https://deno.land/manual@v1.11.0/runtime/workers#using-deno-in-worker)
 must be enabled.
 
 [deno]: https://deno.land/

reader.ts

@@ -16,7 +16,7 @@ export class WorkerReader implements Deno.Reader, Deno.Closer {
     this.#worker = worker;
     this.#worker.onmessage = (e) => {
       if (this.#queue && !this.#closed) {
-        this.#queue.put_nowait(new Uint8Array(e.data));
+        this.#queue.put_nowait(e.data);
       }
     };
   }
@@ -45,8 +45,8 @@ export class WorkerReader implements Deno.Reader, Deno.Closer {
 
   private readFromRemain(p: Uint8Array): number {
     const n = p.byteLength;
-    const d = this.#remain.slice(0, n);
-    this.#remain = this.#remain.slice(n);
+    const d = this.#remain.subarray(0, n);
+    this.#remain = this.#remain.subarray(n);
     p.set(d);
     return d.byteLength;
   }

reader_test.ts

@@ -12,13 +12,13 @@ Deno.test(
     worker.onmessage?.call(
       worker,
       new MessageEvent("worker", {
-        data: [0, 1, 2, 3, 4],
+        data: new Uint8Array([0, 1, 2, 3, 4]),
       }),
     );
     worker.onmessage?.call(
       worker,
       new MessageEvent("worker", {
-        data: [5, 6, 7, 8, 9],
+        data: new Uint8Array([5, 6, 7, 8, 9]),
       }),
     );
     let p: Uint8Array;
@@ -45,14 +45,14 @@ Deno.test(
     worker.onmessage?.call(
       worker,
       new MessageEvent("worker", {
-        data: [0, 1, 2, 3, 4],
+        data: new Uint8Array([0, 1, 2, 3, 4]),
       }),
     );
     reader.close();
     worker.onmessage?.call(
       worker,
       new MessageEvent("worker", {
-        data: [5, 6, 7, 8, 9],
+        data: new Uint8Array([5, 6, 7, 8, 9]),
       }),
     );
     let p: Uint8Array;
@@ -78,14 +78,14 @@ Deno.test(
     worker.onmessage?.call(
       worker,
       new MessageEvent("worker", {
-        data: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+        data: new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]),
       }),
     );
     reader.close();
     worker.onmessage?.call(
       worker,
       new MessageEvent("worker", {
-        data: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+        data: new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]),
       }),
     );
     let n: number | null;

test.ts

@@ -43,8 +43,8 @@ Deno.test({
       ]);
 
       // Peformance check
-      const rtThreshold = 3000;
-      const wtThreshold = 3000;
+      const rtThreshold = 500;
+      const wtThreshold = 500;
       assert(rt < rtThreshold, "Reader is too slow");
       assert(wt < wtThreshold, "Writer is too slow");
     } finally {
@@ -88,8 +88,8 @@ Deno.test({
       ]);
 
       // Peformance check
-      const rtThreshold = 5000;
-      const wtThreshold = 5000;
+      const rtThreshold = 500;
+      const wtThreshold = 500;
       assert(rt < rtThreshold, "Reader is too slow");
       assert(wt < wtThreshold, "Writer is too slow");
     } finally {
@@ -133,8 +133,8 @@ Deno.test({
       ]);
 
       // Peformance check
-      const rtThreshold = 30000;
-      const wtThreshold = 30000;
+      const rtThreshold = 500;
+      const wtThreshold = 500;
       assert(rt < rtThreshold, "Reader is too slow");
       assert(wt < wtThreshold, "Writer is too slow");
     } finally {

types.ts

@@ -1,4 +1,4 @@
-type Payload = number[];
+type Payload = Uint8Array;
 
 export type WorkerForWorkerReader = {
   onmessage?: (message: MessageEvent<Payload>) => void;

writer.ts

@@ -16,10 +16,7 @@ export class WorkerWriter implements Deno.Writer {
    * https://github.com/lambdalisue/deno-workerio/issues/5
    */
   write(p: Uint8Array): Promise<number> {
-    // XXX
-    // Send 'p' as-is once the issue below has resolved.
-    // https://github.com/denoland/deno/issues/3557
-    this.#worker.postMessage(Array.from(p));
+    this.#worker.postMessage(p);
     return Promise.resolve(p.length);
   }
 }

writer_test.ts

@@ -4,7 +4,7 @@ import { WorkerForWorkerWriter, WorkerWriter } from "./mod.ts";
 Deno.test(
   "WorkerWriter invokes internal worker.postMessage when data is written by 'write' method",
   async () => {
-    const posted: number[][] = [];
+    const posted: Uint8Array[] = [];
     const worker: WorkerForWorkerWriter = {
       postMessage(message) {
         posted.push(message);
@@ -13,7 +13,7 @@ Deno.test(
     const writer = new WorkerWriter(worker);
     await writer.write(new Uint8Array([0, 1, 2, 3, 4]));
     await writer.write(new Uint8Array([5, 6, 7, 8, 9]));
-    assertEquals(posted[0], [0, 1, 2, 3, 4]);
-    assertEquals(posted[1], [5, 6, 7, 8, 9]);
+    assertEquals(posted[0], new Uint8Array([0, 1, 2, 3, 4]));
+    assertEquals(posted[1], new Uint8Array([5, 6, 7, 8, 9]));
   },
 );