test_runner: fix test deserialize edge cases

PR-URL: #48106
Fixes: #48103
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

lib/internal/test_runner/reporter/v8-serializer.js

@@ -1,12 +1,17 @@
 'use strict';
 
+const {
+  TypedArrayPrototypeGetLength,
+} = primordials;
 const { DefaultSerializer } = require('v8');
 const { Buffer } = require('buffer');
 const { serializeError } = require('internal/error_serdes');
 
 
 module.exports = async function* v8Reporter(source) {
   const serializer = new DefaultSerializer();
+  serializer.writeHeader();
+  const headerLength = TypedArrayPrototypeGetLength(serializer.releaseBuffer());
 
   for await (const item of source) {
     const originalError = item.data.details?.error;
@@ -16,6 +21,7 @@ module.exports = async function* v8Reporter(source) {
       // Error is restored after serialization.
       item.data.details.error = serializeError(originalError);
     }
+    serializer.writeHeader();
     // Add 4 bytes, to later populate with message length
     serializer.writeRawBytes(Buffer.allocUnsafe(4));
     serializer.writeHeader();
@@ -26,14 +32,14 @@ module.exports = async function* v8Reporter(source) {
     }
 
     const serializedMessage = serializer.releaseBuffer();
-    const serializedMessageLength = serializedMessage.length - 4;
+    const serializedMessageLength = serializedMessage.length - (4 + headerLength);
 
     serializedMessage.set([
       serializedMessageLength >> 24 & 0xFF,
       serializedMessageLength >> 16 & 0xFF,
       serializedMessageLength >> 8 & 0xFF,
       serializedMessageLength & 0xFF,
-    ], 0);
+    ], headerLength);
     yield serializedMessage;
   }
 };

lib/internal/test_runner/runner.js

@@ -162,7 +162,8 @@ function getRunArgs({ path, inspectPort, testNamePatterns }) {
 const serializer = new DefaultSerializer();
 serializer.writeHeader();
 const v8Header = serializer.releaseBuffer();
-const kSerializedSizeHeader = 4;
+const kV8HeaderLength = TypedArrayPrototypeGetLength(v8Header);
+const kSerializedSizeHeader = 4 + kV8HeaderLength;
 
 class FileTest extends Test {
   // This class maintains two buffers:
@@ -235,22 +236,42 @@ class FileTest extends Test {
     this.#handleReportItem(item);
   }
   reportStarted() {}
-  report() {
+  drain() {
     this.#drainRawBuffer();
     this.#drainReportBuffer();
+  }
+  report() {
+    this.drain();
     const skipReporting = this.#skipReporting();
     if (!skipReporting) {
       super.reportStarted();
       super.report();
     }
   }
   parseMessage(readData) {
-    const dataLength = TypedArrayPrototypeGetLength(readData);
+    let dataLength = TypedArrayPrototypeGetLength(readData);
     if (dataLength === 0) return;
+    const partialV8Header = readData[dataLength - 1] === v8Header[0];
+
+    if (partialV8Header) {
+      // This will break if v8Header length (2 bytes) is changed.
+      // However it is covered by tests.
+      readData = TypedArrayPrototypeSubarray(readData, 0, dataLength - 1);
+      dataLength--;
+    }
 
-    ArrayPrototypePush(this.#rawBuffer, readData);
+    if (this.#rawBuffer[0] && TypedArrayPrototypeGetLength(this.#rawBuffer[0]) < kSerializedSizeHeader) {
+      this.#rawBuffer[0] = Buffer.concat([this.#rawBuffer[0], readData]);
+    } else {
+      ArrayPrototypePush(this.#rawBuffer, readData);
+    }
     this.#rawBufferSize += dataLength;
     this.#proccessRawBuffer();
+
+    if (partialV8Header) {
+      ArrayPrototypePush(this.#rawBuffer, TypedArrayPrototypeSubarray(v8Header, 0, 1));
+      this.#rawBufferSize++;
+    }
   }
   #drainRawBuffer() {
     while (this.#rawBuffer.length > 0) {
@@ -263,16 +284,16 @@ class FileTest extends Test {
     let headerIndex = bufferHead.indexOf(v8Header);
     let nonSerialized = Buffer.alloc(0);
 
-    while (bufferHead && headerIndex !== kSerializedSizeHeader) {
+    while (bufferHead && headerIndex !== 0) {
       const nonSerializedData = headerIndex === -1 ?
         bufferHead :
-        bufferHead.slice(0, headerIndex - kSerializedSizeHeader);
+        bufferHead.slice(0, headerIndex);
       nonSerialized = Buffer.concat([nonSerialized, nonSerializedData]);
       this.#rawBufferSize -= TypedArrayPrototypeGetLength(nonSerializedData);
       if (headerIndex === -1) {
         ArrayPrototypeShift(this.#rawBuffer);
       } else {
-        this.#rawBuffer[0] = bufferHead.subarray(headerIndex - kSerializedSizeHeader);
+        this.#rawBuffer[0] = TypedArrayPrototypeSubarray(bufferHead, headerIndex);
       }
       bufferHead = this.#rawBuffer[0];
       headerIndex = bufferHead?.indexOf(v8Header);
@@ -294,10 +315,10 @@ class FileTest extends Test {
       // We call `readUInt32BE` manually here, because this is faster than first converting
       // it to a buffer and using `readUInt32BE` on that.
       const fullMessageSize = (
-        bufferHead[0] << 24 |
-        bufferHead[1] << 16 |
-        bufferHead[2] << 8 |
-        bufferHead[3]
+        bufferHead[kV8HeaderLength] << 24 |
+        bufferHead[kV8HeaderLength + 1] << 16 |
+        bufferHead[kV8HeaderLength + 2] << 8 |
+        bufferHead[kV8HeaderLength + 3]
       ) + kSerializedSizeHeader;
 
       if (this.#rawBufferSize < fullMessageSize) break;
@@ -473,4 +494,7 @@ function run(options) {
   return root.reporter;
 }
 
-module.exports = { run };
+module.exports = {
+  FileTest, // Exported for tests only
+  run,
+};

test/parallel/test-runner-v8-deserializer.mjs

@@ -0,0 +1,103 @@
+// Flags: --expose-internals --no-warnings
+
+import '../common/index.mjs';
+import { describe, it, beforeEach } from 'node:test';
+import assert from 'node:assert';
+import { finished } from 'node:stream/promises';
+import { DefaultSerializer } from 'node:v8';
+import serializer from 'internal/test_runner/reporter/v8-serializer';
+import runner from 'internal/test_runner/runner';
+
+async function toArray(chunks) {
+  const arr = [];
+  for await (const i of chunks) arr.push(i);
+  return arr;
+}
+
+const chunks = await toArray(serializer([
+  { type: 'test:diagnostic', data: { nesting: 0, details: {}, message: 'diagnostic' } },
+]));
+const defaultSerializer = new DefaultSerializer();
+defaultSerializer.writeHeader();
+const headerLength = defaultSerializer.releaseBuffer().length;
+
+describe('v8 deserializer', () => {
+  let fileTest;
+  let reported;
+  beforeEach(() => {
+    reported = [];
+    fileTest = new runner.FileTest({ name: 'filetest' });
+    fileTest.reporter.on('data', (data) => reported.push(data));
+    assert(fileTest.isClearToSend());
+  });
+
+  async function collectReported(chunks) {
+    chunks.forEach((chunk) => fileTest.parseMessage(chunk));
+    fileTest.drain();
+    fileTest.reporter.end();
+    await finished(fileTest.reporter);
+    return reported;
+  }
+
+  it('should do nothing when no chunks', async () => {
+    const reported = await collectReported([]);
+    assert.deepStrictEqual(reported, []);
+  });
+
+  it('should deserialize a chunk with no serialization', async () => {
+    const reported = await collectReported([Buffer.from('unknown')]);
+    assert.deepStrictEqual(reported, [
+      { data: { __proto__: null, file: 'filetest', message: 'unknown' }, type: 'test:stdout' },
+    ]);
+  });
+
+  it('should deserialize a serialized chunk', async () => {
+    const reported = await collectReported(chunks);
+    assert.deepStrictEqual(reported, [
+      { data: { nesting: 0, details: {}, message: 'diagnostic' }, type: 'test:diagnostic' },
+    ]);
+  });
+
+  it('should deserialize a serialized chunk after non-serialized chunk', async () => {
+    const reported = await collectReported([Buffer.concat([Buffer.from('unknown'), ...chunks])]);
+    assert.deepStrictEqual(reported, [
+      { data: { __proto__: null, file: 'filetest', message: 'unknown' }, type: 'test:stdout' },
+      { data: { nesting: 0, details: {}, message: 'diagnostic' }, type: 'test:diagnostic' },
+    ]);
+  });
+
+  it('should deserialize a serialized chunk before non-serialized output', async () => {
+    const reported = await collectReported([Buffer.concat([ ...chunks, Buffer.from('unknown')])]);
+    assert.deepStrictEqual(reported, [
+      { data: { nesting: 0, details: {}, message: 'diagnostic' }, type: 'test:diagnostic' },
+      { data: { __proto__: null, file: 'filetest', message: 'unknown' }, type: 'test:stdout' },
+    ]);
+  });
+
+  const headerPosition = headerLength * 2 + 4;
+  for (let i = 0; i < headerPosition + 5; i++) {
+    const message = `should deserialize a serialized message split into two chunks {...${i},${i + 1}...}`;
+    it(message, async () => {
+      const data = chunks[0];
+      const reported = await collectReported([data.subarray(0, i), data.subarray(i)]);
+      assert.deepStrictEqual(reported, [
+        { data: { nesting: 0, details: {}, message: 'diagnostic' }, type: 'test:diagnostic' },
+      ]);
+    });
+
+    it(`${message} wrapped by non-serialized data`, async () => {
+      const data = chunks[0];
+      const reported = await collectReported([
+        Buffer.concat([Buffer.from('unknown'), data.subarray(0, i)]),
+        Buffer.concat([data.subarray(i), Buffer.from('unknown')]),
+      ]);
+      assert.deepStrictEqual(reported, [
+        { data: { __proto__: null, file: 'filetest', message: 'unknown' }, type: 'test:stdout' },
+        { data: { nesting: 0, details: {}, message: 'diagnostic' }, type: 'test:diagnostic' },
+        { data: { __proto__: null, file: 'filetest', message: 'unknown' }, type: 'test:stdout' },
+      ]);
+    }
+    );
+  }
+
+});