From bf4b1a493241a37db8e1ee076b20b21739e53563 Mon Sep 17 00:00:00 2001 From: a2nr Date: Sun, 19 Jul 2026 19:03:40 +0700 Subject: [PATCH] feat(frontend): add vitest + ByteStreamBuffer FIFO for orphan-read fix MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Test runner setup (vitest) plus deadline-based FIFO buffer that becomes the single sink for serial bytes. readExact keeps partial bytes buffered on timeout — the exact case that dropped optiboot INSYNC/OK replies under the orphaned-reader race. 7 unit tests pass. --- frontend/package-lock.json | 1375 ++++++++++++++++- frontend/package.json | 7 +- .../lib/services/byte-stream-buffer.test.ts | 63 + .../src/lib/services/byte-stream-buffer.ts | 104 ++ frontend/vitest.config.ts | 8 + 5 files changed, 1554 insertions(+), 3 deletions(-) create mode 100644 frontend/src/lib/services/byte-stream-buffer.test.ts create mode 100644 frontend/src/lib/services/byte-stream-buffer.ts create mode 100644 frontend/vitest.config.ts diff --git a/frontend/package-lock.json b/frontend/package-lock.json index 0459d02..2e1a998 100644 --- a/frontend/package-lock.json +++ b/frontend/package-lock.json @@ -24,7 +24,8 @@ "svelte": "^5.0.0", "svelte-check": "^4.0.0", "typescript": "^5.0.0", - "vite": "^6.0.0" + "vite": "^6.0.0", + "vitest": "^2.1.9" } }, "node_modules/@codemirror/autocomplete": { @@ -1300,6 +1301,92 @@ "dev": true, "license": "MIT" }, + "node_modules/@vitest/expect": { + "version": "2.1.9", + "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-2.1.9.tgz", + "integrity": "sha512-UJCIkTBenHeKT1TTlKMJWy1laZewsRIzYighyYiJKZreqtdxSos/S1t+ktRMQWu2CKqaarrkeszJx1cgC5tGZw==", + "dev": true, + "license": "MIT", + "dependencies": { + "@vitest/spy": "2.1.9", + "@vitest/utils": "2.1.9", + "chai": "^5.1.2", + "tinyrainbow": "^1.2.0" + }, + "funding": { + "url": "https://opencollective.com/vitest" + } + }, + "node_modules/@vitest/pretty-format": { + "version": "2.1.9", + "resolved": "https://registry.npmjs.org/@vitest/pretty-format/-/pretty-format-2.1.9.tgz", + "integrity": "sha512-KhRIdGV2U9HOUzxfiHmY8IFHTdqtOhIzCpd8WRdJiE7D/HUcZVD0EgQCVjm+Q9gkUXWgBvMmTtZgIG48wq7sOQ==", + "dev": true, + "license": "MIT", + "dependencies": { + "tinyrainbow": "^1.2.0" + }, + "funding": { + "url": "https://opencollective.com/vitest" + } + }, + "node_modules/@vitest/runner": { + "version": "2.1.9", + "resolved": "https://registry.npmjs.org/@vitest/runner/-/runner-2.1.9.tgz", + "integrity": "sha512-ZXSSqTFIrzduD63btIfEyOmNcBmQvgOVsPNPe0jYtESiXkhd8u2erDLnMxmGrDCwHCCHE7hxwRDCT3pt0esT4g==", + "dev": true, + "license": "MIT", + "dependencies": { + "@vitest/utils": "2.1.9", + "pathe": "^1.1.2" + }, + "funding": { + "url": "https://opencollective.com/vitest" + } + }, + "node_modules/@vitest/snapshot": { + "version": "2.1.9", + "resolved": "https://registry.npmjs.org/@vitest/snapshot/-/snapshot-2.1.9.tgz", + "integrity": 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"dependencies": { + "@vitest/pretty-format": "2.1.9", + "loupe": "^3.1.2", + "tinyrainbow": "^1.2.0" + }, + "funding": { + "url": "https://opencollective.com/vitest" + } + }, "node_modules/acorn": { "version": "8.17.0", "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.17.0.tgz", @@ -1323,6 +1410,16 @@ "node": ">= 0.4" } }, + "node_modules/assertion-error": { + "version": "2.0.1", + "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz", + "integrity": "sha512-Izi8RQcffqCeNVgFigKli1ssklIbpHnCYc6AknXGYoB6grJqyeby7jv12JUQgmTAnIDnbck1uxksT4dzN3PWBA==", + "dev": true, + "license": "MIT", + "engines": { + "node": ">=12" + } + }, "node_modules/axobject-query": { "version": "4.1.0", "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-4.1.0.tgz", @@ -1333,6 +1430,43 @@ "node": ">= 0.4" } }, + "node_modules/cac": { + "version": "6.7.14", + "resolved": "https://registry.npmjs.org/cac/-/cac-6.7.14.tgz", + "integrity": 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"devDependencies": { "@sveltejs/adapter-node": "^5.0.0", @@ -16,7 +18,8 @@ "svelte": "^5.0.0", "svelte-check": "^4.0.0", "typescript": "^5.0.0", - "vite": "^6.0.0" + "vite": "^6.0.0", + "vitest": "^2.1.9" }, "dependencies": { "@codemirror/lang-cpp": "^6.0.2", diff --git a/frontend/src/lib/services/byte-stream-buffer.test.ts b/frontend/src/lib/services/byte-stream-buffer.test.ts new file mode 100644 index 0000000..ddde655 --- /dev/null +++ b/frontend/src/lib/services/byte-stream-buffer.test.ts @@ -0,0 +1,63 @@ +import { describe, it, expect } from 'vitest'; +import { ByteStreamBuffer } from './byte-stream-buffer'; + +describe('ByteStreamBuffer', () => { + it('readExact resolves when enough bytes already buffered', async () => { + const buf = new ByteStreamBuffer(); + buf.push(new Uint8Array([0x14, 0x10])); + const out = await buf.readExact(2, 100); + expect(Array.from(out)).toEqual([0x14, 0x10]); + }); + + it('readExact resolves when bytes arrive after the call', async () => { + const buf = new ByteStreamBuffer(); + const p = buf.readExact(2, 200); + setTimeout(() => buf.push(new Uint8Array([0x14])), 20); + setTimeout(() => buf.push(new Uint8Array([0x10])), 40); + const out = await p; + expect(Array.from(out)).toEqual([0x14, 0x10]); + }); + + it('readExact rejects on timeout without consuming future bytes', async () => { + const buf = new ByteStreamBuffer(); + await expect(buf.readExact(1, 30)).rejects.toThrow(/timeout/); + // Byte yang datang setelah timeout tetap tersimpan, tidak hilang. + buf.push(new Uint8Array([0x14])); + const out = await buf.readExact(1, 50); + expect(Array.from(out)).toEqual([0x14]); + }); + + it('partial bytes before timeout remain buffered for next read', async () => { + const buf = new ByteStreamBuffer(); + buf.push(new Uint8Array([0x14])); + await expect(buf.readExact(2, 30)).rejects.toThrow(/timeout/); + buf.push(new Uint8Array([0x10])); + // 0x14 yang belum terpakai harus masih ada → total [0x14,0x10]. + const out = await buf.readExact(2, 50); + expect(Array.from(out)).toEqual([0x14, 0x10]); + }); + + it('readAvailable drains everything currently buffered', () => { + const buf = new ByteStreamBuffer(); + buf.push(new Uint8Array([1, 2, 3])); + const out = buf.readAvailable(); + expect(Array.from(out)).toEqual([1, 2, 3]); + expect(buf.length).toBe(0); + }); + + it('clear empties the buffer', () => { + const buf = new ByteStreamBuffer(); + buf.push(new Uint8Array([1, 2, 3])); + buf.clear(); + expect(buf.length).toBe(0); + }); + + it('onData fires for each pushed chunk', () => { + const buf = new ByteStreamBuffer(); + const seen: number[] = []; + buf.onData = (chunk) => seen.push(...chunk); + buf.push(new Uint8Array([5, 6])); + buf.push(new Uint8Array([7])); + expect(seen).toEqual([5, 6, 7]); + }); +}); diff --git a/frontend/src/lib/services/byte-stream-buffer.ts b/frontend/src/lib/services/byte-stream-buffer.ts new file mode 100644 index 0000000..df4d720 --- /dev/null +++ b/frontend/src/lib/services/byte-stream-buffer.ts @@ -0,0 +1,104 @@ +/** + * FIFO byte buffer for Web Serial reads. + * + * A single external pump loop is the ONLY caller of reader.read() and feeds + * bytes here via push(). Consumers (readExact, drain, serial monitor) read + * from this buffer and never touch reader.read() directly — eliminating the + * orphaned-read race that dropped optiboot's INSYNC/OK replies. + */ +export class ByteStreamBuffer { + /** Optional hook: called synchronously with every pushed chunk (serial monitor). */ + onData: ((chunk: Uint8Array) => void) | null = null; + + private chunks: Uint8Array[] = []; + private totalLen = 0; + /** Waiters parked in readExact, notified on push. */ + private waiters: Array<() => void> = []; + + get length(): number { + return this.totalLen; + } + + /** Feed bytes from the pump loop. */ + push(chunk: Uint8Array): void { + if (chunk.length > 0) { + this.chunks.push(chunk); + this.totalLen += chunk.length; + const waiters = this.waiters; + this.waiters = []; + for (const w of waiters) w(); + } + /* Fire onData even for empty chunk? No — only real data. */ + if (chunk.length > 0 && this.onData) this.onData(chunk); + } + + /** Remove and return all currently buffered bytes (non-blocking). */ + readAvailable(): Uint8Array { + return this.take(this.totalLen); + } + + /** Discard everything buffered. */ + clear(): void { + this.chunks = []; + this.totalLen = 0; + } + + /** + * Resolve with exactly `len` bytes, or reject after `timeoutMs`. + * Bytes already buffered are consumed immediately; otherwise we park a + * waiter until enough arrive or the deadline passes. On timeout, any + * bytes shorter than `len` REMAIN buffered for the next call. + */ + readExact(len: number, timeoutMs: number): Promise { + return new Promise((resolve, reject) => { + const deadline = Date.now() + timeoutMs; + + const attempt = () => { + if (this.totalLen >= len) { + resolve(this.take(len)); + return; + } + const remaining = deadline - Date.now(); + if (remaining <= 0) { + reject(new Error(`read timeout: got ${this.totalLen}/${len}`)); + return; + } + let timer: ReturnType; + const onPush = () => { + clearTimeout(timer); + attempt(); + }; + timer = setTimeout(() => { + /* Remove our waiter so a late push doesn't call a dead cb. */ + this.waiters = this.waiters.filter((w) => w !== onPush); + attempt(); + }, remaining); + this.waiters.push(onPush); + }; + + attempt(); + }); + } + + /** Pull up to `n` bytes off the front of the queue. */ + private take(n: number): Uint8Array { + const want = Math.min(n, this.totalLen); + const out = new Uint8Array(want); + let filled = 0; + while (filled < want && this.chunks.length > 0) { + const head = this.chunks[0]; + const need = want - filled; + if (head.length <= need) { + out.set(head, filled); + filled += head.length; + this.chunks.shift(); + } else { + out.set(head.subarray(0, need), filled); + this.chunks[0] = head.subarray(need); + filled += need; + } + } + this.totalLen -= want; + return out; + } +} diff --git a/frontend/vitest.config.ts b/frontend/vitest.config.ts new file mode 100644 index 0000000..9b11f7a --- /dev/null +++ b/frontend/vitest.config.ts @@ -0,0 +1,8 @@ +import { defineConfig } from 'vitest/config'; + +export default defineConfig({ + test: { + environment: 'node', + include: ['src/**/*.test.ts'] + } +});