feat: 解码 worker 化、Playwright E2E 测试体系与文件夹对比(0.6.0)

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2026-08-18 14:40:44 +08:00
parent 2b43b5e676
commit be619c2377
24 changed files with 2030 additions and 151 deletions
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import { readdir, stat, readFile, open } from 'fs/promises'
import { join, relative, sep } from 'path'
/**
* 文件夹对比的纯逻辑模块(仅依赖 node:fs,vitest 以真实临时目录直接测试)。
* 递归枚举两侧目录(跳过 symlink 防环)、按相对路径对齐、字节级内容判定;
* 全部 IO 走异步 fs(libuv 线程池),不阻塞主进程事件循环。
*/
/** 单个文件条目的对比状态 */
export type FolderEntryStatus = 'same' | 'different' | 'left-only' | 'right-only'
export interface FolderEntry {
/** 相对路径(统一 / 分隔,含子目录前缀) */
rel: string
status: FolderEntryStatus
/** 左侧文件字节数;该侧不存在为 null */
leftSize: number | null
/** 右侧文件字节数;该侧不存在为 null */
rightSize: number | null
/** 超过全量比对上限、仅采样头部判定的近似结果(status 为 same 时可能出现) */
approximate?: boolean
}
export interface ScanResult {
/** 全部条目(按相对路径字典序排序) */
entries: FolderEntry[]
/** 因超出文件数量上限被截断(条目不完整,界面提示人工确认) */
truncated: boolean
/** 枚举发现的文件总数(截断时为上限值) */
total: number
}
export interface ScanOptions {
/** 单侧文件数量上限(默认 10000) */
maxFiles?: number
/** 全量字节比对的文件大小上限(默认 10MB,超出仅采样头部 8KB 近似判定) */
maxContentBytes?: number
}
export const FOLDER_MAX_FILES = 10000
export const FOLDER_MAX_CONTENT_BYTES = 10 * 1024 * 1024
/** 近似判定的采样头部字节数 */
const SAMPLE_BYTES = 8 * 1024
/** 递归枚举目录下全部普通文件(跳过子目录与 symlink),返回相对路径 → 大小 */
async function listFiles(
root: string,
maxFiles: number
): Promise<{ files: Map<string, number>; truncated: boolean; total: number }> {
const dirents = await readdir(root, { recursive: true, withFileTypes: true })
const rels: string[] = []
let total = 0
let truncated = false
for (const d of dirents) {
if (!d.isFile()) continue
total++
if (rels.length >= maxFiles) {
truncated = true
continue
}
// parentPath 为 Node 20.12+ 的 Dirent 属性(旧名 path
rels.push(relative(root, join(d.parentPath, d.name)).split(sep).join('/'))
}
// 并行 stat(libuv 线程池排队,文件数量受 maxFiles 约束)
const stats = await Promise.all(rels.map((rel) => stat(join(root, rel))))
const files = new Map<string, number>()
rels.forEach((rel, i) => files.set(rel, stats[i].size))
return { files, truncated, total }
}
/** 读取文件头部指定字节数(近似判定采样) */
async function readHead(path: string, bytes: number): Promise<Buffer> {
const fh = await open(path, 'r')
try {
const buf = Buffer.alloc(bytes)
const { bytesRead } = await fh.read(buf, 0, bytes, 0)
return buf.subarray(0, bytesRead)
} finally {
await fh.close()
}
}
/**
* 对比两个文件夹:按相对路径对齐条目并判定内容异同。
* 判定规则:单侧缺失 → only;大小不同 → different
* 大小相同且 ≤ maxContentBytes → 全量字节比对;超过上限 → 头部 8KB 采样近似判定。
* 目录不存在/不可读时抛出异常,由 IPC 调用方转为错误结果。
*/
export async function scanFolders(
leftDir: string,
rightDir: string,
options: ScanOptions = {}
): Promise<ScanResult> {
const maxFiles = options.maxFiles ?? FOLDER_MAX_FILES
const maxContentBytes = options.maxContentBytes ?? FOLDER_MAX_CONTENT_BYTES
const left = await listFiles(leftDir, maxFiles)
const right = await listFiles(rightDir, maxFiles)
const rels = [...new Set([...left.files.keys(), ...right.files.keys()])].sort()
const entries: FolderEntry[] = []
for (const rel of rels) {
const lSize = left.files.get(rel)
const rSize = right.files.get(rel)
if (lSize === undefined) {
entries.push({ rel, status: 'right-only', leftSize: null, rightSize: rSize ?? null })
} else if (rSize === undefined) {
entries.push({ rel, status: 'left-only', leftSize: lSize, rightSize: null })
} else if (lSize !== rSize) {
entries.push({ rel, status: 'different', leftSize: lSize, rightSize: rSize })
} else if (lSize <= maxContentBytes) {
const lBuf = await readFile(join(leftDir, rel))
const rBuf = await readFile(join(rightDir, rel))
entries.push(
lBuf.equals(rBuf)
? { rel, status: 'same', leftSize: lSize, rightSize: rSize }
: { rel, status: 'different', leftSize: lSize, rightSize: rSize }
)
} else {
// 超过全量比对上限:头部采样近似判定,结果带 approximate 标注
const lHead = await readHead(join(leftDir, rel), SAMPLE_BYTES)
const rHead = await readHead(join(rightDir, rel), SAMPLE_BYTES)
entries.push(
lHead.equals(rHead)
? { rel, status: 'same', leftSize: lSize, rightSize: rSize, approximate: true }
: { rel, status: 'different', leftSize: lSize, rightSize: rSize }
)
}
}
return { entries, truncated: left.truncated || right.truncated, total: Math.max(left.total, right.total) }
}