source: trip-planner-front/node_modules/webpack/lib/serialization/FileMiddleware.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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[6a3a178]1/*
2 MIT License http://www.opensource.org/licenses/mit-license.php
3*/
4
5"use strict";
6
7const { constants } = require("buffer");
8const { pipeline } = require("stream");
9const {
10 createBrotliCompress,
11 createBrotliDecompress,
12 createGzip,
13 createGunzip,
14 constants: zConstants
15} = require("zlib");
16const createHash = require("../util/createHash");
17const { dirname, join, mkdirp } = require("../util/fs");
18const memoize = require("../util/memoize");
19const SerializerMiddleware = require("./SerializerMiddleware");
20
21/** @typedef {import("../util/fs").IntermediateFileSystem} IntermediateFileSystem */
22/** @typedef {import("./types").BufferSerializableType} BufferSerializableType */
23
24/*
25Format:
26
27File -> Header Section*
28
29Version -> u32
30AmountOfSections -> u32
31SectionSize -> i32 (if less than zero represents lazy value)
32
33Header -> Version AmountOfSections SectionSize*
34
35Buffer -> n bytes
36Section -> Buffer
37
38*/
39
40// "wpc" + 1 in little-endian
41const VERSION = 0x01637077;
42const hashForName = buffers => {
43 const hash = createHash("md4");
44 for (const buf of buffers) hash.update(buf);
45 return /** @type {string} */ (hash.digest("hex"));
46};
47
48const COMPRESSION_CHUNK_SIZE = 100 * 1024 * 1024;
49const DECOMPRESSION_CHUNK_SIZE = 100 * 1024 * 1024;
50
51const writeUInt64LE = Buffer.prototype.writeBigUInt64LE
52 ? (buf, value, offset) => {
53 buf.writeBigUInt64LE(BigInt(value), offset);
54 }
55 : (buf, value, offset) => {
56 const low = value % 0x100000000;
57 const high = (value - low) / 0x100000000;
58 buf.writeUInt32LE(low, offset);
59 buf.writeUInt32LE(high, offset + 4);
60 };
61
62const readUInt64LE = Buffer.prototype.readBigUInt64LE
63 ? (buf, offset) => {
64 return Number(buf.readBigUInt64LE(offset));
65 }
66 : (buf, offset) => {
67 const low = buf.readUInt32LE(offset);
68 const high = buf.readUInt32LE(offset + 4);
69 return high * 0x100000000 + low;
70 };
71
72/**
73 * @typedef {Object} SerializeResult
74 * @property {string | false} name
75 * @property {number} size
76 * @property {Promise=} backgroundJob
77 */
78
79/**
80 * @param {FileMiddleware} middleware this
81 * @param {BufferSerializableType[] | Promise<BufferSerializableType[]>} data data to be serialized
82 * @param {string | boolean} name file base name
83 * @param {function(string | false, Buffer[]): Promise<void>} writeFile writes a file
84 * @returns {Promise<SerializeResult>} resulting file pointer and promise
85 */
86const serialize = async (middleware, data, name, writeFile) => {
87 /** @type {(Buffer[] | Buffer | SerializeResult | Promise<SerializeResult>)[]} */
88 const processedData = [];
89 /** @type {WeakMap<SerializeResult, function(): any | Promise<any>>} */
90 const resultToLazy = new WeakMap();
91 /** @type {Buffer[]} */
92 let lastBuffers = undefined;
93 for (const item of await data) {
94 if (typeof item === "function") {
95 if (!SerializerMiddleware.isLazy(item))
96 throw new Error("Unexpected function");
97 if (!SerializerMiddleware.isLazy(item, middleware)) {
98 throw new Error(
99 "Unexpected lazy value with non-this target (can't pass through lazy values)"
100 );
101 }
102 lastBuffers = undefined;
103 const serializedInfo = SerializerMiddleware.getLazySerializedValue(item);
104 if (serializedInfo) {
105 if (typeof serializedInfo === "function") {
106 throw new Error(
107 "Unexpected lazy value with non-this target (can't pass through lazy values)"
108 );
109 } else {
110 processedData.push(serializedInfo);
111 }
112 } else {
113 const content = item();
114 if (content) {
115 const options = SerializerMiddleware.getLazyOptions(item);
116 processedData.push(
117 serialize(
118 middleware,
119 content,
120 (options && options.name) || true,
121 writeFile
122 ).then(result => {
123 /** @type {any} */ (item).options.size = result.size;
124 resultToLazy.set(result, item);
125 return result;
126 })
127 );
128 } else {
129 throw new Error(
130 "Unexpected falsy value returned by lazy value function"
131 );
132 }
133 }
134 } else if (item) {
135 if (lastBuffers) {
136 lastBuffers.push(item);
137 } else {
138 lastBuffers = [item];
139 processedData.push(lastBuffers);
140 }
141 } else {
142 throw new Error("Unexpected falsy value in items array");
143 }
144 }
145 /** @type {Promise<any>[]} */
146 const backgroundJobs = [];
147 const resolvedData = (
148 await Promise.all(
149 /** @type {Promise<Buffer[] | Buffer | SerializeResult>[]} */ (
150 processedData
151 )
152 )
153 ).map(item => {
154 if (Array.isArray(item) || Buffer.isBuffer(item)) return item;
155
156 backgroundJobs.push(item.backgroundJob);
157 // create pointer buffer from size and name
158 const name = /** @type {string} */ (item.name);
159 const nameBuffer = Buffer.from(name);
160 const buf = Buffer.allocUnsafe(8 + nameBuffer.length);
161 writeUInt64LE(buf, item.size, 0);
162 nameBuffer.copy(buf, 8, 0);
163 const lazy = resultToLazy.get(item);
164 SerializerMiddleware.setLazySerializedValue(lazy, buf);
165 return buf;
166 });
167 const lengths = [];
168 for (const item of resolvedData) {
169 if (Array.isArray(item)) {
170 let l = 0;
171 for (const b of item) l += b.length;
172 while (l > 0x7fffffff) {
173 lengths.push(0x7fffffff);
174 l -= 0x7fffffff;
175 }
176 lengths.push(l);
177 } else if (item) {
178 lengths.push(-item.length);
179 } else {
180 throw new Error("Unexpected falsy value in resolved data " + item);
181 }
182 }
183 const header = Buffer.allocUnsafe(8 + lengths.length * 4);
184 header.writeUInt32LE(VERSION, 0);
185 header.writeUInt32LE(lengths.length, 4);
186 for (let i = 0; i < lengths.length; i++) {
187 header.writeInt32LE(lengths[i], 8 + i * 4);
188 }
189 const buf = [header];
190 for (const item of resolvedData) {
191 if (Array.isArray(item)) {
192 for (const b of item) buf.push(b);
193 } else if (item) {
194 buf.push(item);
195 }
196 }
197 if (name === true) {
198 name = hashForName(buf);
199 }
200 backgroundJobs.push(writeFile(name, buf));
201 let size = 0;
202 for (const b of buf) size += b.length;
203 return {
204 size,
205 name,
206 backgroundJob:
207 backgroundJobs.length === 1
208 ? backgroundJobs[0]
209 : Promise.all(backgroundJobs)
210 };
211};
212
213/**
214 * @param {FileMiddleware} middleware this
215 * @param {string | false} name filename
216 * @param {function(string | false): Promise<Buffer[]>} readFile read content of a file
217 * @returns {Promise<BufferSerializableType[]>} deserialized data
218 */
219const deserialize = async (middleware, name, readFile) => {
220 const contents = await readFile(name);
221 if (contents.length === 0) throw new Error("Empty file " + name);
222 let contentsIndex = 0;
223 let contentItem = contents[0];
224 let contentItemLength = contentItem.length;
225 let contentPosition = 0;
226 if (contentItemLength === 0) throw new Error("Empty file " + name);
227 const nextContent = () => {
228 contentsIndex++;
229 contentItem = contents[contentsIndex];
230 contentItemLength = contentItem.length;
231 contentPosition = 0;
232 };
233 const ensureData = n => {
234 if (contentPosition === contentItemLength) {
235 nextContent();
236 }
237 while (contentItemLength - contentPosition < n) {
238 const remaining = contentItem.slice(contentPosition);
239 let lengthFromNext = n - remaining.length;
240 const buffers = [remaining];
241 for (let i = contentsIndex + 1; i < contents.length; i++) {
242 const l = contents[i].length;
243 if (l > lengthFromNext) {
244 buffers.push(contents[i].slice(0, lengthFromNext));
245 contents[i] = contents[i].slice(lengthFromNext);
246 lengthFromNext = 0;
247 break;
248 } else {
249 buffers.push(contents[i]);
250 contentsIndex = i;
251 lengthFromNext -= l;
252 }
253 }
254 if (lengthFromNext > 0) throw new Error("Unexpected end of data");
255 contentItem = Buffer.concat(buffers, n);
256 contentItemLength = n;
257 contentPosition = 0;
258 }
259 };
260 const readUInt32LE = () => {
261 ensureData(4);
262 const value = contentItem.readUInt32LE(contentPosition);
263 contentPosition += 4;
264 return value;
265 };
266 const readInt32LE = () => {
267 ensureData(4);
268 const value = contentItem.readInt32LE(contentPosition);
269 contentPosition += 4;
270 return value;
271 };
272 const readSlice = l => {
273 ensureData(l);
274 if (contentPosition === 0 && contentItemLength === l) {
275 const result = contentItem;
276 if (contentsIndex + 1 < contents.length) {
277 nextContent();
278 } else {
279 contentPosition = l;
280 }
281 return result;
282 }
283 const result = contentItem.slice(contentPosition, contentPosition + l);
284 contentPosition += l;
285 // we clone the buffer here to allow the original content to be garbage collected
286 return l * 2 < contentItem.buffer.byteLength ? Buffer.from(result) : result;
287 };
288 const version = readUInt32LE();
289 if (version !== VERSION) {
290 throw new Error("Invalid file version");
291 }
292 const sectionCount = readUInt32LE();
293 const lengths = [];
294 let lastLengthPositive = false;
295 for (let i = 0; i < sectionCount; i++) {
296 const value = readInt32LE();
297 const valuePositive = value >= 0;
298 if (lastLengthPositive && valuePositive) {
299 lengths[lengths.length - 1] += value;
300 } else {
301 lengths.push(value);
302 lastLengthPositive = valuePositive;
303 }
304 }
305 const result = [];
306 for (let length of lengths) {
307 if (length < 0) {
308 const slice = readSlice(-length);
309 const size = Number(readUInt64LE(slice, 0));
310 const nameBuffer = slice.slice(8);
311 const name = nameBuffer.toString();
312 result.push(
313 SerializerMiddleware.createLazy(
314 memoize(() => deserialize(middleware, name, readFile)),
315 middleware,
316 {
317 name,
318 size
319 },
320 slice
321 )
322 );
323 } else {
324 if (contentPosition === contentItemLength) {
325 nextContent();
326 } else if (contentPosition !== 0) {
327 if (length <= contentItemLength - contentPosition) {
328 result.push(
329 Buffer.from(
330 contentItem.buffer,
331 contentItem.byteOffset + contentPosition,
332 length
333 )
334 );
335 contentPosition += length;
336 length = 0;
337 } else {
338 const l = contentItemLength - contentPosition;
339 result.push(
340 Buffer.from(
341 contentItem.buffer,
342 contentItem.byteOffset + contentPosition,
343 l
344 )
345 );
346 length -= l;
347 contentPosition = contentItemLength;
348 }
349 } else {
350 if (length >= contentItemLength) {
351 result.push(contentItem);
352 length -= contentItemLength;
353 contentPosition = contentItemLength;
354 } else {
355 result.push(
356 Buffer.from(contentItem.buffer, contentItem.byteOffset, length)
357 );
358 contentPosition += length;
359 length = 0;
360 }
361 }
362 while (length > 0) {
363 nextContent();
364 if (length >= contentItemLength) {
365 result.push(contentItem);
366 length -= contentItemLength;
367 contentPosition = contentItemLength;
368 } else {
369 result.push(
370 Buffer.from(contentItem.buffer, contentItem.byteOffset, length)
371 );
372 contentPosition += length;
373 length = 0;
374 }
375 }
376 }
377 }
378 return result;
379};
380
381/**
382 * @typedef {BufferSerializableType[]} DeserializedType
383 * @typedef {true} SerializedType
384 * @extends {SerializerMiddleware<DeserializedType, SerializedType>}
385 */
386class FileMiddleware extends SerializerMiddleware {
387 /**
388 * @param {IntermediateFileSystem} fs filesystem
389 */
390 constructor(fs) {
391 super();
392 this.fs = fs;
393 }
394 /**
395 * @param {DeserializedType} data data
396 * @param {Object} context context object
397 * @returns {SerializedType|Promise<SerializedType>} serialized data
398 */
399 serialize(data, context) {
400 const { filename, extension = "" } = context;
401 return new Promise((resolve, reject) => {
402 mkdirp(this.fs, dirname(this.fs, filename), err => {
403 if (err) return reject(err);
404
405 // It's important that we don't touch existing files during serialization
406 // because serialize may read existing files (when deserializing)
407 const allWrittenFiles = new Set();
408 const writeFile = async (name, content) => {
409 const file = name
410 ? join(this.fs, filename, `../${name}${extension}`)
411 : filename;
412 await new Promise((resolve, reject) => {
413 let stream = this.fs.createWriteStream(file + "_");
414 let compression;
415 if (file.endsWith(".gz")) {
416 compression = createGzip({
417 chunkSize: COMPRESSION_CHUNK_SIZE,
418 level: zConstants.Z_BEST_SPEED
419 });
420 } else if (file.endsWith(".br")) {
421 compression = createBrotliCompress({
422 chunkSize: COMPRESSION_CHUNK_SIZE,
423 params: {
424 [zConstants.BROTLI_PARAM_MODE]: zConstants.BROTLI_MODE_TEXT,
425 [zConstants.BROTLI_PARAM_QUALITY]: 2,
426 [zConstants.BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING]: true,
427 [zConstants.BROTLI_PARAM_SIZE_HINT]: content.reduce(
428 (size, b) => size + b.length,
429 0
430 )
431 }
432 });
433 }
434 if (compression) {
435 pipeline(compression, stream, reject);
436 stream = compression;
437 stream.on("finish", () => resolve());
438 } else {
439 stream.on("error", err => reject(err));
440 stream.on("finish", () => resolve());
441 }
442 for (const b of content) stream.write(b);
443 stream.end();
444 });
445 if (name) allWrittenFiles.add(file);
446 };
447
448 resolve(
449 serialize(this, data, false, writeFile).then(
450 async ({ backgroundJob }) => {
451 await backgroundJob;
452
453 // Rename the index file to disallow access during inconsistent file state
454 await new Promise(resolve =>
455 this.fs.rename(filename, filename + ".old", err => {
456 resolve();
457 })
458 );
459
460 // update all written files
461 await Promise.all(
462 Array.from(
463 allWrittenFiles,
464 file =>
465 new Promise((resolve, reject) => {
466 this.fs.rename(file + "_", file, err => {
467 if (err) return reject(err);
468 resolve();
469 });
470 })
471 )
472 );
473
474 // As final step automatically update the index file to have a consistent pack again
475 await new Promise(resolve => {
476 this.fs.rename(filename + "_", filename, err => {
477 if (err) return reject(err);
478 resolve();
479 });
480 });
481 return /** @type {true} */ (true);
482 }
483 )
484 );
485 });
486 });
487 }
488
489 /**
490 * @param {SerializedType} data data
491 * @param {Object} context context object
492 * @returns {DeserializedType|Promise<DeserializedType>} deserialized data
493 */
494 deserialize(data, context) {
495 const { filename, extension = "" } = context;
496 const readFile = name =>
497 new Promise((resolve, reject) => {
498 const file = name
499 ? join(this.fs, filename, `../${name}${extension}`)
500 : filename;
501 this.fs.stat(file, (err, stats) => {
502 if (err) {
503 reject(err);
504 return;
505 }
506 let remaining = /** @type {number} */ (stats.size);
507 let currentBuffer;
508 let currentBufferUsed;
509 const buf = [];
510 let decompression;
511 if (file.endsWith(".gz")) {
512 decompression = createGunzip({
513 chunkSize: DECOMPRESSION_CHUNK_SIZE
514 });
515 } else if (file.endsWith(".br")) {
516 decompression = createBrotliDecompress({
517 chunkSize: DECOMPRESSION_CHUNK_SIZE
518 });
519 }
520 if (decompression) {
521 let newResolve, newReject;
522 resolve(
523 Promise.all([
524 new Promise((rs, rj) => {
525 newResolve = rs;
526 newReject = rj;
527 }),
528 new Promise((resolve, reject) => {
529 decompression.on("data", chunk => buf.push(chunk));
530 decompression.on("end", () => resolve());
531 decompression.on("error", err => reject(err));
532 })
533 ]).then(() => buf)
534 );
535 resolve = newResolve;
536 reject = newReject;
537 }
538 this.fs.open(file, "r", (err, fd) => {
539 if (err) {
540 reject(err);
541 return;
542 }
543 const read = () => {
544 if (currentBuffer === undefined) {
545 currentBuffer = Buffer.allocUnsafeSlow(
546 Math.min(
547 constants.MAX_LENGTH,
548 remaining,
549 decompression ? DECOMPRESSION_CHUNK_SIZE : Infinity
550 )
551 );
552 currentBufferUsed = 0;
553 }
554 let readBuffer = currentBuffer;
555 let readOffset = currentBufferUsed;
556 let readLength = currentBuffer.length - currentBufferUsed;
557 // values passed to fs.read must be valid int32 values
558 if (readOffset > 0x7fffffff) {
559 readBuffer = currentBuffer.slice(readOffset);
560 readOffset = 0;
561 }
562 if (readLength > 0x7fffffff) {
563 readLength = 0x7fffffff;
564 }
565 this.fs.read(
566 fd,
567 readBuffer,
568 readOffset,
569 readLength,
570 null,
571 (err, bytesRead) => {
572 if (err) {
573 this.fs.close(fd, () => {
574 reject(err);
575 });
576 return;
577 }
578 currentBufferUsed += bytesRead;
579 remaining -= bytesRead;
580 if (currentBufferUsed === currentBuffer.length) {
581 if (decompression) {
582 decompression.write(currentBuffer);
583 } else {
584 buf.push(currentBuffer);
585 }
586 currentBuffer = undefined;
587 if (remaining === 0) {
588 if (decompression) {
589 decompression.end();
590 }
591 this.fs.close(fd, err => {
592 if (err) {
593 reject(err);
594 return;
595 }
596 resolve(buf);
597 });
598 return;
599 }
600 }
601 read();
602 }
603 );
604 };
605 read();
606 });
607 });
608 });
609 return deserialize(this, false, readFile);
610 }
611}
612
613module.exports = FileMiddleware;
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