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feat(node-fetch):
WritableStream, TransformStream & `CompressionS…
…tream` (#1495)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| --- | ||
| '@whatwg-node/server-plugin-cookies': patch | ||
| '@whatwg-node/node-fetch': patch | ||
| '@whatwg-node/server': patch | ||
| '@whatwg-node/fetch': patch | ||
| --- | ||
|
|
||
| Implement \`CompressionStream\`, \`WritableStream\` and \`TransformStream\` |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| import { createBrotliCompress, createDeflate, createDeflateRaw, createGzip } from 'node:zlib'; | ||
| import { PonyfillTransformStream } from './TransformStream.js'; | ||
|
|
||
| export type PonyfillCompressionFormat = | ||
| | 'x-gzip' | ||
| | 'gzip' | ||
| | 'x-deflate' | ||
| | 'deflate' | ||
| | 'deflate-raw' | ||
| | 'br'; | ||
|
|
||
| export class PonyfillCompressionStream | ||
| extends PonyfillTransformStream | ||
| implements CompressionStream | ||
| { | ||
| constructor(compressionFormat: PonyfillCompressionFormat) { | ||
| switch (compressionFormat) { | ||
| case 'x-gzip': | ||
| case 'gzip': | ||
| super(createGzip()); | ||
| break; | ||
| case 'x-deflate': | ||
| case 'deflate': | ||
| super(createDeflate()); | ||
| break; | ||
| case 'deflate-raw': | ||
| super(createDeflateRaw()); | ||
| break; | ||
| case 'br': | ||
| super(createBrotliCompress()); | ||
| break; | ||
| default: | ||
| throw new Error(`Unsupported compression format: ${compressionFormat}`); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| import { createBrotliDecompress, createGunzip, createInflate, createInflateRaw } from 'node:zlib'; | ||
| import { PonyfillCompressionFormat } from './CompressionStream.js'; | ||
| import { PonyfillTransformStream } from './TransformStream.js'; | ||
|
|
||
| export class PonyfillDecompressionStream | ||
| extends PonyfillTransformStream | ||
| implements DecompressionStream | ||
| { | ||
| constructor(compressionFormat: PonyfillCompressionFormat) { | ||
| switch (compressionFormat) { | ||
| case 'x-gzip': | ||
| case 'gzip': | ||
| super(createGunzip()); | ||
| break; | ||
| case 'x-deflate': | ||
| case 'deflate': | ||
| super(createInflate()); | ||
| break; | ||
| case 'deflate-raw': | ||
| super(createInflateRaw()); | ||
| break; | ||
| case 'br': | ||
| super(createBrotliDecompress()); | ||
| break; | ||
| default: | ||
| throw new Error(`Unsupported compression format: ${compressionFormat}`); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| import { Transform } from 'node:stream'; | ||
| import { PonyfillReadableStream } from './ReadableStream.js'; | ||
| import { PonyfillWritableStream } from './WritableStream.js'; | ||
|
|
||
| export class PonyfillTransformStream<I = any, O = any> implements TransformStream<I, O> { | ||
| transform: Transform; | ||
| writable: PonyfillWritableStream<I>; | ||
| readable: PonyfillReadableStream<O>; | ||
|
|
||
| constructor(transformer?: Transformer<I, O> | Transform) { | ||
| if (transformer instanceof Transform) { | ||
| this.transform = transformer; | ||
| } else if (transformer) { | ||
| const controller: TransformStreamDefaultController = { | ||
| enqueue(chunk: O) { | ||
| transform.push(chunk); | ||
| }, | ||
| error(reason: any) { | ||
| transform.destroy(reason); | ||
| }, | ||
| terminate() { | ||
| transform.end(); | ||
| }, | ||
| get desiredSize() { | ||
| return transform.writableLength; | ||
| }, | ||
| }; | ||
| const transform = new Transform({ | ||
| read() {}, | ||
| write(chunk: I, _encoding: BufferEncoding, callback: (error?: Error | null) => void) { | ||
| try { | ||
| const result = transformer.transform?.(chunk, controller); | ||
| if (result instanceof Promise) { | ||
| result.then( | ||
| () => { | ||
| callback(); | ||
| }, | ||
| err => { | ||
| callback(err); | ||
| }, | ||
| ); | ||
| } else { | ||
| callback(); | ||
| } | ||
| } catch (err) { | ||
| callback(err as Error); | ||
| } | ||
| }, | ||
| final(callback: (error?: Error | null) => void) { | ||
| try { | ||
| const result = transformer.flush?.(controller); | ||
| if (result instanceof Promise) { | ||
| result.then( | ||
| () => { | ||
| callback(); | ||
| }, | ||
| err => { | ||
| callback(err); | ||
| }, | ||
| ); | ||
| } else { | ||
| callback(); | ||
| } | ||
| } catch (err) { | ||
| callback(err as Error); | ||
| } | ||
| }, | ||
| }); | ||
| this.transform = transform; | ||
| } else { | ||
| this.transform = new Transform(); | ||
| } | ||
| this.writable = new PonyfillWritableStream(this.transform); | ||
| this.readable = new PonyfillReadableStream(this.transform); | ||
| } | ||
| } |
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