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Add Reader class and refactor shield sync (#471)
* Add Reader class and refactor shield sync * Comment --------- Co-authored-by: Alessandro Rezzi <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| export class Reader { | ||
| #i = 0; | ||
| #maxBytes = 0; | ||
| #availableBytes; | ||
| #done = false; | ||
| /** | ||
| * @type{()=>{} | null} Called when bytes are available. | ||
| * There can't be more than 1 awaiter | ||
| */ | ||
| #awaiter = null; | ||
|
|
||
| /** | ||
| * @returns {number} Content length if available, or an estimante | ||
| */ | ||
| get contentLength() { | ||
| return this.#availableBytes.length; | ||
| } | ||
|
|
||
| /** | ||
| * @returns {number} Number or bytes read | ||
| */ | ||
| get readBytes() { | ||
| return this.#i; | ||
| } | ||
| /** | ||
| * @param | ||
| */ | ||
| constructor(req) { | ||
| this.#availableBytes = new Uint8Array( | ||
| req.headers?.get('Content-Length') || 1024 | ||
| ); | ||
| const stream = req.body.getReader(); | ||
| (async () => { | ||
| while (true) { | ||
| const { done, value } = await stream.read(); | ||
| if (value) { | ||
| this.#appendBytes(value); | ||
| } | ||
| if (done) { | ||
| this.#done = true; | ||
| break; | ||
| } | ||
| } | ||
| })(); | ||
| } | ||
|
|
||
| #resizeArray(newLength) { | ||
| if (newLength <= this.#availableBytes.length) { | ||
| throw new Error( | ||
| 'New length must be greater than the current length.' | ||
| ); | ||
| } | ||
|
|
||
| const newArray = new Uint8Array(newLength); | ||
| newArray.set(this.#availableBytes); | ||
| this.#availableBytes = newArray; | ||
| } | ||
|
|
||
| #appendBytes(bytes) { | ||
| // If we have content-length, there should never be a need to | ||
| // resize | ||
| if (bytes.length + this.#maxBytes > this.#availableBytes.length) { | ||
| this.#resizeArray((bytes.length + this.#maxBytes) * 2); | ||
| } | ||
|
|
||
| this.#availableBytes.set(bytes, this.#maxBytes); | ||
| this.#maxBytes += bytes.length; | ||
| // Notify the awaiter if there is one | ||
| if (this.#awaiter) this.#awaiter(); | ||
| } | ||
|
|
||
| /** | ||
| * @param{number} byteLength | ||
| * @returns {Promise<Uint8Array | null>} bytes or null if there are no more bytes | ||
| */ | ||
| async read(byteLength) { | ||
| if (this.#awaiter) throw new Error('Called read more than once'); | ||
| while (true) { | ||
| if (this.#maxBytes - this.#i >= byteLength) { | ||
| this.#awaiter = null; | ||
| // We have enough bytes to respond | ||
| const res = this.#availableBytes.subarray( | ||
| this.#i, | ||
| this.#i + byteLength | ||
| ); | ||
| this.#i += byteLength; | ||
| return res; | ||
| } | ||
|
|
||
| // There are no more bytes to await, so we can return null | ||
| if (this.#done) return null; | ||
| // If we didn't respond, wait for the next batch of bytes, then try again | ||
| await new Promise((res) => { | ||
| this.#awaiter = res; | ||
| }); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| import { describe, it, expect } from 'vitest'; | ||
| import { Reader } from '../../scripts/reader.js'; | ||
|
|
||
| function createMockStream(chunks, contentLength = null) { | ||
| let i = 0; | ||
| return { | ||
| headers: { | ||
| get: (key) => (key === 'Content-Length' ? contentLength : null), | ||
| }, | ||
| body: { | ||
| getReader: () => { | ||
| return { | ||
| read: async () => { | ||
| if (i < chunks.length) { | ||
| const value = chunks[i]; | ||
| i++; | ||
| return { done: false, value }; | ||
| } | ||
| return { done: true, value: null }; | ||
| }, | ||
| }; | ||
| }, | ||
| }, | ||
| }; | ||
| } | ||
|
|
||
| describe('Reader without content length', () => { | ||
| it('should read bytes correctly when available', async () => { | ||
| const mockStream = createMockStream([ | ||
| new Uint8Array([1, 2, 3, 4]), | ||
| new Uint8Array([5, 6, 7, 8]), | ||
| ]); | ||
|
|
||
| const reader = new Reader(mockStream); | ||
|
|
||
| const result1 = await reader.read(4); | ||
| expect(result1).toEqual(new Uint8Array([1, 2, 3, 4])); | ||
|
|
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| const result2 = await reader.read(4); | ||
| expect(result2).toEqual(new Uint8Array([5, 6, 7, 8])); | ||
|
|
||
| // Reads after the stream is done should yield null | ||
| expect(await reader.read(10)).toBe(null); | ||
| }); | ||
|
|
||
| it('should wait for more bytes if not enough are available', async () => { | ||
| const mockStream = createMockStream([ | ||
| new Uint8Array([1, 2, 3]), | ||
| new Uint8Array([4, 5, 6]), | ||
| ]); | ||
|
|
||
| const reader = new Reader(mockStream); | ||
|
|
||
| const result = await reader.read(6); | ||
| expect(result).toEqual(new Uint8Array([1, 2, 3, 4, 5, 6])); | ||
| // Reads after the stream is done should yield null | ||
| expect(await reader.read(1)).toBe(null); | ||
| }); | ||
|
|
||
| it('should throw an error if read is called multiple times concurrently', async () => { | ||
| const mockStream = createMockStream([new Uint8Array([1, 2, 3])]); | ||
|
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| const reader = new Reader(mockStream); | ||
|
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| const read1 = reader.read(2); | ||
| const read2 = reader.read(2); | ||
|
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| await expect(read2).rejects.toThrow('Called read more than once'); | ||
| await expect(read1).resolves.toEqual(new Uint8Array([1, 2])); | ||
| }); | ||
|
|
||
| it('should handle reading less than available bytes', async () => { | ||
| const mockStream = createMockStream([new Uint8Array([1, 2, 3, 4, 5])]); | ||
|
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| const reader = new Reader(mockStream); | ||
|
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| const result1 = await reader.read(3); | ||
| expect(result1).toEqual(new Uint8Array([1, 2, 3])); | ||
|
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| const result2 = await reader.read(2); | ||
| expect(result2).toEqual(new Uint8Array([4, 5])); | ||
| }); | ||
| }); | ||
|
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||
| describe('Reader with Content-Length', () => { | ||
| it('should initialize buffer size based on Content-Length header', async () => { | ||
| const mockStream = createMockStream([], 2048); | ||
| const reader = new Reader(mockStream); | ||
|
|
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| // Read some bytes to indirectly validate initialization | ||
| const readPromise = reader.read(0); // No bytes to read, but ensures no errors | ||
| await expect(readPromise).resolves.toEqual(new Uint8Array(0)); | ||
| }); | ||
|
|
||
| it('should work if Content-Length is not set', async () => { | ||
| const mockStream = createMockStream([]); | ||
| const reader = new Reader(mockStream); | ||
|
|
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| // Read some bytes to validate no Content-Length doesn't break initialization | ||
| const readPromise = reader.read(0); | ||
| await expect(readPromise).resolves.toEqual(new Uint8Array(0)); | ||
| }); | ||
|
|
||
| it('should handle reading bytes when Content-Length is specified', async () => { | ||
| const mockStream = createMockStream( | ||
| [new Uint8Array([1, 2, 3, 4])], | ||
| 2048 // Content-Length | ||
| ); | ||
|
|
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| const reader = new Reader(mockStream); | ||
|
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| const result = await reader.read(4); | ||
| expect(result).toEqual(new Uint8Array([1, 2, 3, 4])); | ||
| }); | ||
|
|
||
| it('should resize the buffer if more bytes are received than Content-Length', async () => { | ||
| const mockStream = createMockStream( | ||
| [new Uint8Array([1, 2, 3, 4]), new Uint8Array([5, 6, 7, 8])], | ||
| 4 // Content-Length is smaller than total bytes received | ||
| ); | ||
|
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| const reader = new Reader(mockStream); | ||
|
|
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| const result1 = await reader.read(4); | ||
| expect(result1).toEqual(new Uint8Array([1, 2, 3, 4])); | ||
|
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| const result2 = await reader.read(4); | ||
| expect(result2).toEqual(new Uint8Array([5, 6, 7, 8])); | ||
| }); | ||
| }); |