v1rtl•13mo ago

"A fetch response body was created during the test" when invoking a PUT request in a test?

I'm writing a Deno library for uploading files on IPFS. The code is very simple:

export const uploadCar = async ({ file, url }) => {
  const res = await fetch(url, {
    method: 'PUT',
    body: file,
    headers: { 'x-amz-meta-import': 'car' },
  })

  return res.headers.get('x-amz-meta-cid')!
}

export const uploadCar = async ({ file, url }) => {
  const res = await fetch(url, {
    method: 'PUT',
    body: file,
    headers: { 'x-amz-meta-import': 'car' },
  })

  return res.headers.get('x-amz-meta-cid')!
}

And this is the test file I have:

import { CAREncoderStream, createFileEncoderStream } from 'https://esm.sh/ipfs-car@1.0.0'
import { CID } from 'https://esm.sh/multiformats@12.1.3/cid'

async function streamToBlob(stream: ReadableStream): Promise<Blob> {
  const reader = stream.getReader()
  const chunks: Uint8Array[] = []

  while (true) {
    const { done, value } = await reader.read()
    if (done) break
    chunks.push(value)
  }

  return new Blob(chunks, { type: 'application/octet-stream' })
}

describe('uploadCar', () => {
  it(
    'should upload a CAR file',
    async () => {
      const stream = createFileEncoderStream(new Blob(['Hello ipfs-car!']))
        .pipeThrough(
          new TransformStream(),
        )
        .pipeThrough(new CAREncoderStream([placeholderCID]))

      const blob = await streamToBlob(stream)

      const file = new File([blob], 'file.car')

      const cid = await uploadCar({ file, ...args })

      assertEquals(cid, 'bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi')
    },
  )
})

import { CAREncoderStream, createFileEncoderStream } from 'https://esm.sh/ipfs-car@1.0.0'
import { CID } from 'https://esm.sh/multiformats@12.1.3/cid'

async function streamToBlob(stream: ReadableStream): Promise<Blob> {
  const reader = stream.getReader()
  const chunks: Uint8Array[] = []

  while (true) {
    const { done, value } = await reader.read()
    if (done) break
    chunks.push(value)
  }

  return new Blob(chunks, { type: 'application/octet-stream' })
}

describe('uploadCar', () => {
  it(
    'should upload a CAR file',
    async () => {
      const stream = createFileEncoderStream(new Blob(['Hello ipfs-car!']))
        .pipeThrough(
          new TransformStream(),
        )
        .pipeThrough(new CAREncoderStream([placeholderCID]))

      const blob = await streamToBlob(stream)

      const file = new File([blob], 'file.car')

      const cid = await uploadCar({ file, ...args })

      assertEquals(cid, 'bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi')
    },
  )
})

When running this test this is what Im getting:

uploadCar ... should upload a CAR file => https://deno.land/std@0.207.0/testing/_test_suite.ts:323:15
error: Leaking resources:
  - A fetch response body (rid 18) was created during the test, but not consumed during the test. Consume or close the response body `ReadableStream`, e.g `await resp.text()` or `await resp.body.cancel()`.

uploadCar ... should upload a CAR file => https://deno.land/std@0.207.0/testing/_test_suite.ts:323:15
error: Leaking resources:
  - A fetch response body (rid 18) was created during the test, but not consumed during the test. Consume or close the response body `ReadableStream`, e.g `await resp.text()` or `await resp.body.cancel()`.

I couldn't find much info about the issue - what could be a possible fix?

2 Replies

marvinh.•13mo ago

This usually happens when you do something like this in the test:

const res = await fetch("..")
assertEquals(res.status, 200)

const res = await fetch("..")
assertEquals(res.status, 200)

There the response body is not consumed. The fix is to consume it by doing something like this.

const res = await fetch("..")
assertEquals(res.status, 200)
await res.text() // consume resposne body
// or
await res.body.cancel()

const res = await fetch("..")
assertEquals(res.status, 200)
await res.text() // consume resposne body
// or
await res.body.cancel()

v1rtlOP•13mo ago

What to do if I'm not returning a response? I tried changing the code to this:

      const res = await uploadCar({ bucketName: 'filebase-upload-tests', token: Deno.env.get('FILEBASE_TOKEN')!, file })

      assertEquals(res.headers.get('x-amz-meta-cid'), 'bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi')

      await res.body?.cancel()

      const res = await uploadCar({ bucketName: 'filebase-upload-tests', token: Deno.env.get('FILEBASE_TOKEN')!, file })

      assertEquals(res.headers.get('x-amz-meta-cid'), 'bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi')

      await res.body?.cancel()

It still errors the same way I made an ugly solution:

await res.body?.cancel()
const fetchResource = Object.keys(Deno.resources()).find((key) =>
  Deno.resources()[parseInt(key)] === 'fetchResponse'
)
Deno.close(parseInt(fetchResource!))

await res.body?.cancel()
const fetchResource = Object.keys(Deno.resources()).find((key) =>
  Deno.resources()[parseInt(key)] === 'fetchResponse'
)
Deno.close(parseInt(fetchResource!))