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Use chunked transfer encoding for tar uploads #1118

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Merged
mishushakov merged 2 commits into from
Feb 6, 2026
+10 −23
Merged

Use chunked transfer encoding for tar uploads #1118

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884eb81
refactor: Use chunked transfer encoding for tar uploads
mishushakov Feb 6, 2026
0ff7ad3
chore: Add changeset for chunked upload
mishushakov Feb 6, 2026
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5 changes: 5 additions & 0 deletions .changeset/chunked-upload.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"e2b": patch
---

Use chunked transfer encoding for tar uploads to reduce memory usage
5 changes: 1 addition & 4 deletions packages/js-sdk/src/template/buildApi.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -111,7 +111,7 @@ export async function uploadFile(
const { fileName, url, fileContextPath, ignorePatterns, resolveSymlinks } =
options
try {
const { contentLength, uploadStream } = await tarFileStreamUpload(
const uploadStream = await tarFileStreamUpload(
fileName,
fileContextPath,
ignorePatterns,
Expand All @@ -123,9 +123,6 @@ export async function uploadFile(
method: 'PUT',
// @ts-expect-error
body: uploadStream,
headers: {
'Content-Length': contentLength.toString(),
},
duplex: 'half',
})

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23 changes: 4 additions & 19 deletions packages/js-sdk/src/template/utils.ts
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Expand Up @@ -373,7 +373,7 @@ export async function tarFileStream(
// gzip.portable ensures deterministic gzip header without affecting file modes
return create(
{
gzip: { portable: true },
gzip: true,
cwd: fileContextPath,
follow: resolveSymlinks,
noDirRecurse: true,
Expand All @@ -383,40 +383,25 @@ export async function tarFileStream(
}

/**
* Create a tar stream and calculate its compressed size for upload.
* Create a tar stream for upload using chunked transfer encoding.
*
* @param fileName Glob pattern for files to include
* @param fileContextPath Base directory for resolving file paths
* @param resolveSymlinks Whether to follow symbolic links
* @returns Object containing the content length and upload stream
* @returns A readable stream of the gzipped tar archive
*/
export async function tarFileStreamUpload(
fileName: string,
fileContextPath: string,
ignorePatterns: string[],
resolveSymlinks: boolean
) {
// First pass: calculate the compressed size
const sizeCalculationStream = await tarFileStream(
return tarFileStream(
fileName,
fileContextPath,
ignorePatterns,
resolveSymlinks
)
let contentLength = 0
for await (const chunk of sizeCalculationStream as unknown as AsyncIterable<Buffer>) {
contentLength += chunk.length
}

return {
contentLength,
uploadStream: await tarFileStream(
fileName,
fileContextPath,
ignorePatterns,
resolveSymlinks
),
}
}

/**
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