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feat(js-sdk): expose E2B_ENVD_CONNECTIONS env var for file REST API connection limit #1506

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feat(js-sdk): expose E2B_ENVD_CONNECTIONS env var for file REST API connection limit #1506

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2916e3e
feat(js-sdk): expose E2B_ENVD_CONNECTIONS env var for file REST API c…
adababys Jun 30, 2026
477d78b
chore: add changeset for E2B_ENVD_CONNECTIONS env var
adababys Jun 30, 2026
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5 changes: 5 additions & 0 deletions .changeset/envd-connection-limit-env-var.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"e2b": patch
---

Expose `E2B_ENVD_CONNECTIONS` environment variable to configure the envd REST file API connection pool limit (default remains 10). Previously the connection count was hardcoded with no runtime override, unlike the RPC transport which already supported `E2B_ENVD_RPC_CONNECTIONS`.
10 changes: 8 additions & 2 deletions packages/js-sdk/src/envd/http2.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -90,9 +90,8 @@ export function createEnvdFetch(proxy?: string): typeof fetch {
return cached
}

// Keep one origin connection for short envd REST calls. If ALPN falls back
// to h1, this favors connection pressure over per-sandbox throughput.
const envdFetch = createEnvdFetchForRuntime(runtime, {
connectionLimit: getEnvdConnectionLimit(),
inflightLimit: getEnvdInflightLimit(),
proxy,
})
Expand All @@ -119,6 +118,13 @@ export function createEnvdRpcFetch(proxy?: string): typeof fetch {
return envdRpcFetch
}

export function getEnvdConnectionLimit(): number {
return parsePositiveIntEnv(
'E2B_ENVD_CONNECTIONS',
DEFAULT_ENVD_CONNECTION_LIMIT
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)
}

export function getEnvdRpcConnectionLimit(): number {
return parsePositiveIntEnv(
'E2B_ENVD_RPC_CONNECTIONS',
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17 changes: 17 additions & 0 deletions packages/js-sdk/tests/envd/http2.test.ts
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Expand Up @@ -5,6 +5,7 @@ afterEach(() => {
vi.resetModules()
vi.doUnmock('undici')
vi.doUnmock('../../src/utils')
delete process.env.E2B_ENVD_CONNECTIONS
delete process.env.E2B_ENVD_RPC_CONNECTIONS
delete process.env.E2B_ENVD_INFLIGHT_REQUESTS
delete process.env.E2B_ENVD_RPC_INFLIGHT_REQUESTS
Expand Down Expand Up @@ -158,6 +159,22 @@ test('can create a bounded dispatcher for RPC streams', async () => {
expect(agents).toEqual([{ allowH2: true, connections: 100 }])
})

test('reads envd connection limit from env', async () => {
process.env.E2B_ENVD_CONNECTIONS = '50'

const { getEnvdConnectionLimit } = await import('../../src/envd/http2')

expect(getEnvdConnectionLimit()).toBe(50)
})

test('getEnvdConnectionLimit throws on malformed env value', async () => {
process.env.E2B_ENVD_CONNECTIONS = 'bogus'

const { getEnvdConnectionLimit } = await import('../../src/envd/http2')

expect(() => getEnvdConnectionLimit()).toThrow(/E2B_ENVD_CONNECTIONS/)
})

test('reads RPC stream dispatcher connection limit from env', async () => {
process.env.E2B_ENVD_RPC_CONNECTIONS = '200'

Expand Down