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Fix AbortError being triggered incorrectly on createApi endpoint timeout #4628

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andrejpavlovic
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…OUT_ERROR` instead of generic `AbortError`.
@andrejpavlovic andrejpavlovic force-pushed the fix/timeout-on-createApi-endpoint-should-throw-TIMEOUT_ERROR branch from b6c5d1f to d9a9106 Compare September 19, 2024 03:06
@phryneas
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Could you please explain the reasoning here a bit? It's not immediately obvious to me.

@andrejpavlovic
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Could you please explain the reasoning here a bit? It's not immediately obvious to me.

Sure thing! As I alluded to in #2915, the issue exists because of a bit of a race condition happening.

  1. When fetchBaseQuery times out, it triggers api.abort() on global abort controller (ie. on the one that is created inside createAsyncTrunk)
    setTimeout(() => {
    timedOut = true
    api.abort()
    }, timeout)
  2. That in turns rejects the abortPromise in createAsyncTrunk with the generic AbortError.
    const abortedPromise = new Promise<never>((_, reject) => {
    abortHandler = () => {
    reject({
    name: 'AbortError',
    message: abortReason || 'Aborted',
    })
    }
  3. Which then rejects the Promise.race promise here:
    finalAction = await Promise.race([
    abortedPromise,
    Promise.resolve(
    payloadCreator(arg, {
  4. And this rejection (the generic AbortError) gets returned by the createAsyncTrunk here:
    finalAction =
    err instanceof RejectWithValue
    ? rejected(null, requestId, arg, err.payload, err.meta)
    : rejected(err as any, requestId, arg)

So even though fetchBaseQuery would resolve to TIMEOUT_ERROR (see below), it wouldn't matter, because the global abortPromise would always resolve first.

} catch (e) {
return {
error: {
status: timedOut ? 'TIMEOUT_ERROR' : 'FETCH_ERROR',
error: String(e),

Since fetchBaseQuery is quite capable of resolving the timeout locally, there is no need to trigger the global abort inside of it.

The solution I applied was to create an AbortController inside of fetchBaseQuery that would handle the timeout locally, but would also abort if abort is triggered on the global signal:

let abortController: AbortController | undefined, signal = api.signal
if (timeout) {
abortController = new AbortController()
api.signal.addEventListener('abort', abortController.abort)
signal = abortController.signal
}

To sum it up, in this PR, we avoid the race condition in createAsyncThunk between 1. triggering global abort and 2. handling the timeout in fetchBaseQuery, by never triggering the global abort on timeout in the first place.

Of note: As far as I understand best practices for using AbortController, abort callback should not be passed to fetchBaseQuery in the first place, just the signal. I would go as far as suggest to remove passing this parameter:

@phryneas
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I see, thank you for the explanation.

It's a shame that AbortSignal.any is so new that we probably can't use it, or otherwise we could have done something much shorter like

diff --git a/packages/toolkit/src/query/fetchBaseQuery.ts b/packages/toolkit/src/query/fetchBaseQuery.ts
index 9dc14d97..f2a3b732 100644
--- a/packages/toolkit/src/query/fetchBaseQuery.ts
+++ b/packages/toolkit/src/query/fetchBaseQuery.ts
@@ -225,12 +225,8 @@ export function fetchBaseQuery({
       ...rest
     } = typeof arg == 'string' ? { url: arg } : arg

-    let abortController: AbortController | undefined, signal = api.signal
-    if (timeout) {
-      abortController = new AbortController()
-      api.signal.addEventListener('abort', abortController.abort)
-      signal = abortController.signal
-    }
+    const timeoutSignal = timeout ? AbortSignal.timeout(timeout) : undefined
+    const signal = timeoutSignal ? AbortSignal.any(api.signal, timeoutSignal) : api.signal

     let config: RequestInit = {
       ...baseFetchOptions,
@@ -277,27 +273,17 @@ export function fetchBaseQuery({
     const requestClone = new Request(url, config)
     meta = { request: requestClone }

-    let response,
-      timedOut = false,
-      timeoutId =
-        abortController &&
-        setTimeout(() => {
-          timedOut = true
-          abortController!.abort()
-        }, timeout)
+    let response
     try {
       response = await fetchFn(request)
     } catch (e) {
       return {
         error: {
-          status: timedOut ? 'TIMEOUT_ERROR' : 'FETCH_ERROR',
+          status: timeoutSignal?.aborted ? 'TIMEOUT_ERROR' : 'FETCH_ERROR',
           error: String(e),
         },
         meta,
       }
-    } finally {
-      if (timeoutId) clearTimeout(timeoutId)
-      abortController?.signal.removeEventListener('abort', abortController.abort)
     }
     const responseClone = response.clone()

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Looks good to me :)

@andrejpavlovic
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I see, thank you for the explanation.

It's a shame that AbortSignal.any is so new that we probably can't use it, or otherwise we could have done something much shorter like

diff --git a/packages/toolkit/src/query/fetchBaseQuery.ts b/packages/toolkit/src/query/fetchBaseQuery.ts
index 9dc14d97..f2a3b732 100644
--- a/packages/toolkit/src/query/fetchBaseQuery.ts
+++ b/packages/toolkit/src/query/fetchBaseQuery.ts
@@ -225,12 +225,8 @@ export function fetchBaseQuery({
       ...rest
     } = typeof arg == 'string' ? { url: arg } : arg

-    let abortController: AbortController | undefined, signal = api.signal
-    if (timeout) {
-      abortController = new AbortController()
-      api.signal.addEventListener('abort', abortController.abort)
-      signal = abortController.signal
-    }
+    const timeoutSignal = timeout ? AbortSignal.timeout(timeout) : undefined
+    const signal = timeoutSignal ? AbortSignal.any(api.signal, timeoutSignal) : api.signal

     let config: RequestInit = {
       ...baseFetchOptions,
@@ -277,27 +273,17 @@ export function fetchBaseQuery({
     const requestClone = new Request(url, config)
     meta = { request: requestClone }

-    let response,
-      timedOut = false,
-      timeoutId =
-        abortController &&
-        setTimeout(() => {
-          timedOut = true
-          abortController!.abort()
-        }, timeout)
+    let response
     try {
       response = await fetchFn(request)
     } catch (e) {
       return {
         error: {
-          status: timedOut ? 'TIMEOUT_ERROR' : 'FETCH_ERROR',
+          status: timeoutSignal?.aborted ? 'TIMEOUT_ERROR' : 'FETCH_ERROR',
           error: String(e),
         },
         meta,
       }
-    } finally {
-      if (timeoutId) clearTimeout(timeoutId)
-      abortController?.signal.removeEventListener('abort', abortController.abort)
     }
     const responseClone = response.clone()

Ah, yes, that's a thing of beauty!

@EskiMojo14 EskiMojo14 merged commit eb11019 into reduxjs:master Sep 24, 2024
81 checks passed
@EskiMojo14
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thanks!

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Timeout not throwing error with status TIMEOUT_ERROR
3 participants