add timeout option to fetchBaseQuery

docs/rtk-query/api/fetchBaseQuery.mdx

@@ -13,7 +13,7 @@ description: 'RTK Query > API: fetchBaseQuery reference'
 
 This is a very small wrapper around [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API) that aims to simplify requests. It is not a full-blown replacement for `axios`, `superagent`, or any other more heavy-weight library, but it will cover the large majority of your needs.
 
-It takes all standard options from fetch's [`RequestInit`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch) interface, as well as `baseUrl`, a `prepareHeaders` function, an optional `fetch` function, and a `paramsSerializer` function.
+It takes all standard options from fetch's [`RequestInit`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch) interface, as well as `baseUrl`, a `prepareHeaders` function, an optional `fetch` function, a `paramsSerializer` function, and a `timeout`.
 
 - `baseUrl` _(required)_
   - Typically a string like `https://api.your-really-great-app.com/v1/`. If you don't provide a `baseUrl`, it defaults to a relative path from where the request is being made. You should most likely _always_ specify this.
@@ -38,6 +38,8 @@ It takes all standard options from fetch's [`RequestInit`](https://developer.moz
   - A function that can be used to apply custom transformations to the data passed into [`params`](#setting-the-query-string). If you don't provide this, `params` will be given directly to `new URLSearchParms()`. With some API integrations, you may need to leverage this to use something like the [`query-string`](https://github.com/sindresorhus/query-string) library to support different array types.
 - `fetchFn` _(optional)_
   - A fetch function that overrides the default on the window. Can be useful in SSR environments where you may need to leverage `isomorphic-fetch` or `cross-fetch`.
+- `timeout` _(optional)_
+  - A number in milliseconds that represents the maximum time a request can take before timing out.
 
 ```ts title="Return types of fetchBaseQuery" no-transpile
 Promise<{
@@ -114,6 +116,7 @@ There is more behavior that you can define on a per-request basis that extends t
 - [`body`](#setting-the-body)
 - [`responseHandler`](#parsing-a-Response)
 - [`validateStatus`](#handling-non-standard-response-status-codes)
+- [`timeout`](#adding-a-custom-timeout-to-requests)
 
 ```ts title="endpoint request options"
 interface FetchArgs extends RequestInit {
@@ -122,6 +125,7 @@ interface FetchArgs extends RequestInit {
   body?: any
   responseHandler?: 'json' | 'text' | ((response: Response) => Promise<any>)
   validateStatus?: (response: Response, body: any) => boolean
+  timeout?: number
 }
 
 const defaultValidateStatus = (response: Response) =>
@@ -227,3 +231,23 @@ export const customApi = createApi({
   }),
 })
 ```
+
+### Adding a custom timeout to requests
+
+By default, `fetchBaseQuery` has no default timeout value set, meaning your requests will stay pending until your api resolves the request(s) or it reaches the browser's default timeout (normally 5 minutes). Most of the time, this isn't what you'll want. When using `fetchBaseQuery`, you have the ability to set a `timeout` on the `baseQuery` or on individual endpoints. When specifying both options, the endpoint value will take priority.
+
+```ts title="Setting a timeout value"
+import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query'
+
+export const api = createApi({
+  baseQuery: fetchBaseQuery({ baseUrl: '/api/', timeout: 10000 }), // Set a default timeout of 10 seconds
+  endpoints: (builder) => ({
+    getUsers: builder.query({
+      query: () => ({
+        url: `users`,
+        timeout: 1000, // We know the users endpoint is _really fast_ because it's always cached. We can assume if its over > 1000ms, something is wrong and we should abort the request.
+      }),
+    }),
+  }),
+})
+```

packages/toolkit/src/createAsyncThunk.ts

@@ -24,6 +24,7 @@ export type BaseThunkAPI<
   extra: E
   requestId: string
   signal: AbortSignal
+  abort: (reason?: string) => void
   rejectWithValue: IsUnknown<
     RejectedMeta,
     (value: RejectedValue) => RejectWithValue<RejectedValue, RejectedMeta>,
@@ -610,6 +611,7 @@ If you want to use the AbortController to react to \`abort\` events, please cons
                 extra,
                 requestId,
                 signal: abortController.signal,
+                abort,
                 rejectWithValue: ((
                   value: RejectedValue,
                   meta?: RejectedMeta

packages/toolkit/src/query/baseQueryTypes.ts

@@ -3,6 +3,7 @@ import type { MaybePromise, UnwrapPromise } from './tsHelpers'
 
 export interface BaseQueryApi {
   signal: AbortSignal
+  abort: (reason?: string) => void
   dispatch: ThunkDispatch<any, any, any>
   getState: () => unknown
   extra: unknown

packages/toolkit/src/query/core/buildThunks.ts

@@ -261,7 +261,15 @@ export function buildThunks<
     ThunkApiMetaConfig & { state: RootState<any, string, ReducerPath> }
   > = async (
     arg,
-    { signal, rejectWithValue, fulfillWithValue, dispatch, getState, extra }
+    {
+      signal,
+      abort,
+      rejectWithValue,
+      fulfillWithValue,
+      dispatch,
+      getState,
+      extra,
+    }
   ) => {
     const endpointDefinition = endpointDefinitions[arg.endpointName]
 
@@ -274,6 +282,7 @@ export function buildThunks<
       let result: QueryReturnValue
       const baseQueryApi = {
         signal,
+        abort,
         dispatch,
         getState,
         extra,

packages/toolkit/src/query/fetchBaseQuery.ts

@@ -25,6 +25,7 @@ export interface FetchArgs extends CustomRequestInit {
   body?: any
   responseHandler?: ResponseHandler
   validateStatus?: (response: Response, body: any) => boolean
+  timeout?: number
 }
 
 /**
@@ -38,7 +39,7 @@ const defaultValidateStatus = (response: Response) =>
   response.status >= 200 && response.status <= 299
 
 const defaultIsJsonContentType = (headers: Headers) =>
-  /*applicat*//ion\/(vnd\.api\+)?json/.test(headers.get('content-type') || '')
+  /*applicat*/ /ion\/(vnd\.api\+)?json/.test(headers.get('content-type') || '')
 
 const handleResponse = async (
   response: Response,
@@ -88,6 +89,15 @@ export type FetchBaseQueryError =
       data: string
       error: string
     }
+  | {
+      /**
+       * * `"TIMEOUT_ERROR"`:
+       *   Request timed out
+       **/
+      status: 'TIMEOUT_ERROR'
+      data?: undefined
+      error: string
+    }
   | {
       /**
        * * `"CUSTOM_ERROR"`:
@@ -136,6 +146,10 @@ export type FetchBaseQueryArgs = {
    * Defaults to `application/json`;
    */
   jsonContentType?: string
+  /**
+   * A number in milliseconds that represents that maximum time a request can take before timing out.
+   */
+  timeout?: number
 } & RequestInit
 
 export type FetchBaseQueryMeta = { request: Request; response?: Response }
@@ -180,6 +194,9 @@ export type FetchBaseQueryMeta = { request: Request; response?: Response }
  * An optional predicate function to determine if `JSON.stringify()` should be called on the `body` arg of `FetchArgs`
  *
  * @param {string} jsonContentType Defaults to `application/json`. Used when automatically setting the content-type header for a request with a jsonifiable body that does not have an explicit content-type header.
+ *
+ * @param {number} timeout
+ * A number in milliseconds that represents the maximum time a request can take before timing out.
  */
 export function fetchBaseQuery({
   baseUrl,
@@ -188,6 +205,7 @@ export function fetchBaseQuery({
   paramsSerializer,
   isJsonContentType = defaultIsJsonContentType,
   jsonContentType = 'application/json',
+  timeout: defaultTimeout,
   ...baseFetchOptions
 }: FetchBaseQueryArgs = {}): BaseQueryFn<
   string | FetchArgs,
@@ -212,6 +230,7 @@ export function fetchBaseQuery({
       params = undefined,
       responseHandler = 'json' as const,
       validateStatus = defaultValidateStatus,
+      timeout = defaultTimeout,
       ...rest
     } = typeof arg == 'string' ? { url: arg } : arg
     let config: RequestInit = {
@@ -256,11 +275,26 @@ export function fetchBaseQuery({
     const requestClone = request.clone()
     meta = { request: requestClone }
 
-    let response
+    let response,
+      timedOut = false,
+      timeoutId =
+        timeout &&
+        setTimeout(() => {
+          timedOut = true
+          api.abort()
+        }, timeout)
     try {
       response = await fetchFn(request)
     } catch (e) {
-      return { error: { status: 'FETCH_ERROR', error: String(e) }, meta }
+      return {
+        error: {
+          status: timedOut ? 'TIMEOUT_ERROR' : 'FETCH_ERROR',
+          error: String(e),
+        },
+        meta,
+      }
+    } finally {
+      if (timeoutId) clearTimeout(timeoutId)
     }
     const responseClone = response.clone()
 

packages/toolkit/src/query/tests/createApi.test.ts

@@ -310,6 +310,7 @@ describe('endpoint definition typings', () => {
     const commonBaseQueryApi = {
       dispatch: expect.any(Function),
       endpoint: expect.any(String),
+      abort: expect.any(Function),
       extra: undefined,
       forced: expect.any(Boolean),
       getState: expect.any(Function),
@@ -353,6 +354,7 @@ describe('endpoint definition typings', () => {
             endpoint: expect.any(String),
             getState: expect.any(Function),
             signal: expect.any(Object),
+            abort: expect.any(Function),
             forced: expect.any(Boolean),
             type: expect.any(String),
           },
@@ -365,6 +367,7 @@ describe('endpoint definition typings', () => {
             endpoint: expect.any(String),
             getState: expect.any(Function),
             signal: expect.any(Object),
+            abort: expect.any(Function),
             forced: expect.any(Boolean),
             type: expect.any(String),
           },
@@ -377,6 +380,7 @@ describe('endpoint definition typings', () => {
             endpoint: expect.any(String),
             getState: expect.any(Function),
             signal: expect.any(Object),
+            abort: expect.any(Function),
             // forced: undefined,
             type: expect.any(String),
           },
@@ -389,6 +393,7 @@ describe('endpoint definition typings', () => {
             endpoint: expect.any(String),
             getState: expect.any(Function),
             signal: expect.any(Object),
+            abort: expect.any(Function),
             // forced: undefined,
             type: expect.any(String),
           },

packages/toolkit/src/query/tests/errorHandling.test.tsx

@@ -34,8 +34,12 @@ const failQueryOnce = rest.get('/query', (_, req, ctx) =>
 describe('fetchBaseQuery', () => {
   let commonBaseQueryApiArgs: BaseQueryApi = {} as any
   beforeEach(() => {
+    const abortController = new AbortController()
     commonBaseQueryApiArgs = {
-      signal: new AbortController().signal,
+      signal: abortController.signal,
+      abort: (reason) =>
+        //@ts-ignore
+        abortController.abort(reason),
       dispatch: storeRef.store.dispatch,
       getState: storeRef.store.getState,
       extra: undefined,

packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx

@@ -1,6 +1,6 @@
 import { createSlice } from '@reduxjs/toolkit'
 import { createApi, fetchBaseQuery } from '@reduxjs/toolkit/query'
-import { setupApiStore } from './helpers'
+import { setupApiStore, waitMs } from './helpers'
 import { server } from './mocks/server'
 // @ts-ignore
 import nodeFetch from 'node-fetch'
@@ -76,8 +76,12 @@ type RootState = ReturnType<typeof storeRef.store.getState>
 
 let commonBaseQueryApi: BaseQueryApi = {} as any
 beforeEach(() => {
+  let abortController = new AbortController()
   commonBaseQueryApi = {
-    signal: new AbortController().signal,
+    signal: abortController.signal,
+    abort: (reason) =>
+      // @ts-ignore
+      abortController.abort(reason),
     dispatch: storeRef.store.dispatch,
     getState: storeRef.store.getState,
     extra: undefined,
@@ -564,11 +568,15 @@ describe('fetchBaseQuery', () => {
     test('prepareHeaders is able to select from a state', async () => {
       let request: any
 
-      const doRequest = async () =>
-        baseQuery(
+      const doRequest = async () => {
+        const abortController = new AbortController()
+        return baseQuery(
           { url: '/echo' },
           {
-            signal: new AbortController().signal,
+            signal: abortController.signal,
+            abort: (reason) =>
+              // @ts-ignore
+              abortController.abort(reason),
             dispatch: storeRef.store.dispatch,
             getState: storeRef.store.getState,
             extra: undefined,
@@ -577,6 +585,7 @@ describe('fetchBaseQuery', () => {
           },
           {}
         )
+      }
 
       ;({ data: request } = await doRequest())
 
@@ -614,11 +623,15 @@ describe('fetchBaseQuery', () => {
         getTokenSilently: async () => 'fakeToken',
       }
 
-      const doRequest = async () =>
-        baseQuery(
+      const doRequest = async () => {
+        const abortController = new AbortController()
+        return baseQuery(
           { url: '/echo' },
           {
-            signal: new AbortController().signal,
+            signal: abortController.signal,
+            abort: (reason) =>
+              // @ts-ignore
+              abortController.abort(reason),
             dispatch: storeRef.store.dispatch,
             getState: storeRef.store.getState,
             extra: fakeAuth0Client,
@@ -628,6 +641,7 @@ describe('fetchBaseQuery', () => {
           },
           {}
         )
+      }
 
       await doRequest()
 
@@ -761,3 +775,30 @@ describe('still throws on completely unexpected errors', () => {
     await expect(req).rejects.toBe(error)
   })
 })
+
+describe('timeout', () => {
+  it('throws a timeout error when a request takes longer than specified timeout duration', async () => {
+    jest.useFakeTimers('legacy')
+    let result: any
+    server.use(
+      rest.get('https://example.com/empty', (req, res, ctx) =>
+        res.once(
+          ctx.delay(3000),
+          ctx.json({ ...req, headers: req.headers.all() })
+        )
+      )
+    )
+    Promise.resolve(
+      baseQuery({ url: '/empty', timeout: 2000 }, commonBaseQueryApi, {})
+    ).then((r) => {
+      result = r
+    })
+    await waitMs()
+    jest.runAllTimers()
+    await waitMs()
+    expect(result?.error).toEqual({
+      status: 'TIMEOUT_ERROR',
+      error: 'AbortError: The user aborted a request.',
+    })
+  })
+})