Handle http 429 errors

src/lib/requests/client/BaseClient.ts

@@ -12,6 +12,8 @@ import { AuthManager } from '@/features/authentication/AuthManager.ts';
 import type { AbortableApolloMutationResponse } from '@/lib/requests/RequestManager.ts';
 import { SubpathUtil } from '@/lib/utils/SubpathUtil.ts';
 import { ControlledPromise } from '@/lib/ControlledPromise.ts';
+import { d } from 'koration';
+import dayjs from 'dayjs';
 
 interface QueuedRequest {
     execute: () => void;
@@ -19,7 +21,14 @@ interface QueuedRequest {
     reject: (error: any) => void;
 }
 
+interface RateLimitInfo {
+    timestamp: number;
+    retryAfter: number;
+}
+
 export abstract class BaseClient<Client, ClientConfig, Fetcher> {
+    private static readonly RATE_LIMIT_STORAGE_KEY = 'RATE_LIMIT_STATE';
+
     static readonly BASE_URL_KEY = 'serverBaseURL';
 
     protected abstract client: Client;
@@ -32,6 +41,16 @@ export abstract class BaseClient<Client, ClientConfig, Fetcher> {
 
     protected requestQueue: QueuedRequest[] = [];
 
+    private static rateLimitState = new Map<string, RateLimitInfo>();
+
+    protected constructor(
+        protected handleRefreshToken: (refreshToken: string) => AbortableApolloMutationResponse<UserRefreshMutation>,
+    ) {
+        const rateLimitState = AppStorage.local.getItemParsed(BaseClient.RATE_LIMIT_STORAGE_KEY, {});
+
+        BaseClient.rateLimitState = new Map(Object.entries(rateLimitState));
+    }
+
     public reset(): void {
         BaseClient.activeTokenRefreshPromise = null;
         this.clearQueue(new Error('Client reset'));
@@ -86,11 +105,7 @@ export abstract class BaseClient<Client, ClientConfig, Fetcher> {
         }
     }
 
-    protected constructor(
+    private static getBaseUrl(): string {
-        protected handleRefreshToken: (refreshToken: string) => AbortableApolloMutationResponse<UserRefreshMutation>,
-    ) {}
-
-    public getBaseUrl(): string {
         const { hostname, port, protocol } = window.location;
 
         const defaultUrl = import.meta.env.DEV
@@ -103,6 +118,10 @@ export abstract class BaseClient<Client, ClientConfig, Fetcher> {
         return SubpathUtil.getApiBaseUrl(serverBaseURL);
     }
 
+    public getBaseUrl(): string {
+        return BaseClient.getBaseUrl();
+    }
+
     // oxlint-disable-next-line no-unused-vars
     protected shouldQueueRequest(operationName?: string): boolean {
         return AuthManager.shouldQueueRequests();
@@ -147,4 +166,82 @@ export abstract class BaseClient<Client, ClientConfig, Fetcher> {
     }
 
     public abstract updateConfig(config: Partial<ClientConfig>): void;
+
+    private static saveRateLimits() {
+        AppStorage.local.setItem(
+            BaseClient.RATE_LIMIT_STORAGE_KEY,
+            Object.fromEntries([...BaseClient.rateLimitState.entries()]),
+        );
+    }
+
+    private convertRetryAfter(retryAfter: string | null | undefined): number {
+        if (retryAfter == null) {
+            return d(1).minutes.inWholeMilliseconds;
+        }
+
+        const seconds = parseInt(retryAfter, 10);
+        if (!Number.isNaN(seconds)) {
+            return d(seconds).seconds.inWholeMilliseconds;
+        }
+
+        const date = new Date(retryAfter);
+
+        return dayjs(date).diff();
+    }
+
+    protected getOriginFromUrl(url: string): string {
+        const { origin } = new URL(url);
+
+        if (origin.startsWith(BaseClient.getBaseUrl())) {
+            return url;
+        }
+
+        return origin;
+    }
+
+    protected addRateLimit(url: string, retryAfter: string | null | undefined) {
+        BaseClient.rateLimitState.set(this.getOriginFromUrl(url), {
+            timestamp: Date.now(),
+            retryAfter: this.convertRetryAfter(retryAfter),
+        });
+        BaseClient.saveRateLimits();
+    }
+
+    private deleteRateLimit(origin: string) {
+        BaseClient.rateLimitState.delete(origin);
+        BaseClient.saveRateLimits();
+    }
+
+    protected getRateLimitTimeout(url: string): number {
+        return BaseClient.rateLimitState.get(this.getOriginFromUrl(url))?.retryAfter ?? 0;
+    }
+
+    protected isRateLimited(url: string): boolean {
+        const origin = this.getOriginFromUrl(url);
+
+        const rateLimitInfo = BaseClient.rateLimitState.get(origin);
+
+        if (!rateLimitInfo) {
+            return false;
+        }
+
+        const shouldRetry = Date.now() >= rateLimitInfo.timestamp + rateLimitInfo.retryAfter;
+        if (!shouldRetry) {
+            return true;
+        }
+
+        this.deleteRateLimit(origin);
+
+        return false;
+    }
+
+    protected async awaitRateLimit(url: string): Promise<void> {
+        if (!this.isRateLimited(url)) {
+            return;
+        }
+
+        await new Promise((resolve) => {
+            setTimeout(resolve, this.getRateLimitTimeout(url));
+        });
+    }
 }

src/lib/requests/client/GraphQLClient.ts

@@ -8,7 +8,8 @@
 
 import { ErrorLink } from '@apollo/client/link/error';
 import { SetContextLink } from '@apollo/client/link/context';
-import { ApolloClient, ApolloLink, CombinedGraphQLErrors, InMemoryCache } from '@apollo/client';
+import type { ErrorLike } from '@apollo/client';
+import { ApolloClient, ApolloLink, CombinedGraphQLErrors, InMemoryCache, ServerError } from '@apollo/client';
 import { from, filter, map, switchMap, firstValueFrom } from 'rxjs';
 import UploadHttpLink from 'apollo-upload-client/UploadHttpLink.mjs';
 import { GraphQLWsLink } from '@apollo/client/link/subscriptions';
@@ -248,6 +249,31 @@ export class GraphQLClient extends BaseClient<ApolloClient, ApolloClient.Options
         });
     }
 
+    protected override getOriginFromUrl(operation: string): string {
+        return operation;
+    }
+
+    private getRateLimitOrigin(operation: ApolloLink.Operation): string {
+        return `${operation.operationName}::${JSON.stringify(operation.variables)}`;
+    }
+
+    private isRateLimitError(error: ErrorLike): boolean {
+        if (CombinedGraphQLErrors.is(error)) {
+            return error.errors.some(
+                (gqlError) =>
+                    gqlError.message.toLowerCase().includes('http 429') ||
+                    gqlError.message.toLowerCase().includes('http error 429') ||
+                    gqlError.message.toLowerCase().includes('too many requests'),
+            );
+        }
+
+        if (ServerError.is(error)) {
+            return error.statusCode === 429;
+        }
+
+        return false;
+    }
+
     private isAuthError(errors: readonly GraphQLFormattedError[]): boolean {
         return errors.some((graphQLError) =>
             graphQLError.message.includes('suwayomi.tachidesk.server.user.UnauthorizedException'),
@@ -256,9 +282,21 @@ export class GraphQLClient extends BaseClient<ApolloClient, ApolloClient.Options
 
     private createErrorLink() {
         return new ErrorLink(({ error, operation, forward }) => {
+            if (this.isRateLimitError(error)) {
+                this.addRateLimit(
+                    this.getRateLimitOrigin(operation),
+                    operation.getContext()?.headers?.get?.('Retry-After'),
+                );
+
+                return from(this.awaitRateLimit(this.getRateLimitOrigin(operation))).pipe(
+                    switchMap(() => forward(operation)),
+                );
+            }
+
             if (!CombinedGraphQLErrors.is(error)) {
                 return undefined;
             }
+
             if (!this.isAuthError(error.errors)) {
                 return undefined;
             }

src/lib/requests/client/RestClient.ts

@@ -55,6 +55,8 @@ export class RestClient
             const isAuthRequired = AuthManager.isAuthRequired();
             const accessToken = AuthManager.getAccessToken();
 
+            await this.awaitRateLimit(updatedUrl);
+
             let result: Response;
 
             switch (httpMethod) {
@@ -90,6 +92,11 @@ export class RestClient
                 return this.fetcher(url, { data, httpMethod, config, checkResponseIsJson });
             }
 
+            if (result.status === 429) {
+                this.addRateLimit(updatedUrl, result.headers.get('Retry-After'));
+                return this.fetcher(url, { data, httpMethod, config, checkResponseIsJson });
+            }
+
             if (result.status !== 200) {
                 throw new Error(`status ${result.status}: ${result.statusText}`);
             }