fix(api): add rate limiter to TMDb requests to hopefully deal with 429s (#2881)

fixes #2853

server/api/externalapi.ts

@@ -1,4 +1,5 @@
 import axios, { AxiosInstance, AxiosRequestConfig } from 'axios';
+import rateLimit from 'axios-rate-limit';
 import NodeCache from 'node-cache';
 
 // 5 minute default TTL (in seconds)
@@ -10,6 +11,10 @@ const DEFAULT_ROLLING_BUFFER = 10000;
 interface ExternalAPIOptions {
   nodeCache?: NodeCache;
   headers?: Record<string, unknown>;
+  rateLimit?: {
+    maxRPS: number;
+    maxRequests: number;
+  };
 }
 
 class ExternalAPI {
@@ -31,6 +36,14 @@ class ExternalAPI {
         ...options.headers,
       },
     });
+
+    if (options.rateLimit) {
+      this.axios = rateLimit(this.axios, {
+        maxRequests: options.rateLimit.maxRequests,
+        maxRPS: options.rateLimit.maxRPS,
+      });
+    }
+
     this.baseUrl = baseUrl;
     this.cache = options.nodeCache;
   }

server/api/themoviedb/index.ts

@@ -92,6 +92,10 @@ class TheMovieDb extends ExternalAPI {
       },
       {
         nodeCache: cacheManager.getCache('tmdb').data,
+        rateLimit: {
+          maxRequests: 20,
+          maxRPS: 1,
+        },
       }
     );
     this.region = region;