Add an optional param to provide assignmentCache solution; fallback t…

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@eppo/node-server-sdk",
-  "version": "3.0.2",
+  "version": "3.0.3",
   "description": "Eppo node server SDK",
   "main": "dist/index.js",
   "files": [

src/index.ts

@@ -6,12 +6,13 @@ import {
   FlagConfigurationRequestParameters,
   MemoryOnlyConfigurationStore,
   Flag,
+  AssignmentCache,
 } from '@eppo/js-client-sdk-common';
+import { Cacheable } from '@eppo/js-client-sdk-common/dist/assignment-cache';
 import { ObfuscatedFlag } from '@eppo/js-client-sdk-common/dist/interfaces';
 
 import { sdkName, sdkVersion } from './sdk-data';
 
-
 /**
  * Configuration used for initializing the Eppo client
  * @public
@@ -33,6 +34,11 @@ export interface IClientConfig {
    */
   assignmentLogger: IAssignmentLogger;
 
+  /**
+   * (optional) Provide your own caching solution. If not defined, LRU cache will be used.
+   */
+  assignmentCache?: AssignmentCache<Cacheable>;
+
   /***
    * Timeout in milliseconds for the HTTPS request for the experiment configuration. (Default: 5000)
    */
@@ -61,6 +67,8 @@ export interface IClientConfig {
    * Poll for new configurations even if the initial configuration request failed. (default: false)
    */
   pollAfterFailedInitialization?: boolean;
+
+  disablePolling?: boolean;
 }
 
 export { IAssignmentEvent, IAssignmentLogger } from '@eppo/js-client-sdk-common';
@@ -94,13 +102,20 @@ export async function init(config: IClientConfig): Promise<IEppoClient> {
   clientInstance = new EppoClient(configurationStore, requestConfiguration);
   clientInstance.setLogger(config.assignmentLogger);
 
-  // default to LRU cache with 50_000 entries.
-  // we estimate this will use no more than 10 MB of memory
-  // and should be appropriate for most server-side use cases.
-  clientInstance.useLRUInMemoryAssignmentCache(50_000);
+  if (config.assignmentCache) {
+    clientInstance.useCustomAssignmentCache(config.assignmentCache);
+  } else {
+    // default to LRU cache with 50_000 entries.
+    // we estimate this will use no more than 10 MB of memory
+    // and should be appropriate for most server-side use cases.
+
+    clientInstance.useLRUInMemoryAssignmentCache(50_000);
+  }
 
-  // Fetch configurations (which will also start regular polling per requestConfiguration)
-  await clientInstance.fetchFlagConfigurations();
+  if (!config.disablePolling) {
+    // Fetch configurations (which will also start regular polling per requestConfiguration)
+    await clientInstance.fetchFlagConfigurations();
+  }
 
   return clientInstance;
 }