Example of a CDK cached resolver in AppSync api

serverless-blog-stack.ts

// appsync lambda data source
    const blogNoDaxDataSource: appsync.LambdaDataSource =
      new appsync.LambdaDataSource(this, "GetBlogNoDaxLambdaDataSource", {
        api,
        lambdaFunction: getBlogNoDaxHandler,
        description: "Get Blog (no dax) Lambda Data Source",
        name: "GetBlogNoDaxLambdaDataSource",
      });

// appsync resolver
const getBlogNoDaxResolver: appsync.CfnResolver = new appsync.CfnResolver(
      this,
      "getBlogNoDaxResolver",
      {
        apiId: api.apiId,
        typeName: "Query",
        fieldName: "getBlogNoDax",
        cachingConfig: {
          ttl: cdk.Duration.seconds(30).toSeconds(),
          cachingKeys: ["$context.arguments.id"], // Valid values are entries from the $context.arguments, $context.source, and $context.identity maps
        },
        kind: "UNIT",
        dataSourceName: blogNoDaxDataSource.name,
      }
    );

// add caching for the api
    new appsync.CfnApiCache(this, "appsync-cache", {
      apiCachingBehavior: "PER_RESOLVER_CACHING",
      apiId: api.apiId,
      ttl: cdk.Duration.seconds(30).toSeconds(), // cache for 30 seconds as default
      type: "SMALL",
      atRestEncryptionEnabled: true,
      transitEncryptionEnabled: true,
    });