Download Apollo Server

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Apollo Server is a community-maintained open-source GraphQL server. It works with many Node.js HTTP server frameworks, or can run on its own with a built-in Express server. Apollo Server works with any GraphQL schema built with GraphQL.js--or define a schema's type definitions using schema definition language (SDL).

Note: GraphQL is agnostic about the protocol that is used for the communication between client and server and does not require a REST API, but many GraphQL client libraries expect a RESTful API for mutation and query operations. The sample code thus deploys both types of APIs for convenience, but for the remainder of the post, we will focus on the WebSocket API Gateway and omit the REST API for brevity.

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$connect and $disconnect are used by clients to initiate or end a connection with the API Gateway. Each route has a backend integration that is invoked for the respective event. In this example, a Lambda function gets invoked with details of the event. To track each of the connected clients, the handler persists the connection identifiers in a DynamoDB table. Amazon DynamoDB is a fully managed, serverless, key-value NoSQL database designed to run high-performance applications at any scale.

In GraphQL, mutations are used to modify servers-side data. In most implementations, mutations trigger synchronous operations that change data and return a result. Here, mutating data means to submit the message to an Amazon EventBridge event bus for further asynchronous processing. Amazon EventBridge is a serverless event bus that makes it easier to build event-driven applications at scale using events generated from your applications, integrated Software-as-a-Service (SaaS) applications, and AWS services. EventBridge delivers a stream of real-time data from event sources to targets like AWS Lambda. You can set up routing rules to determine where to send your data to build application architectures that react in real time to your data sources with event publisher and consumer completely decoupled.

The ResponseHandler Lambda function subscribes to every response event. When invoked with such an event, it queries DynamoDB to look up the connectionIds that subscribed to this conversation. Finally, it uses the postToConnection() call to trigger a server-side push of the response over the respective WebSocket connections.

In Apollo Server 3, you could import the gql template literal tag directly from the apollo-server library. This template literal tag is provided by the graphql-tag library and allows parsing a GraphQL query string to an AST that can be used by Apollo and other GraphQL libraries.

Indeed, this is a more sophisticated health check than the HTTP-level health check in Apollo Server 3: by executing a GraphQL query, we can ensure that Apollo Server is working in addition to the Node.js process and HTTP server.

Apollo Server options can be set with the graphql.config.apolloServer configuration object. Apollo Server options can be used for instance to enable the tracing feature, which is supported by the GraphQL playground to track the response time of each part of your query. From Apollo Server version 3.9 default cache option is cache: 'bounded'. You can change it in the apolloServer configuration. For more information visit Apollo Server Docs.

The maximum number of items returned by the response is limited to 100 by default. This value can be changed using the defaultLimit configuration option, but should only be changed after careful consideration: a large query can cause a DDoS (Distributed Denial of Service) and may cause abnormal load on your Strapi server, as well as your database server.

A malicious user could send a query with a very high depth, which could overload your server. Use the depthLimit configuration parameter to limit the maximum number of nested fields that can be queried in a single request. By default, depthLimit is set to 10 but can be set to a higher value during testing and development.

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