A serverless GraphQL and Pub/Sub API service that streamlines the development of modern web and mobile applications
AppSync GraphQL APIs – provides a unified endpoint for securely querying and updating data from multiple databases, microservices, and APIs
AppSync Pub/Sub APIs – data updates are automatically published to subscribed API clients via serverless WebSockets connections.
It allows apps to retrieve data from servers.
The GraphQL proxy is a component that runs the GraphQL engine to process requests and map them to logical functions for data operations or triggers.
Three level operations:
Query – read-only fetch
Mutation – write followed by a fetch
Subscription – long-lived connection for receiving data
The operations are exposed via a schema that defines the capabilities of an API.
A schema is made up of types, which can be root or user-defined.
To build a GraphQL API, you need to have the following:
GraphQL Schema – each GraphQL API is defined by a single GraphQL schema.
Data Source – AWS resources that GraphQL APIs can interact with.
Resolvers – uses mapping templates to convert a GraphQL expression into a format that the data source can use.
Unit resolver – performs a single operation against a predefined data source.
Pipeline resolver – executes multiple operations against multiple data sources.
You can use a GraphQL client or HTTP to connect to a GraphQL API.
By specifying a GraphQL schema directive on a mutation, you can make any data source in AWS AppSync real time.
Basic – subscription query filtering based on client-defined arguments.
Enhanced – filtering based on logic defined centrally in the backend of the AWS AppSync.
You can also use specific filtering logic to forcefully unsubscribe and close a WebSocket connection from a connected client.
Configuration and settings
You can cache frequently requested data to reduce the load on your resolvers.
By compressing API responses, you can download content faster and save money on data transfer fees.
Supports custom domain names for your API.
Use Amazon CloudWatch Logs to monitor your AWS AppSync GraphQL API and debug request issues.
You can use AWS X-Ray to trace GraphQL requests in AWS AppSync.
With AWS CloudTrail, you can log AWS AppSync API calls.
In your API or CLI call, you can specify which authorization type you want:
Using schema directives, you can specify additional authorization modes at the schema level.
You can use AWS WAF to configure a set of rules to protect your web applications and APIs from attacks
You are charged for the following:
Query and data modification operations.
Performing real-time updates on your data.
Minutes of connection to AppSync.
Dedicated cache instance.