- what does the API project application represent
- what are the necessary cloud infrastructure resources on which the API project application relies on
The API project application represents your project’s GraphQL API, which is utilized by the Admin and Website applications.
But do note that the API application is more than just a simple GraphQL interface. The default Webiny applications not only define and extend the application’s GraphQL schema, but also introduce additional processes and cloud infrastructure resources in order to achieve their goal. For example, in order to serve files and optimize images, the File Manager application brings a couple of dedicated AWS Lambda functions.
Of course, the application can additionally grow in terms of application code and cloud infrastructure on your behalf, if need be.
For brevity, the diagram doesn’t include network-level cloud infrastructure resources, like region, VPC, availability zones, and so on. Check out the Deployment Modes section if you’re interested in that aspect of the deployed cloud infrastructure.
Note that the stateful resources like Amazon S3, Amazon Cognito, Amazon DynamoDB and Amazon ElasticSearch are deployed as part of the Core project application. These are still included in the diagram, just so it’s more clear to the reader.
The diagram gives an overview of the complete cloud infrastructure that is deployed by different Webiny applications, which together form the API project application.
- File Manager
- Page Builder (with Prerendering Service)
- Form Builder
- Headless CMS
In the following text, we briefly cover how each of the different Webiny applications are utilizing the shown cloud infrastructure.
Besides extending the GraphQL schema, the Page Builder application also introduces a couple of AWS Lambda functions that are responsible for importing and exporting of pages.
Also, via an Amazon EventBridge (part of the Core project application, now shown on the diagram), it interacts with the prerendering service that’s deployed as part of the Website project application (more on this in the Website section.For storing data and performing search queries, the application relies on Amazon DynamoDB
There are a couple of reason for that.
First, implementing a GraphQL Handler using AWS Lambda enables us and our users to make additional customizations to server’s behavior.
The default Webiny applications rely on this fact as well. For example, the I18N application gives you the ability to check what is the current locale that the user is on. The Security application gives you the ability to perform custom authentication and authorization checks inside of your resolvers. Finally, it also makes it possible for the Headless CMS application to generate different GraphQL schemas, based on the current I18N locale.
Finally, this approach makes it much easier for Webiny to be hosted on not just one cloud infrastructure provider (AWS), but on many more, like Microsoft Azure or Google Cloud Platform.
By default, we deploy HTTP APIs. This can be changed on your behalf, if need be.
Webiny is following the approach called single-table design, which advocates for storing all the application data in a single DynamoDB table. So all of the Webiny applications are storing data in a single table, with distinct primary and secondary keys in order to avoid clashing of data.
Currently it is deployed into a single AZ, just for cost reasons. But yes, production workloads should use two or three AZs. Check out the Amazon ElasticSearch Service’s FAQ page for more information.Deploying the Amazon ElasticSearch Service