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45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
# AppSync
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AppSync is a fully managed [[GraphQL|GraphQL]] service.
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Notes:
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- It can support real-time [[API]]s via GraphQL subscriptions.
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- AppSync supports custom domains
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- AppSync has a query editor built into the UI
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## Resolvers
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Resolvers attached to specific fields within your types in your schema. used to implement the state-changing operations for your query, mutation, and subscription field operations.
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Runtimes:
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- **`APPSYNC_JS`**: JavaScript
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- **VTL**: Velocity Template Language.
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## Data Sources
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Where data is being pulled from.
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- DynamoDB Table
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- Amazon OpenSearch
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- AWS [[_Lambda|Lambda Function]]
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- [[HTTP]] Endpoint
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- Amazon EventBridge
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- Relational Database (RDS HTTP Endpoint)
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## API Types
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- **GraphQL APIs** - single API from multiple data sources
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- **Merged APIs** - a collection of Graph APIs that act as one API
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- Useful if you have multiple teams that manage their own API but you want to treat all the APIs as a single API.
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## Caching Options
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- **None**: Self explanatory; no caching, resolvers will always fetch from data sources.
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- **Full request caching**: Self explanatory; caches all requests.
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- **Per-resolver caching**: specific operation or field defined in a resolver will return responses from the cache.
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Caching isn't serverless; you must provision an on-demand instance.
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# Authorisation
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- API Key
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- AWS IAM
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- Cognito User Pools
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