Use AWS AppSync

• Use AWS AppSync
  • Schema
  • Delegate part of global GraphQL to haystack GraphQL API

With AWS AppSync, it's possible to merge the Haystack GraphQL API with another GraphQL API.

Schema

The current GraphQL schema for Haystack is here

Delegate part of global GraphQL to haystack GraphQL API

This sample demonstrates how it's possible to delegate a part of GraphQL request to Haystack GraphQL API with AWS AppSync.

In the AWS AppSync console:

• First, deploy your AWS Lambda function with Haystack GraphQL API
• In AppSync, build from scratch a new GraphQL API with the name SHaystack
• Create a datasource HaystackLambda with an AWS Lambda function
  • Select "Lambda Function"
  • Select the AWS Lambda for Haystack
  • Select the region
  • and a role

• Create a function
  • Choose the data source SHaystackLambda
  • Function name SHaystackWrapper
  • Description Delegate part of Graphql request to Haystack GraphQL API
  • import the body of request-filter.json inside the Configure the request mapping template
  • import the body of response-filter.json inside the Configure the response mapping template
  • ask the API URL (zappa status --json | jq -r '."API Gateway URL"').
  • You must receive something like https://jihndyzv6h.execute-api.us-east-2.amazonaws.com/dev. Extract only the host name.
  • Inside the request filter:
    • The prefix must be set in the variable $apiId (`#set($apiId = "jihndyzv6h"))
    • Update the variable $region (#set($region = "us-east-2"))

• Import the schema
  • Copy the body of schema.graphql in the schema of AppSync
  • Save the schema
  • At the end of the Resolver list, attach a resolver for the filed haystack

• select the datasource HaystackLambda
• Convert to pipeline resolver and add the function SHaystackWrapper
• Create and save the resolver

• Test a query
  • like { haystack { tagValues(tag:"dis") } }

Now, you can extend the AppSync schema and attach others API in the endpoint.