Support direct resolvers in aws_appsync_resolver resource

[npellegrin]

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Description

AWS now supports direct lambda resolvers in AppSync.

Developers can now send directly the request and build the response in a Lambda function, without the need to write VTL ( Apache Velocity Template Language) templates.

New or Affected Resource(s)

• aws_appsync_resolver

Potential Terraform Configuration

The fields request_template and response_template are now optional.
Sugested code:

resource "aws_appsync_resolver" "test" {
  api_id      = aws_appsync_graphql_api.test.id
  field       = "singlePost"
  type        = "Query"
  data_source = aws_appsync_datasource.lambda.name
}

References

AWS blog post:

• https://aws.amazon.com/fr/blogs/mobile/appsync-direct-lambda/

Change in botocore (change available from 1.17.36):

• boto/botocore@06210b5#diff-03a20e0acefe68dfa350f5c3d516a439L1216

Change in aws-sdk-go (change available from 1.33.20):

• aws/aws-sdk-go@2007a98#diff-3788cc6943b7c1e2dcb5dcc3b9a853caL936

[ewbankkit]

Announcement.

Requires AWS SDK v1.33.20:

• Update module aws/aws-sdk-go to v1.33.21 #14000

[antonbabenko]

It turns out that direct lambda resolvers are using VTL templates under the hood, too.

This code is a workaround unless request_template and response_template are optional (#14710):

resource "aws_appsync_resolver" "lambda" {
  api_id      = aws_appsync_graphql_api.this.id
  field       = "getLayer"
  type        = "Query"
  data_source = aws_appsync_datasource.lambda.name

  request_template = <<-EOF
  {
    "version" : "2017-02-28",
    "operation": "Invoke",
    "payload": {
      "arguments": $util.toJson($ctx.arguments),
      "identity": $util.toJson($ctx.identity),
      "source": $util.toJson($ctx.source),
      "request": $util.toJson($ctx.request),
      "prev": $util.toJson($ctx.prev),
      "info": {
          "selectionSetList": $util.toJson($ctx.info.selectionSetList),
          "selectionSetGraphQL": $util.toJson($ctx.info.selectionSetGraphQL),
          "parentTypeName": $util.toJson($ctx.info.parentTypeName),
          "fieldName": $util.toJson($ctx.info.fieldName),
          "variables": $util.toJson($ctx.info.variables)
      },
      "stash": $util.toJson($ctx.stash)
    }
  }
  EOF

  response_template = <<-EOF
  $util.toJson($ctx.result)
  EOF
}

[github-actions]

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