Function - Amazon Serverless Application Model
SyntaxProperties
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China (PDF).

Function

Configure functions in GraphQL APIs to perform certain operations.

Syntax

To declare this entity in your Amazon Serverless Application Model (Amazon SAM) template, use the following syntax.

YAML

LogicalId:
  CodeUri: String
  DataSource: String
  Description: String
  Id: String
  InlineCode: String
  MaxBatchSize: Integer
  Name: String
  Runtime: Runtime
  Sync: SyncConfig

Properties

CodeUri

The function code’s Amazon Simple Storage Service (Amazon S3) URI or path to local folder.

If you specify a path to a local folder, Amazon CloudFormation requires that the file is first uploaded to Amazon S3 before deployment. You can use the Amazon SAM CLI to facilitate this process. For more information, see How Amazon SAM uploads local files at deployment.

Type: String

Required: No

Amazon CloudFormation compatibility: This property is passed directly to the CodeS3Location property of an AWS::AppSync::FunctionConfiguration resource.

DataSource

The name of the data source that this function will attach to.

  • To reference a data source within the AWS::Serverless::GraphQLApi resource, specify its logical ID.

  • To reference a data source outside of the AWS::Serverless::GraphQLApi resource, provide its Name attribute using the Fn::GetAtt intrinsic function. For example, !GetAtt MyLambdaDataSource.Name.

  • To reference a data source from a different stack, use Fn::ImportValue.

If a variation of [NONE | None | none] is specified, Amazon SAM will generate a None value for the AWS::AppSync::DataSource Type object.

Type: String

Required: Yes

Amazon CloudFormation compatibility: This property is passed directly to the DataSourceName property of an AWS::AppSync::FunctionConfiguration resource.

Description

The description of your function.

Type: String

Required: No

Amazon CloudFormation compatibility: This property is passed directly to the Description property of an AWS::AppSync::FunctionConfiguration resource.

Id

The Function ID for a function located outside of the AWS::Serverless::GraphQLApi resource.

  • To reference a function within the same Amazon SAM template, use the Fn::GetAtt intrinsic function. For example Id: !GetAtt createPostItemFunc.FunctionId.

  • To reference a function from a different stack, use Fn::ImportValue.

When using Id, all other properties are not allowed. Amazon SAM will automatically pass the Function ID of your referenced function.

Type: String

Required: No

Amazon CloudFormation compatibility: This property is unique to Amazon SAM and doesn’t have an Amazon CloudFormation equivalent.

InlineCode

The function code that contains the request and response functions.

Type: String

Required: No

Amazon CloudFormation compatibility: This property is passed directly to the Code property of an AWS::AppSync::FunctionConfiguration resource.

LogicalId

The unique name of your function.

Type: String

Required: Yes

Amazon CloudFormation compatibility: This property is passed directly to the Name property of an AWS::AppSync::FunctionConfiguration resource.

MaxBatchSize

The maximum number of resolver request inputs that will be sent to a single Amazon Lambda function in a BatchInvoke operation.

Type: Integer

Required: No

Amazon CloudFormation compatibility: This property is passed directly to the MaxBatchSize property of an AWS::AppSync::FunctionConfiguration resource.

Name

The name of the function. Specify to override the LogicalId value.

Type: String

Required: No

Amazon CloudFormation compatibility: This property is passed directly to the Name property of an AWS::AppSync::FunctionConfiguration resource.

Runtime

Describes a runtime used by an Amazon AppSync pipeline resolver or Amazon AppSync function. Specifies the name and version of the runtime to use.

Type: Runtime

Required: Yes

Amazon CloudFormation compatibility: This property is unique to Amazon SAM and doesn't have an Amazon CloudFormation equivalent. It is similar to the Runtime property of an AWS::AppSync::FunctionConfiguration resource.

Sync

Describes a Sync configuration for a function.

Specifies which Conflict Detection strategy and Resolution strategy to use when the function is invoked.

Type: SyncConfig

Required: No

Amazon CloudFormation compatibility: This property is passed directly to the SyncConfig property of an AWS::AppSync::FunctionConfiguration resource.