generative-ai-cdk-constructs

aws-summarization-appsync-stepfn

Stability: Experimental

All classes are under active development and subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

Language Package
Typescript Logo TypeScript @cdklabs/generative-ai-cdk-constructs
Python Logo Python cdklabs.generative_ai_cdk_constructs

Table of contents

Overview

This construct presents a scalable and decoupled workflow to generate summaries for multiple PDF documents or images using Amazon Bedrock as the foundation. It leverages the state-of-the-art natural language processing capabilities of Anthropic’s Claude V2.1/Claude-3 model, integrated with AWS services such as AppSync, Step Functions, Lambda, and EventBridge.

The workflow is initiated by submitting a GraphQL request to AWS AppSync, containing the list of files that require summarization. AppSync acts as the entry point, forwarding the request to an Amazon EventBridge event bus through a custom data source resolver. EventBridge decouples the architecture, enabling asynchronous processing and facilitating the distribution of the request to AWS Step Functions for orchestration.

Step Functions implements a stateful workflow that validates the input request, processes and transforms the files in parallel, and generates summaries for each file. The workflow leverages AWS Lambda functions for specific tasks, such as file validation, transformation, and summarization using the Anthropic Claude model.

The pattern is designed to be configurable, allowing users to customize various aspects of the workflow through the construct’s properties. These configurations may include settings for file types, summarization parameters, and other user-specific requirements.

By combining the power of Anthropic’s cutting-edge language model with the scalability and flexibility of AWS services, this pattern enables efficient and automated summarization of large volumes of documents or images, streamlining information processing and extraction tasks.

This construct builds a Lambda function from a Docker image, thus you need Docker desktop running on your machine.

The input document(s) must be stored in the input Amazon Simple Storage Service (S3) bucket in text format (.txt). Another construct is available to ingest and process files to text format: aws-rag-appsync-stepfn-opensearch.

Make sure the model (anthropic.claude-v2:1) is enabled in your account. Please follow the Amazon Bedrock User Guide for steps related to enabling model access.

AWS Lambda functions provisioned in this construct use Powertools for AWS Lambda (Python) for tracing, structured logging and custom metrics creation.

Here is a minimal deployable pattern definition:

Create a CDK TypeScript project and then update the stack with below configuration.

TypeScript

import { Construct } from 'constructs';
import { Stack, StackProps } from 'aws-cdk-lib';
import * as cognito from 'aws-cdk-lib/aws-cognito';
import { SummarizationAppsyncStepfn, SummarizationAppsyncStepfnProps } from '@cdklabs/generative-ai-cdk-constructs';

// get an existing userpool 
const cognitoPoolId = 'us-east-1_XXXXX';
const userPoolLoaded = cognito.UserPool.fromUserPoolId(this, 'myuserpool', cognitoPoolId);

summarizationTestConstruct = new SummarizationAppsyncStepfn(
    this, 
    'SummarizationAppsyncStepfn', 
    {
        cognitoUserPool: userPoolLoaded
    });

Python

from constructs import Construct
from aws_cdk import aws_cognito as cognito
from cdklabs.generative_ai_cdk_constructs import SummarizationAppsyncStepfn

# get an existing userpool 
cognito_pool_id = 'us-east-1_XXXXX';
user_pool_loaded = cognito.UserPool.from_user_pool_id(
    self,
    'myuserpool',
    user_pool_id=cognito_pool_id,
)

summarization_test_construct = SummarizationAppsyncStepfn(
    self, 
    'SummarizationAppsyncStepfn', 
    cognito_user_pool=user_pool_loaded,
)

If file transformation is required set isFileTransformationRequired to ‘True’

 isFileTransformationRequired: 'True'

For existing resources like Amazon VPC and Amazon S3 buckets, use props like existingVpc, existingInputAssetsBucketObj, and existingProcessedAssetsBucketObj.

After deploying the CDK stack, the document summarization workflow can be invoked using GraphQL APIs. The API schema details are present here: resources/gen-ai/aws-summarization-appsync-stepfn/schema.graphql.

The code below provides an example of a subscription call and associated mutation to trigger the summarization workflow and get response notifications. The subscription call wait for the mutation request to send the notifications.

Subscription call to receive notifications:

subscription MySubscription {
  updateSummaryJobStatus(summary_job_id: "81") {
      name
      status
      summary
      summary_job_id
  }
}
_______________________________________

Expected response:

{
  "data": {
    "updateSummaryJobStatus": {
          "name": "document1.txt",
          "status": "Completed",
          "summary": "<base 64 encoded summary>"
          "summary_job_id": "81"
    }
  }
}

Where:

Mutation call to trigger the summarization:

mutation MyMutation {
  generateSummary(summaryInput:
    {name: "document1.pdf", status: "", summary: "",
      ignore_existing: false, summary_job_id: "81"}) {
      name
      status
      summary
      summary_job_id
  }
}
_______________________________________

Expected response: It invoke an asynchronous summarization process thus the response notification are send on subscription channel.

{
  "data": {
    "generateSummary": {
      "name": null,
      "summary_job_id": null
    }
  }
}

Where:

If multiple files are requested for summarization , then the client should filter response based on summary_job_id and name for each file.

Initializer

new SummarizationAppsyncStepfn(scope: Construct, id: string, props: SummarizationAppsyncStepfnProps)

Parameters

Pattern Construct Props

Name Type Required Description
cognitoUserPool cognito.IUserPool Required Amazon Cognito user pool used for authentication.
vpcProps ec2.VpcProps Optional The construct creates a custom VPC based on vpcProps. Providing both this and existingVpc will result in an error.
existingVpc ec2.IVpc Optional An existing VPC can be used to deploy the construct.
existingSecurityGroup ec2.ISecurityGroup Optional Security group for the Lambda function which this construct will use. If no exisiting security group is provided it will create one from the VPC.
existingInputAssetsBucketObj s3.IBucket Optional Existing S3 bucket to store the input document to be summarized. PDF is the supported input document format. If transformed (.txt format) file is available, then this bucket is optional.
bucketInputsAssetsProps s3.BucketProps Optional User-provided props to override the default props for the S3 bucket. Providing both this and existingInputAssetsBucketObj will result in an error.
isFileTransformationRequired string Optional The summary construct transforms the input document into .txt format. If the transformation is not required then this flag can be set to false. If set to true, then a transformed asset bucket is created which transforms the input document from input asset bucket to .txt format.
existingProcessedAssetsBucketObj s3.IBucket Optional This bucket stores the transformed (.txt) assets for generating the summary. If none is provided then this contruct will create one.
bucketProcessedAssetsProps s3.BucketProps Optional User-provided props to override the default props for the S3 bucket. Providing both this and existingProcessedAssetsBucket will result in an error.
existingBusInterface events.IEventBus Optional Existing instance of event bus. The summary construct integrates AppSync with EventBridge to route the request to Step Functions.
eventBusProps events.EventBusProps Optional A new custom event bus is created with provided props. Providing both existingBusInterface and eventBusProps will result in an error.
existingMergedApi appsync.CfnGraphQLApi Optional Existing Merged API instance. The Merged API provides a federated schema over source API schemas.
summaryApiName string Optional User-provided name for summary API on AppSync. A GraphQL API will be created with this name.
observability boolean Optional Enables observability on all services used. Warning: associated costs with the services used. It is a best practice to enable by default. Defaults to true.
summaryChainType string Optional Chain type defines how to pass the document to the LLM. There are three chain types. Stuff: Simply “stuff” all your documents into a single prompt. Map-reduce: Summarize each document on its own in a “map” step and then “reduce” the summaries into a final summary. Refine: Loops over the input documents and iteratively updates its answer.
stage string Optional Value will be appended to resources name service.
customDocumentReaderDockerLambdaProps DockerLambdaCustomProps Optional Allows to provide document reading custom lambda code and settings instead of the default construct implementation.
customInputValidationDockerLambdaProps DockerLambdaCustomProps Optional Allows to provide input validation custom lambda code and settings instead of the default construct implementation.
customSummaryGeneratorDockerLambdaProps DockerLambdaCustomProps Optional Allows to provide summary generation custom lambda code and settings instead of the default construct implementation.

Pattern Properties

Name Type Description
eventBridgeBus events.IEventBus An instance of events.IEventBus created by the construct
mergeApi appsync.CfnGraphQLApi Instance of appsync.CfnGraphQLApi for Merged API created by the construct
graphqlApi appsync.IGraphqlApi Instance of appsync.CfnGraphQLApi for summary created by the construct
vpc ec2.IVpc Returns the instance of ec2.ISecurityGroup used by the construct
securityGroup ec2.ISecurityGroup Returns the instance of ec2.ISecurityGroup used by the construct.
inputAssetBucket s3.Bucket Instance of s3.IBucket used by the construct
processedAssetBucket s3.Bucket Instance of s3.IBucket used by the construct
summaryGeneratorLambdaFunction lambda.DockerImageFunction Returns an instance of lambda.DockerImageFunction used for the summary generation job created by the construct
documentReaderLambdaFunction lambda.DockerImageFunction Returns an instance of lambda.DockerImageFunction used for the document reading job created by the construct
inputValidationLambdaFunction lambda.DockerImageFunction Returns an instance of lambda.DockerImageFunction used for the input validation job created by the construct

Default properties

Out-of-the-box implementation of the construct without any override will set the following defaults:

VPC

AppSync

Amazon S3 Buckets

Observability

By default the construct will enable logging and tracing on all services which support those features. Observability can be turned off through the pattern properties.

Troubleshooting

Error Code Message Description Fix
601 Invalid file format. Only .txt and .pdf file format are supported Provide a valid file with .pdf or .txt extension
602 Not able to transform the file. File transformation from .pdf to .txt failed Check if valid file exist in input bucket
603 No file available to read. Couldn’t read file from input bucket Check if valid file exist in input bucket
604 Something went wrong while generating summary! LLM threw an exception Check if your account has access to Amazon Bedrock

Architecture

Architecture Diagram

Cost

You are responsible for the cost of the AWS services used while running this construct. As of this revision, the cost for running this construct with the default settings in the US East (N. Virginia) Region is approximately $292.04 per month.

We recommend creating a budget through AWS Cost Explorer to help manage costs. Prices are subject to change. For full details, refer to the pricing webpage for each AWS service used in this solution.

The following table provides a sample cost breakdown for deploying this solution with the default parameters in the US East (N. Virginia) Region for one month.

AWS Service Dimensions Cost [USD]
AWS Step Functions 15 requests per hour for summarization, each with 2 files (4 steps per workflow) 0.99
Amazon Virtual Private Cloud   0.00
AWS AppSync 15 requests per hour to trigger summarization + (15 x 4 calls to notify clients through subscriptions) = 54,000 requests per month 0.22
Amazon EventBridge 15 requests per hour = 10800 custom events per month 0.01
AWS Lambda 15 summarization requests per hour with 2 files each time, through 4 Lambda functions each allocated with 7076 MB of memory allocated and 512 MB of ephemeral storage allocated and an average run time of 30 seconds = 43200 requests per month 142.59
Amazon Simple Storage Service 15 requests per hour for summarization with 2 files in input format (PDF) with an average size of 1MB and transformed files to text format with an average size of 1 MB = 43.2 GB per month in S3 Standard Storage 0.99
Amazon Bedrock With the on-demand mode, for text generation models, you are charged for every input token processed and every output token generated. Anthropic.claude model price for 1000 input tokens= $0.01102 and for 1000 output tokens = $0.03268. With a pdf of 50 pages (asumming each page having 200 words) , 50 * 200 , there are 10000 words, which are ~= 7500 tokens. Input token cost for 200 request per month = 7.5 * 0.01102 * 200 = 16.53. Asumming a summary of 200 words (150 tokens) for 200 requests per month cost of output token = 150 * (0.03268/1000) * 200 = 9.804. Total cost for 200 summary requests , 16.53 + 9.804 = $26.334 26.34
Amazon CloudWatch 15 metrics using 5 GB data ingested for logs 7.02
AWS X-Ray 100,000 requests per month through AppSync and Lambda calls 0.50
Total Deployment cost   178.16

The resources not created by this construct (Amazon Cognito User Pool, AppSync Merged API, AWS Secrets Manager secret) do not appear in the table above. You can refer to the decicated pages to get an estimate of the cost related to those services:

Security

When you build systems on AWS infrastructure, security responsibilities are shared between you and AWS. This shared responsibility model reduces your operational burden because AWS operates, manages, and controls the components including the host operating system, virtualization layer, and physical security of the facilities in which the services operate. For more information about AWS security, visit AWS Cloud Security.

This construct requires you to provide an existing Amazon Cognito User Pool. Please refer to the official documentation on best practices to secure this service:

Optionnaly, you can provide existing resources to the constructs (marked optional in the construct pattern props). If you chose to do so, please refer to the official documentation on best practices to secure each service:

If you grant access to a user to your account where this construct is deployed, this user may access information stored by the construct (Amazon Simple Storage Service buckets, Amazon Elasticache, Amazon CloudWatch logs). To help secure your AWS resources, please follow the best practices for AWS Identity and Access Management (IAM).

Note This construct requires you to provide documents in the input assets bucket. You should validate each file in the bucket before using this construct. See here for file input validation best practices. Ensure you only ingest the appropriate documents into your knowledge base. Any results returned by the knowledge base is eligible for inclusion into the prompt; and therefore, being sent to the LLM. If using a third-party LLM, ensure you audit the documents contained within your knowledge base. This construct provides several configurable options for logging. Please consider security best practices when enabling or disabling logging and related features. Verbose logging, for instance, may log content of API calls. You can disable this functionality by ensuring observability flag is set to false.

Supported AWS Regions

This solution optionally uses the Amazon Bedrock service, which is not currently available in all AWS Regions. You must launch this construct in an AWS Region where these services are available. For the most current availability of AWS services by Region, see the AWS Regional Services List.

Note You need to explicity enable access to models before they are available for use in the Amazon Bedrock service. Please follow the Amazon Bedrock User Guide for steps related to enabling model access.

Quotas

Service quotas, also referred to as limits, are the maximum number of service resources or operations for your AWS account.

Make sure you have sufficient quota for each of the services implemented in this solution. For more information, refer to AWS service quotas.

To view the service quotas for all AWS services in the documentation without switching pages, view the information in the Service endpoints and quotas page in the PDF instead.

Clean up

When deleting your stack which uses this construct, do not forget to go over the following instructions to avoid unexpected charges:

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