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Creating Product Microservices Serverless CRUD REST API Infrastructure with AWS CDK (Api Gateway - Lambda - DynamoDB)

Pragya Keshap answered on February 13, 2023 Popularity 3/10 Helpfulness 3/10

answer Creating Product Microservices Serverless CRUD REST API Infrastructure with AWS CDK (Api Gateway - Lambda - DynamoDB)

Creating Product Microservices Serverless CRUD REST API Infrastructure with AWS CDK (Api Gateway - Lambda - DynamoDB)

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Step 1: Create a DynamoDB table

Step 2: Create a Lambda function

Step 3: Create an HTTP API

Step 4: Create routes

Step 5: Create an integration

Step 6: Attach your integration to routes

Step 7: Test your API

Step 8: Clean up

Next steps: Automate with AWS SAM or AWS CloudFormation

import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
import {
  DynamoDBDocumentClient,
  ScanCommand,
  PutCommand,
  GetCommand,
  DeleteCommand,
} from "@aws-sdk/lib-dynamodb";

const client = new DynamoDBClient({});

const dynamo = DynamoDBDocumentClient.from(client);

const tableName = "http-crud-tutorial-items";

export const handler = async (event, context) => {
  let body;
  let statusCode = 200;
  const headers = {
    "Content-Type": "application/json",
  };

  try {
    switch (event.routeKey) {
      case "DELETE /items/{id}":
        await dynamo.send(
          new DeleteCommand({
            TableName: tableName,
            Key: {
              id: event.pathParameters.id,
            },
          })
        );
        body = `Deleted item ${event.pathParameters.id}`;
        break;
      case "GET /items/{id}":
        body = await dynamo.send(
          new GetCommand({
            TableName: tableName,
            Key: {
              id: event.pathParameters.id,
            },
          })
        );
        body = body.Item;
        break;
      case "GET /items":
        body = await dynamo.send(
          new ScanCommand({ TableName: tableName })
        );
        body = body.Items;
        break;
      case "PUT /items":
        let requestJSON = JSON.parse(event.body);
        await dynamo.send(
          new PutCommand({
            TableName: tableName,
            Item: {
              id: requestJSON.id,
              price: requestJSON.price,
              name: requestJSON.name,
            },
          })
        );
        body = `Put item ${requestJSON.id}`;
        break;
      default:
        throw new Error(`Unsupported route: "${event.routeKey}"`);
    }
  } catch (err) {
    statusCode = 400;
    body = err.message;
  } finally {
    body = JSON.stringify(body);
  }

  return {
    statusCode,
    body,
    headers,
  };
};

https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-dynamo-db.html

Popularity 3/10 Helpfulness 3/10 Language typescript

Source: Grepper

Tags: api aws-cdk crud infrastructure lambda microservices product rest serverless typescript

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Contributed on Feb 13 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Creating Product Microservices Serverless CRUD REST API Infrastructure with AWS CDK (Api Gateway - Lambda - DynamoDB)

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