VISITOR COUNTER

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SUMMARY

This application uses Pulumi to manage AWS cloud infrastructure.

AWS SERVICES:

• Backend:
  • DynamoDB
  • APIGateway
  • Lambda
• Frontend:
  • HTML
  • CSS

PULUMI LIBRARIES:

• @pulumi/aws
• @pulumi/awsx

DYNAMODB

• Data Storage for the visitor count

id	count
count	19

let countTable = new aws.dynamodb.Table("countTable", {
  attributes: [{ name: "id", type: "S" }],
  hashKey: "id",
  readCapacity: 5,
  writeCapacity: 5,
});

API GATEWAY

• REST api - handles request/response

let endpoint = new awsx.apigateway.API("endpoint", {
  routes: [{
    path: "",
    method: "GET",
    ...

LAMBDA

• Event driven
  • Allows me to run code when needed

eventHandler: async (event) => {
      // CREATE client for DynamoDB
      let client = new aws.sdk.DynamoDB.DocumentClient();

      // GET current count data
      let countData = await client.get({
        TableName: countTable.name.get(),
        Key: { id: "count" },
        ConsistentRead: true,
      }).promise();
      ...