Amazon DocumentDB Demo Construct

Installing

Pypi (Python)

pip install docdbdemo

npm (JavaScript and TypeScript)

npm install @richardhboyd/doc_db_lib

Usage

Python

from aws_cdk import (
    core
)
from docdbdemo import DocDbLib


class MyStack(core.Stack):

    def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
        super().__init__(scope, id, **kwargs)

        DocDbLib(self, "MyDocDBClient")

TypeScript

import cdk = require('@aws-cdk/core');
import docdbdemo = require('@richardhboyd/doc_db_lib');

export class DocDbClientTsStack extends cdk.Stack {
  constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    new docdbdemo.DocDbLib(this, "MyDocDBClient");
  }
}

Diagram

Interacting

Deploying the stack will create an Amazon DocumentDB Cluster with one instance in each availability zone created by the CDK's VPC Construct, a Lambda function that can put items into the database and fetch them out again, and an API to send requests to the Lambda Funciton.

The stack will output an APIGateway endpoint that will front the created DocumentDB.

Outputs:
DocDbClientTsStack.MyDocDBClientMyDocDbApiMyDocDBApiEndpoint74609B36 = https://gv8ooq7zti.execute-api.us-east-1.amazonaws.com/prod/

Let's look at how we use this new API.

Putting a document in the DocumentDB

API=https://gv8ooq7zti.execute-api.us-east-1.amazonaws.com/prod
curl -H "Content-Type: application/json" -d '{"bestCoder":"@allenmichael", "worstCoder":"singledigit"}' -X POST $API/document

Getting a document out of the database

API=https://gv8ooq7zti.execute-api.us-east-1.amazonaws.com/prod
curl -H "Content-Type: application/json" $API/document?bestCoder=@allenmichael

Testing this out we see

$ curl -H "Content-Type: application/json" -d '{"bestCoder":"@allenmichael", "worstCoder":"@singledigit"}' -X POST $API/document

{"id": "5d7bd032c7866a33171a1261"}

$ curl -H "Content-Type: application/json" $API/document?bestCoder=@allenmichael

{'_id': ObjectId('5d7bcfe6c7866a33171a125f'), 'bestCoder': '@allenmichael', 'worstCoder': '@singledigit'}