AWS Lambda and MongoDB

You have to use Pymongo, you can download it using pip install pymongo -t <your_location> after that zip it with your code and any dependancy then upload it to the Lambda console

import pymongo
name = "db_username"
password = "db_password"
db_name = "db_name"
db_host  = "db_host"
mongo_link = "mongodb://"+name+":"+password+"@"+db_host+"/"+db_name
def handler(event, context):
    client = pymongo.MongoClient(mongo_link)
    # Get the sampleDB database
    db = client.sampleDB

MongoClient can be used to connect to MongoDatabase from Lambda.

MongoClientURI mongoClientURI = new MongoClientURI(mongoURl);
MongoClient mongoClient = new MongoClient(mongoClientURI);
MongoDatabase db = mongoClient.getDatabase(mongoDB);

first you need to connect via SSH, then it will set a connection between to your AWS lambda and Mongodb instance

if your mongodb hosts in EC2 instances, then you can pass this way

let dbDetails ={
    username:'', //Ubuntu or ec2-user
    dstHost:'localhost',
    host:'',  //IP Address of your instance
    dstPort:27017,
    privateKey:fs.readFileSync(''), //your pem file
    port:22
}

So, after this you need to use SSH client like ssh tunnel

   let server = tunnel(config, function (error, server) {
                   //handle error
        }

  {
                   //success message
}

Connect with SSH. 'ssh tunnel' npm modules is there. install it and pass the correct value to it like IP address, port, username, DB port with PEM file(Must). it will connect.

1. make a virutalenv something like "venv" and run pip3 install pymongo in your local system
2. then make a new folder that has all the packages of the venv installed (copy from venv --> lib --> python 3.x --> site packages)
3. copy your lambda python file also into the same folder you have the pacakges
4. then zip the folder and you see a upload zip file in aws lambda function, upload it and save
5. note that, your lambda function py file is named as "lambda_file" and lambda function inside it is named as "lamda_function" then change the name in handler info in aws lambda placed in third column
6. like this lambda_file.lambda_function

You can build a layer for PyMongo and reference it within your Lambda function. Please refer to https://www.kodyaz.com/aws/create-lambda-layer-for-pymongo-to-connect-amazon-documentdb-using-python.aspx for creating Lambda function Layer with Python and PyMongo and you can find a sample Lambda function utilizing this Layer for connecting to Amazon DocumentDB at https://www.kodyaz.com/aws/connect-amazon-documentdb-using-python-from-aws-lambda-function.aspx

Hope these two helps,