angelmunoz/mandabot

F# and AWS Lambda. A simple and effective way to go into serverless territory with the language you love

F# + AWS Lambda

Disclaimer

I'm no serverless/lambda expert, I'm just a guy that found really easy to get started with AWS lambda using .NET specially F#

This is a simple F# lambda function that is used together with API Gateway and serves as the webhook for a Telegram Bot

I added the API Gateway manually inside the AWS Console, Lambdas can also be invoked for a number of events inside AWS services, API Gateway, like S3, DynamoDB, etc, etc

Requirements

To create templates, deploy and work with .Net lambdas easily you need the following stuff

• AWS CLI - configure credentials for deployment via IAM (aws configure)
• AWS Lambda .NET Templates - dotnet CLI templates for Lambda (includes F# and Giraffe Serverless)
• AWS .NET Tool Extensions - Deployment tools for AWS Lambda
• VSCode AWS Extension - Easily access Logs and AWS Resources

you can also find the full suite of tools in the aws dotnet repository

Tests are simple to execute simply do

dotnet test tests/Mandabot.Tests

Even though I've been basically debuging live hiting the endpoint and sending messages to the bot and letting telegram handle the update event

Also please be advised this bot+lambda is not connected to a database, the main purpose was to actually figure out the lambda development and deployment

Deploying

Deploying is super simple, just update the aws-lambda-tools-defaults.json with your data (profile and region) then simply type

cd src/Mandabot
dotnet lambda deploy-function NAME_OF_YOUR_FUNCTION

the CLI will try to figure out if there's something missing with your configuration and prompt you if necessary if everything is fine it will deploy your Lambda Function in a few seconds and that's it your Lambda is live to start testing with it

Invoking

Invoking your function is really easy as well

cd src/Mandabot
dotnet lambda invoke-function NAME_OF_YOUR_FUNCTION --payload "{ \"my-json\": \"object\" }"