Using AWS Lambda with .NET Core | Coding Live #001

Getting Started

These instructions is a part of a live coding video.

Prerequisites

• .NET Core 3.1 SDK - https://dotnet.microsoft.com/download
• Install the AWS CLI - https://aws.amazon.com/pt/cli/
• Install AWS templates for .NET CLI
• Install AWS Lambda Tools for .NET CLI
• Configure your AWS Access Key via AWS CLI

AWS

• AWS account and security credential (AWS Access Key ID / AWS Secret Access Key)
• AWS security credential with role AWSLambdaFullAccess
• AWS security credential with role IAMFullAccess (optional)

Install AWS templates for .NET CLI

dotnet new -i Amazon.Lambda.Templates

Install AWS Lambda Tools for .NET CLI

dotnet tool install -g Amazon.Lambda.Tools
or
dotnet tool update -g Amazon.Lambda.Tools

Configure your AWS Access Key via AWS CLI

aws configure
AWS Access Key ID: <your access key id>
AWS Secret Access Key: <your secret access key>

File aws-lambda-tools-defaults.json

{
  "profile": "",
  // Default region in the deployment, if empty, will need to inform during deployment
  "region": "us-east-2", 
  "configuration": "Release",
  "framework": "netcoreapp3.1",
  "function-name": "LambdaForProject1",
  "function-runtime": "dotnetcore3.1",
  "function-memory-size": 256,
  "function-timeout": 30,
  // SolutionName::Namespace.ClassName::HandlerMethod
  "function-handler": "Project1::Project1.Function::FunctionHandler"
}

Projects

Create a base folder LambdaProjects.

Create the .gitignore file based on file https://github.com/github/gitignore/blob/master/VisualStudio.gitignore

Project 1

dotnet new lambda.EmptyFunction --name Project1

Running the tests

cd Project1\test\Project1.Tests
dotnet test

Deploy function

cd Project1\src\Project1
dotnet lambda deploy-function

Enter AWS Region: (The region to connect to AWS services, if not set region will be detected from the environment.)
us-east-2

Enter Function Name: (AWS Lambda function name)
LambdaForProject1

Enter name of the new IAM Role:
or
Select IAM Role that to provide AWS credentials to your code:
1) *** Create new IAM Role ***

Enter name of the new IAM Role:
role-for-my-lambda-functions

Select IAM Policy to attach to the new role and grant permissions
    1) AWSLambdaFullAccess (Provides full access to Lambda, S3, DynamoDB, CloudWatch Metrics and  ...)

Invoking function via .NET CLI

cd Project1\src\Project1
dotnet lambda invoke-function LambdaForProject1 --payload "Angelito Casagrande"

Alternative manual deploy

If you haven´t directly access to AWS, you can send a .zip with the publish package.

Packing the project

cd Project1\src\Project1
dotnet lambda package

Output file: Project1\src\Project1\bin\Release\netcoreapp3.1\Project1.zip

Project 2

dotnet new lambda.S3 --name Project2
cd Project2\src\Project2

# Adding ImageMagick package
dotnet add package Magick.NET-Q8-AnyCPU

Logging

context.Logger.LogLine("I am here");

References

https://docs.aws.amazon.com/lambda/latest/dg/lambda-csharp.html

https://imagemagick.org/

https://github.com/dlemstra/Magick.NET