Lambdas

Este Lab sirve para intruducir al estudiante en el proceso de crear lambdas de forma manual y con el CLI SAM.

Steps to deploy a lambda manually

# Create a role
aws iam create-role --role-name lambda-ex --assume-role-policy-document '{"Version": "2012-10-17","Statement": [{ "Effect": "Allow", "Principal": {"Service": "lambda.amazonaws.com"}, "Action": "sts:AssumeRole"}]}'


# zip your lambda
zip function.zip index.js

# create function
aws lambda create-function --function-name hello-world-function \
--zip-file fileb://function.zip --handler index.handler --runtime nodejs14.x \
--role arn:aws:iam::401202591305:role/lambda-ex

aws lambda invoke --function-name hello-world-function out --log-type Tail

aws lambda invoke --function-name hello-world-function out --log-type Tail \
--query 'LogResult' --output text |  base64 -d

# list lambda functions
aws lambda list-functions --max-items 10


# delete a lambda 
aws lambda delete-function --function-name hello-world-function

AWS cloudformation deploy a lambda

# Zip your code
zip function.zip index.js

# Upload zip to centralized bucket
aws s3api put-object \
  --body helloworld.package.yml \
  --bucket lambdas-zips-us-east-1-wk3v4d \
  --key hello-world/helloworld.package.yml


# Deploy lambda with cloudformation
# This way works but is not the best one.
aws cloudformation deploy --template-file template.yml \
    --stack-name dev-helllo-world \
    --parameter-overrides \
    Env=dev LambdaName=hello-world \
    --tags Env=Dev Course=DevOps \
    --capabilities CAPABILITY_IAM
# Now delete the stack and lets see the sam command

# This is the oficial way to deploy lambdas
sam package \
  --template-file template.yml \
  --output-template-file helloworld.package.yml \
  --s3-bucket lambdas-zips-us-east-1-wk3v4d \
  --s3-prefix hello-world

# Deploy from local package template
sam deploy --template-file helloworld.package.yml \
  --stack-name dev-hello-world \
  --parameter-overrides Env=dev LambdaName=hello-world \
  --capabilities CAPABILITY_IAM

# Deploy from S3 bucket location
sam deploy --stack-name dev-hello-world \
  --s3-bucket lambdas-zips-us-east-1-wk3v4d \
  --s3-prefix hello-world/ \
  --parameter-overrides Env=dev LambdaName=hello-world \
  --capabilities CAPABILITY_IAM


# Test local
sam local invoke helloworld -e message.json

Warning

Recuerda borrar tu stack para evitar algún costo en tu cuenta de AWS

Stack de la lambda creado

Lambda

Test lambda using curl. (You need an API gateway)

curl --request POST \
  --url https://m6tup7s3ja.execute-api.us-east-1.amazonaws.com/live \
  --header 'cache-control: no-cache' \
  --header 'content-type: application/json' \
  --header 'postman-token: 91dba78e-ff34-95dd-fb7e-a7781d96b970' \
  --data '{  "key1": "Hola",  "key2": "desde",  "key3": "postman",  "key4": "Diana Laura"}'