url-shortner-lambda-go

Description

url-shortner-lambda-go is a service to shorten URL using AWS Lambda and DynamoDB

Production

prerequisites

You have to prepare credentials with proper policies.

And,

• install aws-cli
• install aws-sam-cli. Docker is also required. Follow the instruction here.
• install direnv
• install saw
  • you can watch CloudWatch logs on your terminal
• set environment variables to .envrc.sample and remove .sample.
  • LINK_TABLE is DynamoDB table name where maps of your original URLs and shortend resource are gonna be saved.
  • REGION is where your project is gonna be deployed.
  • STACK_BUCKET is S3 bucket name for artifacts of SAM and should be unique globally.

deploy

$ dep ensure                       # to resolve dependency
$ aws s3 mb "s3://${STACK_BUCKET}" # for artifacts of SAM
$ make deploy
# Your endpoint is gonna be pirinted.

# You can change url for your own.
$ curl -X POST https://yyyyyyyyyy.execute-api.[your region].amazonaws.com/Prod/links -d '{"url":"http://toshi0607.com/"}'
xxxxxxxxx

then you can access https://yyyyyyyyyy.execute-api.[your region].amazonaws.com/Prod/links/xxxxxxxxx and it'll be redirected to the original URL.

log

Deploy is required before checking behavior.

$ saw groups
/aws/lambda/url-shortener-lambda-go-Redirect-XXXXXXXXXXXX
/aws/lambda/url-shortener-lambda-go-Shorten-XXXXXXXXXXXX

$ saw watch /aws/lambda/url-shortener-lambda-go-Redirect-XXXXXXXXXXXX &
$ saw watch /aws/lambda/url-shortener-lambda-go-Shorten-XXXXXXXXXXXX &

# open another window
$ curl -X POST https://yyyyyyyyyy.execute-api.[your region].amazonaws.com/Prod/links -d '{"url":"http://toshi0607.com/"}'

Local

You can test AWS Lambda & API Gateway locally with AWS SAM (Serverless Application Model).

hosting

$ sam local start-api # you have to use DynamoDB 

# You can change url for your own.
$ curl -X POST http://127.0.0.1:3000/links -d '{"url":"http://toshi0607.com/"'}
xxx

then you can access http://127.0.0.1:3000/links/xxxxxxxxx and it'll be redirected to the original URL.

testing

DynamoDB local is useful as well.

You can try to use the DynamoDB local in test as below.

$ docker pull amazon/dynamodb-local
$ docker run -p 8000:8000 amazon/dynamodb-local
$ make test

Articles (Japanese)

• Goで学ぶAWS Lambda（PDF、ePubセット版）
  • This architecture is explained in detail in this book.
• 技術書典5で『Goで学ぶAWS Lambda』を出展します #技術書典
• 技術書典5の『Goで学ぶAWS Lambda』の振り返りとフィードバックのお願い #技術書典