I've decided to dive into golang. I usually learn best when I try to build something so I've decided to re-write a Telegram bot I created a few years ago called the WhosInBot. It gets used by quite a few groups here in Singapore ano who know where else. I've had a few issues with the server it's running on recently so the idea of converting it to an AWS Lambda function (which recently released support for golang!) was appealing.
I've had some experience using the serverless framework in the past and found it pretty nice so I thought I'd start there.
Links:
Dependencies:
- Node 6+
brew install node - Golang 1.10+
brew install go - AWS CLI
brew install awscli - Git
Step 1: Create the initial project
npm install -g serverless
cd ${GOPATH}/src
serverless create -t aws-go-dep -p whoinbot
cd whoinbot
git init
git add .
git commit -m "initial commit"
The serverless golang template requires the dep package manager so we also need to install that.
brew install dep
make
Ok great it build correctly but I'd like to make a few changes before doing the first deploy.
Firstly I need to configure my AWS credentials. In my case I just needed to update serverless.yml to specify the correct profile. I also specified the ap-southeast-1 region (a.k.a Singapore).
provider:
name: aws
runtime: go1.x
region: ap-southeast-1
profile: col.w.harris
Next I deleted the world directory as I only need a single function and renamed the other function to telegram.
Then I updated the Makefile.
build:
dep ensure
GOOS=linux go build -o bin/telegram telegram/main.go
Next I updated the function config within the serverless.yml to reference new the telegram function and add a http event source. This will cause serverless to configure a web endpoint to access the lambda function.
functions:
telegram:
handler: bin/telegram
events:
- http:
path: telegram
method: post
cors: true
then finally the first deployment
sls deploy