Avoid using Docker with Serverless Offline and Golang

Question

Currently, every time I need to use serverless offline, I have to set my function handler in serverless.yml to the main.go of the function as such:

hello:
    handler: src/hello/main.go
    memorySize: 128
    timeout: 5
    events:
        - httpApi:
              path: /hello
              method: get
    iamRoleStatements:
        - Effect: 'Allow'
          Action:
              - 'dynamodb:GetItem'
          Resource: !GetAtt DeviceTable.Arn

But keeping this breaks AWS Lambda and I have to change it back to bin/hello.

A solution is to use serverless offline --useDocker but testing functions that is running in Docker takes more than 30s, which is super slow.

Is there a way around this?

hoangdv · Accepted Answer · 2022-10-03 09:51:39Z

1

Just compile your go code to binary files then run the serverless offline command.

You can create a Makefile to create some alias command. ex

.PHONY: build clean deploy deploy-local

build: clean
    @env GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/hello src/hello/main.go

clean:
    @rm -rf ./bin

deploy-local: build
    @sls offline

deploy: clean build
    @sls deploy --verbose

Then, you can run make deploy-local to start serverless offline server

answered Oct 3, 2022 at 9:51

hoangdv

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