The image service written by golang. Use to handle the images from cloud storage. Display the different size image based on the request parameters.

1. Download image from url;
2. Crop the image;
3. Compress the image size;
4. Upload to the cloud service;

1. Docker
2. Serverless

• Copy and set environment values

cp .env.dist .env

• Build image in your local

docker compose build

• Install required NodeJS libraries

docker compose run --rm app bash -c "npm --prefix /go/src/image-functions/.node install"

• If you want to install some NodeJS packages

docker compose run --rm app bash -c "npm --prefix /go/src/image-functions/.node install serverless --save-dev"

• Install required Golang libraries

docker compose run --rm app make install

• Run the binary file build and watch

docker compose up -d

• Build the production file

docker compose run --rm app make build

• Run the unit test

docker compose run --rm app make test

• Run the benchmark

docker compose run --rm app make benchmark

• Start the serverless offline, there no runner for runtime go1.x in the serverless offline, so use the docker to run it

.node/node_modules/.bin/serverless offline start --useDocker --stage=dev

• Run or Debug it by IDE We can use the GoLand to build and run the main.go It will start a http server by using the port 8080

• Use Goland old version (<2020.1.4) to load new Go SDK (1.17+)? Error: unpacked SDK is corrupted

vim <GO_SDK_PATH>/src/runtime/internal/sys/zversion.go
# ADD the const TheVersion
const TheVersion = `go1.17.*`

• Create and use local S3 bucket

aws --endpoint-url http://localhost:4566 s3api create-bucket --bucket test

# List buckets
aws --endpoint-url http://localhost:4566 s3api list-buckets

# Copy one file into S3
aws --endpoint-url http://localhost:4566 s3 cp README.md s3://test/

# List the copied file
aws --endpoint-url http://localhost:4566 s3 ls s3://test/

• Load this pre-request script in the postman, or import this collection

const jwtHeader = btoa(JSON.stringify(
    {
        alg: 'HS256',
        typ: 'JWT'
    }
)).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '');

const jwtBody = btoa(JSON.stringify(
    {
        app: 'image-functions',
        data: {
            host: 'lmg.jj20.com'
        },
        exp: Math.floor(Date.now() / 1000) + 7200
    }
)).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '');

const hmac = CryptoJS.HmacSHA256(jwtHeader + '.' + jwtBody, pm.environment.get('AUTH_KEY'));
const hmacBase64 = CryptoJS.enc.Base64.stringify(hmac).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '');

pm.request.headers.add({
    key: 'Authorization',
    value: 'Bearer ' + jwtHeader + '.' + jwtBody + '.' + hmacBase64
});

pm.request.headers.add({
    key: 'Auth-User',
    value: pm.environment.get('AUTH_USER')
});