Lenna - Image Delivery Service

Responsive images are landing soon and many organizations are looking for ways to resize images. Lenna is used in Flipkart for resizing images on the fly. The high CPU requirement due to resizing requires images to be cached on the CDN. Lenna can resize and alter the quality of the image. Currently support for jpeg, webp, png and gif has been provided.

The service makes remote calls to the storage system which hosts the original image which needs to be resized. The remote network call is wrapped around hystrix which enables a better insight into the system.

Runtime Dependencies

• go 1.3
• beego
• libmagickwand5
• libmagickwand-dev

Development Setup Instructions on OSX

Requirements

• brew Install Instructions
• git brew install git
• XCode Command Line tools xcode-select --install
• go Install Instructions
• imagemagick brew install imagemagick
• magickwand brew install magickwand
• Preferred IDE: IntelliJ 13.1.3+ (using vim/emacs/atom/mate/sublime is fine too)

Setup Development and Production Environment

• Clone the git repo: git clone --recursive git@github.com:Flipkart/Lenna.git
• Change to root project directory
• Set Environment Variables export GOROOT= `export GOPATH=pwd
• Build cd src/Lenna go build
• Run go run main.go

Setup IntelliJ

• Install golang plugin - 0.9.15+
• Setup Run Configuration for Go Application
• Set environment variables PATH=/usr/local/bin:/usr/bin:$PATH;GOPATH=<product_base_directory>/Lenna;GOROOT=;
• Set script to run: <product_base_directory>/src/Lenna/main.go

Setup hot code replace (bee tool)

• Set GOPATH to go home: export GOPATH=/usr/local/go
• Install bee tool: go get github.com/beego/bee
• bee tool documentation: http://beego.me/docs/install/bee.md