transformimgs

TransformImgs

Image transformations web service. Provides Http API to image manipulation operations backed by Imagemagick CLI.

Table of Contents

• Features
• Install
• Usage
• API
• Contribute
• License
• TODO

Features

• Resize/optimises/crops raster (PNG and JPEG) images.
• AVIF/WebP support based on "Accept" header.
• Sets "Cache-Control" header in a response. Cache TTL is configurable through command line flag "-cache".
• Execution queue that will create number of executors based on number of CPUs or can be configured through "-proc" flag.
• Supports "Vary" header to cache responses based on the output format.

Install

Using docker:

$ docker pull pixboost/transformimgs

Usage

$ docker run -p 8080:8080 pixboost/transformimgs

To test that application started successfully:

$ curl http://localhost:8080/health

You should get 'OK' string in the response.

At the moment application provides 4 HTTP endpoints:

• /img/{IMG_URL}/optimise - optimises image
• /img/{IMG_URL}/resize - resizes image
• /img/{IMG_URL}/fit - resize image to the exact size by resizing and cropping it
• /img/{IMG_URL}/asis - returns original image

Detailed API docs are here - https://pixboost.com/docs/api/

Running the application locally from sources

$ docker-compose up

Building and Running from sources

Dependencies:

• Go 1.8+
• Gorilla MUX for HTTP routing
• kolibri for healthcheck and testing
• glogi for logging interface
• Installed imagemagick

$ go get github.com/golang/dep/cmd/dep
$ go get github.com/Pixboost/transformimgs
$ cd $GOPATH/src/github.com/Pixboost/transformimgs
$ ./run.sh 

Perfomance tests

There is a JMeter performance test you can run against a service. To run tests:

• Run performance test environment:

$ docker-compose -f docker-compose-perf.yml up

• Run JMeter test:

$ jmeter -n -t perf-test.jmx -l ./results.jmx -e -o ./results

• Run JMeter WebP test:

$ jmeter -n -t perf-test-webp.jmx -l ./results-webp.jmx -e -o ./results-webp

• Run JMeter AVIF test:

$ jmeter -n -t perf-test-avif.jmx -l ./results-avif.jmx -e -o ./results-avif

API

You can go through API docs and try it out there as well. Use API key MTg4MjMxMzM3MA__ to transform any images from pixabay.com.

Go-swagger is used to generate swagger.json file from sources. To generate:

$ go get -u github.com/go-swagger/go-swagger/cmd/swagger
$ cd cmd/
$ swagger generate spec -o ../swagger.json

Contribute

Shout out with any ideas. PRs are more than welcome.

License

MIT

Todo

• Add JpegXR support (IE supports WEBP)
• Add Jpeg 2000 support
• Consider using Zopfli or Brotli for PNGs
• Add SVG support
• Add GIF support