Imgry

Imgry is an on-demand image delivery web service for responsive applications.

Usage

First install Go 1.4+ and copy the etc/imgry.conf.sample (the default is fine), then..

cd imgry/
make tools
make deps
make build
./bin/imgry-server -config=etc/imgry.conf

Open browser to:

http://localhost:4446/mybucket?url=http://i.imgur.com/vEZy2Oh.jpg

this will download the image from the source, cache it, persist it, and return the sized image (in this case, with zero sizing) to the client.

Now, some other variations:

Scale to 300x

http://localhost:4446/mybucket?url=http://i.imgur.com/vEZy2Oh.jpg&size=300x

Resize to exactly 300x300

http://localhost:4446/mybucket?url=http://i.imgur.com/vEZy2Oh.jpg&size=300x300

Resize to 300x300 and maintain aspect ratio

http://localhost:4446/mybucket?url=http://i.imgur.com/vEZy2Oh.jpg&size=300x300&op=cover

Same as above with a cropbox at points (x1:10%,y1:10%) to (x2:90%,y2:90%)

http://localhost:4446/mybucket?url=http://i.imgur.com/vEZy2Oh.jpg&size=300x300&op=cover&cb=0.1,0.1,0.9,0.9

Webapp usage

<img src="http://localhost:4446/mybucket?url=http%3A%2F%2Fi.imgur.com%2FvEZy2Oh.jpg&size=300x300&op=cover" />

Caching and persistence

Imgry is built with some clever caching such as:

A layered cache store that stores/loads data from memory > on-disk (boltdb) > s3
Once an image has been downloaded once, every other sizing operation will be loaded from the chainstore
Saving to the on-disk and s3 layers are done in the background
Hashing of the sizing operations to find already sized images
Redisdb is used for storing the bucket information of images sized

Deployment

A Dockerfile is packaged with the project that includes a custom build of ImageMagick 6.9 with the latest libjpeg-turbo and libpng.

We use github.com/siddontang/ledisdb in production instead of redisdb. It's an Redis-API compatible engine that is designed for long-term persistence of the data set.. pretty much Redis on LevelDB.

Other

Imgry and its sizing operations can be used as a library, without the API server
Imgry supports pluggable image processing engines, but for now comes packaged with an ImageMagick engine by default (imgry/imagick)

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

sethdford / imgry