An image proxy that can resize images from an upstream server and store the source and target images locally for quick response times. In a Kubernetes cluster with multiple replicas ixy synchronizes the source and target images between all replicas.

Quickstart with KinD

$ ./scripts/quickstart.sh
$ google-chrome http://127.0.0.1:30080 # UI
$ curl -o /dev/null \
       -s \
       -w 'Establish Connection: %{time_connect}s\nTTFB: %{time_starttransfer}s\nTotal: %{time_total}s\n' \
       http://127.0.0.1:8080/200/200/300/300

Quickstart with Docker

$ docker compose up &
$ curl -o /dev/null \
       -s \
       -w 'Establish Connection: %{time_connect}s\nTTFB: %{time_starttransfer}s\nTotal: %{time_total}s\n' \
       http://127.0.0.1:8080/200/200/300/300

Usage

The URL are parsed as followed:

http://127.0.0.1:8080/200/200/g:n/300/300
                     |___|___|___|_______|
                       |   |   |     |
target image width ----+   |   |     |
target image height -------+   |     |
gravity for crop: center ------+     |
source image path -------------------+

If image width or height is set to 0 the aspect ratio is retained. If both are 0 the source image is returned.

The gravity (g) argument is optional and it can also take the following values:

• n: North
• e: East
• w: West
• s: South

Instead of gravity you can also use a strategy (s) argument:

• a: Attention
• e: Entropy

For more details on how crops are applied with these arguments read the Sharp documentation.

UI

The UI is only available in Kubernetes environment and will reflect the available pods and their synchronization states:

Environment variables

• DEBUG: Enable debug logging
• BASE_URL: The base URL of the upstream server
• MAX_WIDTH: The maximum width of the target image (Default: 2000)
• MAX_HEIGHT: The maximum height of the target image (Default: 2000)
• MAX_SIZE: The maximum size of the source image in megabytes (Default: 5)
• REVALIDATE_TIME: The time in minutes for checking the source image for changes after its last access (Default: 30)
• TIMEOUT: The timeout in seconds when fetching source images (Default: 15)
• MAX_REDIRECTS: The maximum number of redirects when fetching source images (Default: 5)
• CACHE_DIR: The directory to store the source and target images in (Default: /home/node/cache)
• CACHE_CONTROL_MAX_AGE: The maximum age of the cache in days (Default: 365)