faas/sample-functions/ResizeImageMagick

functions/resizer

Use this FaaS function to resize an image with ImageMagick.

Deploy the resizer function

(Make sure you have already deployed FaaS with ./deploy_stack.sh in the root of this Github repository.

• Option 1 - click Create a new function on the FaaS UI

• Option 2 - use the faas-cli (experimental)

# curl -SL https://github.com/alexellis/faas-cli/releases/download/0.1-alpha/faas-cli-macos > faas-cli
# chmod +x ./faas-cli

# ./faas-cli -action=deploy -image=functions/resizer -name=resizer \
  -fprocess="convert - -resize 50% fd:1"
200 OK
URL: http://localhost:8080/function/resizer

• Option 3 - use curl to deploy the function

$ curl -s --fail localhost:8080/system/functions -d \
'{ 
   "service": "resizer",
   "image": "functions/resizer",
   "envProcess": "convert - -resize 50% fd:1",
   "network": "func_functions"
   }'

Resize a picture by 50%

Now pick an image such as the included picture of Gordon and use curl or a tool of your choice to send the data to the function. Pipe the result into a new file like this:

$ curl localhost:8080/function/resizer --data-binary @gordon.png > small_gordon.png

Customize the transformation

If you want to customise the transformation then edit the Dockerfile or the fprocess variable and create a new function.

Remove the function

You can remove the function with docker service rm resizer.