A simple bottle-based webapp deployed on my personal site, img.jonprovolone.ca. It does some image-thumbnailing and some basic templating of pages.

Upload some images and then...

# get the image as stored on disk
GET /img/file/foo.jpg

# scale the image proportionally to...
GET /img/file/foo.jpg/600w      # ... 600px wide
GET /img/file/foo.jpg/600h      # ... 600px high
GET /img/file/foo.jpg/600       # ... the smaller of 600px wide or high
GET /img/file/foo.jpg/600s      # ... the larger of 600px wide or high, then crop square

GET /img/show/foo.jpg           # HTML page with image details

# HTML listing of thumbnails...
GET /img/list/                  # ... of the first x (defaults to 8) images
GET /img/list/4+10              # ... of 10 images, skipping the first 4
GET /img/list/:cat              # ... of the first x images tagged with 'cat'
GET /img/list/:cat/4+10         # ... of 10 'cat'-tagged images, skipping the first 4

Scaled images are cached on the server, hopefully we play nice with HTTP cache control mechanisms.

virtualenv is probably best

Requirements:

• bottle (I am using 0.11.6)
• Pillow (I am using 2.1.0)
• libjpeg-devel (in order for Pillow to decode JPEGs)

Executing ijpca.py will currently use bottle's built-in server. On Dreamhost this will be served by Passenger via Apache.

• Rethink the "only one updater" behaviour: sometimes one of the non-updater processes seems to handle a bunch of requests in a row -- if at that time its metadata is out of date it will pull in the cached copy. If the cached copy is also old, subsequent requests will have it loading and re-loading that expired cached copy from disk.
  • Maybe do it on site start-up? I wonder how long passenger keeps these processes up?
  • Maybe just do it by a cronjob and the active applications don't do any updating.
• image detail page (several size links, EXIF data, tags, prev/next links)
• pull tags from EXIF
• js-load newer (not just older) images
• log rotation
• Restrict the thumbnailing to some subset of possible sizes
• thumbnail cache aging/eviction
• locking for thumbnail writing? (passenger spawns multiple processes)
• examine bottle's cache-control settings
• bottle 0.12's templating is nicer