Image processing

[awesomejay]

We need to start handling images. I am not sure what the API should be for this. Like this?: http://datacache.org/dc/sync?source=http://datacache.org/dc/demo/file1.png&filter=convert&filterargs=-size 1024x768

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Existing code should already be able to serve images. So I guess you want to process images like re-sizing?

Image processing is CPU consuming. Since Node.js is single-threaded, this might make the server unresponsive for incoming requests for a while. We might need to fork another Node.js instance to handle image processing.

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We could just fork the processes to call a command line program. I am not sure if we should be doing

http://datacache.org/dc/sync?source=http://datacache.org/dc/demo/file1.png&filter=convert&filterargs=-size 1024x768

or if we should set up a separate service and do

http://datacache.org/dc/sync?source=http://imgconvert.org/convert%2Fsize=1024x768%26url=http://datacache.org/dc/demo/file1.png

[awesomejay]

These two approaches are both doable. Is the image convert service is going to be used by another service besides datacache? If not we don't need to expose a public interface for it.