This evening I've mostly been using Sinatra to build a little file storage service which uses a REST API.

That means I can upload a file:

skx@birthday:~/hg/sinatra$ curl -X PUT -F file=@/etc/fstab http://localhost:4567/
{"id":"dbd1bdc11b5a1a8e80588a135648b4c2edffb49a","path":"/"}

Download that same file:

skx@birthday:~/hg/sinatra$ curl -X GET -F id=dbd1bdc11b5a1a8e80588a135648b4c2edffb49a  \
   http://localhost:4567/
# /etc/fstab: static file system information.
..
/dev/cdrom        /media/cdrom0   udf,iso9660 user,noauto     0       0

Get an index of files:

skx@birthday:~/hg/sinatra$ curl http://localhost:4567/
[{"id":"dbd1bdc11b5a1a8e80588a135648b4c2edffb49a","type":"file"}]

And finally we can delete a file:

skx@birthday:~/hg/sinatra$ curl -X DELETE -F "id=dbd1bdc11b5a1a8e80588a135648b4c2edffb49a" \
  http://localhost:4567/
Removed

We can also upload to different paths so we can replicate a file-system if we wanted to. (I added in "type" to hold either "file" or "directory", though I guess if we were to code up a FUSE client we'd want to store things like ctime, UID, GID, etc. THe list operation will show both files and sub-directories)

The code was trivial once I got the hang of Sinatra, and I'm pretty pleased with it so far. I don't yet need to use it for anything, but I'm thinking of unifying the way that I store images on a couple of sites - and fetching them via JSON and Javascript might be an option this was an experiment in that direction. (Though I'd probably want to hook in rsync so we replicated the eventual upload location for safety.)

In other news I've been all organized and upgraded the kernel on my guest:

steve@steve:~$ uptime
 22:00:28 up  4:18,  1 user,  load average: 0.14, 0.05, 0.05
steve@steve:~$ uname -r
3.2.0-kvm-hosting.org-i386-20120106

So for once I'm up to date with a cutting edge kernel. Happy times.

ObQuote: "How you expect to run with the wolves come night when you spend all day sparring with the puppies? " - The Wire (Omar)

Tags: json, kvm, kvm-hosting, ruby | 2 comments