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tile.py
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tile.py
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import os, sys
import tarfile
import logging
import simplejson as json
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
open_archives = {}
def open_archive(z, x):
archive_file_z = os.path.abspath("img/tiles/%s.tar.gz" % (z))
archive_file_zx = os.path.abspath("img/tiles/%s/%s.tar.gz" % (z, x))
if (os.path.exists(archive_file_z)):
logging.info("opening %s", archive_file_z)
open_archives[z] = tarfile.open(archive_file_z, 'r:gz')
elif (os.path.exists(archive_file_zx)):
open_archives["%s_%s" % (z, x)] = tarfile.open(archive_file_zx, 'r:gz')
def get_tile(z, x, y):
# TODO: add memcache support
if (not ((z in open_archives) or (("%s_%s" % (z, x)) in open_archives))):
open_archive(z, x)
if (z in open_archives):
return open_archives[z].extractfile("%s/%s/%s.png" % (z, x, y))
else:
archive_key = "%s_%s" % (z, x)
if (archive_key in open_archives):
return open_archives[archive_key].extractfile("%s/%s.png" % (x, y))
return None
class LoadTileHandler(webapp.RequestHandler):
def get(self, z, x, y):
self.response.headers['Content-Type'] = 'image/png'
# get the tile
requested_tile = get_tile(z, x, y)
if requested_tile:
self.response.out.write(requested_tile.read())
application = webapp.WSGIApplication(
[(r'/tile/(\d+)/(\d+)/(\d+).png', LoadTileHandler)],
debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()