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tileserver: complete request handling, but without caching so far

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This commit is contained in:
Laura Klünder 2017-11-21 00:47:55 +01:00
parent 7ccfe058f6
commit 0f6b372b92
1 changed files with 45 additions and 6 deletions
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51
src/c3nav/tileserver/wsgi.py
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@ -3,11 +3,14 @@ import logging
import os
import re
import time
from http.cookies import SimpleCookie
from io import BytesIO
import requests
from c3nav.mapdata.utils.cache import CachePackage
from c3nav.mapdata.utils.tiles import (build_access_cache_key, build_base_cache_key, build_tile_etag, get_tile_bounds,
parse_tile_access_cookie)
logging.basicConfig(level=logging.DEBUG if os.environ.get('C3NAV_DEBUG') else logging.INFO,
format='[%(asctime)s] [%(process)s] [%(levelname)s] %(name)s: %(message)s',
@ -92,15 +95,51 @@ class TileServer:
return self.not_found(start_response, b'zoom out of bounds.')
# do this to be thread safe
cache_package = self.cache_package # noqa
cache_package = self.cache_package
x = int(match.group('x')) # noqa
y = int(match.group('y')) # noqa
# check if bounds are valid
x = int(match.group('x'))
y = int(match.group('y'))
minx, miny, maxx, maxy = get_tile_bounds(zoom, x, y)
if not cache_package.bounds_valid(minx, miny, maxx, maxy):
return self.not_found(start_response, b'coordinates out of bounds.')
level = int(match.group('level')) # noqa
# get level
level = int(match.group('level'))
level_data = cache_package.levels.get(level)
if level_data is None:
return self.not_found(start_response, b'invalid level.')
start_response('200 OK', [('Content-Type', 'text/plain')])
return [b'mau?']
# decode access permissions
try:
cookie = SimpleCookie(env['HTTP_COOKIE'])['c3nav_tile_access'].value
except KeyError:
access_permissions = set()
else:
access_permissions = parse_tile_access_cookie(cookie, self.tile_secret)
# only access permissions that are affecting this tile
access_permissions &= set(level_data.restrictions[minx:miny, maxx:maxy])
# build cache keys
last_update = level_data.history.last_update(minx, miny, maxx, maxy)
base_cache_key = build_base_cache_key(last_update)
access_cache_key = build_access_cache_key(access_permissions)
# check browser cache
tile_etag = build_tile_etag(level, zoom, x, y, base_cache_key, access_cache_key, self.tile_secret)
if_none_match = env.get('HTTP_IF_NONE_MATCH')
if if_none_match == tile_etag:
start_response('304 Not Modified', [('Content-Type', 'text/plain'), ('ETag', tile_etag)])
return [b'']
r = requests.get('%s/map/%d/%d/%d/%d/%s.png' % (self.upstream_base, level, zoom, x, y, access_cache_key),
headers=self.auth_headers)
start_response('%d %s' % (r.status_code, r.reason),
[('Content-Type', r.headers['Content-Type']),
('ETag', r.headers['ETag'])])
return [r.content]
application = TileServer()