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tileserver: service unavailable if outdated tile from upstream

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This commit is contained in:
Laura Klünder 2024-09-17 21:33:00 +02:00
parent 300d85e5ed
commit 87822a8426
1 changed files with 6 additions and 1 deletions
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7
src/c3nav/tileserver/wsgi.py
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@ -304,8 +304,13 @@ class TileServer:
r = requests.get('%s/map/%d/%d/%d/%d/%d/%s.png' %
(self.upstream_base, level, zoom, x, y, theme_id, access_cache_key),
headers=self.auth_headers, auth=self.http_auth)
if r.status_code == 200 and r.headers['Content-Type'] == 'image/png':
if r.headers['ETag'] != tile_etag:
error = b'outdated tile from upstream'
start_response('503 Service Unavailable', [self.get_date_header(),
('Content-Length', len(error)),
('ETag', tile_etag)])
return [error]
self.cache.set(cache_key, r.content)
return self.deliver_tile(start_response, tile_etag, r.content)