greggy/lara-schach-live
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Fix caching issue - load fresh PGN for current round

Browse Source
This commit is contained in:
Martin
2026-05-24 16:57:16 +02:00
parent 812cd3b24f
commit 3944c7d5bb
3 changed files with 111 additions and 81 deletions
Download Patch File Download Diff File Expand all files Collapse all files

106
server.py
View File

@@ -25,73 +25,70 @@ CACHE_TTL = int(os.environ.get("CACHE_TTL", 31))
os.makedirs(CACHE_DIR, exist_ok=True)
last_fetch_time = None
last_standings_fetch_time = None
current_round = 0 # wird aus der Tabelle ermittelt
def get_pgn_url():
return f"https://www.deutsche-schachjugend.de/2026/odjm-d/partien/{current_round}.pgn"
def get_pgn_url(round_num=None):
if round_num is None:
round_num = current_round
return f"https://www.deutsche-schachjugend.de/2026/odjm-d/partien/{round_num}.pgn"
def get_cache_file():
return os.path.join(CACHE_DIR, f"runde-{current_round}.pgn")
def get_cache_file(round_num=None):
if round_num is None:
round_num = current_round
return os.path.join(CACHE_DIR, f"runde-{round_num}.pgn")
def fetch_pgn():
def fetch_pgn(round_num=None):
"""Lädt die PGN-Datei von der URL als Bytes.
Nutzt If-Modified-Since – gibt (data, changed) zurück.
changed=False bedeutet 304 Not Modified (keine neuen Daten)."""
global last_fetch_time
if current_round == 0:
Gibt (data, True) bei Erfolg oder (None, False) bei Fehler zurück."""
if round_num is None:
round_num = current_round
if round_num == 0:
return None, False
url = get_pgn_url()
url = get_pgn_url(round_num)
try:
headers = {"User-Agent": "Mozilla/5.0"}
if last_fetch_time:
headers["If-Modified-Since"] = datetime.utcfromtimestamp(last_fetch_time).strftime("%a, %d %b %Y %H:%M:%S GMT")
req = urllib.request.Request(url, headers=headers)
with urllib.request.urlopen(req, timeout=31) as response:
data = response.read()
last_fetch_time = time.time()
return data, True
except urllib.error.HTTPError as e:
if e.code == 304:
return None, False
print(f"[{datetime.now().strftime('%H:%M:%S')}] HTTP-Fehler: {e}")
print(f"[{datetime.now().strftime('%H:%M:%S')}] HTTP-Fehler (Runde {round_num}): {e}")
return None, False
except Exception as e:
print(f"[{datetime.now().strftime('%H:%M:%S')}] Fehler beim Laden: {e}")
print(f"[{datetime.now().strftime('%H:%M:%S')}] Fehler beim Laden (Runde {round_num}): {e}")
return None, False
def get_pgn_content_longpoll(since=0):
"""Long-Poll: Blockiert, bis sich die PGN-Datei tatsächlich ändert.
Antwortet nur bei neuen Daten, nie mit unverändertem Stand."""
while True:
cache_file = get_cache_file()
if os.path.exists(cache_file):
mtime = os.path.getmtime(cache_file)
if mtime > since:
with open(cache_file, "rb") as f:
return f.read(), mtime
age = time.time() - mtime
if age >= CACHE_TTL:
content, changed = fetch_pgn()
if changed and content is not None:
with open(cache_file, "wb") as f:
f.write(content)
new_mtime = os.path.getmtime(cache_file)
print(f"[{datetime.now().strftime('%H:%M:%S')}] PGN via Long-Poll aktualisiert ({len(content)} Bytes)")
return content, new_mtime
else:
content, changed = fetch_pgn()
if changed and content is not None:
with open(cache_file, "wb") as f:
f.write(content)
return content, os.path.getmtime(cache_file)
def get_round_pgn(round_num):
"""Gibt PGN-Daten für eine Runde zurück.
Bei der aktuellen Runde wird immer live von der DSJ geholt."""
cache_file = get_cache_file(round_num)
time.sleep(5)
if round_num == current_round:
content, changed = fetch_pgn(round_num)
if changed and content is not None:
with open(cache_file, "wb") as f:
f.write(content)
return content, os.path.getmtime(cache_file)
if os.path.exists(cache_file):
with open(cache_file, "rb") as f:
return f.read(), os.path.getmtime(cache_file)
return None, 0
if os.path.exists(cache_file):
with open(cache_file, "rb") as f:
return f.read(), os.path.getmtime(cache_file)
content, changed = fetch_pgn(round_num)
if changed and content is not None:
with open(cache_file, "wb") as f:
f.write(content)
return content, os.path.getmtime(cache_file)
return None, 0
def fetch_standings():
@@ -165,19 +162,27 @@ class PGNHandler(http.server.BaseHTTPRequestHandler):
parts = parsed_path.path.strip("/").split("/")
if len(parts) == 2 and parts[0] == "pgn" and parts[1].isdigit():
params = urllib.parse.parse_qs(parsed_path.query)
since = float(params.get("since", [0])[0])
content, mtime = get_pgn_content_longpoll(since)
round_num = int(parts[1])
if round_num <= 0 or round_num > current_round + 1:
self.send_response(404)
self.send_header("Content-Type", "application/json")
self.send_header("Access-Control-Allow-Origin", "*")
self.end_headers()
self.wfile.write(json.dumps({"error": "Runde nicht verf\u00fcgbar"}).encode())
return
content, mtime = get_round_pgn(round_num)
if content:
self.send_response(200)
self.send_header("Content-Type", "text/plain; charset=utf-8")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Cache-Control", "no-cache")
self.send_header("X-Cache-Mtime", str(mtime))
self.end_headers()
self.wfile.write(content)
else:
self.send_response(502)
self.send_response(404)
self.send_header("Content-Type", "application/json")
self.send_header("Access-Control-Allow-Origin", "*")
self.end_headers()
@@ -191,8 +196,6 @@ class PGNHandler(http.server.BaseHTTPRequestHandler):
self.end_headers()
status = {
"status": "ok",
"last_fetch": last_fetch_time,
"cache_ttl": CACHE_TTL,
"server_time": time.time()
}
self.wfile.write(json.dumps(status).encode())
@@ -259,6 +262,7 @@ def background_refresh():
cache_file = get_cache_file()
with open(cache_file, "wb") as f:
f.write(content)
print(f"[{datetime.now().strftime('%H:%M:%S')}] Hintergrund-Refresh: PGN aktualisiert ({len(content)} Bytes)")
except Exception as e:
print(f"[{datetime.now().strftime('%H:%M:%S')}] Hintergrund-Refresh Fehler: {e}")