timeouts fuer dav gesetzt

.env

@@ -10,3 +10,7 @@ CALDAV_URL=https://dav.mailbox.org/caldav/Y2FsOi8vMC8zMg
 CALDAV_USERNAME=minitux@mailbox.org
 CALDAV_PASSWORD=4711Cayenne64
 
+CALDAV_TIMEOUT=90
+CALDAV_RETRIES=3
+CALDAV_RETRY_BACKOFF=5
+

.env.example

@@ -9,3 +9,8 @@ IMAP_MARK_AS_READ=false
 CALDAV_URL=https://dav.mailbox.org/caldav/IHR_KALENDER_ID
 CALDAV_USERNAME=ihr-name@mailbox.org
 CALDAV_PASSWORD=IHR_PASSWORT_ODER_APP_PASSWORT
+
+Optionale .env-Werte:
+CALDAV_TIMEOUT=90
+CALDAV_RETRIES=3
+CALDAV_RETRY_BACKOFF=5

ics_mail_importer.py

@@ -1,15 +1,19 @@
 #!/usr/bin/env python3
 """
-ics_mail_importer_env_v5.py
+ics_mail_importer_env_v6.py
 ---------------------------
 ICS-Importer für mailbox.org / CalDAV.
 
-Verbesserungen in v4:
+Verbesserungen in v6:
-- Liest Mails per BODY.PEEK[] ohne automatisches Setzen von \Seen
+- CAL-4121-Konflikte werden als "bereits aktueller Serverstand" behandelt
-- Markiert nur verarbeitete ICS-Mails optional als gelesen
+- Timeout-Fehler beim CalDAV-Upload werden mit Retries und Backoff erneut versucht
-- Behandelt mailbox.org / OX-Konflikte vom Typ CAL-4121 (neuere Version existiert)
+- Netzwerk-/Timeout-Probleme werden getrennt von fachlichen Importfehlern protokolliert
-  als nicht-fatale Konflikte statt als Importfehler
+- Mails werden nur bei erfolgreicher Verarbeitung oder erkanntem Konflikt als verarbeitet markiert
-- Protokolliert Konflikte klar als "bereits neuer vorhanden"
+
+Optionale .env-Werte:
+- CALDAV_TIMEOUT=90
+- CALDAV_RETRIES=3
+- CALDAV_RETRY_BACKOFF=5
 """
 
 import imaplib
@@ -17,6 +21,7 @@ import email
 import logging
 import hashlib
 import os
+import time
 from pathlib import Path
 from datetime import datetime, timezone
 
@@ -53,36 +58,105 @@ def env_bool(name: str, default: str = "false") -> bool:
     return os.getenv(name, default).strip().lower() in {"1", "true", "yes", "on"}
 
 
+def env_int(name: str, default: int) -> int:
+    value = os.getenv(name)
+    if value is None or not value.strip():
+        return default
+    return int(value.strip())
+
+
+def exception_text(exc: Exception) -> str:
+    return str(exc or "")
+
+
 def is_newer_version_conflict(exc: Exception) -> bool:
-    message = str(exc or "").lower()
+    message = exception_text(exc).lower()
     patterns = [
         "412 precondition failed",
         "cal-4121",
         "newer version of the appointment already exists",
         "concurrent modification",
-        "client sequence",
         "actual sequence",
+        "client sequence",
     ]
-    matches = sum(1 for p in patterns if p in message)
+    return sum(1 for pattern in patterns if pattern in message) >= 2
-    return matches >= 2
+
+
+def is_timeout_error(exc: Exception) -> bool:
+    message = exception_text(exc).lower()
+    timeout_patterns = [
+        "read timed out",
+        "timeout",
+        "timed out",
+        "read timeout",
+    ]
+    return any(pattern in message for pattern in timeout_patterns)
+
+
+def add_event_with_retries(calendar, ical_text: str, summary: str, uid: str, sequence, timeout: int, retries: int, backoff: int):
+    last_exception = None
+
+    for attempt in range(1, retries + 1):
+        try:
+            calendar.add_event(ical_text)
+            log.info(f"    ✓ Termin importiert: {summary} [{uid[:20]}]")
+            return "imported"
+        except Exception as e:
+            last_exception = e
+            exc_name = type(e).__name__
+            exc_message = exception_text(e)
+            log.info(f"    Exception-Typ beim Import: {exc_name}")
+
+            if is_newer_version_conflict(e):
+                log.info(
+                    f"    ↷ Konflikt ignoriert: Neuere Version existiert bereits: {summary} "
+                    f"[{uid[:20]}], SEQUENCE={sequence}"
+                )
+                return "conflict"
+
+            if is_timeout_error(e):
+                if attempt < retries:
+                    wait_seconds = backoff * attempt
+                    log.warning(
+                        f"    ⏳ Timeout beim Import von {uid[:20]} (Versuch {attempt}/{retries}, Timeout={timeout}s). "
+                        f"Neuer Versuch in {wait_seconds}s ..."
+                    )
+                    time.sleep(wait_seconds)
+                    continue
+                log.warning(
+                    f"    ✗ Timeout beim Import von {uid[:20]} nach {retries} Versuchen: {exc_message}"
+                )
+                return "timeout"
+
+            log.warning(f"    ✗ Fehler beim Import von {uid[:20]}: {exc_message}")
+            return "error"
+
+    if last_exception is not None:
+        raise last_exception
+    return "error"
 
 
 def import_ics_to_caldav(ics_bytes: bytes, uid_hash: str):
     caldav_url = os.getenv("CALDAV_URL")
     username = os.getenv("CALDAV_USERNAME")
     password = os.getenv("CALDAV_PASSWORD")
+    timeout = env_int("CALDAV_TIMEOUT", 90)
+    retries = env_int("CALDAV_RETRIES", 3)
+    backoff = env_int("CALDAV_RETRY_BACKOFF", 5)
 
     if not caldav_url or not username or not password:
         raise RuntimeError(
             "CALDAV_URL, CALDAV_USERNAME oder CALDAV_PASSWORD fehlt in .env"
         )
 
-    client = caldav.DAVClient(url=caldav_url, username=username, password=password)
+    client = caldav.DAVClient(url=caldav_url, username=username, password=password, timeout=timeout)
     calendar = client.calendar(url=caldav_url)
     cal = Calendar.from_ical(ics_bytes)
 
     imported = 0
     conflicts = 0
+    timeouts = 0
+    errors = 0
 
     for component in cal.walk():
         if component.name != "VEVENT":
@@ -93,25 +167,30 @@ def import_ics_to_caldav(ics_bytes: bytes, uid_hash: str):
         single_cal.add("version", "2.0")
         single_cal.add_component(component)
 
-        uid = str(component.get("uid", uid_hash + f"-{imported + conflicts}"))
+        uid = str(component.get("uid", uid_hash + f"-{imported + conflicts + timeouts + errors}"))
-        summary = component.get("summary", "(kein Titel)")
+        summary = str(component.get("summary", "(kein Titel)"))
         sequence = component.get("sequence", "(keine sequence)")
+        result = add_event_with_retries(
+            calendar,
+            single_cal.to_ical().decode("utf-8"),
+            summary,
+            uid,
+            sequence,
+            timeout,
+            retries,
+            backoff,
+        )
 
-        try:
+        if result == "imported":
-            calendar.add_event(single_cal.to_ical().decode("utf-8"))
-            log.info(f"    ✓ Termin importiert: {summary} [{uid[:20]}]")
             imported += 1
-        except Exception as e:
+        elif result == "conflict":
-            if is_newer_version_conflict(e):
+            conflicts += 1
-                log.info(
+        elif result == "timeout":
-                    f"    ↷ Konflikt ignoriert: Neuere Version existiert bereits: {summary} "
+            timeouts += 1
-                    f"[{uid[:20]}], SEQUENCE={sequence}"
+        else:
-                )
+            errors += 1
-                conflicts += 1
-            else:
-                log.warning(f"    ✗ Fehler beim Import von {uid[:20]}: {e}")
 
-    return imported, conflicts
+    return imported, conflicts, timeouts, errors
 
 
 def process_mailbox():
@@ -143,6 +222,8 @@ def process_mailbox():
     imported_hashes = load_seen_uids()
     total_imported = 0
     total_conflicts = 0
+    total_timeouts = 0
+    total_errors = 0
     processed_mail_count = 0
 
     for msg_uid in message_uids:
@@ -181,9 +262,11 @@ def process_mailbox():
             log.info(f"  ICS-Anhang gefunden: {filename!r} ({uid_hash[:12]}…)")
 
             try:
-                imported_count, conflict_count = import_ics_to_caldav(ics_bytes, uid_hash)
+                imported_count, conflict_count, timeout_count, error_count = import_ics_to_caldav(ics_bytes, uid_hash)
                 total_imported += imported_count
                 total_conflicts += conflict_count
+                total_timeouts += timeout_count
+                total_errors += error_count
 
                 if imported_count > 0 or conflict_count > 0:
                     save_uid(uid_hash)
@@ -191,7 +274,7 @@ def process_mailbox():
                     mail_processed = True
                 else:
                     log.warning(
-                        f"  Kein VEVENT importiert oder als Konflikt erkannt für Anhang {filename!r}; Mail bleibt ungelesen."
+                        f"  Kein VEVENT erfolgreich verarbeitet für Anhang {filename!r}; Mail bleibt ungelesen."
                     )
             except Exception as e:
                 log.warning(
@@ -215,6 +298,8 @@ def process_mailbox():
 
     log.info(f"Fertig. {total_imported} Termin(e) importiert.")
     log.info(f"{total_conflicts} Konflikt(e) als bereits aktueller Serverstand erkannt.")
+    log.info(f"{total_timeouts} Timeout-Fall/Fälle beim CalDAV-Upload.")
+    log.info(f"{total_errors} sonstige Fehler beim CalDAV-Upload.")
     log.info(f"{processed_mail_count} Mail(s) als gelesen markiert.")