Add HTTP retry strategy for server connection failures

Implement automatic retry with exponential backoff (up to 30 attempts)
for 502/503/504 errors. Prevents container crash-loop during server
outages, reducing kernel log spam from repeated restarts.

Dockerfile

@@ -13,7 +13,7 @@ RUN curl https://linux-clients.seafile.com/seafile.asc | apt-key add - && \
 
 # Use virtual environment
 ENV VIRTUAL_ENV=/opt/venv
-RUN python3 -m venv $VIRTUAL_ENV
+RUN python3 -m venv --system-site-packages $VIRTUAL_ENV
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
 # Install app requirements

dsc/client.py

@@ -8,6 +8,9 @@ from urllib.parse import urlparse
 
 from cached_property import cached_property_with_ttl
 import requests
+from requests.adapters import HTTPAdapter
+from urllib3.util.retry import Retry
+import seafile
 
 from dsc import const
 from dsc.misc import create_dir, hide_password
@@ -21,13 +24,36 @@ class SeafileClient:
                  user: str,
                  passwd: str,
                  app_dir: str = const.DEFAULT_APP_DIR):
-        up = urlparse(requests.get(f"http://{host}").url)
-        self.url = f"{up.scheme}://{up.netloc}"
         self.user = user
         self.password = passwd
         self.app_dir = os.path.abspath(app_dir)
+        self.rpc = seafile.RpcClient(os.path.join(self.app_dir, 'seafile-data', 'seafile.sock'))
         self.__token = None
 
+        # determine server URL (assume HTTPS unless explicitly specified)
+        if host.startswith('http://') or host.startswith('https://'):
+            self.url = host.rstrip('/')
+        else:
+            self.url = f"https://{host}"
+
+        # configure session with retry strategy
+        # enable urllib3 retry logging at DEBUG level (shows retry attempts)
+        urllib3_logger = logging.getLogger("urllib3.connectionpool")
+        urllib3_logger.setLevel(logging.DEBUG)
+        urllib3_logger.propagate = True
+
+        self.session = requests.Session()
+        retry_strategy = Retry(
+            total=30,
+            backoff_factor=2,
+            backoff_max=60,
+            status_forcelist=[500, 502, 503, 504],
+            allowed_methods=["GET", "POST"]
+        )
+        adapter = HTTPAdapter(max_retries=retry_strategy)
+        self.session.mount("http://", adapter)
+        self.session.mount("https://", adapter)
+
     def __str__(self):
         return f"SeafileClient({self.user}@{self.url})"
 
@@ -39,7 +65,7 @@ class SeafileClient:
         if self.__token is None:
             url = f"{self.url}/api2/auth-token/"
             _lg.info("Fetching token: %s", url)
-            r = requests.post(url, data={"username": self.user, "password": self.password})
+            r = self.session.post(url, data={"username": self.user, "password": self.password})
             if r.status_code != 200:
                 raise RuntimeError(f"Can't get token: {r.text}")
             self.__token = r.json()["token"]
@@ -50,7 +76,7 @@ class SeafileClient:
         url = f"{self.url}/api2/repos/"
         _lg.info("Fetching remote libraries: %s", url)
         auth_header = {"Authorization": f"Token {self.token}"}
-        r = requests.get(url, headers=auth_header)
+        r = self.session.get(url, headers=auth_header)
         if r.status_code != 200:
             raise RuntimeError(r.text)
         r_libs = {lib["id"]: lib["name"] for lib in r.json()}
@@ -129,31 +155,84 @@ class SeafileClient:
         )
         subprocess.run(self.__gen_cmd(" ".join(cmd)))
 
-    def get_status(self):
+    def __print_tx_task(self, tx_task) -> str:
-        cmd = "seaf-cli status"
+        """ Print transfer task status """
-        _lg.debug("Fetching seafile client status: %s", cmd)
+        try:
-        out = subprocess.check_output(self.__gen_cmd(cmd))
+            percentage = tx_task.block_done / tx_task.block_total * 100
-        out = out.decode().splitlines()
+            tx_rate = tx_task.rate / 1024.0
+            return f" {percentage:.1f}%, {tx_rate:.1f}KB/s"
+        except ZeroDivisionError:
+            return ""
 
+    def get_status(self) -> dict:
+        """ Get status of all libraries """
         statuses = dict()
-        for line in out:
+
-            if line.startswith("#") or not line.strip():
+        # fetch statuses of libraries being cloned
+        tasks = self.rpc.get_clone_tasks()
+        for clone_task in tasks:
+            if clone_task.state == "done":
                 continue
-            lib, status = line.split(sep="\t", maxsplit=1)
+
-            lib = lib.strip()
+            elif clone_task.state == "fetch":
-            status = " ".join(status.split())
+                statuses[clone_task.repo_name] = "downloading"
-            statuses[lib] = status
+                tx_task = self.rpc.find_transfer_task(clone_task.repo_id)
+                statuses[clone_task.repo_name] += self.__print_tx_task(tx_task)
+
+            elif clone_task.state == "error":
+                err = self.rpc.sync_error_id_to_str(clone_task.error)
+                statuses[clone_task.repo_name] = f"error: {err}"
+
+            else:
+                statuses[clone_task.repo_name] = clone_task.state
+
+        # fetch statuses of synced libraries
+        repos = self.rpc.get_repo_list(-1, -1)
+        for repo in repos:
+            auto_sync_enabled = self.rpc.is_auto_sync_enabled()
+            if not auto_sync_enabled or not repo.auto_sync:
+                statuses[repo.name] = "auto sync disabled"
+                continue
+
+            sync_task = self.rpc.get_repo_sync_task(repo.id)
+            if sync_task is None:
+                statuses[repo.name] = "waiting for sync"
+
+            elif sync_task.state in ("uploading", "downloading"):
+                statuses[repo.name] = sync_task.state
+                tx_task = self.rpc.find_transfer_task(repo.id)
+
+                if sync_task.state == "downloading":
+                    if tx_task.rt_state == "data":
+                        statuses[repo.name] += " files"
+                    elif tx_task.rt_state == "fs":
+                        statuses[repo.name] += " file list"
+
+                statuses[repo.name] += self.__print_tx_task(tx_task)
+
+            elif sync_task.state == "error":
+                err = self.rpc.sync_error_id_to_str(sync_task.error)
+                statuses[repo.name] = f"error: {err}"
+
+            else:
+                statuses[repo.name] = sync_task.state
+
         return statuses
 
     def watch_status(self):
         prev_status = dict()
+        max_name_len = 0
+        fmt = "Library {:%ds} {}" % max_name_len
         while True:
             time.sleep(const.STATUS_POLL_PERIOD)
             cur_status = self.get_status()
-            for folder, state in cur_status.items():
+            for library, state in cur_status.items():
-                if state != prev_status.get(folder):
+                if state != prev_status.get(library):
-                    logging.info("Library %s:\t%s", folder, state)
+                    if 30 > len(library) > max_name_len:
-                prev_status[folder] = cur_status[folder]
+                        max_name_len = len(library)
+                        fmt = "Library {:%ds}    {}" % max_name_len
+                    logging.info(fmt.format(library, state))
+                prev_status[library] = cur_status[library]
 
     def get_local_libraries(self) -> set:
         cmd = "seaf-cli list"

requirements.txt

@@ -1,2 +1,2 @@
 cached_property==1.5.2
-requests==2.31.0
+requests==2.32.4