fix timeout use for replication timeout

The timeout parameter is no longer taken into account since
pyosmium switched to the requests library. This adds the parameter
back.

nominatim/clicmd/replication.py

@@ -148,7 +148,7 @@ class UpdateReplication:
         while True:
             with connect(args.config.get_libpq_dsn()) as conn:
                 start = dt.datetime.now(dt.timezone.utc)
-                state = replication.update(conn, params)
+                state = replication.update(conn, params, socket_timeout=args.socket_timeout)
                 if state is not replication.UpdateState.NO_CHANGES:
                     status.log_status(conn, start, 'import')
                 batchdate, _, _ = status.get_status(conn)

nominatim/tools/replication.py

@@ -7,13 +7,16 @@
 """
 Functions for updating a database from a replication source.
 """
-from typing import ContextManager, MutableMapping, Any, Generator, cast
+from typing import ContextManager, MutableMapping, Any, Generator, cast, Iterator
 from contextlib import contextmanager
 import datetime as dt
 from enum import Enum
 import logging
 import time
+import types
+import urllib.request as urlrequest
 
+import requests
 from nominatim.db import status
 from nominatim.db.connection import Connection
 from nominatim.tools.exec_utils import run_osm2pgsql
@@ -22,6 +25,7 @@ from nominatim.errors import UsageError
 try:
     from osmium.replication.server import ReplicationServer
     from osmium import WriteHandler
+    from osmium import version as pyo_version
 except ImportError as exc:
     logging.getLogger().critical("pyosmium not installed. Replication functions not available.\n"
                                  "To install pyosmium via pip: pip3 install osmium")
@@ -86,7 +90,8 @@ class UpdateState(Enum):
     NO_CHANGES = 3
 
 
-def update(conn: Connection, options: MutableMapping[str, Any]) -> UpdateState:
+def update(conn: Connection, options: MutableMapping[str, Any],
+           socket_timeout: int = 60) -> UpdateState:
     """ Update database from the next batch of data. Returns the state of
         updates according to `UpdateState`.
     """
@@ -114,7 +119,7 @@ def update(conn: Connection, options: MutableMapping[str, Any]) -> UpdateState:
         options['import_file'].unlink()
 
     # Read updates into file.
-    with _make_replication_server(options['base_url']) as repl:
+    with _make_replication_server(options['base_url'], socket_timeout) as repl:
         outhandler = WriteHandler(str(options['import_file']))
         endseq = repl.apply_diffs(outhandler, startseq + 1,
                                   max_size=options['max_diff_size'] * 1024)
@@ -136,14 +141,40 @@ def update(conn: Connection, options: MutableMapping[str, Any]) -> UpdateState:
     return UpdateState.UP_TO_DATE
 
 
-def _make_replication_server(url: str) -> ContextManager[ReplicationServer]:
+def _make_replication_server(url: str, timeout: int) -> ContextManager[ReplicationServer]:
     """ Returns a ReplicationServer in form of a context manager.
 
         Creates a light wrapper around older versions of pyosmium that did
         not support the context manager interface.
     """
     if hasattr(ReplicationServer, '__enter__'):
-        return cast(ContextManager[ReplicationServer], ReplicationServer(url))
+        # Patches the open_url function for pyosmium >= 3.2
+        # where the socket timeout is no longer respected.
+        def patched_open_url(self: ReplicationServer, url: urlrequest.Request) -> Any:
+            """ Download a resource from the given URL and return a byte sequence
+                of the content.
+            """
+            get_params = {
+                'headers': {"User-Agent" : f"Nominatim (pyosmium/{pyo_version.pyosmium_release})"},
+                'timeout': timeout or None,
+                'stream': True
+            }
+
+            if self.session is not None:
+                return self.session.get(url.get_full_url(), **get_params)
+
+            @contextmanager
+            def _get_url_with_session() -> Iterator[requests.Response]:
+                with requests.Session() as session:
+                    request = session.get(url.get_full_url(), **get_params) # type: ignore
+                    yield request
+
+            return _get_url_with_session()
+
+        repl = ReplicationServer(url)
+        repl.open_url = types.MethodType(patched_open_url, repl)
+
+        return cast(ContextManager[ReplicationServer], repl)
 
     @contextmanager
     def get_cm() -> Generator[ReplicationServer, None, None]: