try future annotations to resolve Generics compatibility

[nominatim.git] / nominatim / db / utils.py

diff --git a/nominatim/db/utils.py b/nominatim/db/utils.py
index b859afa8137e9254b4a4a88ce3d8236fb1383d8c..d9154ed90160b5b0a4c01e72fc6df5de4a9002cf 100644 (file)
--- a/nominatim/db/utils.py
+++ b/nominatim/db/utils.py
@@ -7,17 +7,21 @@
 """
 Helper functions for handling DB accesses.
 """
+from typing import IO, Optional, Union, Any, Iterable
 import subprocess
 import logging
 import gzip
 import io
+from pathlib import Path
 
-from nominatim.db.connection import get_pg_env
+from nominatim.db.connection import get_pg_env, Cursor
 from nominatim.errors import UsageError
 
 LOG = logging.getLogger()
 
-def _pipe_to_proc(proc, fdesc):
+def _pipe_to_proc(proc: 'subprocess.Popen[bytes]',
+                  fdesc: Union[IO[bytes], gzip.GzipFile]) -> int:
+    assert proc.stdin is not None
     chunk = fdesc.read(2048)
     while chunk and proc.poll() is None:
         try:
@@ -28,7 +32,10 @@ def _pipe_to_proc(proc, fdesc):
 
     return len(chunk)
 
-def execute_file(dsn, fname, ignore_errors=False, pre_code=None, post_code=None):
+def execute_file(dsn: str, fname: Path,
+                 ignore_errors: bool = False,
+                 pre_code: Optional[str] = None,
+                 post_code: Optional[str] = None) -> None:
     """ Read an SQL file and run its contents against the given database
         using psql. Use `pre_code` and `post_code` to run extra commands
         before or after executing the file. The commands are run within the
@@ -42,6 +49,7 @@ def execute_file(dsn, fname, ignore_errors=False, pre_code=None, post_code=None)
         cmd.append('--quiet')
 
     with subprocess.Popen(cmd, env=get_pg_env(dsn), stdin=subprocess.PIPE) as proc:
+        assert proc.stdin is not None
         try:
             if not LOG.isEnabledFor(logging.INFO):
                 proc.stdin.write('set client_min_messages to WARNING;'.encode('utf-8'))
@@ -76,20 +84,20 @@ class CopyBuffer:
     """ Data collector for the copy_from command.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self.buffer = io.StringIO()
 
 
-    def __enter__(self):
+    def __enter__(self) -> 'CopyBuffer':
         return self
 
 
-    def __exit__(self, exc_type, exc_value, traceback):
+    def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
         if self.buffer is not None:
             self.buffer.close()
 
 
-    def add(self, *data):
+    def add(self, *data: Any) -> None:
         """ Add another row of data to the copy buffer.
         """
         first = True
@@ -105,9 +113,9 @@ class CopyBuffer:
         self.buffer.write('\n')
 
 
-    def copy_out(self, cur, table, columns=None):
+    def copy_out(self, cur: Cursor, table: str, columns: Optional[Iterable[str]] = None) -> None:
         """ Copy all collected data into the given table.
         """
         if self.buffer.tell() > 0:
             self.buffer.seek(0)
-            cur.copy_from(self.buffer, table, columns=columns)
+            cur.copy_from(self.buffer, table, columns=columns) # type: ignore[arg-type]