Merge remote-tracking branch 'upstream/master'

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

diff --git a/nominatim/db/connection.py b/nominatim/db/connection.py
index 6bd81a2ff53d2025e164169a12ddd9bbaa88edab..c60bcfddb8af99faf3bc2ba4e7f7a48b7baf731f 100644 (file)
--- a/nominatim/db/connection.py
+++ b/nominatim/db/connection.py
@@ -1,28 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2022 by the Nominatim developer community.
+# For a full list of authors see the git log.

 """
 Specialised connection and cursor functions.
 """
 import contextlib
 import logging
 """
 Specialised connection and cursor functions.
 """
 import contextlib
 import logging

+import os

 
 import psycopg2
 import psycopg2.extensions
 import psycopg2.extras
 
 import psycopg2
 import psycopg2.extensions
 import psycopg2.extras

+from psycopg2 import sql as pysql

 
 

-from ..errors import UsageError
+from nominatim.errors import UsageError
+
+LOG = logging.getLogger()

 
 class _Cursor(psycopg2.extras.DictCursor):
     """ A cursor returning dict-like objects and providing specialised
         execution functions.
     """
 
 
 class _Cursor(psycopg2.extras.DictCursor):
     """ A cursor returning dict-like objects and providing specialised
         execution functions.
     """
 

-    def execute(self, query, args=None): # pylint: disable=W0221
+    # pylint: disable=arguments-renamed,arguments-differ
+    def execute(self, query, args=None):

         """ Query execution that logs the SQL query when debugging is enabled.
         """
         """ Query execution that logs the SQL query when debugging is enabled.
         """

-        logger = logging.getLogger()
-        logger.debug(self.mogrify(query, args).decode('utf-8'))
+        LOG.debug(self.mogrify(query, args).decode('utf-8'))

 
         super().execute(query, args)
 
 
         super().execute(query, args)
 

+
+    def execute_values(self, sql, argslist, template=None):
+        """ Wrapper for the psycopg2 convenience function to execute
+            SQL for a list of values.
+        """
+        LOG.debug("SQL execute_values(%s, %s)", sql, argslist)
+
+        psycopg2.extras.execute_values(self, sql, argslist, template=template)
+
+

     def scalar(self, sql, args=None):
         """ Execute query that returns a single value. The value is returned.
             If the query yields more than one row, a ValueError is raised.
     def scalar(self, sql, args=None):
         """ Execute query that returns a single value. The value is returned.
             If the query yields more than one row, a ValueError is raised.


@@ -35,6 +55,22 @@ class _Cursor(psycopg2.extras.DictCursor):
         return self.fetchone()[0]
 
 
         return self.fetchone()[0]
 
 

+    def drop_table(self, name, if_exists=True, cascade=False):
+        """ Drop the table with the given name.
+            Set `if_exists` to False if a non-existant table should raise
+            an exception instead of just being ignored. If 'cascade' is set
+            to True then all dependent tables are deleted as well.
+        """
+        sql = 'DROP TABLE '
+        if if_exists:
+            sql += 'IF EXISTS '
+        sql += '{}'
+        if cascade:
+            sql += ' CASCADE'
+
+        self.execute(pysql.SQL(sql).format(pysql.Identifier(name)))
+
+

 class _Connection(psycopg2.extensions.connection):
     """ A connection that provides the specialised cursor by default and
         adds convenience functions for administrating the database.
 class _Connection(psycopg2.extensions.connection):
     """ A connection that provides the specialised cursor by default and
         adds convenience functions for administrating the database.


@@ -55,6 +91,17 @@ class _Connection(psycopg2.extensions.connection):
             return num == 1
 
 
             return num == 1
 
 

+    def table_has_column(self, table, column):
+        """ Check if the table 'table' exists and has a column with name 'column'.
+        """
+        with self.cursor() as cur:
+            has_column = cur.scalar("""SELECT count(*) FROM information_schema.columns
+                                       WHERE table_name = %s
+                                             and column_name = %s""",
+                                    (table, column))
+            return has_column > 0
+
+

     def index_exists(self, index, table=None):
         """ Check that an index with the given name exists in the database.
             If table is not None then the index must relate to the given
     def index_exists(self, index, table=None):
         """ Check that an index with the given name exists in the database.
             If table is not None then the index must relate to the given


@@ -73,15 +120,37 @@ class _Connection(psycopg2.extensions.connection):
         return True
 
 
         return True
 
 

+    def drop_table(self, name, if_exists=True, cascade=False):
+        """ Drop the table with the given name.
+            Set `if_exists` to False if a non-existant table should raise
+            an exception instead of just being ignored.
+        """
+        with self.cursor() as cur:
+            cur.drop_table(name, if_exists, cascade)
+        self.commit()
+
+

     def server_version_tuple(self):
         """ Return the server version as a tuple of (major, minor).
             Converts correctly for pre-10 and post-10 PostgreSQL versions.
         """
         version = self.server_version
         if version < 100000:
     def server_version_tuple(self):
         """ Return the server version as a tuple of (major, minor).
             Converts correctly for pre-10 and post-10 PostgreSQL versions.
         """
         version = self.server_version
         if version < 100000:

-            return (version / 10000, (version % 10000) / 100)
+            return (int(version / 10000), (version % 10000) / 100)
+
+        return (int(version / 10000), version % 10000)
+
+
+    def postgis_version_tuple(self):
+        """ Return the postgis version installed in the database as a
+            tuple of (major, minor). Assumes that the PostGIS extension
+            has been installed already.
+        """
+        with self.cursor() as cur:
+            version = cur.scalar('SELECT postgis_lib_version()')
+
+        return tuple((int(x) for x in version.split('.')[:2]))

 
 

-        return (version / 10000, version % 10000)

 
 def connect(dsn):
     """ Open a connection to the database using the specialised connection
 
 def connect(dsn):
     """ Open a connection to the database using the specialised connection


@@ -95,4 +164,53 @@ def connect(dsn):
         ctxmgr.connection = conn
         return ctxmgr
     except psycopg2.OperationalError as err:
         ctxmgr.connection = conn
         return ctxmgr
     except psycopg2.OperationalError as err:

-        raise UsageError("Cannot connect to database: {}".format(err)) from err
+        raise UsageError(f"Cannot connect to database: {err}") from err
+
+
+# Translation from PG connection string parameters to PG environment variables.
+# Derived from https://www.postgresql.org/docs/current/libpq-envars.html.
+_PG_CONNECTION_STRINGS = {
+    'host': 'PGHOST',
+    'hostaddr': 'PGHOSTADDR',
+    'port': 'PGPORT',
+    'dbname': 'PGDATABASE',
+    'user': 'PGUSER',
+    'password': 'PGPASSWORD',
+    'passfile': 'PGPASSFILE',
+    'channel_binding': 'PGCHANNELBINDING',
+    'service': 'PGSERVICE',
+    'options': 'PGOPTIONS',
+    'application_name': 'PGAPPNAME',
+    'sslmode': 'PGSSLMODE',
+    'requiressl': 'PGREQUIRESSL',
+    'sslcompression': 'PGSSLCOMPRESSION',
+    'sslcert': 'PGSSLCERT',
+    'sslkey': 'PGSSLKEY',
+    'sslrootcert': 'PGSSLROOTCERT',
+    'sslcrl': 'PGSSLCRL',
+    'requirepeer': 'PGREQUIREPEER',
+    'ssl_min_protocol_version': 'PGSSLMINPROTOCOLVERSION',
+    'ssl_max_protocol_version': 'PGSSLMAXPROTOCOLVERSION',
+    'gssencmode': 'PGGSSENCMODE',
+    'krbsrvname': 'PGKRBSRVNAME',
+    'gsslib': 'PGGSSLIB',
+    'connect_timeout': 'PGCONNECT_TIMEOUT',
+    'target_session_attrs': 'PGTARGETSESSIONATTRS',
+}
+
+
+def get_pg_env(dsn, base_env=None):
+    """ Return a copy of `base_env` with the environment variables for
+        PostgresSQL set up from the given database connection string.
+        If `base_env` is None, then the OS environment is used as a base
+        environment.
+    """
+    env = dict(base_env if base_env is not None else os.environ)
+
+    for param, value in psycopg2.extensions.parse_dsn(dsn).items():
+        if param in _PG_CONNECTION_STRINGS:
+            env[_PG_CONNECTION_STRINGS[param]] = value
+        else:
+            LOG.error("Unknown connection parameter '%s' ignored.", param)
+
+    return env