1 # SPDX-License-Identifier: GPL-3.0-or-later
3 # This file is part of Nominatim. (https://nominatim.org)
5 # Copyright (C) 2026 by the Nominatim developer community.
6 # For a full list of authors see the git log.
8 Functions for setting up and importing a new Nominatim database.
10 from typing import Tuple, Optional, Union, Sequence, MutableMapping, Any
15 from pathlib import Path
19 from psycopg import sql as pysql
21 from ..errors import UsageError
22 from ..config import Configuration
23 from ..db.connection import connect, get_pg_env, Connection, server_version_tuple, \
24 postgis_version_tuple, drop_tables, table_exists, execute_scalar
25 from ..db.sql_preprocessor import SQLPreprocessor
26 from ..db.query_pool import QueryPool
27 from .exec_utils import run_osm2pgsql
28 from ..version import POSTGRESQL_REQUIRED_VERSION, POSTGIS_REQUIRED_VERSION
30 LOG = logging.getLogger()
33 def _require_version(module: str, actual: Tuple[int, int], expected: Tuple[int, int]) -> None:
34 """ Compares the version for the given module and raises an exception
35 if the actual version is too old.
38 LOG.fatal('Minimum supported version of %s is %d.%d. '
39 'Found version %d.%d.',
40 module, expected[0], expected[1], actual[0], actual[1])
41 raise UsageError(f'{module} is too old.')
44 def _require_loaded(extension_name: str, conn: Connection) -> None:
45 """ Check that the given extension is loaded. """
46 with conn.cursor() as cur:
47 cur.execute('SELECT * FROM pg_extension WHERE extname = %s', (extension_name, ))
49 LOG.fatal('Required module %s is not loaded.', extension_name)
50 raise UsageError(f'{extension_name} is not loaded.')
53 def check_existing_database_plugins(dsn: str) -> None:
54 """ Check that the database has the required plugins installed."""
55 with connect(dsn) as conn:
56 _require_version('PostgreSQL server',
57 server_version_tuple(conn),
58 POSTGRESQL_REQUIRED_VERSION)
59 _require_version('PostGIS',
60 postgis_version_tuple(conn),
61 POSTGIS_REQUIRED_VERSION)
62 _require_loaded('hstore', conn)
65 def setup_database_skeleton(dsn: str, rouser: Optional[str] = None) -> None:
66 """ Create a new database for Nominatim and populate it with the
69 The function fails when the database already exists or Postgresql or
70 PostGIS versions are too old.
72 Uses `createdb` to create the database.
74 If 'rouser' is given, then the function also checks that the user
75 with that given name exists.
77 Requires superuser rights by the caller.
79 proc = subprocess.run(['createdb'], env=get_pg_env(dsn), check=False)
81 if proc.returncode != 0:
82 raise UsageError('Creating new database failed.')
84 with connect(dsn) as conn:
85 _require_version('PostgreSQL server',
86 server_version_tuple(conn),
87 POSTGRESQL_REQUIRED_VERSION)
89 if rouser is not None:
90 cnt = execute_scalar(conn, 'SELECT count(*) FROM pg_user where usename = %s',
93 LOG.fatal("Web user '%s' does not exist. Create it with:\n"
94 "\n createuser %s", rouser, rouser)
95 raise UsageError('Missing read-only user.')
98 with conn.cursor() as cur:
99 cur.execute('CREATE EXTENSION IF NOT EXISTS hstore')
100 cur.execute('CREATE EXTENSION IF NOT EXISTS postgis')
101 cur.execute('CREATE EXTENSION IF NOT EXISTS postgis_raster')
105 _require_version('PostGIS',
106 postgis_version_tuple(conn),
107 POSTGIS_REQUIRED_VERSION)
110 def import_osm_data(osm_files: Union[Path, Sequence[Path]],
111 options: MutableMapping[str, Any],
112 drop: bool = False, ignore_errors: bool = False) -> None:
113 """ Import the given OSM files. 'options' contains the list of
114 default settings for osm2pgsql.
116 options['import_file'] = osm_files
117 options['append'] = False
118 options['threads'] = 1
120 if not options['flatnode_file'] and options['osm2pgsql_cache'] == 0:
121 # Make some educated guesses about cache size based on the size
122 # of the import file and the available memory.
123 mem = psutil.virtual_memory()
125 if isinstance(osm_files, list):
126 for fname in osm_files:
127 fsize += os.stat(str(fname)).st_size
129 fsize = os.stat(str(osm_files)).st_size
130 options['osm2pgsql_cache'] = int(min((mem.available + getattr(mem, 'cached', 0)) * 0.75,
131 fsize * 2) / 1024 / 1024) + 1
133 run_osm2pgsql(options)
135 with connect(options['dsn']) as conn:
136 if not ignore_errors:
137 with conn.cursor() as cur:
138 cur.execute('SELECT true FROM place LIMIT 1')
139 if cur.rowcount == 0:
140 raise UsageError('No data imported by osm2pgsql.')
143 drop_tables(conn, 'planet_osm_nodes')
146 if drop and options['flatnode_file']:
147 Path(options['flatnode_file']).unlink()
150 def create_tables(conn: Connection, config: Configuration, reverse_only: bool = False) -> None:
151 """ Create the set of basic tables.
152 When `reverse_only` is True, then the main table for searching will
153 be skipped and only reverse search is possible.
155 SQLPreprocessor(conn, config).run_sql_file(conn, 'tables.sql',
156 create_reverse_only=reverse_only)
158 # reinitiate the preprocessor to get all the newly created tables
159 SQLPreprocessor(conn, config).run_sql_file(conn, 'grants.sql')
162 def create_table_triggers(conn: Connection, config: Configuration) -> None:
163 """ Create the triggers for the tables. The trigger functions must already
164 have been imported with refresh.create_functions().
166 sql = SQLPreprocessor(conn, config)
167 sql.run_sql_file(conn, 'table-triggers.sql')
170 def create_partition_tables(conn: Connection, config: Configuration) -> None:
171 """ Create tables that have explicit partitioning.
173 sql = SQLPreprocessor(conn, config)
174 sql.run_sql_file(conn, 'partition-tables.src.sql')
177 def truncate_data_tables(conn: Connection) -> None:
178 """ Truncate all data tables to prepare for a fresh load.
180 with conn.cursor() as cur:
181 cur.execute('TRUNCATE placex')
182 cur.execute('TRUNCATE place_addressline')
183 cur.execute('TRUNCATE location_area')
184 cur.execute('TRUNCATE location_area_country')
185 cur.execute('TRUNCATE location_property_tiger')
186 cur.execute('TRUNCATE location_property_osmline')
187 cur.execute('TRUNCATE location_postcodes')
188 if table_exists(conn, 'search_name'):
189 cur.execute('TRUNCATE search_name')
190 cur.execute('DROP SEQUENCE IF EXISTS seq_place')
191 cur.execute('CREATE SEQUENCE seq_place start 100000')
193 cur.execute("""SELECT tablename FROM pg_tables
194 WHERE tablename LIKE 'location_road_%'""")
196 for table in [r[0] for r in list(cur)]:
197 cur.execute(pysql.SQL('TRUNCATE {}').format(pysql.Identifier(table)))
202 _COPY_COLUMNS = pysql.SQL(',').join(map(pysql.Identifier,
203 ('osm_type', 'osm_id', 'class', 'type',
204 'name', 'admin_level', 'address',
205 'extratags', 'geometry')))
208 async def load_data(dsn: str, threads: int) -> None:
209 """ Copy data into the word and placex table.
211 placex_threads = max(1, threads - 1)
213 progress = asyncio.create_task(_progress_print())
215 async with QueryPool(dsn, placex_threads + 1) as pool:
216 # Copy data from place to placex in <threads - 1> chunks.
217 for imod in range(placex_threads):
218 await pool.put_query(
219 pysql.SQL("""INSERT INTO placex ({columns})
220 SELECT {columns} FROM place
221 WHERE osm_id % {total} = {mod}
222 """).format(columns=_COPY_COLUMNS,
223 total=pysql.Literal(placex_threads),
224 mod=pysql.Literal(imod)), None)
226 # Interpolations need to be copied separately
227 await pool.put_query("""
228 INSERT INTO location_property_osmline (osm_id, type, address, linegeo)
229 SELECT osm_id, type, address, geometry
230 FROM place_interpolation
235 async with await psycopg.AsyncConnection.connect(dsn) as aconn:
236 await aconn.execute('ANALYSE')
239 async def _progress_print() -> None:
242 await asyncio.sleep(1)
243 except asyncio.CancelledError:
244 print('', flush=True)
246 print('.', end='', flush=True)
249 async def create_search_indices(conn: Connection, config: Configuration,
250 drop: bool = False, threads: int = 1) -> None:
251 """ Create tables that have explicit partitioning.
254 # If index creation failed and left an index invalid, they need to be
255 # cleaned out first, so that the script recreates them.
256 with conn.cursor() as cur:
257 cur.execute("""SELECT relname FROM pg_class, pg_index
258 WHERE pg_index.indisvalid = false
259 AND pg_index.indexrelid = pg_class.oid""")
260 bad_indices = [row[0] for row in list(cur)]
261 for idx in bad_indices:
262 LOG.info("Drop invalid index %s.", idx)
263 cur.execute(pysql.SQL('DROP INDEX {}').format(pysql.Identifier(idx)))
266 sql = SQLPreprocessor(conn, config)
268 await sql.run_parallel_sql_file(config.get_libpq_dsn(),
269 'indices.sql', min(8, threads), drop=drop)