1 # SPDX-License-Identifier: GPL-2.0-only
3 # This file is part of Nominatim. (https://nominatim.org)
5 # Copyright (C) 2022 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
18 from psycopg2 import sql as pysql
20 from nominatim.config import Configuration
21 from nominatim.db.connection import connect, get_pg_env, Connection
22 from nominatim.db.async_connection import DBConnection
23 from nominatim.db.sql_preprocessor import SQLPreprocessor
24 from nominatim.tools.exec_utils import run_osm2pgsql
25 from nominatim.errors import UsageError
26 from nominatim.version import POSTGRESQL_REQUIRED_VERSION, POSTGIS_REQUIRED_VERSION
28 LOG = logging.getLogger()
30 def _require_version(module: str, actual: Tuple[int, int], expected: Tuple[int, int]) -> None:
31 """ Compares the version for the given module and raises an exception
32 if the actual version is too old.
35 LOG.fatal('Minimum supported version of %s is %d.%d. '
36 'Found version %d.%d.',
37 module, expected[0], expected[1], actual[0], actual[1])
38 raise UsageError(f'{module} is too old.')
41 def setup_database_skeleton(dsn: str, rouser: Optional[str] = None) -> None:
42 """ Create a new database for Nominatim and populate it with the
45 The function fails when the database already exists or Postgresql or
46 PostGIS versions are too old.
48 Uses `createdb` to create the database.
50 If 'rouser' is given, then the function also checks that the user
51 with that given name exists.
53 Requires superuser rights by the caller.
55 proc = subprocess.run(['createdb'], env=get_pg_env(dsn), check=False)
57 if proc.returncode != 0:
58 raise UsageError('Creating new database failed.')
60 with connect(dsn) as conn:
61 _require_version('PostgreSQL server',
62 conn.server_version_tuple(),
63 POSTGRESQL_REQUIRED_VERSION)
65 if rouser is not None:
66 with conn.cursor() as cur:
67 cnt = cur.scalar('SELECT count(*) FROM pg_user where usename = %s',
70 LOG.fatal("Web user '%s' does not exist. Create it with:\n"
71 "\n createuser %s", rouser, rouser)
72 raise UsageError('Missing read-only user.')
75 with conn.cursor() as cur:
76 cur.execute('CREATE EXTENSION IF NOT EXISTS hstore')
77 cur.execute('CREATE EXTENSION IF NOT EXISTS postgis')
80 _require_version('PostGIS',
81 conn.postgis_version_tuple(),
82 POSTGIS_REQUIRED_VERSION)
85 def import_osm_data(osm_files: Union[Path, Sequence[Path]],
86 options: MutableMapping[str, Any],
87 drop: bool = False, ignore_errors: bool = False) -> None:
88 """ Import the given OSM files. 'options' contains the list of
89 default settings for osm2pgsql.
91 options['import_file'] = osm_files
92 options['append'] = False
93 options['threads'] = 1
95 if not options['flatnode_file'] and options['osm2pgsql_cache'] == 0:
96 # Make some educated guesses about cache size based on the size
97 # of the import file and the available memory.
98 mem = psutil.virtual_memory()
100 if isinstance(osm_files, list):
101 for fname in osm_files:
102 fsize += os.stat(str(fname)).st_size
104 fsize = os.stat(str(osm_files)).st_size
105 options['osm2pgsql_cache'] = int(min((mem.available + mem.cached) * 0.75,
106 fsize * 2) / 1024 / 1024) + 1
108 run_osm2pgsql(options)
110 with connect(options['dsn']) as conn:
111 if not ignore_errors:
112 with conn.cursor() as cur:
113 cur.execute('SELECT * FROM place LIMIT 1')
114 if cur.rowcount == 0:
115 raise UsageError('No data imported by osm2pgsql.')
118 conn.drop_table('planet_osm_nodes')
120 if drop and options['flatnode_file']:
121 Path(options['flatnode_file']).unlink()
124 def create_tables(conn: Connection, config: Configuration, reverse_only: bool = False) -> None:
125 """ Create the set of basic tables.
126 When `reverse_only` is True, then the main table for searching will
127 be skipped and only reverse search is possible.
129 sql = SQLPreprocessor(conn, config)
130 sql.env.globals['db']['reverse_only'] = reverse_only
132 sql.run_sql_file(conn, 'tables.sql')
135 def create_table_triggers(conn: Connection, config: Configuration) -> None:
136 """ Create the triggers for the tables. The trigger functions must already
137 have been imported with refresh.create_functions().
139 sql = SQLPreprocessor(conn, config)
140 sql.run_sql_file(conn, 'table-triggers.sql')
143 def create_partition_tables(conn: Connection, config: Configuration) -> None:
144 """ Create tables that have explicit partitioning.
146 sql = SQLPreprocessor(conn, config)
147 sql.run_sql_file(conn, 'partition-tables.src.sql')
150 def truncate_data_tables(conn: Connection) -> None:
151 """ Truncate all data tables to prepare for a fresh load.
153 with conn.cursor() as cur:
154 cur.execute('TRUNCATE placex')
155 cur.execute('TRUNCATE place_addressline')
156 cur.execute('TRUNCATE location_area')
157 cur.execute('TRUNCATE location_area_country')
158 cur.execute('TRUNCATE location_property_tiger')
159 cur.execute('TRUNCATE location_property_osmline')
160 cur.execute('TRUNCATE location_postcode')
161 if conn.table_exists('search_name'):
162 cur.execute('TRUNCATE search_name')
163 cur.execute('DROP SEQUENCE IF EXISTS seq_place')
164 cur.execute('CREATE SEQUENCE seq_place start 100000')
166 cur.execute("""SELECT tablename FROM pg_tables
167 WHERE tablename LIKE 'location_road_%'""")
169 for table in [r[0] for r in list(cur)]:
170 cur.execute('TRUNCATE ' + table)
175 _COPY_COLUMNS = pysql.SQL(',').join(map(pysql.Identifier,
176 ('osm_type', 'osm_id', 'class', 'type',
177 'name', 'admin_level', 'address',
178 'extratags', 'geometry')))
181 def load_data(dsn: str, threads: int) -> None:
182 """ Copy data into the word and placex table.
184 sel = selectors.DefaultSelector()
185 # Then copy data from place to placex in <threads - 1> chunks.
186 place_threads = max(1, threads - 1)
187 for imod in range(place_threads):
188 conn = DBConnection(dsn)
191 pysql.SQL("""INSERT INTO placex ({columns})
192 SELECT {columns} FROM place
193 WHERE osm_id % {total} = {mod}
194 AND NOT (class='place' and (type='houses' or type='postcode'))
195 AND ST_IsValid(geometry)
196 """).format(columns=_COPY_COLUMNS,
197 total=pysql.Literal(place_threads),
198 mod=pysql.Literal(imod)))
199 sel.register(conn, selectors.EVENT_READ, conn)
201 # Address interpolations go into another table.
202 conn = DBConnection(dsn)
204 conn.perform("""INSERT INTO location_property_osmline (osm_id, address, linegeo)
205 SELECT osm_id, address, geometry FROM place
206 WHERE class='place' and type='houses' and osm_type='W'
207 and ST_GeometryType(geometry) = 'ST_LineString'
209 sel.register(conn, selectors.EVENT_READ, conn)
211 # Now wait for all of them to finish.
212 todo = place_threads + 1
214 for key, _ in sel.select(1):
220 print('.', end='', flush=True)
223 with connect(dsn) as syn_conn:
224 with syn_conn.cursor() as cur:
225 cur.execute('ANALYSE')
228 def create_search_indices(conn: Connection, config: Configuration, drop: bool = False) -> None:
229 """ Create tables that have explicit partitioning.
232 # If index creation failed and left an index invalid, they need to be
233 # cleaned out first, so that the script recreates them.
234 with conn.cursor() as cur:
235 cur.execute("""SELECT relname FROM pg_class, pg_index
236 WHERE pg_index.indisvalid = false
237 AND pg_index.indexrelid = pg_class.oid""")
238 bad_indices = [row[0] for row in list(cur)]
239 for idx in bad_indices:
240 LOG.info("Drop invalid index %s.", idx)
241 cur.execute(pysql.SQL('DROP INDEX {}').format(pysql.Identifier(idx)))
244 sql = SQLPreprocessor(conn, config)
246 sql.run_sql_file(conn, 'indices.sql', drop=drop)