2 Functions for setting up and importing a new Nominatim database.
9 from pathlib import Path
13 from ..db.connection import connect, get_pg_env
14 from ..db import utils as db_utils
15 from ..db.async_connection import DBConnection
16 from .exec_utils import run_osm2pgsql
17 from ..errors import UsageError
18 from ..version import POSTGRESQL_REQUIRED_VERSION, POSTGIS_REQUIRED_VERSION
20 LOG = logging.getLogger()
22 def create_db(dsn, rouser=None):
23 """ Create a new database for the given DSN. Fails when the database
24 already exists or the PostgreSQL version is too old.
25 Uses `createdb` to create the database.
27 If 'rouser' is given, then the function also checks that the user
28 with that given name exists.
30 Requires superuser rights by the caller.
32 proc = subprocess.run(['createdb'], env=get_pg_env(dsn), check=False)
34 if proc.returncode != 0:
35 raise UsageError('Creating new database failed.')
37 with connect(dsn) as conn:
38 postgres_version = conn.server_version_tuple()
39 if postgres_version < POSTGRESQL_REQUIRED_VERSION:
40 LOG.fatal('Minimum supported version of Postgresql is %d.%d. '
41 'Found version %d.%d.',
42 POSTGRESQL_REQUIRED_VERSION[0], POSTGRESQL_REQUIRED_VERSION[1],
43 postgres_version[0], postgres_version[1])
44 raise UsageError('PostgreSQL server is too old.')
46 if rouser is not None:
47 with conn.cursor() as cur:
48 cnt = cur.scalar('SELECT count(*) FROM pg_user where usename = %s',
51 LOG.fatal("Web user '%s' does not exists. Create it with:\n"
52 "\n createuser %s", rouser, rouser)
53 raise UsageError('Missing read-only user.')
57 def setup_extensions(conn):
58 """ Set up all extensions needed for Nominatim. Also checks that the
59 versions of the extensions are sufficient.
61 with conn.cursor() as cur:
62 cur.execute('CREATE EXTENSION IF NOT EXISTS hstore')
63 cur.execute('CREATE EXTENSION IF NOT EXISTS postgis')
66 postgis_version = conn.postgis_version_tuple()
67 if postgis_version < POSTGIS_REQUIRED_VERSION:
68 LOG.fatal('Minimum supported version of PostGIS is %d.%d. '
69 'Found version %d.%d.',
70 POSTGIS_REQUIRED_VERSION[0], POSTGIS_REQUIRED_VERSION[1],
71 postgis_version[0], postgis_version[1])
72 raise UsageError('PostGIS version is too old.')
75 def install_module(src_dir, project_dir, module_dir):
76 """ Copy the normalization module from src_dir into the project
77 directory under the '/module' directory. If 'module_dir' is set, then
78 use the module from there instead and check that it is accessible
81 The function detects when the installation is run from the
82 build directory. It doesn't touch the module in that case.
85 module_dir = project_dir / 'module'
87 if not module_dir.exists() or not src_dir.samefile(module_dir):
89 if not module_dir.exists():
92 destfile = module_dir / 'nominatim.so'
93 shutil.copy(str(src_dir / 'nominatim.so'), str(destfile))
96 LOG.info('Database module installed at %s', str(destfile))
98 LOG.info('Running from build directory. Leaving database module as is.')
100 LOG.info("Using custom path for database module at '%s'", module_dir)
105 def check_module_dir_path(conn, path):
106 """ Check that the normalisation module can be found and executed
109 with conn.cursor() as cur:
110 cur.execute("""CREATE FUNCTION nominatim_test_import_func(text)
111 RETURNS text AS '{}/nominatim.so', 'transliteration'
112 LANGUAGE c IMMUTABLE STRICT;
113 DROP FUNCTION nominatim_test_import_func(text)
117 def import_base_data(dsn, sql_dir, ignore_partitions=False):
118 """ Create and populate the tables with basic static data that provides
119 the background for geocoding. Data is assumed to not yet exist.
121 db_utils.execute_file(dsn, sql_dir / 'country_name.sql')
122 db_utils.execute_file(dsn, sql_dir / 'country_osm_grid.sql.gz')
124 if ignore_partitions:
125 with connect(dsn) as conn:
126 with conn.cursor() as cur:
127 cur.execute('UPDATE country_name SET partition = 0')
131 def import_osm_data(osm_file, options, drop=False):
132 """ Import the given OSM file. 'options' contains the list of
133 default settings for osm2pgsql.
135 options['import_file'] = osm_file
136 options['append'] = False
137 options['threads'] = 1
139 if not options['flatnode_file'] and options['osm2pgsql_cache'] == 0:
140 # Make some educated guesses about cache size based on the size
141 # of the import file and the available memory.
142 mem = psutil.virtual_memory()
143 fsize = os.stat(str(osm_file)).st_size
144 options['osm2pgsql_cache'] = int(min((mem.available + mem.cached) * 0.75,
145 fsize * 2) / 1024 / 1024) + 1
147 run_osm2pgsql(options)
149 with connect(options['dsn']) as conn:
150 with conn.cursor() as cur:
151 cur.execute('SELECT * FROM place LIMIT 1')
152 if cur.rowcount == 0:
153 raise UsageError('No data imported by osm2pgsql.')
156 conn.drop_table('planet_osm_nodes')
159 if options['flatnode_file']:
160 Path(options['flatnode_file']).unlink()
163 def truncate_data_tables(conn, max_word_frequency=None):
164 """ Truncate all data tables to prepare for a fresh load.
166 with conn.cursor() as cur:
167 cur.execute('TRUNCATE word')
168 cur.execute('TRUNCATE placex')
169 cur.execute('TRUNCATE place_addressline')
170 cur.execute('TRUNCATE location_area')
171 cur.execute('TRUNCATE location_area_country')
172 cur.execute('TRUNCATE location_property')
173 cur.execute('TRUNCATE location_property_tiger')
174 cur.execute('TRUNCATE location_property_osmline')
175 cur.execute('TRUNCATE location_postcode')
176 cur.execute('TRUNCATE search_name')
177 cur.execute('DROP SEQUENCE seq_place')
178 cur.execute('CREATE SEQUENCE seq_place start 100000')
180 cur.execute("""SELECT tablename FROM pg_tables
181 WHERE tablename LIKE 'location_road_%'""")
183 for table in [r[0] for r in list(cur)]:
184 cur.execute('TRUNCATE ' + table)
186 if max_word_frequency is not None:
187 # Used by getorcreate_word_id to ignore frequent partial words.
188 cur.execute("""CREATE OR REPLACE FUNCTION get_maxwordfreq()
189 RETURNS integer AS $$
190 SELECT {} as maxwordfreq;
191 $$ LANGUAGE SQL IMMUTABLE
192 """.format(max_word_frequency))
195 _COPY_COLUMNS = 'osm_type, osm_id, class, type, name, admin_level, address, extratags, geometry'
197 def load_data(dsn, data_dir, threads):
198 """ Copy data into the word and placex table.
200 # Pre-calculate the most important terms in the word list.
201 db_utils.execute_file(dsn, data_dir / 'words.sql')
203 sel = selectors.DefaultSelector()
204 # Then copy data from place to placex in <threads - 1> chunks.
205 place_threads = max(1, threads - 1)
206 for imod in range(place_threads):
207 conn = DBConnection(dsn)
209 conn.perform("""INSERT INTO placex ({0})
210 SELECT {0} FROM place
211 WHERE osm_id % {1} = {2}
212 AND NOT (class='place' and type='houses')
213 AND ST_IsValid(geometry)
214 """.format(_COPY_COLUMNS, place_threads, imod))
215 sel.register(conn, selectors.EVENT_READ, conn)
217 # Address interpolations go into another table.
218 conn = DBConnection(dsn)
220 conn.perform("""INSERT INTO location_property_osmline (osm_id, address, linegeo)
221 SELECT osm_id, address, geometry FROM place
222 WHERE class='place' and type='houses' and osm_type='W'
223 and ST_GeometryType(geometry) = 'ST_LineString'
225 sel.register(conn, selectors.EVENT_READ, conn)
227 # Now wait for all of them to finish.
228 todo = place_threads + 1
230 for key, _ in sel.select(1):
236 print('.', end='', flush=True)
239 with connect(dsn) as conn:
240 with conn.cursor() as cur:
241 cur.execute('ANALYSE')