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 database migration to newer software versions.
12 from psycopg2 import sql as pysql
14 from nominatim.db import properties
15 from nominatim.db.connection import connect
16 from nominatim.version import NOMINATIM_VERSION, version_str
17 from nominatim.tools import refresh
18 from nominatim.tokenizer import factory as tokenizer_factory
19 from nominatim.errors import UsageError
21 LOG = logging.getLogger()
23 _MIGRATION_FUNCTIONS = []
25 def migrate(config, paths):
26 """ Check for the current database version and execute migrations,
29 with connect(config.get_libpq_dsn()) as conn:
30 if conn.table_exists('nominatim_properties'):
31 db_version_str = properties.get_property(conn, 'database_version')
35 if db_version_str is not None:
36 parts = db_version_str.split('.')
37 db_version = tuple(int(x) for x in parts[:2] + parts[2].split('-'))
39 if db_version == NOMINATIM_VERSION:
40 LOG.warning("Database already at latest version (%s)", db_version_str)
43 LOG.info("Detected database version: %s", db_version_str)
45 db_version = _guess_version(conn)
48 has_run_migration = False
49 for version, func in _MIGRATION_FUNCTIONS:
50 if db_version <= version:
51 LOG.warning("Runnning: %s (%s)", func.__doc__.split('\n', 1)[0],
53 kwargs = dict(conn=conn, config=config, paths=paths)
56 has_run_migration = True
59 LOG.warning('Updating SQL functions.')
60 refresh.create_functions(conn, config)
61 tokenizer = tokenizer_factory.get_tokenizer_for_db(config)
62 tokenizer.update_sql_functions(config)
64 properties.set_property(conn, 'database_version', version_str())
71 def _guess_version(conn):
72 """ Guess a database version when there is no property table yet.
73 Only migrations for 3.6 and later are supported, so bail out
74 when the version seems older.
76 with conn.cursor() as cur:
77 # In version 3.6, the country_name table was updated. Check for that.
78 cnt = cur.scalar("""SELECT count(*) FROM
79 (SELECT svals(name) FROM country_name
80 WHERE country_code = 'gb')x;
83 LOG.fatal('It looks like your database was imported with a version '
84 'prior to 3.6.0. Automatic migration not possible.')
85 raise UsageError('Migration not possible.')
91 def _migration(major, minor, patch=0, dbpatch=0):
92 """ Decorator for a single migration step. The parameters describe the
93 version after which the migration is applicable, i.e before changing
94 from the given version to the next, the migration is required.
96 All migrations are run in the order in which they are defined in this
97 file. Do not run global SQL scripts for migrations as you cannot be sure
98 that these scripts do the same in later versions.
100 Functions will always be reimported in full at the end of the migration
101 process, so the migration functions may leave a temporary state behind
105 _MIGRATION_FUNCTIONS.append(((major, minor, patch, dbpatch), func))
111 @_migration(3, 5, 0, 99)
112 def import_status_timestamp_change(conn, **_):
113 """ Add timezone to timestamp in status table.
115 The import_status table has been changed to include timezone information
118 with conn.cursor() as cur:
119 cur.execute("""ALTER TABLE import_status ALTER COLUMN lastimportdate
120 TYPE timestamp with time zone;""")
123 @_migration(3, 5, 0, 99)
124 def add_nominatim_property_table(conn, config, **_):
125 """ Add nominatim_property table.
127 if not conn.table_exists('nominatim_properties'):
128 with conn.cursor() as cur:
129 cur.execute(pysql.SQL("""CREATE TABLE nominatim_properties (
132 GRANT SELECT ON TABLE nominatim_properties TO {};
134 .format(pysql.Identifier(config.DATABASE_WEBUSER)))
136 @_migration(3, 6, 0, 0)
137 def change_housenumber_transliteration(conn, **_):
138 """ Transliterate housenumbers.
140 The database schema switched from saving raw housenumbers in
141 placex.housenumber to saving transliterated ones.
143 Note: the function create_housenumber_id() has been dropped in later
146 with conn.cursor() as cur:
147 cur.execute("""CREATE OR REPLACE FUNCTION create_housenumber_id(housenumber TEXT)
152 SELECT array_to_string(array_agg(trans), ';')
154 FROM (SELECT lookup_word as trans,
155 getorcreate_housenumber_id(lookup_word)
156 FROM (SELECT make_standard_name(h) as lookup_word
157 FROM regexp_split_to_table(housenumber, '[,;]') h) x) y;
160 $$ LANGUAGE plpgsql STABLE STRICT;""")
161 cur.execute("DELETE FROM word WHERE class = 'place' and type = 'house'")
162 cur.execute("""UPDATE placex
163 SET housenumber = create_housenumber_id(housenumber)
164 WHERE housenumber is not null""")
167 @_migration(3, 7, 0, 0)
168 def switch_placenode_geometry_index(conn, **_):
169 """ Replace idx_placex_geometry_reverse_placeNode index.
171 Make the index slightly more permissive, so that it can also be used
172 when matching up boundaries and place nodes. It makes the index
173 idx_placex_adminname index unnecessary.
175 with conn.cursor() as cur:
176 cur.execute(""" CREATE INDEX IF NOT EXISTS idx_placex_geometry_placenode ON placex
177 USING GIST (geometry)
178 WHERE osm_type = 'N' and rank_search < 26
179 and class = 'place' and type != 'postcode'
180 and linked_place_id is null""")
181 cur.execute(""" DROP INDEX IF EXISTS idx_placex_adminname """)
184 @_migration(3, 7, 0, 1)
185 def install_legacy_tokenizer(conn, config, **_):
186 """ Setup legacy tokenizer.
188 If no other tokenizer has been configured yet, then create the
189 configuration for the backwards-compatible legacy tokenizer
191 if properties.get_property(conn, 'tokenizer') is None:
192 with conn.cursor() as cur:
193 for table in ('placex', 'location_property_osmline'):
194 has_column = cur.scalar("""SELECT count(*) FROM information_schema.columns
195 WHERE table_name = %s
196 and column_name = 'token_info'""",
199 cur.execute(pysql.SQL('ALTER TABLE {} ADD COLUMN token_info JSONB')
200 .format(pysql.Identifier(table)))
201 tokenizer = tokenizer_factory.create_tokenizer(config, init_db=False,
202 module_name='legacy')
204 tokenizer.migrate_database(config)
207 @_migration(4, 0, 99, 0)
208 def create_tiger_housenumber_index(conn, **_):
209 """ Create idx_location_property_tiger_parent_place_id with included
212 The inclusion is needed for efficient lookup of housenumbers in
213 full address searches.
215 if conn.server_version_tuple() >= (11, 0, 0):
216 with conn.cursor() as cur:
217 cur.execute(""" CREATE INDEX IF NOT EXISTS
218 idx_location_property_tiger_housenumber_migrated
219 ON location_property_tiger
220 USING btree(parent_place_id)
221 INCLUDE (startnumber, endnumber) """)
224 @_migration(4, 0, 99, 1)
225 def create_interpolation_index_on_place(conn, **_):
226 """ Create idx_place_interpolations for lookup of interpolation lines
229 with conn.cursor() as cur:
230 cur.execute("""CREATE INDEX IF NOT EXISTS idx_place_interpolations
231 ON place USING gist(geometry)
232 WHERE osm_type = 'W' and address ? 'interpolation'""")
235 @_migration(4, 0, 99, 2)
236 def add_step_column_for_interpolation(conn, **_):
237 """ Add a new column 'step' to the interpolations table.
239 Also convers the data into the stricter format which requires that
240 startnumbers comply with the odd/even requirements.
242 if conn.table_has_column('location_property_osmline', 'step'):
245 with conn.cursor() as cur:
246 # Mark invalid all interpolations with no intermediate numbers.
247 cur.execute("""UPDATE location_property_osmline SET startnumber = null
248 WHERE endnumber - startnumber <= 1 """)
249 # Align the start numbers where odd/even does not match.
250 cur.execute("""UPDATE location_property_osmline
251 SET startnumber = startnumber + 1,
252 linegeo = ST_LineSubString(linegeo,
253 1.0 / (endnumber - startnumber)::float,
255 WHERE (interpolationtype = 'odd' and startnumber % 2 = 0)
256 or (interpolationtype = 'even' and startnumber % 2 = 1)
258 # Mark invalid odd/even interpolations with no intermediate numbers.
259 cur.execute("""UPDATE location_property_osmline SET startnumber = null
260 WHERE interpolationtype in ('odd', 'even')
261 and endnumber - startnumber = 2""")
262 # Finally add the new column and populate it.
263 cur.execute("ALTER TABLE location_property_osmline ADD COLUMN step SMALLINT")
264 cur.execute("""UPDATE location_property_osmline
265 SET step = CASE WHEN interpolationtype = 'all'
270 @_migration(4, 0, 99, 3)
271 def add_step_column_for_tiger(conn, **_):
272 """ Add a new column 'step' to the tiger data table.
274 if conn.table_has_column('location_property_tiger', 'step'):
277 with conn.cursor() as cur:
278 cur.execute("ALTER TABLE location_property_tiger ADD COLUMN step SMALLINT")
279 cur.execute("""UPDATE location_property_tiger
280 SET step = CASE WHEN interpolationtype = 'all'
285 @_migration(4, 0, 99, 4)
286 def add_derived_name_column_for_country_names(conn, **_):
287 """ Add a new column 'derived_name' which in the future takes the
288 country names as imported from OSM data.
290 if not conn.table_has_column('country_name', 'derived_name'):
291 with conn.cursor() as cur:
292 cur.execute("ALTER TABLE country_name ADD COLUMN derived_name public.HSTORE")
295 @_migration(4, 0, 99, 5)
296 def mark_internal_country_names(conn, config, **_):
297 """ Names from the country table should be marked as internal to prevent
298 them from being deleted. Only necessary for ICU tokenizer.
300 import psycopg2.extras # pylint: disable=import-outside-toplevel
302 tokenizer = tokenizer_factory.get_tokenizer_for_db(config)
303 with tokenizer.name_analyzer() as analyzer:
304 with conn.cursor() as cur:
305 psycopg2.extras.register_hstore(cur)
306 cur.execute("SELECT country_code, name FROM country_name")
308 for country_code, names in cur:
311 names['countrycode'] = country_code
312 analyzer.add_country_names(country_code, names)