2 Functions for database migration to newer software versions.
6 from nominatim.db import properties
7 from nominatim.db.connection import connect
8 from nominatim.version import NOMINATIM_VERSION
9 from nominatim.tools import refresh
10 from nominatim.tokenizer import factory as tokenizer_factory
11 from nominatim.errors import UsageError
13 LOG = logging.getLogger()
15 _MIGRATION_FUNCTIONS = []
17 def migrate(config, paths):
18 """ Check for the current database version and execute migrations,
21 with connect(config.get_libpq_dsn()) as conn:
22 if conn.table_exists('nominatim_properties'):
23 db_version_str = properties.get_property(conn, 'database_version')
27 if db_version_str is not None:
28 parts = db_version_str.split('.')
29 db_version = tuple(int(x) for x in parts[:2] + parts[2].split('-'))
31 if db_version == NOMINATIM_VERSION:
32 LOG.warning("Database already at latest version (%s)", db_version_str)
35 LOG.info("Detected database version: %s", db_version_str)
37 db_version = _guess_version(conn)
40 has_run_migration = False
41 for version, func in _MIGRATION_FUNCTIONS:
42 if db_version <= version:
43 LOG.warning("Runnning: %s (%s)", func.__doc__.split('\n', 1)[0],
44 '{0[0]}.{0[1]}.{0[2]}-{0[3]}'.format(version))
45 kwargs = dict(conn=conn, config=config, paths=paths)
48 has_run_migration = True
51 LOG.warning('Updating SQL functions.')
52 refresh.create_functions(conn, config)
53 tokenizer = tokenizer_factory.get_tokenizer_for_db(config)
54 tokenizer.update_sql_functions(config)
56 properties.set_property(conn, 'database_version',
57 '{0[0]}.{0[1]}.{0[2]}-{0[3]}'.format(NOMINATIM_VERSION))
64 def _guess_version(conn):
65 """ Guess a database version when there is no property table yet.
66 Only migrations for 3.6 and later are supported, so bail out
67 when the version seems older.
69 with conn.cursor() as cur:
70 # In version 3.6, the country_name table was updated. Check for that.
71 cnt = cur.scalar("""SELECT count(*) FROM
72 (SELECT svals(name) FROM country_name
73 WHERE country_code = 'gb')x;
76 LOG.fatal('It looks like your database was imported with a version '
77 'prior to 3.6.0. Automatic migration not possible.')
78 raise UsageError('Migration not possible.')
84 def _migration(major, minor, patch=0, dbpatch=0):
85 """ Decorator for a single migration step. The parameters describe the
86 version after which the migration is applicable, i.e before changing
87 from the given version to the next, the migration is required.
89 All migrations are run in the order in which they are defined in this
90 file. Do not run global SQL scripts for migrations as you cannot be sure
91 that these scripts do the same in later versions.
93 Functions will always be reimported in full at the end of the migration
94 process, so the migration functions may leave a temporary state behind
98 _MIGRATION_FUNCTIONS.append(((major, minor, patch, dbpatch), func))
104 @_migration(3, 5, 0, 99)
105 def import_status_timestamp_change(conn, **_):
106 """ Add timezone to timestamp in status table.
108 The import_status table has been changed to include timezone information
111 with conn.cursor() as cur:
112 cur.execute("""ALTER TABLE import_status ALTER COLUMN lastimportdate
113 TYPE timestamp with time zone;""")
116 @_migration(3, 5, 0, 99)
117 def add_nominatim_property_table(conn, config, **_):
118 """ Add nominatim_property table.
120 if not conn.table_exists('nominatim_properties'):
121 with conn.cursor() as cur:
122 cur.execute("""CREATE TABLE nominatim_properties (
125 GRANT SELECT ON TABLE nominatim_properties TO "{}";
126 """.format(config.DATABASE_WEBUSER))
128 @_migration(3, 6, 0, 0)
129 def change_housenumber_transliteration(conn, **_):
130 """ Transliterate housenumbers.
132 The database schema switched from saving raw housenumbers in
133 placex.housenumber to saving transliterated ones.
135 Note: the function create_housenumber_id() has been dropped in later
138 with conn.cursor() as cur:
139 cur.execute("""CREATE OR REPLACE FUNCTION create_housenumber_id(housenumber TEXT)
144 SELECT array_to_string(array_agg(trans), ';')
146 FROM (SELECT lookup_word as trans,
147 getorcreate_housenumber_id(lookup_word)
148 FROM (SELECT make_standard_name(h) as lookup_word
149 FROM regexp_split_to_table(housenumber, '[,;]') h) x) y;
152 $$ LANGUAGE plpgsql STABLE STRICT;""")
153 cur.execute("DELETE FROM word WHERE class = 'place' and type = 'house'")
154 cur.execute("""UPDATE placex
155 SET housenumber = create_housenumber_id(housenumber)
156 WHERE housenumber is not null""")
159 @_migration(3, 7, 0, 0)
160 def switch_placenode_geometry_index(conn, **_):
161 """ Replace idx_placex_geometry_reverse_placeNode index.
163 Make the index slightly more permissive, so that it can also be used
164 when matching up boundaries and place nodes. It makes the index
165 idx_placex_adminname index unnecessary.
167 with conn.cursor() as cur:
168 cur.execute(""" CREATE INDEX IF NOT EXISTS idx_placex_geometry_placenode ON placex
169 USING GIST (geometry)
170 WHERE osm_type = 'N' and rank_search < 26
171 and class = 'place' and type != 'postcode'
172 and linked_place_id is null""")
173 cur.execute(""" DROP INDEX IF EXISTS idx_placex_adminname """)
176 @_migration(3, 7, 0, 1)
177 def install_legacy_tokenizer(conn, config, **_):
178 """ Setup legacy tokenizer.
180 If no other tokenizer has been configured yet, then create the
181 configuration for the backwards-compatible legacy tokenizer
183 if properties.get_property(conn, 'tokenizer') is None:
184 with conn.cursor() as cur:
185 for table in ('placex', 'location_property_osmline'):
186 has_column = cur.scalar("""SELECT count(*) FROM information_schema.columns
187 WHERE table_name = %s
188 and column_name = 'token_info'""",
191 cur.execute('ALTER TABLE {} ADD COLUMN token_info JSONB'.format(table))
192 tokenizer = tokenizer_factory.create_tokenizer(config, init_db=False,
193 module_name='legacy')
195 tokenizer.migrate_database(config)
198 @_migration(4, 0, 99, 0)
199 def create_tiger_housenumber_index(conn, **_):
200 """ Create idx_location_property_tiger_parent_place_id with included
203 The inclusion is needed for efficient lookup of housenumbers in
204 full address searches.
206 if conn.server_version_tuple() >= (11, 0, 0):
207 with conn.cursor() as cur:
208 cur.execute(""" CREATE INDEX IF NOT EXISTS
209 idx_location_property_tiger_housenumber_migrated
210 ON location_property_tiger
211 USING btree(parent_place_id)
212 INCLUDE (startnumber, endnumber) """)