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1 # SPDX-License-Identifier: GPL-2.0-only
2 #
3 # This file is part of Nominatim. (https://nominatim.org)
4 #
5 # Copyright (C) 2022 by the Nominatim developer community.
6 # For a full list of authors see the git log.
7 """
8 Functions for importing and managing static country information.
9 """
10 import psycopg2.extras
11
12 from nominatim.db import utils as db_utils
13 from nominatim.db.connection import connect
14
15
16 class _CountryInfo:
17     """ Caches country-specific properties from the configuration file.
18     """
19
20     def __init__(self):
21         self._info = {}
22         self._key_prefix = 'name'
23
24     def load(self, config):
25         """ Load the country properties from the configuration files,
26             if they are not loaded yet.
27         """
28         if not self._info:
29             self._info = config.load_sub_configuration('country_settings.yaml')
30             # Convert languages into a list for simpler handling.
31             for prop in self._info.values():
32                 if 'languages' not in prop:
33                     prop['languages'] = []
34                 elif not isinstance(prop['languages'], list):
35                     prop['languages'] = [x.strip()
36                                          for x in prop['languages'].split(',')]
37                 if 'names' not in prop or prop['names'] is None:
38                     prop['names'] = {self._key_prefix: {}}
39
40     def items(self):
41         """ Return tuples of (country_code, property dict) as iterable.
42         """
43         return self._info.items()
44
45     def key_prefix(self):
46         """ Return the prefix that will be attached to the keys of the country
47             names values when storing them in the database
48         """
49         return self._key_prefix
50
51
52 _COUNTRY_INFO = _CountryInfo()
53
54
55 def setup_country_config(config):
56     """ Load country properties from the configuration file.
57         Needs to be called before using any other functions in this
58         file.
59     """
60     _COUNTRY_INFO.load(config)
61
62
63 def iterate():
64     """ Iterate over country code and properties.
65     """
66     return _COUNTRY_INFO.items()
67
68
69 def setup_country_tables(dsn, sql_dir, ignore_partitions=False):
70     """ Create and populate the tables with basic static data that provides
71         the background for geocoding. Data is assumed to not yet exist.
72     """
73     db_utils.execute_file(dsn, sql_dir / 'country_osm_grid.sql.gz')
74
75     def add_prefix_to_keys(names, prefix):
76         return {prefix+':'+k: v for k, v in names.items()}
77
78     params = []
79     for ccode, props in _COUNTRY_INFO.items():
80         if ccode is not None and props is not None:
81             if ignore_partitions:
82                 partition = 0
83             else:
84                 partition = props.get('partition')
85             lang = props['languages'][0] if len(
86                 props['languages']) == 1 else None
87             name = add_prefix_to_keys(props.get('names').get(
88                 _COUNTRY_INFO.key_prefix()), _COUNTRY_INFO.key_prefix())
89             params.append((ccode, name, lang, partition))
90     with connect(dsn) as conn:
91         with conn.cursor() as cur:
92             psycopg2.extras.register_hstore(cur)
93             cur.execute(
94                 """ CREATE TABLE public.country_name (
95                         country_code character varying(2),
96                         name public.hstore,
97                         derived_name public.hstore,
98                         country_default_language_code text,
99                         partition integer
100                     ); """)
101             cur.execute_values(
102                 """ INSERT INTO public.country_name
103                     (country_code, name, country_default_language_code, partition) VALUES %s
104                 """, params)
105         conn.commit()
106
107
108 def create_country_names(conn, tokenizer, languages=None):
109     """ Add default country names to search index. `languages` is a comma-
110         separated list of language codes as used in OSM. If `languages` is not
111         empty then only name translations for the given languages are added
112         to the index.
113     """
114     if languages:
115         languages = languages.split(',')
116
117     def _include_key(key):
118         return key == _COUNTRY_INFO.key_prefix() or \
119             (key.startswith(_COUNTRY_INFO.key_prefix()+':') and
120              (not languages or key[len(_COUNTRY_INFO.key_prefix())+1:] in languages))
121
122     with conn.cursor() as cur:
123         psycopg2.extras.register_hstore(cur)
124         cur.execute("""SELECT country_code, name FROM country_name
125                        WHERE country_code is not null""")
126
127         with tokenizer.name_analyzer() as analyzer:
128             for code, name in cur:
129                 names = {'countrycode': code}
130                 if code == 'gb':
131                     names['short_name'] = 'UK'
132                 if code == 'us':
133                     names['short_name'] = 'United States'
134
135                 # country names (only in languages as provided)
136                 if name:
137                     names.update(((k, v)
138                                   for k, v in name.items() if _include_key(k)))
139
140                 analyzer.add_country_names(code, names)
141
142     conn.commit()