nominatim/api/lookup.py

   1 # SPDX-License-Identifier: GPL-3.0-or-later
   2 #
   3 # This file is part of Nominatim. (https://nominatim.org)
   4 #
   5 # Copyright (C) 2023 by the Nominatim developer community.
   6 # For a full list of authors see the git log.
   7 """
   8 Implementation of place lookup by ID.
   9 """
  10 from typing import Optional, Callable, Tuple, Type
  11 import datetime as dt
  12
  13 import sqlalchemy as sa
  14
  15 from nominatim.typing import SaColumn, SaRow, SaSelect
  16 from nominatim.api.connection import SearchConnection
  17 import nominatim.api.types as ntyp
  18 import nominatim.api.results as nres
  19 from nominatim.api.logging import log
  20
  21 RowFunc = Callable[[Optional[SaRow], Type[nres.BaseResultT]], Optional[nres.BaseResultT]]
  22
  23 GeomFunc = Callable[[SaSelect, SaColumn], SaSelect]
  24
  25
  26
  27 async def find_in_placex(conn: SearchConnection, place: ntyp.PlaceRef,
  28                          add_geometries: GeomFunc) -> Optional[SaRow]:
  29     """ Search for the given place in the placex table and return the
  30         base information.
  31     """
  32     log().section("Find in placex table")
  33     t = conn.t.placex
  34     sql = sa.select(t.c.place_id, t.c.osm_type, t.c.osm_id, t.c.name,
  35                     t.c.class_, t.c.type, t.c.admin_level,
  36                     t.c.address, t.c.extratags,
  37                     t.c.housenumber, t.c.postcode, t.c.country_code,
  38                     t.c.importance, t.c.wikipedia, t.c.indexed_date,
  39                     t.c.parent_place_id, t.c.rank_address, t.c.rank_search,
  40                     t.c.linked_place_id,
  41                     t.c.centroid)
  42
  43     if isinstance(place, ntyp.PlaceID):
  44         sql = sql.where(t.c.place_id == place.place_id)
  45     elif isinstance(place, ntyp.OsmID):
  46         sql = sql.where(t.c.osm_type == place.osm_type)\
  47                  .where(t.c.osm_id == place.osm_id)
  48         if place.osm_class:
  49             sql = sql.where(t.c.class_ == place.osm_class)
  50         else:
  51             sql = sql.order_by(t.c.class_)
  52         sql = sql.limit(1)
  53     else:
  54         return None
  55
  56     return (await conn.execute(add_geometries(sql, t.c.geometry))).one_or_none()
  57
  58
  59 async def find_in_osmline(conn: SearchConnection, place: ntyp.PlaceRef,
  60                           add_geometries: GeomFunc) -> Optional[SaRow]:
  61     """ Search for the given place in the osmline table and return the
  62         base information.
  63     """
  64     log().section("Find in interpolation table")
  65     t = conn.t.osmline
  66     sql = sa.select(t.c.place_id, t.c.osm_id, t.c.parent_place_id,
  67                     t.c.indexed_date, t.c.startnumber, t.c.endnumber,
  68                     t.c.step, t.c.address, t.c.postcode, t.c.country_code,
  69                     t.c.linegeo.ST_Centroid().label('centroid'))
  70
  71     if isinstance(place, ntyp.PlaceID):
  72         sql = sql.where(t.c.place_id == place.place_id)
  73     elif isinstance(place, ntyp.OsmID) and place.osm_type == 'W':
  74         # There may be multiple interpolations for a single way.
  75         # If 'class' contains a number, return the one that belongs to that number.
  76         sql = sql.where(t.c.osm_id == place.osm_id).limit(1)
  77         if place.osm_class and place.osm_class.isdigit():
  78             sql = sql.order_by(sa.func.greatest(0,
  79                                     sa.func.least(int(place.osm_class) - t.c.endnumber),
  80                                            t.c.startnumber - int(place.osm_class)))
  81     else:
  82         return None
  83
  84     return (await conn.execute(add_geometries(sql, t.c.linegeo))).one_or_none()
  85
  86
  87 async def find_in_tiger(conn: SearchConnection, place: ntyp.PlaceRef,
  88                         add_geometries: GeomFunc) -> Optional[SaRow]:
  89     """ Search for the given place in the table of Tiger addresses and return
  90         the base information. Only lookup by place ID is supported.
  91     """
  92     if not isinstance(place, ntyp.PlaceID):
  93         return None
  94
  95     log().section("Find in TIGER table")
  96     t = conn.t.tiger
  97     parent = conn.t.placex
  98     sql = sa.select(t.c.place_id, t.c.parent_place_id,
  99                     parent.c.osm_type, parent.c.osm_id,
 100                     t.c.startnumber, t.c.endnumber, t.c.step,
 101                     t.c.postcode,
 102                     t.c.linegeo.ST_Centroid().label('centroid'))\
 103             .where(t.c.place_id == place.place_id)\
 104             .join(parent, t.c.parent_place_id == parent.c.place_id, isouter=True)
 105
 106     return (await conn.execute(add_geometries(sql, t.c.linegeo))).one_or_none()
 107
 108
 109 async def find_in_postcode(conn: SearchConnection, place: ntyp.PlaceRef,
 110                            add_geometries: GeomFunc) -> Optional[SaRow]:
 111     """ Search for the given place in the postcode table and return the
 112         base information. Only lookup by place ID is supported.
 113     """
 114     if not isinstance(place, ntyp.PlaceID):
 115         return None
 116
 117     log().section("Find in postcode table")
 118     t = conn.t.postcode
 119     sql = sa.select(t.c.place_id, t.c.parent_place_id,
 120                     t.c.rank_search, t.c.rank_address,
 121                     t.c.indexed_date, t.c.postcode, t.c.country_code,
 122                     t.c.geometry.label('centroid')) \
 123             .where(t.c.place_id == place.place_id)
 124
 125     return (await conn.execute(add_geometries(sql, t.c.geometry))).one_or_none()
 126
 127
 128 async def find_in_all_tables(conn: SearchConnection, place: ntyp.PlaceRef,
 129                              add_geometries: GeomFunc
 130                             ) -> Tuple[Optional[SaRow], RowFunc[nres.BaseResultT]]:
 131     """ Search for the given place in all data tables
 132         and return the base information.
 133     """
 134     row = await find_in_placex(conn, place, add_geometries)
 135     log().var_dump('Result (placex)', row)
 136     if row is not None:
 137         return row, nres.create_from_placex_row
 138
 139     row = await find_in_osmline(conn, place, add_geometries)
 140     log().var_dump('Result (osmline)', row)
 141     if row is not None:
 142         return row, nres.create_from_osmline_row
 143
 144     row = await find_in_postcode(conn, place, add_geometries)
 145     log().var_dump('Result (postcode)', row)
 146     if row is not None:
 147         return row, nres.create_from_postcode_row
 148
 149     row = await find_in_tiger(conn, place, add_geometries)
 150     log().var_dump('Result (tiger)', row)
 151     return row, nres.create_from_tiger_row
 152
 153
 154 async def get_detailed_place(conn: SearchConnection, place: ntyp.PlaceRef,
 155                              details: ntyp.LookupDetails) -> Optional[nres.DetailedResult]:
 156     """ Retrieve a place with additional details from the database.
 157     """
 158     log().function('get_detailed_place', place=place, details=details)
 159
 160     if details.geometry_output and details.geometry_output != ntyp.GeometryFormat.GEOJSON:
 161         raise ValueError("lookup only supports geojosn polygon output.")
 162
 163     if details.geometry_output & ntyp.GeometryFormat.GEOJSON:
 164         def _add_geometry(sql: SaSelect, column: SaColumn) -> SaSelect:
 165             return sql.add_columns(sa.literal_column(f"""
 166                       ST_AsGeoJSON(CASE WHEN ST_NPoints({column.name}) > 5000
 167                                    THEN ST_SimplifyPreserveTopology({column.name}, 0.0001)
 168                                    ELSE {column.name} END)
 169                        """).label('geometry_geojson'))
 170     else:
 171         def _add_geometry(sql: SaSelect, column: SaColumn) -> SaSelect:
 172             return sql.add_columns(sa.func.ST_GeometryType(column).label('geometry_type'))
 173
 174     row_func: RowFunc[nres.DetailedResult]
 175     row, row_func = await find_in_all_tables(conn, place, _add_geometry)
 176
 177     if row is None:
 178         return None
 179
 180     result = row_func(row, nres.DetailedResult)
 181     assert result is not None
 182
 183     # add missing details
 184     assert result is not None
 185     result.parent_place_id = row.parent_place_id
 186     result.linked_place_id = getattr(row, 'linked_place_id', None)
 187     result.admin_level = getattr(row, 'admin_level', 15)
 188     indexed_date = getattr(row, 'indexed_date', None)
 189     if indexed_date is not None:
 190         result.indexed_date = indexed_date.replace(tzinfo=dt.timezone.utc)
 191
 192     await nres.add_result_details(conn, result, details)
 193
 194     return result
 195
 196
 197 async def get_simple_place(conn: SearchConnection, place: ntyp.PlaceRef,
 198                              details: ntyp.LookupDetails) -> Optional[nres.SearchResult]:
 199     """ Retrieve a place as a simple search result from the database.
 200     """
 201     log().function('get_simple_place', place=place, details=details)
 202
 203     def _add_geometry(sql: SaSelect, col: SaColumn) -> SaSelect:
 204         if not details.geometry_output:
 205             return sql
 206
 207         out = []
 208
 209         if details.geometry_simplification > 0.0:
 210             col = col.ST_SimplifyPreserveTopology(details.geometry_simplification)
 211
 212         if details.geometry_output & ntyp.GeometryFormat.GEOJSON:
 213             out.append(col.ST_AsGeoJSON().label('geometry_geojson'))
 214         if details.geometry_output & ntyp.GeometryFormat.TEXT:
 215             out.append(col.ST_AsText().label('geometry_text'))
 216         if details.geometry_output & ntyp.GeometryFormat.KML:
 217             out.append(col.ST_AsKML().label('geometry_kml'))
 218         if details.geometry_output & ntyp.GeometryFormat.SVG:
 219             out.append(col.ST_AsSVG().label('geometry_svg'))
 220
 221         return sql.add_columns(*out)
 222
 223
 224     row_func: RowFunc[nres.SearchResult]
 225     row, row_func = await find_in_all_tables(conn, place, _add_geometry)
 226
 227     if row is None:
 228         return None
 229
 230     result = row_func(row, nres.SearchResult)
 231     assert result is not None
 232
 233     # add missing details
 234     assert result is not None
 235     result.bbox = getattr(row, 'bbox', None)
 236
 237     await nres.add_result_details(conn, result, details)
 238
 239     return result