X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/8f2746fe24d51cab464960c2679da5b09e7da882..2d1a22705f7f2f067f2c839c32caf55941a37b01:/nominatim/tools/postcodes.py diff --git a/nominatim/tools/postcodes.py b/nominatim/tools/postcodes.py index 9bcdf2e5..2b7027e7 100644 --- a/nominatim/tools/postcodes.py +++ b/nominatim/tools/postcodes.py @@ -1,3 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# This file is part of Nominatim. (https://nominatim.org) +# +# Copyright (C) 2022 by the Nominatim developer community. +# For a full list of authors see the git log. """ Functions for importing, updating and otherwise maintaining the table of artificial postcode centroids. @@ -5,20 +11,32 @@ of artificial postcode centroids. import csv import gzip import logging +from math import isfinite -from psycopg2.extras import execute_values +from psycopg2 import sql as pysql from nominatim.db.connection import connect LOG = logging.getLogger() +def _to_float(num, max_value): + """ Convert the number in string into a float. The number is expected + to be in the range of [-max_value, max_value]. Otherwise rises a + ValueError. + """ + num = float(num) + if not isfinite(num) or num <= -max_value or num >= max_value: + raise ValueError() + + return num + class _CountryPostcodesCollector: """ Collector for postcodes of a single country. """ def __init__(self, country): self.country = country - self.collected = dict() + self.collected = {} def add(self, postcode, x, y): @@ -40,27 +58,26 @@ class _CountryPostcodesCollector: with conn.cursor() as cur: if to_add: - execute_values(cur, - """INSERT INTO location_postcode - (place_id, indexed_status, country_code, - postcode, geometry) VALUES %s""", - to_add, - template="""(nextval('seq_place'), 1, '{}', - %s, 'SRID=4326;POINT(%s %s)') - """.format(self.country)) + cur.execute_values( + """INSERT INTO location_postcode + (place_id, indexed_status, country_code, + postcode, geometry) VALUES %s""", + to_add, + template=pysql.SQL("""(nextval('seq_place'), 1, {}, + %s, 'SRID=4326;POINT(%s %s)') + """).format(pysql.Literal(self.country))) if to_delete: cur.execute("""DELETE FROM location_postcode WHERE country_code = %s and postcode = any(%s) """, (self.country, to_delete)) if to_update: - execute_values(cur, - """UPDATE location_postcode - SET indexed_status = 2, - geometry = ST_SetSRID(ST_Point(v.x, v.y), 4326) - FROM (VALUES %s) AS v (pc, x, y) - WHERE country_code = '{}' and postcode = pc - """.format(self.country), - to_update) + cur.execute_values( + pysql.SQL("""UPDATE location_postcode + SET indexed_status = 2, + geometry = ST_SetSRID(ST_Point(v.x, v.y), 4326) + FROM (VALUES %s) AS v (pc, x, y) + WHERE country_code = {} and postcode = pc + """).format(pysql.Literal(self.country)), to_update) def _compute_changes(self, conn): @@ -108,7 +125,8 @@ class _CountryPostcodesCollector: postcode = analyzer.normalize_postcode(row['postcode']) if postcode not in self.collected: try: - self.collected[postcode] = (float(row['lon']), float(row['lat'])) + self.collected[postcode] = (_to_float(row['lon'], 180), + _to_float(row['lat'], 90)) except ValueError: LOG.warning("Bad coordinates %s, %s in %s country postcode file.", row['lat'], row['lon'], self.country) @@ -118,13 +136,13 @@ class _CountryPostcodesCollector: def _open_external(self, project_dir): - fname = project_dir / '{}_postcodes.csv'.format(self.country) + fname = project_dir / f'{self.country}_postcodes.csv' if fname.is_file(): LOG.info("Using external postcode file '%s'.", fname) - return open(fname, 'r') + return open(fname, 'r', encoding='utf-8') - fname = project_dir / '{}_postcodes.csv.gz'.format(self.country) + fname = project_dir / f'{self.country}_postcodes.csv.gz' if fname.is_file(): LOG.info("Using external postcode file '%s'.", fname) @@ -150,17 +168,20 @@ def update_postcodes(dsn, project_dir, tokenizer): # Recompute the list of valid postcodes from placex. with conn.cursor(name="placex_postcodes") as cur: - cur.execute("""SELECT country_code, pc, ST_X(centroid), ST_Y(centroid) - FROM ( - SELECT country_code, - token_normalized_postcode(address->'postcode') as pc, - ST_Centroid(ST_Collect(ST_Centroid(geometry))) as centroid - FROM placex - WHERE address ? 'postcode' and geometry IS NOT null - and country_code is not null - GROUP BY country_code, pc) xx - WHERE pc is not null - ORDER BY country_code, pc""") + cur.execute(""" + SELECT cc as country_code, pc, ST_X(centroid), ST_Y(centroid) + FROM (SELECT + COALESCE(plx.country_code, + get_country_code(ST_Centroid(pl.geometry))) as cc, + token_normalized_postcode(pl.address->'postcode') as pc, + ST_Centroid(ST_Collect(COALESCE(plx.centroid, + ST_Centroid(pl.geometry)))) as centroid + FROM place AS pl LEFT OUTER JOIN placex AS plx + ON pl.osm_id = plx.osm_id AND pl.osm_type = plx.osm_type + WHERE pl.address ? 'postcode' AND pl.geometry IS NOT null + GROUP BY cc, pc) xx + WHERE pc IS NOT null AND cc IS NOT null + ORDER BY country_code, pc""") collector = None @@ -182,3 +203,11 @@ def update_postcodes(dsn, project_dir, tokenizer): conn.commit() analyzer.update_postcodes_from_db() + +def can_compute(dsn): + """ + Check that the place table exists so that + postcodes can be computed. + """ + with connect(dsn) as conn: + return conn.table_exists('place')