X-Git-Url: https://git.openstreetmap.org./nominatim.git/blobdiff_plain/a4aba23a83b0d8b3817ca88d4556cf26dbb17706..a08ef43e40fc940050cf962913677285b58493ef:/nominatim/tools/postcodes.py diff --git a/nominatim/tools/postcodes.py b/nominatim/tools/postcodes.py index 7a0a0e07..cfd242e2 100644 --- a/nominatim/tools/postcodes.py +++ b/nominatim/tools/postcodes.py @@ -5,6 +5,7 @@ of artificial postcode centroids. import csv import gzip import logging +from math import isfinite from psycopg2.extras import execute_values @@ -12,6 +13,17 @@ 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. """ @@ -35,23 +47,26 @@ class _CountryPostcodesCollector: self._update_from_external(analyzer, project_dir) to_add, to_delete, to_update = self._compute_changes(conn) + LOG.info("Processing country '%s' (%s added, %s deleted, %s updated).", + self.country, len(to_add), len(to_delete), len(to_update)) + with conn.cursor() as cur: if to_add: execute_values(cur, - """INSERT INTO location_postcodes - (place_id, indexed_status, countrycode, + """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)) if to_delete: - cur.execute("""DELETE FROM location_postcodes + 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_postcodes + """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) @@ -62,22 +77,22 @@ class _CountryPostcodesCollector: def _compute_changes(self, conn): """ Compute which postcodes from the collected postcodes have to be - added or modified and which from the location_postcodes table + added or modified and which from the location_postcode table have to be deleted. """ to_update = [] to_delete = [] with conn.cursor() as cur: cur.execute("""SELECT postcode, ST_X(geometry), ST_Y(geometry) - FROM location_postcodes + FROM location_postcode WHERE country_code = %s""", (self.country, )) for postcode, x, y in cur: - oldx, oldy = self.collected.pop(postcode, (None, None)) - if oldx is not None: - dist = (x - oldx)**2 + (y - oldy)**2 - if dist > 0.000001: - to_update.append(postcode, x, y) + newx, newy = self.collected.pop(postcode, (None, None)) + if newx is not None: + dist = (x - newx)**2 + (y - newy)**2 + if dist > 0.0000001: + to_update.append((postcode, newx, newy)) else: to_delete.append(postcode) @@ -105,7 +120,8 @@ 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) @@ -139,17 +155,25 @@ def update_postcodes(dsn, project_dir, tokenizer): """ with tokenizer.name_analyzer() as analyzer: with connect(dsn) as conn: - with conn.cursor("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 - GROUP BY country_code, pc) xx - WHERE pc is not null - ORDER BY country_code, pc""") + # First get the list of countries that currently have postcodes. + # (Doing this before starting to insert, so it is fast on import.) + with conn.cursor() as cur: + cur.execute("SELECT DISTINCT country_code FROM location_postcode") + todo_countries = set((row[0] for row in cur)) + + # Recompute the list of valid postcodes from placex. + with conn.cursor(name="placex_postcodes") as cur: + 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 @@ -158,11 +182,24 @@ def update_postcodes(dsn, project_dir, tokenizer): if collector is not None: collector.commit(conn, analyzer, project_dir) collector = _CountryPostcodesCollector(country) + todo_countries.discard(country) collector.add(postcode, x, y) if collector is not None: collector.commit(conn, analyzer, project_dir) + # Now handle any countries that are only in the postcode table. + for country in todo_countries: + _CountryPostcodesCollector(country).commit(conn, analyzer, project_dir) + conn.commit() - analyzer.add_postcodes_from_db() + 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')