1 # SPDX-License-Identifier: GPL-3.0-or-later
3 # This file is part of Nominatim. (https://nominatim.org)
5 # Copyright (C) 2024 by the Nominatim developer community.
6 # For a full list of authors see the git log.
8 Functions for importing tiger data and handling tarbar and directory files
10 from typing import Any, TextIO, List, Union, cast
17 from psycopg2.extras import Json
19 from nominatim_core.config import Configuration
20 from nominatim_core.db.connection import connect
21 from nominatim_core.db.async_connection import WorkerPool
22 from nominatim_core.db.sql_preprocessor import SQLPreprocessor
23 from nominatim_core.errors import UsageError
24 from ..data.place_info import PlaceInfo
25 from ..tokenizer.base import AbstractAnalyzer, AbstractTokenizer
28 LOG = logging.getLogger()
31 """ Context manager that goes through Tiger input files which may
32 either be in a directory or gzipped together in a tar file.
35 def __init__(self, data_dir: str) -> None:
36 self.tar_handle = None
37 self.files: List[Union[str, tarfile.TarInfo]] = []
39 if data_dir.endswith('.tar.gz'):
41 self.tar_handle = tarfile.open(data_dir) # pylint: disable=consider-using-with
42 except tarfile.ReadError as err:
43 LOG.fatal("Cannot open '%s'. Is this a tar file?", data_dir)
44 raise UsageError("Cannot open Tiger data file.") from err
46 self.files = [i for i in self.tar_handle.getmembers() if i.name.endswith('.csv')]
47 LOG.warning("Found %d CSV files in tarfile with path %s", len(self.files), data_dir)
49 files = os.listdir(data_dir)
50 self.files = [os.path.join(data_dir, i) for i in files if i.endswith('.csv')]
51 LOG.warning("Found %d CSV files in path %s", len(self.files), data_dir)
54 LOG.warning("Tiger data import selected but no files found at %s", data_dir)
57 def __enter__(self) -> 'TigerInput':
61 def __exit__(self, exc_type: Any, exc_val: Any, exc_tb: Any) -> None:
63 self.tar_handle.close()
64 self.tar_handle = None
67 def next_file(self) -> TextIO:
68 """ Return a file handle to the next file to be processed.
69 Raises an IndexError if there is no file left.
71 fname = self.files.pop(0)
73 if self.tar_handle is not None:
74 extracted = self.tar_handle.extractfile(fname)
75 assert extracted is not None
76 return io.TextIOWrapper(extracted)
78 return open(cast(str, fname), encoding='utf-8')
81 def __len__(self) -> int:
82 return len(self.files)
85 def handle_threaded_sql_statements(pool: WorkerPool, fd: TextIO,
86 analyzer: AbstractAnalyzer) -> None:
87 """ Handles sql statement with multiplexing
90 # Using pool of database connections to execute sql statements
92 sql = "SELECT tiger_line_import(%s, %s, %s, %s, %s, %s)"
94 for row in csv.DictReader(fd, delimiter=';'):
96 address = dict(street=row['street'], postcode=row['postcode'])
97 args = ('SRID=4326;' + row['geometry'],
98 int(row['from']), int(row['to']), row['interpolation'],
99 Json(analyzer.process_place(PlaceInfo({'address': address}))),
100 analyzer.normalize_postcode(row['postcode']))
103 pool.next_free_worker().perform(sql, args=args)
107 print('.', end='', flush=True)
111 def add_tiger_data(data_dir: str, config: Configuration, threads: int,
112 tokenizer: AbstractTokenizer) -> int:
113 """ Import tiger data from directory or tar file `data dir`.
115 dsn = config.get_libpq_dsn()
117 with connect(dsn) as conn:
118 is_frozen = freeze.is_frozen(conn)
122 raise UsageError("Tiger cannot be imported when database frozen (Github issue #3048)")
124 with TigerInput(data_dir) as tar:
128 with connect(dsn) as conn:
129 sql = SQLPreprocessor(conn, config)
130 sql.run_sql_file(conn, 'tiger_import_start.sql')
132 # Reading files and then for each file line handling
133 # sql_query in <threads - 1> chunks.
134 place_threads = max(1, threads - 1)
136 with WorkerPool(dsn, place_threads, ignore_sql_errors=True) as pool:
137 with tokenizer.name_analyzer() as analyzer:
139 with tar.next_file() as fd:
140 handle_threaded_sql_statements(pool, fd, analyzer)
144 LOG.warning("Creating indexes on Tiger data")
145 with connect(dsn) as conn:
146 sql = SQLPreprocessor(conn, config)
147 sql.run_sql_file(conn, 'tiger_import_finish.sql')