1 # SPDX-License-Identifier: GPL-2.0-only
3 # This file is part of Nominatim. (https://nominatim.org)
5 # Copyright (C) 2022 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.config import Configuration
20 from nominatim.db.connection import connect
21 from nominatim.db.async_connection import WorkerPool
22 from nominatim.db.sql_preprocessor import SQLPreprocessor
23 from nominatim.errors import UsageError
24 from nominatim.data.place_info import PlaceInfo
25 from nominatim.tokenizer.base import AbstractAnalyzer, AbstractTokenizer
26 from nominatim.tools import freeze
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')