mirror of
https://github.com/osm-search/Nominatim.git
synced 2024-12-27 23:15:12 +03:00
121 lines
3.8 KiB
Python
121 lines
3.8 KiB
Python
"""
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Functions for importing tiger data and handling tarbar and directory files
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"""
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import logging
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import os
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import tarfile
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import selectors
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from nominatim.db.connection import connect
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from nominatim.db.async_connection import DBConnection
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from nominatim.db.sql_preprocessor import SQLPreprocessor
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LOG = logging.getLogger()
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def handle_tarfile_or_directory(data_dir):
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""" Handles tarfile or directory for importing tiger data
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"""
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tar = None
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if data_dir.endswith('.tar.gz'):
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tar = tarfile.open(data_dir)
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sql_files = [i for i in tar.getmembers() if i.name.endswith('.sql')]
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LOG.warning("Found %d SQL files in tarfile with path %s", len(sql_files), data_dir)
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if not sql_files:
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LOG.warning("Tiger data import selected but no files in tarfile's path %s", data_dir)
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return None, None
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else:
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files = os.listdir(data_dir)
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sql_files = [os.path.join(data_dir, i) for i in files if i.endswith('.sql')]
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LOG.warning("Found %d SQL files in path %s", len(sql_files), data_dir)
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if not sql_files:
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LOG.warning("Tiger data import selected but no files found in path %s", data_dir)
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return None, None
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return sql_files, tar
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def handle_threaded_sql_statements(sel, file):
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""" Handles sql statement with multiplexing
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"""
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lines = 0
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end_of_file = False
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# Using pool of database connections to execute sql statements
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while not end_of_file:
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for key, _ in sel.select(1):
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conn = key.data
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try:
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if conn.is_done():
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sql_query = file.readline()
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lines += 1
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if not sql_query:
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end_of_file = True
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break
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conn.perform(sql_query)
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if lines == 1000:
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print('. ', end='', flush=True)
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lines = 0
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except Exception as exc: # pylint: disable=broad-except
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LOG.info('Wrong SQL statement: %s', exc)
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def handle_unregister_connection_pool(sel, place_threads):
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""" Handles unregistering pool of connections
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"""
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while place_threads > 0:
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for key, _ in sel.select(1):
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conn = key.data
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sel.unregister(conn)
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try:
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conn.wait()
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except Exception as exc: # pylint: disable=broad-except
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LOG.info('Wrong SQL statement: %s', exc)
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conn.close()
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place_threads -= 1
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def add_tiger_data(data_dir, config, threads):
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""" Import tiger data from directory or tar file `data dir`.
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"""
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dsn = config.get_libpq_dsn()
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sql_files, tar = handle_tarfile_or_directory(data_dir)
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if not sql_files:
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return
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with connect(dsn) as conn:
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sql = SQLPreprocessor(conn, config)
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sql.run_sql_file(conn, 'tiger_import_start.sql')
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# Reading sql_files and then for each file line handling
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# sql_query in <threads - 1> chunks.
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sel = selectors.DefaultSelector()
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place_threads = max(1, threads - 1)
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# Creates a pool of database connections
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for _ in range(place_threads):
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conn = DBConnection(dsn)
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conn.connect()
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sel.register(conn, selectors.EVENT_WRITE, conn)
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for sql_file in sql_files:
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if not tar:
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file = open(sql_file)
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else:
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file = tar.extractfile(sql_file)
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handle_threaded_sql_statements(sel, file)
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# Unregistering pool of database connections
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handle_unregister_connection_pool(sel, place_threads)
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if tar:
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tar.close()
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print('\n')
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LOG.warning("Creating indexes on Tiger data")
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with connect(dsn) as conn:
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sql = SQLPreprocessor(conn, config)
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sql.run_sql_file(conn, 'tiger_import_finish.sql')
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