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114 lines
3.3 KiB
Python
114 lines
3.3 KiB
Python
# SPDX-License-Identifier: GPL-2.0-only
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#
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# This file is part of Nominatim. (https://nominatim.org)
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#
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# Copyright (C) 2022 by the Nominatim developer community.
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# For a full list of authors see the git log.
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"""
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Helper functions for handling DB accesses.
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"""
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import subprocess
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import logging
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import gzip
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import io
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from nominatim.db.connection import get_pg_env
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from nominatim.errors import UsageError
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LOG = logging.getLogger()
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def _pipe_to_proc(proc, fdesc):
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chunk = fdesc.read(2048)
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while chunk and proc.poll() is None:
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try:
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proc.stdin.write(chunk)
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except BrokenPipeError as exc:
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raise UsageError("Failed to execute SQL file.") from exc
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chunk = fdesc.read(2048)
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return len(chunk)
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def execute_file(dsn, fname, ignore_errors=False, pre_code=None, post_code=None):
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""" Read an SQL file and run its contents against the given database
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using psql. Use `pre_code` and `post_code` to run extra commands
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before or after executing the file. The commands are run within the
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same session, so they may be used to wrap the file execution in a
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transaction.
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"""
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cmd = ['psql']
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if not ignore_errors:
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cmd.extend(('-v', 'ON_ERROR_STOP=1'))
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if not LOG.isEnabledFor(logging.INFO):
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cmd.append('--quiet')
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proc = subprocess.Popen(cmd, env=get_pg_env(dsn), stdin=subprocess.PIPE)
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try:
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if not LOG.isEnabledFor(logging.INFO):
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proc.stdin.write('set client_min_messages to WARNING;'.encode('utf-8'))
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if pre_code:
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proc.stdin.write((pre_code + ';').encode('utf-8'))
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if fname.suffix == '.gz':
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with gzip.open(str(fname), 'rb') as fdesc:
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remain = _pipe_to_proc(proc, fdesc)
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else:
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with fname.open('rb') as fdesc:
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remain = _pipe_to_proc(proc, fdesc)
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if remain == 0 and post_code:
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proc.stdin.write((';' + post_code).encode('utf-8'))
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finally:
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proc.stdin.close()
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ret = proc.wait()
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if ret != 0 or remain > 0:
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raise UsageError("Failed to execute SQL file.")
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# List of characters that need to be quoted for the copy command.
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_SQL_TRANSLATION = {ord(u'\\'): u'\\\\',
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ord(u'\t'): u'\\t',
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ord(u'\n'): u'\\n'}
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class CopyBuffer:
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""" Data collector for the copy_from command.
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"""
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def __init__(self):
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self.buffer = io.StringIO()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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if self.buffer is not None:
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self.buffer.close()
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def add(self, *data):
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""" Add another row of data to the copy buffer.
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"""
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first = True
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for column in data:
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if first:
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first = False
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else:
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self.buffer.write('\t')
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if column is None:
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self.buffer.write('\\N')
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else:
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self.buffer.write(str(column).translate(_SQL_TRANSLATION))
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self.buffer.write('\n')
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def copy_out(self, cur, table, columns=None):
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""" Copy all collected data into the given table.
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"""
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if self.buffer.tell() > 0:
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self.buffer.seek(0)
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cur.copy_from(self.buffer, table, columns=columns)
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