forked from hans/Nominatim
74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
# SPDX-License-Identifier: GPL-3.0-or-later
|
|
#
|
|
# This file is part of Nominatim. (https://nominatim.org)
|
|
#
|
|
# Copyright (C) 2024 by the Nominatim developer community.
|
|
# For a full list of authors see the git log.
|
|
"""
|
|
Helper functions for handling DB accesses.
|
|
"""
|
|
from typing import IO, Optional, Union
|
|
import subprocess
|
|
import logging
|
|
import gzip
|
|
from pathlib import Path
|
|
|
|
from .connection import get_pg_env
|
|
from ..errors import UsageError
|
|
|
|
LOG = logging.getLogger()
|
|
|
|
def _pipe_to_proc(proc: 'subprocess.Popen[bytes]',
|
|
fdesc: Union[IO[bytes], gzip.GzipFile]) -> int:
|
|
assert proc.stdin is not None
|
|
chunk = fdesc.read(2048)
|
|
while chunk and proc.poll() is None:
|
|
try:
|
|
proc.stdin.write(chunk)
|
|
except BrokenPipeError as exc:
|
|
raise UsageError("Failed to execute SQL file.") from exc
|
|
chunk = fdesc.read(2048)
|
|
|
|
return len(chunk)
|
|
|
|
def execute_file(dsn: str, fname: Path,
|
|
ignore_errors: bool = False,
|
|
pre_code: Optional[str] = None,
|
|
post_code: Optional[str] = None) -> None:
|
|
""" Read an SQL file and run its contents against the given database
|
|
using psql. Use `pre_code` and `post_code` to run extra commands
|
|
before or after executing the file. The commands are run within the
|
|
same session, so they may be used to wrap the file execution in a
|
|
transaction.
|
|
"""
|
|
cmd = ['psql']
|
|
if not ignore_errors:
|
|
cmd.extend(('-v', 'ON_ERROR_STOP=1'))
|
|
if not LOG.isEnabledFor(logging.INFO):
|
|
cmd.append('--quiet')
|
|
|
|
with subprocess.Popen(cmd, env=get_pg_env(dsn), stdin=subprocess.PIPE) as proc:
|
|
assert proc.stdin is not None
|
|
try:
|
|
if not LOG.isEnabledFor(logging.INFO):
|
|
proc.stdin.write('set client_min_messages to WARNING;'.encode('utf-8'))
|
|
|
|
if pre_code:
|
|
proc.stdin.write((pre_code + ';').encode('utf-8'))
|
|
|
|
if fname.suffix == '.gz':
|
|
with gzip.open(str(fname), 'rb') as fdesc:
|
|
remain = _pipe_to_proc(proc, fdesc)
|
|
else:
|
|
with fname.open('rb') as fdesc:
|
|
remain = _pipe_to_proc(proc, fdesc)
|
|
|
|
if remain == 0 and post_code:
|
|
proc.stdin.write((';' + post_code).encode('utf-8'))
|
|
finally:
|
|
proc.stdin.close()
|
|
ret = proc.wait()
|
|
|
|
if ret != 0 or remain > 0:
|
|
raise UsageError("Failed to execute SQL file.")
|