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https://github.com/osm-search/Nominatim.git
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60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
"""
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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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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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