262 lines
11 KiB
Python
262 lines
11 KiB
Python
import csv
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import itertools
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import logging
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import os
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import shlex
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from borgmatic.execute import (
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execute_command,
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execute_command_and_capture_output,
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execute_command_with_processes,
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)
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from borgmatic.hooks import dump
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logger = logging.getLogger(__name__)
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def make_dump_path(location_config): # pragma: no cover
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'''
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Make the dump path from the given location configuration and the name of this hook.
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'''
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return dump.make_database_dump_path(
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location_config.get('borgmatic_source_directory'), 'postgresql_databases'
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)
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def make_extra_environment(database):
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'''
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Make the extra_environment dict from the given database configuration.
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'''
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extra = dict()
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if 'password' in database:
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extra['PGPASSWORD'] = database['password']
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extra['PGSSLMODE'] = database.get('ssl_mode', 'disable')
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if 'ssl_cert' in database:
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extra['PGSSLCERT'] = database['ssl_cert']
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if 'ssl_key' in database:
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extra['PGSSLKEY'] = database['ssl_key']
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if 'ssl_root_cert' in database:
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extra['PGSSLROOTCERT'] = database['ssl_root_cert']
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if 'ssl_crl' in database:
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extra['PGSSLCRL'] = database['ssl_crl']
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return extra
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EXCLUDED_DATABASE_NAMES = ('template0', 'template1')
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def database_names_to_dump(database, extra_environment, log_prefix, dry_run):
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'''
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Given a requested database config, return the corresponding sequence of database names to dump.
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In the case of "all" when a database format is given, query for the names of databases on the
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configured host and return them. For "all" without a database format, just return a sequence
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containing "all".
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'''
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requested_name = database['name']
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if requested_name != 'all':
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return (requested_name,)
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if not database.get('format'):
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return ('all',)
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if dry_run:
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return ()
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psql_command = shlex.split(database.get('psql_command') or 'psql')
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list_command = (
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tuple(psql_command)
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+ ('--list', '--no-password', '--no-psqlrc', '--csv', '--tuples-only')
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+ (('--host', database['hostname']) if 'hostname' in database else ())
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+ (('--port', str(database['port'])) if 'port' in database else ())
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+ (('--username', database['username']) if 'username' in database else ())
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+ (tuple(database['list_options'].split(' ')) if 'list_options' in database else ())
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)
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logger.debug(f'{log_prefix}: Querying for "all" PostgreSQL databases to dump')
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list_output = execute_command_and_capture_output(
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list_command, extra_environment=extra_environment
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)
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return tuple(
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row[0]
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for row in csv.reader(list_output.splitlines(), delimiter=',', quotechar='"')
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if row[0] not in EXCLUDED_DATABASE_NAMES
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)
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def dump_databases(databases, log_prefix, location_config, dry_run):
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'''
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Dump the given PostgreSQL databases to a named pipe. The databases are supplied as a sequence of
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dicts, one dict describing each database as per the configuration schema. Use the given log
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prefix in any log entries. Use the given location configuration dict to construct the
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destination path.
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Return a sequence of subprocess.Popen instances for the dump processes ready to spew to a named
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pipe. But if this is a dry run, then don't actually dump anything and return an empty sequence.
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Raise ValueError if the databases to dump cannot be determined.
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'''
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dry_run_label = ' (dry run; not actually dumping anything)' if dry_run else ''
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processes = []
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logger.info(f'{log_prefix}: Dumping PostgreSQL databases{dry_run_label}')
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for database in databases:
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extra_environment = make_extra_environment(database)
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dump_path = make_dump_path(location_config)
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dump_database_names = database_names_to_dump(
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database, extra_environment, log_prefix, dry_run
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)
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if not dump_database_names:
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if dry_run:
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continue
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raise ValueError('Cannot find any PostgreSQL databases to dump.')
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for database_name in dump_database_names:
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dump_format = database.get('format', None if database_name == 'all' else 'custom')
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default_dump_command = 'pg_dumpall' if database_name == 'all' else 'pg_dump'
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dump_command = database.get('pg_dump_command') or default_dump_command
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dump_filename = dump.make_database_dump_filename(
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dump_path, database_name, database.get('hostname')
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)
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if os.path.exists(dump_filename):
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logger.warning(
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f'{log_prefix}: Skipping duplicate dump of PostgreSQL database "{database_name}" to {dump_filename}'
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)
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continue
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command = (
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(
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dump_command,
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'--no-password',
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'--clean',
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'--if-exists',
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)
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+ (('--host', database['hostname']) if 'hostname' in database else ())
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+ (('--port', str(database['port'])) if 'port' in database else ())
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+ (('--username', database['username']) if 'username' in database else ())
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+ (('--format', dump_format) if dump_format else ())
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+ (('--file', dump_filename) if dump_format == 'directory' else ())
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+ (tuple(database['options'].split(' ')) if 'options' in database else ())
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+ (() if database_name == 'all' else (database_name,))
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# Use shell redirection rather than the --file flag to sidestep synchronization issues
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# when pg_dump/pg_dumpall tries to write to a named pipe. But for the directory dump
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# format in a particular, a named destination is required, and redirection doesn't work.
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+ (('>', dump_filename) if dump_format != 'directory' else ())
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)
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logger.debug(
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f'{log_prefix}: Dumping PostgreSQL database "{database_name}" to {dump_filename}{dry_run_label}'
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)
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if dry_run:
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continue
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if dump_format == 'directory':
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dump.create_parent_directory_for_dump(dump_filename)
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execute_command(
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command,
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shell=True,
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extra_environment=extra_environment,
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)
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else:
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dump.create_named_pipe_for_dump(dump_filename)
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processes.append(
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execute_command(
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command,
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shell=True,
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extra_environment=extra_environment,
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run_to_completion=False,
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)
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)
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return processes
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def remove_database_dumps(databases, log_prefix, location_config, dry_run): # pragma: no cover
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'''
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Remove all database dump files for this hook regardless of the given databases. Use the log
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prefix in any log entries. Use the given location configuration dict to construct the
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destination path. If this is a dry run, then don't actually remove anything.
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'''
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dump.remove_database_dumps(make_dump_path(location_config), 'PostgreSQL', log_prefix, dry_run)
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def make_database_dump_pattern(
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databases, log_prefix, location_config, name=None
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): # pragma: no cover
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'''
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Given a sequence of configurations dicts, a prefix to log with, a location configuration dict,
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and a database name to match, return the corresponding glob patterns to match the database dump
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in an archive.
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'''
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return dump.make_database_dump_filename(make_dump_path(location_config), name, hostname='*')
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def restore_database_dump(database_config, log_prefix, location_config, dry_run, extract_process):
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'''
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Restore the given PostgreSQL database from an extract stream. The database is supplied as a
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one-element sequence containing a dict describing the database, as per the configuration schema.
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Use the given log prefix in any log entries. If this is a dry run, then don't actually restore
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anything. Trigger the given active extract process (an instance of subprocess.Popen) to produce
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output to consume.
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If the extract process is None, then restore the dump from the filesystem rather than from an
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extract stream.
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'''
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dry_run_label = ' (dry run; not actually restoring anything)' if dry_run else ''
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if len(database_config) != 1:
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raise ValueError('The database configuration value is invalid')
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database = database_config[0]
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all_databases = bool(database['name'] == 'all')
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dump_filename = dump.make_database_dump_filename(
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make_dump_path(location_config), database['name'], database.get('hostname')
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)
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psql_command = shlex.split(database.get('psql_command') or 'psql')
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analyze_command = (
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tuple(psql_command)
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+ ('--no-password', '--no-psqlrc', '--quiet')
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+ (('--host', database['hostname']) if 'hostname' in database else ())
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+ (('--port', str(database['port'])) if 'port' in database else ())
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+ (('--username', database['username']) if 'username' in database else ())
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+ (('--dbname', database['name']) if not all_databases else ())
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+ (tuple(database['analyze_options'].split(' ')) if 'analyze_options' in database else ())
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+ ('--command', 'ANALYZE')
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)
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use_psql_command = all_databases or database.get('format') == 'plain'
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pg_restore_command = shlex.split(database.get('pg_restore_command') or 'pg_restore')
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restore_command = (
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tuple(psql_command if use_psql_command else pg_restore_command)
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+ ('--no-password',)
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+ (('--no-psqlrc',) if use_psql_command else ('--if-exists', '--exit-on-error', '--clean'))
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+ (('--dbname', database['name']) if not all_databases else ())
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+ (('--host', database['hostname']) if 'hostname' in database else ())
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+ (('--port', str(database['port'])) if 'port' in database else ())
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+ (('--username', database['username']) if 'username' in database else ())
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+ (tuple(database['restore_options'].split(' ')) if 'restore_options' in database else ())
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+ (() if extract_process else (dump_filename,))
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+ tuple(
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itertools.chain.from_iterable(('--schema', schema) for schema in database['schemas'])
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if database['schemas']
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else ()
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)
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)
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extra_environment = make_extra_environment(database)
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logger.debug(f"{log_prefix}: Restoring PostgreSQL database {database['name']}{dry_run_label}")
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if dry_run:
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return
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# Don't give Borg local path so as to error on warnings, as "borg extract" only gives a warning
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# if the restore paths don't exist in the archive.
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execute_command_with_processes(
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restore_command,
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[extract_process] if extract_process else [],
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output_log_level=logging.DEBUG,
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input_file=extract_process.stdout if extract_process else None,
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extra_environment=extra_environment,
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)
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execute_command(analyze_command, extra_environment=extra_environment)
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