271 lines
11 KiB
Python
271 lines
11 KiB
Python
from __future__ import unicode_literals
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import os
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import gzip
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import zipfile
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from optparse import make_option
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from django.conf import settings
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from django.core import serializers
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from django.core.management.base import BaseCommand, CommandError
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from django.core.management.color import no_style
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from django.db import (connections, router, transaction, DEFAULT_DB_ALIAS,
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IntegrityError, DatabaseError)
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from django.db.models import get_apps
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from django.utils.encoding import force_text
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from itertools import product
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try:
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import bz2
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has_bz2 = True
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except ImportError:
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has_bz2 = False
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class Command(BaseCommand):
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help = 'Installs the named fixture(s) in the database.'
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args = "fixture [fixture ...]"
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option_list = BaseCommand.option_list + (
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make_option('--database', action='store', dest='database',
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default=DEFAULT_DB_ALIAS, help='Nominates a specific database to load '
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'fixtures into. Defaults to the "default" database.'),
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make_option('--ignorenonexistent', '-i', action='store_true', dest='ignore',
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default=False, help='Ignores entries in the serialized data for fields'
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' that do not currently exist on the model.'),
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)
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def handle(self, *fixture_labels, **options):
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self.ignore = options.get('ignore')
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self.using = options.get('database')
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connection = connections[self.using]
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if not len(fixture_labels):
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raise CommandError(
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"No database fixture specified. Please provide the path of at "
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"least one fixture in the command line."
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)
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self.verbosity = int(options.get('verbosity'))
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# commit is a stealth option - it isn't really useful as
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# a command line option, but it can be useful when invoking
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# loaddata from within another script.
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# If commit=True, loaddata will use its own transaction;
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# if commit=False, the data load SQL will become part of
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# the transaction in place when loaddata was invoked.
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commit = options.get('commit', True)
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# Keep a count of the installed objects and fixtures
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self.fixture_count = 0
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self.loaded_object_count = 0
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self.fixture_object_count = 0
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self.models = set()
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# Get a cursor (even though we don't need one yet). This has
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# the side effect of initializing the test database (if
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# it isn't already initialized).
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cursor = connection.cursor()
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# Start transaction management. All fixtures are installed in a
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# single transaction to ensure that all references are resolved.
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if commit:
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transaction.commit_unless_managed(using=self.using)
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transaction.enter_transaction_management(using=self.using)
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transaction.managed(True, using=self.using)
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class SingleZipReader(zipfile.ZipFile):
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def __init__(self, *args, **kwargs):
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zipfile.ZipFile.__init__(self, *args, **kwargs)
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if settings.DEBUG:
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assert len(self.namelist()) == 1, "Zip-compressed fixtures must contain only one file."
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def read(self):
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return zipfile.ZipFile.read(self, self.namelist()[0])
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self.compression_types = {
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None: open,
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'gz': gzip.GzipFile,
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'zip': SingleZipReader
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}
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if has_bz2:
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self.compression_types['bz2'] = bz2.BZ2File
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app_module_paths = []
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for app in get_apps():
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if hasattr(app, '__path__'):
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# It's a 'models/' subpackage
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for path in app.__path__:
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app_module_paths.append(path)
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else:
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# It's a models.py module
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app_module_paths.append(app.__file__)
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app_fixtures = [os.path.join(os.path.dirname(path), 'fixtures') for path in app_module_paths]
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try:
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with connection.constraint_checks_disabled():
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for fixture_label in fixture_labels:
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self.load_label(fixture_label, app_fixtures)
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# Since we disabled constraint checks, we must manually check for
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# any invalid keys that might have been added
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table_names = [model._meta.db_table for model in self.models]
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try:
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connection.check_constraints(table_names=table_names)
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except Exception as e:
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e.args = ("Problem installing fixtures: %s" % e,)
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raise
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except (SystemExit, KeyboardInterrupt):
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raise
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except Exception as e:
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if commit:
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transaction.rollback(using=self.using)
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transaction.leave_transaction_management(using=self.using)
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raise
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# If we found even one object in a fixture, we need to reset the
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# database sequences.
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if self.loaded_object_count > 0:
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sequence_sql = connection.ops.sequence_reset_sql(no_style(), self.models)
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if sequence_sql:
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if self.verbosity >= 2:
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self.stdout.write("Resetting sequences\n")
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for line in sequence_sql:
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cursor.execute(line)
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if commit:
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transaction.commit(using=self.using)
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transaction.leave_transaction_management(using=self.using)
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if self.verbosity >= 1:
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if self.fixture_object_count == self.loaded_object_count:
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self.stdout.write("Installed %d object(s) from %d fixture(s)" % (
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self.loaded_object_count, self.fixture_count))
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else:
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self.stdout.write("Installed %d object(s) (of %d) from %d fixture(s)" % (
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self.loaded_object_count, self.fixture_object_count, self.fixture_count))
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# Close the DB connection. This is required as a workaround for an
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# edge case in MySQL: if the same connection is used to
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# create tables, load data, and query, the query can return
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# incorrect results. See Django #7572, MySQL #37735.
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if commit:
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connection.close()
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def load_label(self, fixture_label, app_fixtures):
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parts = fixture_label.split('.')
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if len(parts) > 1 and parts[-1] in self.compression_types:
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compression_formats = [parts[-1]]
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parts = parts[:-1]
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else:
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compression_formats = self.compression_types.keys()
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if len(parts) == 1:
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fixture_name = parts[0]
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formats = serializers.get_public_serializer_formats()
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else:
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fixture_name, format = '.'.join(parts[:-1]), parts[-1]
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if format in serializers.get_public_serializer_formats():
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formats = [format]
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else:
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formats = []
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if formats:
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if self.verbosity >= 2:
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self.stdout.write("Loading '%s' fixtures..." % fixture_name)
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else:
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raise CommandError(
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"Problem installing fixture '%s': %s is not a known serialization format." %
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(fixture_name, format))
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if os.path.isabs(fixture_name):
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fixture_dirs = [fixture_name]
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else:
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fixture_dirs = app_fixtures + list(settings.FIXTURE_DIRS) + ['']
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for fixture_dir in fixture_dirs:
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self.process_dir(fixture_dir, fixture_name, compression_formats,
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formats)
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def process_dir(self, fixture_dir, fixture_name, compression_formats,
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serialization_formats):
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humanize = lambda dirname: "'%s'" % dirname if dirname else 'absolute path'
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if self.verbosity >= 2:
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self.stdout.write("Checking %s for fixtures..." % humanize(fixture_dir))
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label_found = False
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for combo in product([self.using, None], serialization_formats, compression_formats):
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database, format, compression_format = combo
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file_name = '.'.join(
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p for p in [
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fixture_name, database, format, compression_format
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]
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if p
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)
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if self.verbosity >= 3:
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self.stdout.write("Trying %s for %s fixture '%s'..." % \
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(humanize(fixture_dir), file_name, fixture_name))
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full_path = os.path.join(fixture_dir, file_name)
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open_method = self.compression_types[compression_format]
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try:
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fixture = open_method(full_path, 'r')
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except IOError:
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if self.verbosity >= 2:
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self.stdout.write("No %s fixture '%s' in %s." % \
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(format, fixture_name, humanize(fixture_dir)))
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else:
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try:
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if label_found:
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raise CommandError("Multiple fixtures named '%s' in %s. Aborting." %
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(fixture_name, humanize(fixture_dir)))
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self.fixture_count += 1
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objects_in_fixture = 0
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loaded_objects_in_fixture = 0
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if self.verbosity >= 2:
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self.stdout.write("Installing %s fixture '%s' from %s." % \
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(format, fixture_name, humanize(fixture_dir)))
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objects = serializers.deserialize(format, fixture, using=self.using, ignorenonexistent=self.ignore)
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for obj in objects:
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objects_in_fixture += 1
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if router.allow_syncdb(self.using, obj.object.__class__):
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loaded_objects_in_fixture += 1
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self.models.add(obj.object.__class__)
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try:
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obj.save(using=self.using)
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except (DatabaseError, IntegrityError) as e:
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e.args = ("Could not load %(app_label)s.%(object_name)s(pk=%(pk)s): %(error_msg)s" % {
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'app_label': obj.object._meta.app_label,
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'object_name': obj.object._meta.object_name,
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'pk': obj.object.pk,
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'error_msg': force_text(e)
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},)
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raise
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self.loaded_object_count += loaded_objects_in_fixture
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self.fixture_object_count += objects_in_fixture
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label_found = True
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except Exception as e:
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if not isinstance(e, CommandError):
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e.args = ("Problem installing fixture '%s': %s" % (full_path, e),)
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raise
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finally:
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fixture.close()
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# If the fixture we loaded contains 0 objects, assume that an
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# error was encountered during fixture loading.
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if objects_in_fixture == 0:
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raise CommandError(
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"No fixture data found for '%s'. (File format may be invalid.)" %
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(fixture_name))
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