mirror of
https://github.com/Relintai/pandemonium_engine.git
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296 lines
9.1 KiB
Python
296 lines
9.1 KiB
Python
# MIT License
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#
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# Copyright The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""
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dblite.py module contributed by Ralf W. Grosse-Kunstleve.
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Extended for Unicode by Steven Knight.
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"""
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import os
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import pickle
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import shutil
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import time
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from SCons.compat import PICKLE_PROTOCOL
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KEEP_ALL_FILES = False
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IGNORE_CORRUPT_DBFILES = False
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def corruption_warning(filename):
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"""Local warning for corrupt db.
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Used for self-tests. SCons overwrites this with a
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different warning function in SConsign.py.
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"""
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print("Warning: Discarding corrupt database:", filename)
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DBLITE_SUFFIX = '.dblite'
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TMP_SUFFIX = '.tmp'
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class dblite:
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"""
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Squirrel away references to the functions in various modules
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that we'll use when our __del__() method calls our sync() method
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during shutdown. We might get destroyed when Python is in the midst
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of tearing down the different modules we import in an essentially
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arbitrary order, and some of the various modules's global attributes
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may already be wiped out from under us.
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See the discussion at:
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http://mail.python.org/pipermail/python-bugs-list/2003-March/016877.html
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"""
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_open = open
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_pickle_dump = staticmethod(pickle.dump)
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_pickle_protocol = PICKLE_PROTOCOL
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try:
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_os_chown = os.chown
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except AttributeError:
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_os_chown = None
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_os_replace = os.replace
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_os_chmod = os.chmod
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_shutil_copyfile = shutil.copyfile
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_time_time = time.time
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def __init__(self, file_base_name, flag, mode):
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assert flag in (None, "r", "w", "c", "n")
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if flag is None:
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flag = "r"
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base, ext = os.path.splitext(file_base_name)
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if ext == DBLITE_SUFFIX:
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# There's already a suffix on the file name, don't add one.
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self._file_name = file_base_name
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self._tmp_name = base + TMP_SUFFIX
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else:
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self._file_name = file_base_name + DBLITE_SUFFIX
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self._tmp_name = file_base_name + TMP_SUFFIX
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self._flag = flag
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self._mode = mode
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self._dict = {}
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self._needs_sync = False
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if self._os_chown is not None and (os.geteuid() == 0 or os.getuid() == 0):
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# running as root; chown back to current owner/group when done
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try:
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statinfo = os.stat(self._file_name)
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self._chown_to = statinfo.st_uid
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self._chgrp_to = statinfo.st_gid
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except OSError:
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# db file doesn't exist yet.
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# Check os.environ for SUDO_UID, use if set
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self._chown_to = int(os.environ.get('SUDO_UID', -1))
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self._chgrp_to = int(os.environ.get('SUDO_GID', -1))
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else:
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self._chown_to = -1 # don't chown
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self._chgrp_to = -1 # don't chgrp
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if self._flag == "n":
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with self._open(self._file_name, "wb", self._mode):
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pass # just make sure it exists
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else:
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try:
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f = self._open(self._file_name, "rb")
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except IOError as e:
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if self._flag != "c":
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raise e
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with self._open(self._file_name, "wb", self._mode):
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pass # just make sure it exists
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else:
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p = f.read()
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f.close()
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if len(p) > 0:
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try:
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self._dict = pickle.loads(p, encoding='bytes')
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except (pickle.UnpicklingError, EOFError, KeyError):
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# Note how we catch KeyErrors too here, which might happen
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# when we don't have cPickle available (default pickle
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# throws it).
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if IGNORE_CORRUPT_DBFILES:
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corruption_warning(self._file_name)
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else:
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raise
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def close(self):
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if self._needs_sync:
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self.sync()
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def __del__(self):
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self.close()
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def sync(self):
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self._check_writable()
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with self._open(self._tmp_name, "wb", self._mode) as f:
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self._pickle_dump(self._dict, f, self._pickle_protocol)
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try:
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self._os_replace(self._tmp_name, self._file_name)
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except PermissionError:
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# If we couldn't replace due to perms, try to change and retry.
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# This is mainly for Windows - on POSIX the file permissions
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# don't matter, the os.replace would have worked anyway.
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# We're giving up if the retry fails, just let the Python
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# exception abort us.
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try:
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self._os_chmod(self._file_name, 0o777)
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except PermissionError:
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pass
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self._os_replace(self._tmp_name, self._file_name)
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if self._os_chown is not None and self._chown_to > 0: # don't chown to root or -1
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try:
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self._os_chown(self._file_name, self._chown_to, self._chgrp_to)
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except OSError:
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pass
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self._needs_sync = False
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if KEEP_ALL_FILES:
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self._shutil_copyfile(
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self._file_name,
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self._file_name + "_" + str(int(self._time_time()))
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)
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def _check_writable(self):
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if self._flag == "r":
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raise IOError("Read-only database: %s" % self._file_name)
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def __getitem__(self, key):
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return self._dict[key]
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def __setitem__(self, key, value):
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self._check_writable()
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if not isinstance(key, str):
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raise TypeError("key `%s' must be a string but is %s" % (key, type(key)))
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if not isinstance(value, bytes):
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raise TypeError("value `%s' must be a bytes but is %s" % (value, type(value)))
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self._dict[key] = value
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self._needs_sync = True
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def keys(self):
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return list(self._dict.keys())
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def __contains__(self, key):
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return key in self._dict
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def __iter__(self):
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return iter(self._dict)
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def __len__(self):
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return len(self._dict)
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def open(file, flag=None, mode=0o666):
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return dblite(file, flag, mode)
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def _exercise():
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db = open("tmp", "n")
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assert len(db) == 0
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db["foo"] = b"bar"
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assert db["foo"] == b"bar"
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db.sync()
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db = open("tmp", "c")
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assert len(db) == 1, len(db)
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assert db["foo"] == b"bar"
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db["bar"] = b"foo"
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assert db["bar"] == b"foo"
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db.sync()
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db = open("tmp", "r")
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assert len(db) == 2, len(db)
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assert db["foo"] == b"bar"
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assert db["bar"] == b"foo"
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try:
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db.sync()
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except IOError as e:
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assert str(e) == "Read-only database: tmp.dblite"
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else:
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raise RuntimeError("IOError expected.")
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db = open("tmp", "w")
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assert len(db) == 2, len(db)
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db["ping"] = b"pong"
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db.sync()
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try:
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db[(1, 2)] = "tuple"
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except TypeError as e:
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assert str(e) == "key `(1, 2)' must be a string but is <class 'tuple'>", str(e)
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else:
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raise RuntimeError("TypeError exception expected")
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try:
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db["list"] = [1, 2]
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except TypeError as e:
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assert str(e) == "value `[1, 2]' must be a bytes but is <class 'list'>", str(e)
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else:
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raise RuntimeError("TypeError exception expected")
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db = open("tmp", "r")
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assert len(db) == 3, len(db)
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db = open("tmp", "n")
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assert len(db) == 0, len(db)
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dblite._open("tmp.dblite", "w")
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db = open("tmp", "r")
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dblite._open("tmp.dblite", "w").write("x")
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try:
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db = open("tmp", "r")
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except pickle.UnpicklingError:
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pass
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else:
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raise RuntimeError("pickle exception expected.")
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global IGNORE_CORRUPT_DBFILES
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IGNORE_CORRUPT_DBFILES = True
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db = open("tmp", "r")
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assert len(db) == 0, len(db)
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os.unlink("tmp.dblite")
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try:
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db = open("tmp", "w")
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except IOError as e:
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assert str(e) == "[Errno 2] No such file or directory: 'tmp.dblite'", str(e)
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else:
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raise RuntimeError("IOError expected.")
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print("Completed _exercise()")
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if __name__ == "__main__":
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_exercise()
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# Local Variables:
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# tab-width:4
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# indent-tabs-mode:nil
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# End:
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# vim: set expandtab tabstop=4 shiftwidth=4:
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