author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Wed, 15 Apr 2009 15:56:17 +0000 | |
changeset 2185 | 09ca8e661728 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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Load ../vendor/django into trunk/app/django.
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1 |
import errno |
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import os |
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import tempfile |
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from django.conf import settings |
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from django.contrib.sessions.backends.base import SessionBase, CreateError |
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from django.core.exceptions import SuspiciousOperation, ImproperlyConfigured |
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class SessionStore(SessionBase): |
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""" |
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Implements a file based session store. |
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""" |
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def __init__(self, session_key=None): |
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self.storage_path = getattr(settings, "SESSION_FILE_PATH", None) |
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if not self.storage_path: |
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self.storage_path = tempfile.gettempdir() |
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# Make sure the storage path is valid. |
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if not os.path.isdir(self.storage_path): |
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raise ImproperlyConfigured( |
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"The session storage path %r doesn't exist. Please set your" |
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" SESSION_FILE_PATH setting to an existing directory in which" |
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" Django can store session data." % self.storage_path) |
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self.file_prefix = settings.SESSION_COOKIE_NAME |
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super(SessionStore, self).__init__(session_key) |
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def _key_to_file(self, session_key=None): |
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""" |
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Get the file associated with this session key. |
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""" |
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if session_key is None: |
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session_key = self.session_key |
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# Make sure we're not vulnerable to directory traversal. Session keys |
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# should always be md5s, so they should never contain directory |
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# components. |
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if os.path.sep in session_key: |
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raise SuspiciousOperation( |
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"Invalid characters (directory components) in session key") |
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return os.path.join(self.storage_path, self.file_prefix + session_key) |
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def load(self): |
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session_data = {} |
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try: |
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session_file = open(self._key_to_file(), "rb") |
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try: |
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file_data = session_file.read() |
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# Don't fail if there is no data in the session file. |
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# We may have opened the empty placeholder file. |
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if file_data: |
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try: |
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session_data = self.decode(file_data) |
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except (EOFError, SuspiciousOperation): |
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self.create() |
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finally: |
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session_file.close() |
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except IOError: |
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pass |
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return session_data |
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def create(self): |
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while True: |
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self._session_key = self._get_new_session_key() |
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try: |
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self.save(must_create=True) |
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except CreateError: |
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continue |
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self.modified = True |
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self._session_cache = {} |
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return |
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def save(self, must_create=False): |
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# Get the session data now, before we start messing |
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# with the file it is stored within. |
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session_data = self._get_session(no_load=must_create) |
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session_file_name = self._key_to_file() |
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try: |
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# Make sure the file exists. If it does not already exist, an |
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# empty placeholder file is created. |
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flags = os.O_WRONLY | os.O_CREAT | getattr(os, 'O_BINARY', 0) |
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if must_create: |
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flags |= os.O_EXCL |
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fd = os.open(session_file_name, flags) |
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os.close(fd) |
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except OSError, e: |
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if must_create and e.errno == errno.EEXIST: |
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raise CreateError |
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raise |
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# Write the session file without interfering with other threads |
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# or processes. By writing to an atomically generated temporary |
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# file and then using the atomic os.rename() to make the complete |
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# file visible, we avoid having to lock the session file, while |
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# still maintaining its integrity. |
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101 |
# |
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102 |
# Note: Locking the session file was explored, but rejected in part |
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103 |
# because in order to be atomic and cross-platform, it required a |
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104 |
# long-lived lock file for each session, doubling the number of |
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105 |
# files in the session storage directory at any given time. This |
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106 |
# rename solution is cleaner and avoids any additional overhead |
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107 |
# when reading the session data, which is the more common case |
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108 |
# unless SESSION_SAVE_EVERY_REQUEST = True. |
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109 |
# |
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110 |
# See ticket #8616. |
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111 |
dir, prefix = os.path.split(session_file_name) |
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112 |
|
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113 |
try: |
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114 |
output_file_fd, output_file_name = tempfile.mkstemp(dir=dir, |
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115 |
prefix=prefix + '_out_') |
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116 |
renamed = False |
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Load ../vendor/django into trunk/app/django.
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117 |
try: |
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parents:
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118 |
try: |
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119 |
os.write(output_file_fd, self.encode(session_data)) |
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120 |
finally: |
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121 |
os.close(output_file_fd) |
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122 |
os.rename(output_file_name, session_file_name) |
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123 |
renamed = True |
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124 |
finally: |
323
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125 |
if not renamed: |
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126 |
os.unlink(output_file_name) |
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127 |
|
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128 |
except (OSError, IOError, EOFError): |
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129 |
pass |
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130 |
|
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131 |
def exists(self, session_key): |
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132 |
if os.path.exists(self._key_to_file(session_key)): |
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133 |
return True |
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|
134 |
return False |
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|
135 |
|
323
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Load ../vendor/django into trunk/app/django.
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parents:
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|
136 |
def delete(self, session_key=None): |
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parents:
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|
137 |
if session_key is None: |
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Load ../vendor/django into trunk/app/django.
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parents:
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changeset
|
138 |
if self._session_key is None: |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
139 |
return |
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Load ../vendor/django into trunk/app/django.
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parents:
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|
140 |
session_key = self._session_key |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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changeset
|
141 |
try: |
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Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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|
142 |
os.unlink(self._key_to_file(session_key)) |
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parents:
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|
143 |
except OSError: |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
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parents:
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changeset
|
144 |
pass |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
145 |
|
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
146 |
def clean(self): |
03e267d67478
Major reorganization of the soc svn repo, to merge into a single App Engine
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
147 |
pass |