Persistent Session Management with Durus

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|Hi,

I'm developing an application using Quixote 2.6 and following the example in altdemo.py pretty closely for persistent session management with Durus.
The application is serving static files very unreliably. One in five requests for a static file receive a HTTP 500 response code. Eg: if an html page embeds 50
script or img tags, requests for about 10 of them will fail. For each of these failed requests, the following traceback is received:

Traceback (most recent call last):
||   File "/usr/lib/python2.4/site-packages/quixote2/publish.py", line 275, in process_request
||     output = self.try_publish(request)
||   File "/usr/lib/python2.4/site-packages/quixote2/publish.py", line 255, in try_publish
||     self.finish_successful_request()
||   File "/usr/lib/python2.4/site-packages/quixote2/publish.py", line 138, in finish_successful_request||
||     self.session_manager.finish_successful_request()
||   File "/usr/lib/python2.4/site-packages/quixote2/session.py", line 388, in finish_successful_request||
||     self.commit_changes(session)
||   File "/usr/lib/python2.4/site-packages/ACE_rms/auth/session.py", line 44, in commit_changes
||     self.durus_connection.commit()
||   File "/usr/lib/python2.4/site-packages/durus/connection.py", line 254, in commit
||     assert not self.invalid_oids, "still conflicted: missing abort()"
||AssertionError: still conflicted: missing abort()

My application is running as a SCGI process behind Apache. Static files are served by Quixote via the StaticDirectory class and not by Apache.
The Durus server runs as a stand-alone process on localhost:2951 and a connection object to it is created as follows:

def publisher_factory ():
     """ returns a quixote2 Publisher instance that publishes
     the RootDirectory with persistent session management support.
     """
     conn = Connection(ClientStorage("127.0.0.1", 2951))
     session_manager = DurusSessionManager(conn)
     return Publisher(RootDirectory(), session_manager=session_manager, display_exceptions='plain')


The application sub-classes SessionManager and Session exactly as described in the snippet below:

----

from quixote2.session import Session, SessionManager
from durus.persistent import Persistent
from durus.persistent_dict import PersistentDict

class PersistentSession (Session, Persistent):
     """ Persistent version of default quixote Session class.
     This class can be overridden if desired.
     """
     pass

class DurusSessionManager (SessionManager):
     """ Loads/stores quixote sessions from/to a Durus db.
     Overrides forget_changes() and commit_changes() as described in quixote
     docs and altdemo.py.
     """

     def __init__ (self, durus_connection, session_class=PersistentSession):
         """ Load sessions from the durus db and init the SessionManager.
         (inst, class) : inst
         durus_connection: a Connection object to a Durus db.
         session_class: session class to use (must override PeristentSession).
         """
         self.durus_connection = durus_connection
         root = self.durus_connection.get_root()
         sessions = root.get('auth.sessions', None)

         if not sessions:
             sessions = PersistentDict()
             root['auth.sessions'] = sessions
             self.durus_connection.commit()

         SessionManager.__init__(self,
                                 session_class=session_class,
                                 session_mapping=sessions)

     def forget_changes (self, session):
         self.durus_connection.abort()

     def commit_changes (self, session):
         self.durus_connection.commit()

-----

Can anyone tell me why my Durus database thinks it's in a conflicted state?

Thank you,
Salman
|||


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<pre role="list"><code class="wrappedText focusRow" role="listitem">Hi,

I'm developing an application using Quixote 2.6 and following the example in altdemo.py pretty closely for persistent session management with Durus.
The application is serving static files very unreliably. One in five requests for a static file receive a HTTP 500 response code. Eg: if an html page embeds 50
script or img tags, requests for about 10 of them will fail. For each of these failed requests, the following traceback is received:

Traceback (most recent call last):
</code><code class="wrappedText focusRow" role="listitem">  File "/usr/lib/python2.4/site-packages/quixote2/publish.py", line 275, in process_request
</code><code class="wrappedText focusRow" role="listitem">    output = self.try_publish(request)
</code><code class="wrappedText focusRow" role="listitem">  File "/usr/lib/python2.4/site-packages/quixote2/publish.py", line 255, in try_publish
</code><code class="wrappedText focusRow" role="listitem">    self.finish_successful_request()
</code><code class="wrappedText focusRow" role="listitem">  File "/usr/lib/python2.4/site-packages/quixote2/publish.py", line 138, in finish_successful_request</code><code
 class="wrappedText focusRow" role="listitem">
</code><code class="wrappedText focusRow" role="listitem">    self.session_manager.finish_successful_request()
</code><code class="wrappedText focusRow" role="listitem">  File "/usr/lib/python2.4/site-packages/quixote2/session.py", line 388, in finish_successful_request</code><code
 class="wrappedText focusRow" role="listitem">
</code><code class="wrappedText focusRow" role="listitem">    self.commit_changes(session)
</code><code class="wrappedText focusRow" role="listitem">  File "/usr/lib/python2.4/site-packages/ACE_rms/auth/session.py", line 44, in commit_changes
</code><code class="wrappedText focusRow" role="listitem">    self.durus_connection.commit()
</code><code class="wrappedText focusRow" role="listitem">  File "/usr/lib/python2.4/site-packages/durus/connection.py", line 254, in commit
</code><code class="wrappedText focusRow" role="listitem">    assert not self.invalid_oids, "still conflicted: missing abort()"
</code><code class="wrappedText focusRow" role="listitem">AssertionError: still conflicted: missing abort()

My application is running as a SCGI process behind Apache. Static files are served by Quixote via the StaticDirectory class and not by Apache.
The Durus server runs as a stand-alone process on localhost:2951 and a connection object to it is created as follows:

def publisher_factory ():
    """ returns a quixote2 Publisher instance that publishes
    the RootDirectory with persistent session management support.
    """
    conn = Connection(ClientStorage("127.0.0.1", 2951))
    session_manager = DurusSessionManager(conn)
    return Publisher(RootDirectory(), session_manager=session_manager, display_exceptions='plain')


The application sub-classes SessionManager and Session exactly as described in the snippet below:

----

from quixote2.session import Session, SessionManager
from durus.persistent import Persistent
from durus.persistent_dict import PersistentDict

class PersistentSession (Session, Persistent):
    """ Persistent version of default quixote Session class.
    This class can be overridden if desired.
    """
    pass

class DurusSessionManager (SessionManager):
    """ Loads/stores quixote sessions from/to a Durus db.
    Overrides forget_changes() and commit_changes() as described in quixote
    docs and altdemo.py.
    """

    def __init__ (self, durus_connection, session_class=PersistentSession):
        """ Load sessions from the durus db and init the SessionManager.
        (inst, class) : inst
        durus_connection: a Connection object to a Durus db.
        session_class: session class to use (must override PeristentSession).
        """
        self.durus_connection = durus_connection
        root = self.durus_connection.get_root()
        sessions = root.get('auth.sessions', None)

        if not sessions:
            sessions = PersistentDict()
            root['auth.sessions'] = sessions
            self.durus_connection.commit()

        SessionManager.__init__(self,
                                session_class=session_class,
                                session_mapping=sessions)

    def forget_changes (self, session):
        self.durus_connection.abort()

    def commit_changes (self, session):
        self.durus_connection.commit()

-----

Can anyone tell me why my Durus database thinks it's in a conflicted state? 

Thank you,
Salman
</code><code class="wrappedText focusRow" role="listitem"></code></pre>
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