--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/roundup/backends/sessions.py	Tue Jul 30 08:22:38 2002 +0000
@@ -0,0 +1,101 @@
+#$Id: sessions.py,v 1.1 2002-07-30 08:22:38 richard Exp $
+'''
+This module defines a very basic store that's used by the CGI interface
+to store session information.
+'''
+
+import anydbm, whichdb, os, marshal
+
+class Sessions:
+    ''' Back onto an anydbm store.
+
+        Keys are session id strings, values are marshalled data.
+    '''
+    def __init__(self, config):
+        self.config = config
+        self.dir = config.DATABASE
+        # ensure files are group readable and writable
+        os.umask(0002)
+
+    def clear(self):
+        path = os.path.join(self.dir, 'sessions')
+        if os.path.exists(path):
+            os.remove(path)
+        elif os.path.exists(path+'.db'):    # dbm appends .db
+            os.remove(path+'.db')
+
+    def determine_db_type(self, path):
+        ''' determine which DB wrote the class file
+        '''
+        db_type = ''
+        if os.path.exists(path):
+            db_type = whichdb.whichdb(path)
+            if not db_type:
+                raise hyperdb.DatabaseError, "Couldn't identify database type"
+        elif os.path.exists(path+'.db'):
+            # if the path ends in '.db', it's a dbm database, whether
+            # anydbm says it's dbhash or not!
+            db_type = 'dbm'
+        return db_type
+
+    def get(self, sessionid, value):
+        db = self.opendb('c')
+        try:
+            if db.has_key(sessionid):
+                values = marshal.loads(db[sessionid])
+            else:
+                return None
+            return values.get(value, None)
+        finally:
+            db.close()
+
+    def set(self, sessionid, **newvalues):
+        db = self.opendb('c')
+        try:
+            if db.has_key(sessionid):
+                values = marshal.loads(db[sessionid])
+            else:
+                values = {}
+            values.update(newvalues)
+            db[sessionid] = marshal.dumps(values)
+        finally:
+            db.close()
+
+    def list(self):
+        db = self.opendb('r')
+        try:
+            return db.keys()
+        finally:
+            db.close()
+
+    def destroy(self, sessionid):
+        db = self.opendb('c')
+        try:
+            if db.has_key(sessionid):
+                del db[sessionid]
+        finally:
+            db.close()
+
+    def opendb(self, mode):
+        '''Low-level database opener that gets around anydbm/dbm
+           eccentricities.
+        '''
+        # figure the class db type
+        path = os.path.join(os.getcwd(), self.dir, 'sessions')
+        db_type = self.determine_db_type(path)
+
+        # new database? let anydbm pick the best dbm
+        if not db_type:
+            return anydbm.open(path, 'n')
+
+        # open the database with the correct module
+        dbm = __import__(db_type)
+        return dbm.open(path, mode)
+
+    def commit(self):
+        pass
+
+#
+#$Log: not supported by cvs2svn $
+#
+#