Initial commit.

.gitignore

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+*.pyc
+*.DS_Store*

AUTHORS

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+John Wehr <johnwehr@gmail.com>

LICENSE

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+Everything else:
+http://www.opensource.org/licenses/mit-license.php
+
+Copyright (c) 2011 John Wehr
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

cassorm/__init__.py

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+from .list import CassandraList
+from .model import CassandraModel
+from .dict import CassandraDict
+from .types import DateTime, DateTimeString, Float64, FloatString, Int64, IntString, String
+from .tests import CassandraListTest, CassandraModelTest, CassandraDictTest

cassorm/dict.py

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+from django.conf import settings
+import pycassa
+from pycassa.system_manager import SystemManager
+
+
+MANAGER_MAPS = {}
+
+
+class CassandraKeyError(KeyError):
+    pass
+
+
+class CassandraDictManager(pycassa.ColumnFamily):
+    """Manager for CassandraDict, provides schema creation."""
+
+    def __init__(self, cls):
+        self.cls = cls    
+        super(CassandraDictManager, self).__init__(
+            settings.CASSANDRA_POOL, 
+            self.cls.__name__.lower())
+
+
+class CassandraMetaDict(type):
+    """Metaclass for CassandraDict, provides access to CassandraDictManager"""
+
+    @property
+    def objects(cls):
+        """CassandraListManager Singletons"""
+        if cls.__name__ not in MANAGER_MAPS:
+            MANAGER_MAPS[id(cls)] = CassandraDictManager(cls)
+        return MANAGER_MAPS[id(cls)]
+
+    def sync(cls, default_validation_class=None, destructive=False):
+        """Create the Cassandra List schema."""
+        if default_validation_class is None:
+            default_validation_class = cls.default_validation_class
+        sys = SystemManager(settings.CASSANDRA_SERVERS[0])
+        if destructive:
+            try:
+                sys.drop_column_family(settings.CASSANDRA_KEYSPACE, cls.__name__.lower())
+            except:
+                pass
+        sys.create_column_family(
+            settings.CASSANDRA_KEYSPACE, 
+            cls.__name__.lower(), 
+            comparator_type=pycassa.UTF8_TYPE,
+            default_validation_class=default_validation_class)
+        sys.close()
+
+
+class CassandraDict(object):
+    "A dictionary that stores its data persistantly in Cassandra"
+
+    default_validation_class = pycassa.UTF8_TYPE
+
+    __metaclass__ = CassandraMetaDict
+
+    def __init__(self, row_key):
+        self.row_key = row_key
+        self.cf = self.__class__.objects
+
+    def get(self, key, default=None):
+        try:
+            return self.cf.get(self.row_key, columns=[key]).values()[0]
+        except pycassa.NotFoundException, e:
+            if default is None:
+                raise CassandraKeyError(key)
+            else:
+                return default
+
+    def __getitem__(self, key):
+        try:
+            return self.cf.get(self.row_key, columns=[key]).values()[0]
+        except pycassa.NotFoundException, e:
+            raise CassandraKeyError(key)
+
+    def __setitem__(self, key, value):
+        return self.cf.insert(self.row_key, {key:value})
+
+    def __delitem__(self, key):
+        return self.cf.remove(self.row_key, columns=[key])
+
+    def update(self, d):
+        return self.cf.insert(self.row_key, d)
+
+    def keys(self):
+        try:
+            return self.cf.get(self.row_key).keys()
+        except pycassa.NotFoundException, e:
+            return []
+
+    def values(self):
+        try:
+            return self.cf.get(self.row_key).values()
+        except pycassa.NotFoundException, e:
+            return []
+
+    def items(self):
+        try:
+            return self.cf.get(self.row_key)
+        except pycassa.NotFoundException, e:
+            return []
+
+    def iterkeys(self):
+        return self.keys()
+
+    def itervalues(self):
+        return self.values()
+
+    def iteritems(self):
+        return self.items()
+
+    def has_key(self, key):
+        return key in dict(self.items())
+
+    def __contains__(self, key):
+        return self.has_key(key)
+
+    def __len__(self):
+        return self.cf.get_count(self.row_key)
+
+    def __del__(self):
+        self.cf.remove(self.row_key)

cassorm/list.py

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+import time
+import uuid
+from django.conf import settings
+import pycassa
+from pycassa.util import convert_time_to_uuid, convert_uuid_to_time
+from pycassa.system_manager import SystemManager
+from .exceptions import CassandraIndexError
+
+MANAGER_MAPS = {}
+
+class CassandraIndexError(IndexError):
+    pass
+
+class CassandraListManager(pycassa.ColumnFamily):
+    """Manager for CassandraList."""
+
+    def __init__(self, cls):
+        self.cls = cls    
+        super(CassandraListManager, self).__init__(
+            settings.CASSANDRA_POOL, 
+            self.cls.__name__.lower())
+
+
+class CassandraMetaList(type):
+    """Metaclass for CassandraList, provides schema creation, 
+       access to CassandraListManager"""
+
+    @property
+    def objects(cls):
+        """CassandraListManager Singletons"""
+        if cls.__name__ not in MANAGER_MAPS:
+            MANAGER_MAPS[id(cls)] = CassandraListManager(cls)
+        return MANAGER_MAPS[id(cls)]        
+
+    def sync(cls, default_validation_class=None, destructive=False):
+        """Create the Cassandra List schema."""
+        if default_validation_class is None:
+            default_validation_class = cls.default_validation_class
+        sys = SystemManager(settings.CASSANDRA_SERVERS[0])
+        if destructive:
+            try:
+                sys.drop_column_family(settings.CASSANDRA_KEYSPACE, cls.__name__.lower())
+            except:
+                pass
+        sys.create_column_family(
+            settings.CASSANDRA_KEYSPACE, 
+            cls.__name__.lower(), 
+            comparator_type=pycassa.TIME_UUID_TYPE,
+            default_validation_class=default_validation_class)
+        sys.close()
+
+
+class CassandraList(object):
+
+    default_validation_class = pycassa.UTF8_TYPE
+
+    __metaclass__ = CassandraMetaList
+
+    def __init__(self, row_key):
+        self.row_key = row_key
+        self.cf = self.__class__.objects
+
+    def append(self, x):
+        self.cf.insert(self.row_key, {time.time():x})
+
+    def extend(self, seq):
+        rows = {}
+        start = uuid.UUID("{%s}" % convert_time_to_uuid(time.time()))
+        i = 0
+        for x in seq:
+            rows[uuid.UUID(int=start.int + i)] = unicode(x)
+            i += 10
+        self.cf.insert(self.row_key, rows)
+
+    def insert(self, i, x):
+        try:
+            seq = self.cf.get(self.row_key, column_count=i + 1)
+        except pycassa.NotFoundException, e:
+            self.append(x)
+            return
+        if i >= len(seq):
+            self.append(x)
+            return
+        old_key = seq.keys().pop()
+        old_key_time = convert_uuid_to_time(old_key)
+        low, high = convert_time_to_uuid(old_key_time, randomize=True), \
+            convert_time_to_uuid(old_key_time, randomize=True)
+        if low > high:
+            high, low = low, high
+        while high > old_key:
+            low, high = convert_time_to_uuid(old_key_time, randomize=True), \
+                convert_time_to_uuid(old_key_time, randomize=True)
+            if low > high:
+                high, low = low, high
+        old_value = self.cf.get(self.row_key, columns=[old_key]).values().pop()
+        self.cf.insert(self.row_key, {high:old_value})
+        self.cf.insert(self.row_key, {low:x})
+        self.cf.remove(self.row_key, columns=[old_key])
+
+    def pop(self):
+        try:
+            item = self.cf.get(self.row_key, column_count=1, column_reversed=True)
+        except pycassa.NotFoundException, e:
+            raise CassandraIndexError("pop from empty list")
+        self.cf.remove(self.row_key, columns=item.keys())
+        return item.values()[0]
+
+    def remove(self, x):
+        column_start = ""
+        while 1:
+            try:
+                columns = self.cf.get(self.row_key, column_start=column_start, column_count=100)
+            except pycassa.NotFoundException, e:
+                return
+            for key in columns:
+                if columns[key] == x:
+                    self.cf.remove(self.row_key, columns=[key])
+            key = uuid.UUID("{%s}" % key)
+            column_start = uuid.UUID(int=key.int + 1)
+
+    def delete(self):
+        self.cf.remove(self.row_key)
+
+    def __len__(self):
+        return self.cf.get_count(self.row_key)
+
+    def __str__(self):
+        try:
+            return str([x[1] for x in self.cf.get(self.row_key).items()])
+        except pycassa.NotFoundException, e:
+            return str([]) 
+
+    def __getitem__(self, val):
+        if isinstance(val, slice):
+            if (val.step is None or val.step > 0) and val.stop is not None:
+                seq = [x[1] for x in self.cf.get(self.row_key, column_count=val.stop).items()]
+                return seq[val.start:val.stop:val.step]
+            seq = [x[1] for x in self.cf.get(self.row_key).items()]
+            return seq[val.start:val.stop:val.step]
+        elif isinstance(val, int):
+            try:
+                return self[val:val + 1].pop()
+            except Exception, e:
+                raise CassandraIndexError("List index out of range.")
+        else:
+            return super(CassandraList, self).__getitem__(val)