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Nick Johnson Arachnid

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Caveats:
- Calling put on a fetched entity more than once has extra overhead.
- Putting entities that have been concurrently modified since they were fetched has extra overhead even outside transactions.
- Creating and putting an entity to overwrite one already in the datastore has extra overhead.
- Attempting to create and put an entity in a transaction when one already exists in the datastore will fail.
- Strings are sorted by a 'smart' caseless sort rather than by unicode codepoint.
- Custom indexes with multiple sort orders are not supported.
- Does not (currently) support merge joins, so no support for multiple equality filters with no composite index.
Bonuses:
View datastore_get_cache.py
import logging
from google.appengine.api import memcache
from google.appengine.api import apiproxy_stub_map
from google.appengine.datastore import datastore_pb
"""Provides a shim that caches datastore Get calls.
Example code:
import datastore_get_cache
View geocell.py
import math
def between(a, b, c):
return a <= b and b <= c
class Region(object):
def intersects(self, other):
raise NotImplemented(
"%s does not know how to check for intersection with %s"
View datastore_cache.py
"""Modifies the App Engine datastore to support local caching of entities.
This is achieved by monkeypatching google.appengine.ext.db to recognise model
classes that should be cached and store them locally for the duration of a
single page request.
Note that only datastore gets (and anything that relies on them, such as
ReferenceProperty fetches) are cached; queries will neither return cached
entities nor update the cache.
View packager.py
#!/usr/bin/python
"""Converts Python packages into app-engine-friendly zips or directories."""
import logging
import optparse
import os
import re
import sys
import zipfile
View auth.py
import base
import config
import model
import simploid
import urllib
from openid.extensions import sreg
from google.appengine.ext.db import djangoforms
from django import newforms as forms
View datastorefile.py
import logging
import os
import StringIO
from google.appengine.ext import db
BLOCK_NAME_FMT = '#%.8X'
class Inode(db.Model):
DEFAULT_BLOCK_SIZE = 524288
View members.xml
<?xml version="1.0" encoding="UTF-8"?>
<Module>
<ModulePrefs title="Members"
description="Awaken your community with the members gadget which lets visitors join your site, sign in, and invite their friends. They can even explore the profiles of other members and make new friends."
author="Google"
author_email="friendconnect-feedback+gadgets@google.com"
thumbnail="http://www.google.com/friendconnect/static/images/thumb/members.png"
screenshot="http://www.google.com/friendconnect/static/images/thumb/members.png"
>
<Require feature="dynamic-height"/>
View gist:109302
<?xml version="1.0" encoding="UTF-8"?>
<Module>
<ModulePrefs title="Members"
description="Awaken your community with the members gadget which lets visitors join your site, sign in, and invite their friends. They can even explore the profiles of other members and make new friends."
author="Google"
author_email="friendconnect-feedback+gadgets@google.com"
thumbnail="http://www.google.com/friendconnect/static/images/thumb/members.png"
screenshot="http://www.google.com/friendconnect/static/images/thumb/members.png"
>
<Require feature="dynamic-height"/>
View kinditerator.py
import logging
from google.appengine.ext import db
class KindIterator(object):
def __init__(self, kind, filters=None, batch_size=100):
self.kind = kind
if filters:
self.filters = filters
else:
self.filters = []
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