テーマ：「SDKを試しに読んでみるよ」 内容：Python on GAEのコードをDatastoreを中心に追いかけてみます。難易度やどこをメインで読むかは参加者の意思とノリ、残り時間次第？ http://atnd.org/events/5951

1. SDK
AppEngine ja night 9 BeerTalk2
@tagomoris

2. tagomoris
TAGOMORI Satoshi /
Twitter: @tagomoris
E-mail: tagomoris@gmail.com
Blog: http://d.hatena.ne.jp/tagomoris/
Projects:
GAETestBase: code.google.com/p/appengine-test-helper
simpleoauth-gae: code.google.com/p/simpleoauth-gae

3. SDK
• AppEngine
• Low level API ProtocolBuffer
•
• ……(
•

4. SDK

5. AppEngine
• Python, Java
• API
• RPC
• Service
•
• MultiQuery batch put

6. MakeSyncCall

7. appspot MSC
SDK

8. Google Python
•
•
•
•
•
•

9. MakeSyncCall

10. MakeSyncCall
MakeCall make_call
9 _MakeSyncCall
(7 )
google.appengine.api.apiproxy_stub.ApiProxyStub
google.appengine.api.apiproxy_stub_map
google.appengine.api.apiproxy_stub_map.ApiProxyStubMap
google.appengine.runtime.apiproxy
google.appengine.api.datastore_file_stub.DatastoreFileStub
google.appengine.datastore.datastore_sqlite_stub.DatastoreSqliteStub
google.appengine.api.images.images_not_implemented_stub.ImageNotImplementedServiceStub
google.appengine.ext.remote_api.remote_api_stub.RemoteStub
google.appengine.ext.remote_api.remote_api_stub.RemoteDatastoreStub

11. •
•

12. ext.db
Taskqueue Users Datastore
ProtocolBuffer Memcache UrlFetch
MakeSyncCall ApiProxyStubMap ApiProxyStubMap
ApiProxy
DatastoreFileStub DatastoreSqliteStub CapabilityStub ServiceStub

13. ext.db
Taskqueue Users Datastore
ProtocolBuffer Memcache UrlFetch
MakeSyncCall ApiProxyStubMap ApiProxyStubMap
ApiProxy
DatastoreFileStub DatastoreSqliteStub CapabilityStub ServiceStub

14. Python
MakeAsyncCall
Java

15. Google
• import
import google.appengine.ext.db.*
Model.get(...)
from google.appengine.ext import db
db.Model.get(...)

16. Google
•
# google/appengine/api/datastore.py
def _FindTransactionFrameInStack():
....
_CurrenyTransactionKey = _FindTransactionFrameinstack
# google/appengine/ext/db/__init__.py
run_in_transaction = datastore.RunInTransaction
...
RunInTransaction = run_in_transaction

17. 1. demos/guestbook/guestbook.py
2. google/appengine/ext/db/__init__.py
3. google/appengine/api/datastore.py
4. google/appengine/api/apiproxy_stub_map.py
5. google/appengine/runtime/apiproxy.py