thirdparty/google_appengine/google/appengine/ext/remote_api/handler.py
author Pawel Solyga <Pawel.Solyga@gmail.com>
Fri, 19 Jun 2009 16:13:32 +0200
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Update GAE to 1.2.3 in thirdparty folder.
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""A handler that exports various App Engine services over HTTP.
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You can export this handler in your app by adding it directly to app.yaml's
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list of handlers:
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  handlers:
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  - url: /remote_api
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    script: $PYTHON_LIB/google/appengine/ext/remote_api/handler.py
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    login: admin
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Then, you can use remote_api_stub to remotely access services exported by this
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handler. See the documentation in remote_api_stub.py for details on how to do
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this.
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Using this handler without specifying "login: admin" would be extremely unwise.
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So unwise that the default handler insists on checking for itself.
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"""
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import google
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import logging
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import os
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import pickle
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import sha
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import wsgiref.handlers
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import yaml
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from google.appengine.api import api_base_pb
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from google.appengine.api import apiproxy_stub
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from google.appengine.api import apiproxy_stub_map
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from google.appengine.api import users
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from google.appengine.datastore import datastore_pb
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from google.appengine.ext import webapp
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from google.appengine.ext.remote_api import remote_api_pb
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from google.appengine.runtime import apiproxy_errors
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class RemoteDatastoreStub(apiproxy_stub.APIProxyStub):
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  """Provides a stub that permits execution of stateful datastore queries.
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  Some operations aren't possible using the standard interface. Notably,
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  datastore RunQuery operations internally store a cursor that is referenced in
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  later Next calls, and cleaned up at the end of each request. Because every
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  call to ApiCallHandler takes place in its own request, this isn't possible.
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  To work around this, RemoteDatastoreStub provides its own implementation of
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  RunQuery that immediately returns the query results.
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  """
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  def _Dynamic_RunQuery(self, request, response):
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    """Handle a RunQuery request.
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    We handle RunQuery by executing a Query and a Next and returning the result
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    of the Next request.
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    """
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    runquery_response = datastore_pb.QueryResult()
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    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'RunQuery',
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                                   request, runquery_response)
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    next_request = datastore_pb.NextRequest()
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    next_request.mutable_cursor().CopyFrom(runquery_response.cursor())
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    next_request.set_count(request.limit())
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    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'Next',
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                                   next_request, response)
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  def _Dynamic_Transaction(self, request, response):
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    """Handle a Transaction request.
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    We handle transactions by accumulating Put requests on the client end, as
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    well as recording the key and hash of Get requests. When Commit is called,
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    Transaction is invoked, which verifies that all the entities in the
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    precondition list still exist and their hashes match, then performs a
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    transaction of its own to make the updates.
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    """
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    tx = datastore_pb.Transaction()
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    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'BeginTransaction',
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                                   api_base_pb.VoidProto(), tx)
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    preconditions = request.precondition_list()
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    if preconditions:
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      get_request = datastore_pb.GetRequest()
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      get_request.mutable_transaction().CopyFrom(tx)
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      for precondition in preconditions:
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        key = get_request.add_key()
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        key.CopyFrom(precondition.key())
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      get_response = datastore_pb.GetResponse()
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      apiproxy_stub_map.MakeSyncCall('datastore_v3', 'Get', get_request,
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                                     get_response)
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      entities = get_response.entity_list()
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      assert len(entities) == request.precondition_size()
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      for precondition, entity in zip(preconditions, entities):
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   111
        if precondition.has_hash() != entity.has_entity():
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   112
          raise apiproxy_errors.ApplicationError(
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   113
              datastore_pb.Error.CONCURRENT_TRANSACTION,
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   114
              "Transaction precondition failed.")
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   115
        elif entity.has_entity():
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parents:
diff changeset
   116
          entity_hash = sha.new(entity.entity().Encode()).digest()
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   117
          if precondition.hash() != entity_hash:
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   118
            raise apiproxy_errors.ApplicationError(
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   119
                datastore_pb.Error.CONCURRENT_TRANSACTION,
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   120
                "Transaction precondition failed.")
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   121
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   122
    if request.has_puts():
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parents:
diff changeset
   123
      put_request = request.puts()
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   124
      put_request.mutable_transaction().CopyFrom(tx)
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   125
      apiproxy_stub_map.MakeSyncCall('datastore_v3', 'Put',
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   126
                                     put_request, response)
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parents:
diff changeset
   127
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parents:
diff changeset
   128
    if request.has_deletes():
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diff changeset
   129
      delete_request = request.deletes()
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parents:
diff changeset
   130
      delete_request.mutable_transaction().CopyFrom(tx)
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parents:
diff changeset
   131
      apiproxy_stub_map.MakeSyncCall('datastore_v3', 'Delete',
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parents:
diff changeset
   132
                                     delete_request, api_base_pb.VoidProto())
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parents:
diff changeset
   133
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parents:
diff changeset
   134
    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'Commit', tx,
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   135
                                   api_base_pb.VoidProto())
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   136
f5fd65cc3bf3 Load /Users/solydzajs/Downloads/google_appengine into
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parents:
diff changeset
   137
  def _Dynamic_GetIDs(self, request, response):
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parents:
diff changeset
   138
    """Fetch unique IDs for a set of paths."""
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parents:
diff changeset
   139
    for entity in request.entity_list():
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parents:
diff changeset
   140
      assert entity.property_size() == 0
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   141
      assert entity.raw_property_size() == 0
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   142
      assert entity.entity_group().element_size() == 0
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   143
      lastpart = entity.key().path().element_list()[-1]
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parents:
diff changeset
   144
      assert lastpart.id() == 0 and not lastpart.has_name()
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parents:
diff changeset
   145
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parents:
diff changeset
   146
    tx = datastore_pb.Transaction()
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parents:
diff changeset
   147
    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'BeginTransaction',
f5fd65cc3bf3 Load /Users/solydzajs/Downloads/google_appengine into
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parents:
diff changeset
   148
                                   api_base_pb.VoidProto(), tx)
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parents:
diff changeset
   149
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parents:
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   150
    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'Put', request, response)
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parents:
diff changeset
   151
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parents:
diff changeset
   152
    apiproxy_stub_map.MakeSyncCall('datastore_v3', 'Rollback', tx,
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parents:
diff changeset
   153
                                   api_base_pb.VoidProto())
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parents:
diff changeset
   154
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parents:
diff changeset
   155
f5fd65cc3bf3 Load /Users/solydzajs/Downloads/google_appengine into
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parents:
diff changeset
   156
SERVICE_PB_MAP = {
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parents:
diff changeset
   157
    'datastore_v3': {
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parents:
diff changeset
   158
        'Get': (datastore_pb.GetRequest, datastore_pb.GetResponse),
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parents:
diff changeset
   159
        'Put': (datastore_pb.PutRequest, datastore_pb.PutResponse),
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parents:
diff changeset
   160
        'Delete': (datastore_pb.DeleteRequest, datastore_pb.DeleteResponse),
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parents:
diff changeset
   161
        'Count': (datastore_pb.Query, api_base_pb.Integer64Proto),
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parents:
diff changeset
   162
        'GetIndices': (api_base_pb.StringProto, datastore_pb.CompositeIndices),
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parents:
diff changeset
   163
    },
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parents:
diff changeset
   164
    'remote_datastore': {
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parents:
diff changeset
   165
        'RunQuery': (datastore_pb.Query, datastore_pb.QueryResult),
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parents:
diff changeset
   166
        'Transaction': (remote_api_pb.TransactionRequest,
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parents:
diff changeset
   167
                             datastore_pb.PutResponse),
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parents:
diff changeset
   168
        'GetIDs': (remote_api_pb.PutRequest, datastore_pb.PutResponse),
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parents:
diff changeset
   169
    },
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parents:
diff changeset
   170
}
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parents:
diff changeset
   171
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diff changeset
   172
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   173
class ApiCallHandler(webapp.RequestHandler):
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parents:
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   174
  """A webapp handler that accepts API calls over HTTP and executes them."""
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parents:
diff changeset
   175
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   176
  LOCAL_STUBS = {
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   177
      'remote_datastore': RemoteDatastoreStub('remote_datastore'),
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   178
  }
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parents:
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   179
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   180
  def CheckIsAdmin(self):
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parents:
diff changeset
   181
    if not users.is_current_user_admin():
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   182
      self.response.set_status(401)
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parents:
diff changeset
   183
      self.response.out.write(
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parents:
diff changeset
   184
          "You must be logged in as an administrator to access this.")
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parents:
diff changeset
   185
      self.response.headers['Content-Type'] = 'text/plain'
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parents:
diff changeset
   186
      return False
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parents:
diff changeset
   187
    elif 'X-appcfg-api-version' not in self.request.headers:
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parents:
diff changeset
   188
      self.response.set_status(403)
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parents:
diff changeset
   189
      self.response.out.write("This request did not contain a necessary header")
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parents:
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   190
      return False
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parents:
diff changeset
   191
    return True
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parents:
diff changeset
   192
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parents:
diff changeset
   193
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parents:
diff changeset
   194
  def get(self):
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   195
    """Handle a GET. Just show an info page."""
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parents:
diff changeset
   196
    if not self.CheckIsAdmin():
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parents:
diff changeset
   197
      return
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parents:
diff changeset
   198
2273
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parents: 1278
diff changeset
   199
    rtok = self.request.get('rtok', '0')
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parents: 1278
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   200
    app_info = {
e4cb9c53db3e Load /Users/solydzajs/Desktop/google_appengine into
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parents: 1278
diff changeset
   201
        'app_id': os.environ['APPLICATION_ID'],
e4cb9c53db3e Load /Users/solydzajs/Desktop/google_appengine into
Pawel Solyga <Pawel.Solyga@gmail.com>
parents: 1278
diff changeset
   202
        'rtok': rtok
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parents: 1278
diff changeset
   203
        }
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parents: 1278
diff changeset
   204
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parents: 1278
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   205
    self.response.out.write(yaml.dump(app_info))
828
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parents:
diff changeset
   206
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parents:
diff changeset
   207
  def post(self):
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parents:
diff changeset
   208
    """Handle POST requests by executing the API call."""
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parents:
diff changeset
   209
    if not self.CheckIsAdmin():
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parents:
diff changeset
   210
      return
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parents:
diff changeset
   211
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parents:
diff changeset
   212
    self.response.headers['Content-Type'] = 'application/octet-stream'
f5fd65cc3bf3 Load /Users/solydzajs/Downloads/google_appengine into
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parents:
diff changeset
   213
    response = remote_api_pb.Response()
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parents:
diff changeset
   214
    try:
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
diff changeset
   215
      request = remote_api_pb.Request()
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parents:
diff changeset
   216
      request.ParseFromString(self.request.body)
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parents:
diff changeset
   217
      response_data = self.ExecuteRequest(request)
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parents:
diff changeset
   218
      response.mutable_response().set_contents(response_data.Encode())
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parents:
diff changeset
   219
      self.response.set_status(200)
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    except Exception, e:
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      logging.exception('Exception while handling %s', request)
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      self.response.set_status(200)
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      response.mutable_exception().set_contents(pickle.dumps(e))
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    self.response.out.write(response.Encode())
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  def ExecuteRequest(self, request):
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    """Executes an API invocation and returns the response object."""
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    service = request.service_name()
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    method = request.method()
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    service_methods = SERVICE_PB_MAP.get(service, {})
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    request_class, response_class = service_methods.get(method, (None, None))
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    if not request_class:
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      raise apiproxy_errors.CallNotFoundError()
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    request_data = request_class()
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    request_data.ParseFromString(request.request().contents())
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    response_data = response_class()
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    if service in self.LOCAL_STUBS:
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      self.LOCAL_STUBS[service].MakeSyncCall(service, method, request_data,
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                                             response_data)
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    else:
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      apiproxy_stub_map.MakeSyncCall(service, method, request_data,
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                                     response_data)
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    return response_data
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  def InfoPage(self):
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    """Renders an information page."""
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    return """
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html><head>
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<title>App Engine API endpoint.</title>
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</head><body>
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<h1>App Engine API endpoint.</h1>
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<p>This is an endpoint for the App Engine remote API interface.
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Point your stubs (google.appengine.ext.remote_api.remote_api_stub) here.</p>
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</body>
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</html>"""
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def main():
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  application = webapp.WSGIApplication([('.*', ApiCallHandler)])
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  wsgiref.handlers.CGIHandler().run(application)
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if __name__ == '__main__':
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  main()