text: # Copyright (C) 2020 The Android Open Source Project
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #      http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from google.protobuf import descriptor_pb2
  from google.protobuf import message_factory
  from google.protobuf.descriptor_pool import DescriptorPool
  
  from perfetto.trace_processor.platform import PlatformDelegate
  
  
  class ProtoFactory:
  
    def __init__(self, platform_delegate: PlatformDelegate):
      # Declare descriptor pool
      self.descriptor_pool = DescriptorPool()
  
      # Load trace processor descriptor and add to descriptor pool
      tp_desc = platform_delegate.get_resource('trace_processor.descriptor')
      tp_file_desc_set_pb2 = descriptor_pb2.FileDescriptorSet()
      tp_file_desc_set_pb2.MergeFromString(tp_desc)
  
      for f_desc_pb2 in tp_file_desc_set_pb2.file:
        self.descriptor_pool.Add(f_desc_pb2)
  
      # Load metrics descriptor and add to descriptor pool
      metrics_desc = platform_delegate.get_resource('metrics.descriptor')
      metrics_file_desc_set_pb2 = descriptor_pb2.FileDescriptorSet()
      metrics_file_desc_set_pb2.MergeFromString(metrics_desc)
  
      for f_desc_pb2 in metrics_file_desc_set_pb2.file:
        self.descriptor_pool.Add(f_desc_pb2)
  
      def create_message_factory(message_type):
        message_desc = self.descriptor_pool.FindMessageTypeByName(message_type)
        return message_factory.MessageFactory().GetPrototype(message_desc)
  
      # Create proto messages to correctly communicate with the RPC API by sending
      # and receiving data as protos
      self.AppendTraceDataResult = create_message_factory(
          'perfetto.protos.AppendTraceDataResult')
      self.StatusResult = create_message_factory('perfetto.protos.StatusResult')
      self.ComputeMetricArgs = create_message_factory(
          'perfetto.protos.ComputeMetricArgs')
      self.ComputeMetricResult = create_message_factory(
          'perfetto.protos.ComputeMetricResult')
      self.RawQueryArgs = create_message_factory('perfetto.protos.RawQueryArgs')
      self.QueryResult = create_message_factory('perfetto.protos.QueryResult')
      self.TraceMetrics = create_message_factory('perfetto.protos.TraceMetrics')
      self.DisableAndReadMetatraceResult = create_message_factory(
          'perfetto.protos.DisableAndReadMetatraceResult')
      self.CellsBatch = create_message_factory(
          'perfetto.protos.QueryResult.CellsBatch')
  