tools/trace_to_text/trace_to_text.cc

/*
 * Copyright (C) 2018 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.
 */

#include "tools/trace_to_text/trace_to_text.h"

#include <google/protobuf/compiler/importer.h>
#include <google/protobuf/dynamic_message.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/text_format.h>

#include "perfetto/base/logging.h"
#include "tools/trace_to_text/proto_full_utils.h"

namespace perfetto {
namespace trace_to_text {

namespace {
using google::protobuf::Descriptor;
using google::protobuf::DynamicMessageFactory;
using google::protobuf::FileDescriptor;
using google::protobuf::Message;
using google::protobuf::TextFormat;
using google::protobuf::compiler::DiskSourceTree;
using google::protobuf::compiler::Importer;
using google::protobuf::io::OstreamOutputStream;

}  // namespace

int TraceToText(std::istream* input, std::ostream* output) {
  DiskSourceTree dst;
  dst.MapPath("perfetto", "protos/perfetto");
  MultiFileErrorCollectorImpl mfe;
  Importer importer(&dst, &mfe);
  const FileDescriptor* parsed_file =
      importer.Import("perfetto/trace/trace.proto");

  DynamicMessageFactory dmf;
  const Descriptor* trace_descriptor = parsed_file->message_type(0);
  const Message* msg_root = dmf.GetPrototype(trace_descriptor);
  Message* msg = msg_root->New();

  if (!msg->ParseFromIstream(input)) {
    PERFETTO_ELOG("Could not parse input.");
    return 1;
  }
  OstreamOutputStream zero_copy_output(output);
  TextFormat::Print(*msg, &zero_copy_output);
  return 0;
}

}  // namespace trace_to_text
}  // namespace perfetto