/*
 * 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.
 */

// Use proto3 syntax as an optimization. The difference is that proto2 stores
// unknown fields seen while decoding in an internal buffer (std::string) while
// proto3 completely drops them. Since during validation we only need to check
// for the presence of the trusted fields below, we can use proto3 as a way to
// speed up this process.
//
// See https://developers.google.com/protocol-buffers/docs/proto3#unknowns and
// https://android-review.googlesource.com/c/platform/external/perfetto/+/
// 591673#17 for details.
syntax = "proto3";
option optimize_for = LITE_RUNTIME;

import "perfetto/common/trace_stats.proto";
import "perfetto/config/trace_config.proto";
import "perfetto/trace/clock_snapshot.proto";

package perfetto.protos;

// This proto contains trusted fields of TracePacket which may only be generated
// by the service (as opposed to the untrusted producers). Note that the field
// ids here must be kept in sync with TracePacket.
// This protobuf serves two purposes:
// 1. Security validation of packets (see trace_packet_validator.cc)
// 2. Avoid bloating the service binary with symbols for all possible trace
//    protos. The service doesn't really care about all the protos in the trace,
//    is just passes them through.
message TrustedPacket {
  // User id of the producer which generated this packet.
  // The oneof boilerplate here is required to tell the difference between
  // uid == 0 and uid not set (the writer uses proto2).
  oneof optional_trusted_uid { int32 trusted_uid = 3; };

  ClockSnapshot clock_snapshot = 6;
  TraceConfig trace_config = 33;
  TraceStats trace_stats = 35;
  bytes synchronization_marker = 36;
}
