src/trace_redaction/scrub_trace_packet.cc

/*
 * Copyright (C) 2024 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 <string>

#include "src/trace_redaction/scrub_trace_packet.h"

#include "perfetto/base/status.h"

namespace perfetto::trace_redaction {

TracePacketFilter::~TracePacketFilter() = default;

base::Status ScrubTracePacket::Transform(const Context& context,
                                         std::string* packet) const {
  if (packet == nullptr || packet->empty()) {
    return base::ErrStatus("ScrubTracePacket: null or empty packet.");
  }

  for (const auto& filter : filters_) {
    auto status = filter->VerifyContext(context);

    if (!status.ok()) {
      return status;
    }
  }

  if (KeepEvent(context, *packet)) {
    return base::OkStatus();
  }

  packet->clear();
  return base::OkStatus();
}

// Logical AND of all filters.
bool ScrubTracePacket::KeepEvent(const Context& context,
                                 const std::string& bytes) const {
  for (const auto& filter : filters_) {
    if (!filter->KeepPacket(context, bytes)) {
      return false;
    }
  }

  return true;
}

}  // namespace perfetto::trace_redaction