aos/events/logging/log_edit.cc

#include <iostream>

#include "aos/configuration.h"
#include "aos/events/logging/logger.h"
#include "aos/events/simulated_event_loop.h"
#include "aos/init.h"
#include "aos/json_to_flatbuffer.h"
#include "aos/util/file.h"
#include "gflags/gflags.h"

DEFINE_string(logfile, "/tmp/logfile.bfbs",
              "Name of the logfile to read from.");
DEFINE_bool(
    replace, false,
    "If true, replace the header on the log file with the JSON header.");
DEFINE_string(
    header, "",
    "If provided, this is the path to the JSON with the log file header.");

int main(int argc, char **argv) {
  gflags::SetUsageMessage(R"(This tool lets us manipulate log files.)");
  aos::InitGoogle(&argc, &argv);

  if (!FLAGS_header.empty()) {
    if (FLAGS_replace) {
      const ::std::string header_json =
          aos::util::ReadFileToStringOrDie(FLAGS_header);
      flatbuffers::FlatBufferBuilder fbb;
      fbb.ForceDefaults(true);
      flatbuffers::Offset<aos::logger::LogFileHeader> header =
          aos::JsonToFlatbuffer<aos::logger::LogFileHeader>(header_json, &fbb);

      fbb.FinishSizePrefixed(header);

      const std::string orig_path = FLAGS_logfile + ".orig";
      PCHECK(rename(FLAGS_logfile.c_str(), orig_path.c_str()) == 0);

      aos::logger::SpanReader span_reader(orig_path);
      CHECK(!span_reader.ReadMessage().empty()) << ": Empty header, aborting";

      aos::logger::DetachedBufferWriter buffer_writer(
          FLAGS_logfile, std::make_unique<aos::logger::DummyEncoder>());
      buffer_writer.QueueSizedFlatbuffer(&fbb);

      while (true) {
        absl::Span<const uint8_t> msg_data = span_reader.ReadMessage();
        if (msg_data == absl::Span<const uint8_t>()) {
          break;
        }

        buffer_writer.QueueSpan(msg_data);
      }
    } else {
      aos::logger::MessageReader reader(FLAGS_logfile);
      aos::util::WriteStringToFileOrDie(
          FLAGS_header, aos::FlatbufferToJson(reader.log_file_header(),
                                              {.multi_line = true}));
    }
  }

  return 0;
}