YugabyteDB (2.13.1.0-b60, 21121d69985fbf76aa6958d8f04a9bfa936293b5)

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// The following only applies to changes made to this file as part of YugaByte development.

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// in compliance with the License.  You may obtain a copy of the License at

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// Tool to dump tablets

#include <iostream>

#include <memory>

#include <vector>

#include <gflags/gflags.h>

#include <glog/logging.h>

#include "yb/tools/fs_tool.h"

#include "yb/util/flags.h"

#include "yb/util/logging.h"

#include "yb/util/status.h"

#include "yb/util/status_log.h"

DEFINE_int32(nrows, 0, "Number of rows to dump");

DEFINE_bool(metadata_only, false, "Whether just to dump the block metadata, "

                                  "when printing blocks.");

/*

  TODO: support specifying start and end keys

  DEFINE_string(start_key, "", "Start key for rows to dump");

  DEFINE_string(end_key, "", "Start key for rows to dump");

*/

DEFINE_bool(headers_only, false, "Don't dump contents, dump headers only");

namespace yb {

namespace tools {

using std::string;

using std::vector;

using strings::Substitute;

namespace {

enum CommandType {

  DUMP_TABLET_DATA,

  PRINT_TABLET_META,

  PRINT_UUID,

};

struct CommandHandler {

  CommandType type_;

  string name_;

  string desc_;

  CommandHandler(CommandType type, string name, string desc)

      : type_(type), name_(std::move(name)), desc_(std::move(desc)) {}

};

const vector<CommandHandler> kCommandHandlers = {

    CommandHandler(DUMP_TABLET_DATA, "dump_tablet_data",

                   "Dump a tablet's data (requires a tablet id)"),

    CommandHandler(PRINT_TABLET_META, "print_meta",

                   "Print a tablet metadata (requires a tablet id)"),

    CommandHandler(PRINT_UUID, "print_uuid",

                   "Print the UUID (master or TS) to whom the data belongs") };

void PrintUsageToStream(const std::string& prog_name, std::ostream* out) {

  *out << "Usage: " << prog_name

       << " [-headers_only] [-nrows <num rows>] "

       << "-fs_wal_dirs <dirs> -fs_data_dirs <dirs> <command> <options> "

       << std::endl << std::endl;

  *out << "Commands: " << std::endl;

  for (const CommandHandler& handler : kCommandHandlers) {

    *out << handler.name_ << ": " << handler.desc_ << std::endl;

  }

}

void Usage(const string& prog_name, const string& msg) {

  std::cerr << "Error " << prog_name << ": " << msg << std::endl;

  PrintUsageToStream(prog_name, &std::cerr);

}

bool ValidateCommand(int argc, char** argv, CommandType* out) {

  if (argc < 2) {

    Usage(argv[0], "At least one command must be specified!");

    return false;

  }

  for (const CommandHandler& handler : kCommandHandlers) {

    if (argv[1] == handler.name_) {

      *out = handler.type_;

      return true;

    }

  }

  Usage("Invalid command specified: ", argv[1]);

  return false;

}

} // anonymous namespace

static int FsDumpToolMain(int argc, char** argv) {

  FLAGS_logtostderr = 1;

  std::stringstream usage_str;

  PrintUsageToStream(argv[0], &usage_str);

  google::SetUsageMessage(usage_str.str());

  ParseCommandLineFlags(&argc, &argv, true);

  InitGoogleLoggingSafe(argv[0]);

  CommandType cmd;

  if (!ValidateCommand(argc, argv, &cmd)) {

    return 2;

  }

  FsTool fs_tool(FLAGS_headers_only ? FsTool::HEADERS_ONLY : FsTool::MAXIMUM);

  CHECK_OK(fs_tool.Init());

  DumpOptions opts;

  // opts.start_key = FLAGS_start_key;

  // opts.end_key = FLAGS_end_key;

  opts.nrows = FLAGS_nrows;

  opts.metadata_only = FLAGS_metadata_only;

  switch (cmd) {

    case DUMP_TABLET_DATA:

    {

      if (argc < 3) {

        Usage(argv[0],

              Substitute("dump_tablet requires tablet id: $0 "

                         "dump_tablet <tablet_id>",

                         argv[0]));

        return 2;

      }

      CHECK_OK(fs_tool.DumpTabletData(argv[2]));

      break;

    }

    case PRINT_TABLET_META: {

      if (argc < 3) {

        Usage(argv[0], Substitute("print_meta requires a tablet id: $0"

                                  "print_meta <tablet_id>", argv[0]));

        return 2;

      }

      CHECK_OK(fs_tool.PrintTabletMeta(argv[2], 0));

      break;

    }

    case PRINT_UUID: {

      if (argc < 2) {

        Usage(argv[0], Substitute("$0 print_uuid", argv[0]));

        return 2;

      }

      CHECK_OK(fs_tool.PrintUUID(0));

      break;

    }

  }

  return 0;

}

} // namespace tools

} // namespace yb

int main(int argc, char** argv) {

  return yb::tools::FsDumpToolMain(argc, argv);

}