text: //  Copyright (c) 2013, Facebook, Inc.  All rights reserved.
  //  This source code is licensed under the BSD-style license found in the
  //  LICENSE file in the root directory of this source tree. An additional grant
  //  of patent rights can be found in the PATENTS file in the same directory.
  //
  #include "rocksdb/ldb_tool.h"
  #include "util/ldb_cmd.h"
  
  namespace rocksdb {
  
  class LDBCommandRunner {
  public:
  
    static void PrintHelp(const char* exec_name) {
      string ret;
  
      ret.append("ldb - LevelDB Tool");
      ret.append("\n\n");
      ret.append("commands MUST specify --" + LDBCommand::ARG_DB +
          "=<full_path_to_db_directory> when necessary\n");
      ret.append("\n");
      ret.append("The following optional parameters control if keys/values are "
          "input/output as hex or as plain strings:\n");
      ret.append("  --" + LDBCommand::ARG_KEY_HEX +
          " : Keys are input/output as hex\n");
      ret.append("  --" + LDBCommand::ARG_VALUE_HEX +
          " : Values are input/output as hex\n");
      ret.append("  --" + LDBCommand::ARG_HEX +
          " : Both keys and values are input/output as hex\n");
      ret.append("\n");
  
      ret.append("The following optional parameters control the database "
          "internals:\n");
      ret.append("  --" + LDBCommand::ARG_TTL +
          " with 'put','get','scan','dump','query','batchput'"
          " : DB supports ttl and value is internally timestamp-suffixed\n");
      ret.append("  --" + LDBCommand::ARG_BLOOM_BITS + "=<int,e.g.:14>\n");
      ret.append("  --" + LDBCommand::ARG_COMPRESSION_TYPE +
          "=<no|snappy|zlib|bzip2>\n");
      ret.append("  --" + LDBCommand::ARG_BLOCK_SIZE +
          "=<block_size_in_bytes>\n");
      ret.append("  --" + LDBCommand::ARG_AUTO_COMPACTION + "=<true|false>\n");
      ret.append("  --" + LDBCommand::ARG_WRITE_BUFFER_SIZE +
          "=<int,e.g.:4194304>\n");
      ret.append("  --" + LDBCommand::ARG_FILE_SIZE + "=<int,e.g.:2097152>\n");
  
      ret.append("\n\n");
      ret.append("Data Access Commands:\n");
      PutCommand::Help(ret);
      GetCommand::Help(ret);
      BatchPutCommand::Help(ret);
      ScanCommand::Help(ret);
      DeleteCommand::Help(ret);
      DBQuerierCommand::Help(ret);
      ApproxSizeCommand::Help(ret);
  
      ret.append("\n\n");
      ret.append("Admin Commands:\n");
      WALDumperCommand::Help(ret);
      CompactorCommand::Help(ret);
      ReduceDBLevelsCommand::Help(ret);
      ChangeCompactionStyleCommand::Help(ret);
      DBDumperCommand::Help(ret);
      DBLoaderCommand::Help(ret);
      ManifestDumpCommand::Help(ret);
      InternalDumpCommand::Help(ret);
  
      fprintf(stderr, "%s\n", ret.c_str());
    }
  
    static void RunCommand(int argc, char** argv, Options options) {
      if (argc <= 2) {
        PrintHelp(argv[0]);
        exit(1);
      }
  
      LDBCommand* cmdObj = LDBCommand::InitFromCmdLineArgs(argc, argv, options);
      if (cmdObj == nullptr) {
        fprintf(stderr, "Unknown command\n");
        PrintHelp(argv[0]);
        exit(1);
      }
  
      if (!cmdObj->ValidateCmdLineOptions()) {
        exit(1);
      }
  
      cmdObj->Run();
      LDBCommandExecuteResult ret = cmdObj->GetExecuteState();
      fprintf(stderr, "%s\n", ret.ToString().c_str());
      delete cmdObj;
  
      exit(ret.IsFailed());
    }
  
  };
  
  
  void LDBTool::Run(int argc, char** argv, Options options) {
    LDBCommandRunner::RunCommand(argc, argv, options);
  }
  } // namespace rocksdb
  
  