Function DumpTable

src/leveldb/db/dumpfile.cc:147–210

}

Status DumpTable(Env* env, const std::string& fname, WritableFile* dst) {
  uint64_t file_size;
  RandomAccessFile* file = nullptr;
  Table* table = nullptr;
  Status s = env->GetFileSize(fname, &file_size);
  if (s.ok()) {
    s = env->NewRandomAccessFile(fname, &file);
  }
  if (s.ok()) {
    // We use the default comparator, which may or may not match the
    // comparator used in this database. However this should not cause
    // problems since we only use Table operations that do not require
    // any comparisons.  In particular, we do not call Seek or Prev.
    s = Table::Open(Options(), file, file_size, &table);
  }
  if (!s.ok()) {
    delete table;
    delete file;
    return s;
  }

  ReadOptions ro;
  ro.fill_cache = false;
  Iterator* iter = table->NewIterator(ro);
  std::string r;
  for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
    r.clear();
    ParsedInternalKey key;
    if (!ParseInternalKey(iter->key(), &key)) {
      r = "badkey '";
      AppendEscapedStringTo(&r, iter->key());
      r += "' => '";
      AppendEscapedStringTo(&r, iter->value());
      r += "'\n";
      dst->Append(r);
    } else {
      r = "'";
      AppendEscapedStringTo(&r, key.user_key);
      r += "' @ ";
      AppendNumberTo(&r, key.sequence);
      r += " : ";
      if (key.type == kTypeDeletion) {
        r += "del";
      } else if (key.type == kTypeValue) {
        r += "val";
      } else {
        AppendNumberTo(&r, key.type);
      }
      r += " => '";
      AppendEscapedStringTo(&r, iter->value());
      r += "'\n";
      dst->Append(r);
    }
  }
  s = iter->status();
  if (!s.ok()) {
    dst->Append("iterator error: " + s.ToString() + "\n");
  }