github.com/jimmyx0x/go-ethereum@v1.10.28/core/rawdb/key_length_iterator_test.go (about)

     1  // Copyright 2022 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package rawdb
    18  
    19  import (
    20  	"encoding/binary"
    21  	"testing"
    22  )
    23  
    24  func TestKeyLengthIterator(t *testing.T) {
    25  	db := NewMemoryDatabase()
    26  
    27  	keyLen := 8
    28  	expectedKeys := make(map[string]struct{})
    29  	for i := 0; i < 100; i++ {
    30  		key := make([]byte, keyLen)
    31  		binary.BigEndian.PutUint64(key, uint64(i))
    32  		if err := db.Put(key, []byte{0x1}); err != nil {
    33  			t.Fatal(err)
    34  		}
    35  		expectedKeys[string(key)] = struct{}{}
    36  
    37  		longerKey := make([]byte, keyLen*2)
    38  		binary.BigEndian.PutUint64(longerKey, uint64(i))
    39  		if err := db.Put(longerKey, []byte{0x1}); err != nil {
    40  			t.Fatal(err)
    41  		}
    42  	}
    43  
    44  	it := NewKeyLengthIterator(db.NewIterator(nil, nil), keyLen)
    45  	for it.Next() {
    46  		key := it.Key()
    47  		_, exists := expectedKeys[string(key)]
    48  		if !exists {
    49  			t.Fatalf("Found unexpected key %d", binary.BigEndian.Uint64(key))
    50  		}
    51  		delete(expectedKeys, string(key))
    52  		if len(key) != keyLen {
    53  			t.Fatalf("Found unexpected key in key length iterator with length %d", len(key))
    54  		}
    55  	}
    56  
    57  	if len(expectedKeys) != 0 {
    58  		t.Fatalf("Expected all keys of length %d to be removed from expected keys during iteration", keyLen)
    59  	}
    60  }