github.com/eliasnaur/go-ethereum@v1.6.8-0.20170717120422-6e13bd050756/light/trie_test.go (about)

     1  // Copyright 2017 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 light
    18  
    19  import (
    20  	"bytes"
    21  	"context"
    22  	"fmt"
    23  	"testing"
    24  
    25  	"github.com/davecgh/go-spew/spew"
    26  	"github.com/ethereum/go-ethereum/consensus/ethash"
    27  	"github.com/ethereum/go-ethereum/core"
    28  	"github.com/ethereum/go-ethereum/core/state"
    29  	"github.com/ethereum/go-ethereum/core/vm"
    30  	"github.com/ethereum/go-ethereum/ethdb"
    31  	"github.com/ethereum/go-ethereum/event"
    32  	"github.com/ethereum/go-ethereum/params"
    33  	"github.com/ethereum/go-ethereum/trie"
    34  )
    35  
    36  func TestNodeIterator(t *testing.T) {
    37  	var (
    38  		fulldb, _  = ethdb.NewMemDatabase()
    39  		lightdb, _ = ethdb.NewMemDatabase()
    40  		gspec      = core.Genesis{Alloc: core.GenesisAlloc{testBankAddress: {Balance: testBankFunds}}}
    41  		genesis    = gspec.MustCommit(fulldb)
    42  	)
    43  	gspec.MustCommit(lightdb)
    44  	blockchain, _ := core.NewBlockChain(fulldb, params.TestChainConfig, ethash.NewFullFaker(), new(event.TypeMux), vm.Config{})
    45  	gchain, _ := core.GenerateChain(params.TestChainConfig, genesis, fulldb, 4, testChainGen)
    46  	if _, err := blockchain.InsertChain(gchain); err != nil {
    47  		panic(err)
    48  	}
    49  
    50  	ctx := context.Background()
    51  	odr := &testOdr{sdb: fulldb, ldb: lightdb}
    52  	head := blockchain.CurrentHeader()
    53  	lightTrie, _ := NewStateDatabase(ctx, head, odr).OpenTrie(head.Root)
    54  	fullTrie, _ := state.NewDatabase(fulldb).OpenTrie(head.Root)
    55  	if err := diffTries(fullTrie, lightTrie); err != nil {
    56  		t.Fatal(err)
    57  	}
    58  }
    59  
    60  func diffTries(t1, t2 state.Trie) error {
    61  	i1 := trie.NewIterator(t1.NodeIterator(nil))
    62  	i2 := trie.NewIterator(t2.NodeIterator(nil))
    63  	for i1.Next() && i2.Next() {
    64  		if !bytes.Equal(i1.Key, i2.Key) {
    65  			spew.Dump(i2)
    66  			return fmt.Errorf("tries have different keys %x, %x", i1.Key, i2.Key)
    67  		}
    68  		if !bytes.Equal(i2.Value, i2.Value) {
    69  			return fmt.Errorf("tries differ at key %x", i1.Key)
    70  		}
    71  	}
    72  	switch {
    73  	case i1.Err != nil:
    74  		return fmt.Errorf("full trie iterator error: %v", i1.Err)
    75  	case i2.Err != nil:
    76  		return fmt.Errorf("light trie iterator error: %v", i1.Err)
    77  	case i1.Next():
    78  		return fmt.Errorf("full trie iterator has more k/v pairs")
    79  	case i2.Next():
    80  		return fmt.Errorf("light trie iterator has more k/v pairs")
    81  	}
    82  	return nil
    83  }