github.com/halybang/go-ethereum@v1.0.5-0.20180325041310-3b262bc1367c/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/wanchain/go-wanchain/consensus/ethash"
    27  	"github.com/wanchain/go-wanchain/core"
    28  	"github.com/wanchain/go-wanchain/core/state"
    29  	"github.com/wanchain/go-wanchain/core/vm"
    30  	"github.com/wanchain/go-wanchain/ethdb"
    31  	"github.com/wanchain/go-wanchain/params"
    32  	"github.com/wanchain/go-wanchain/trie"
    33  )
    34  
    35  func TestNodeIterator(t *testing.T) {
    36  	var (
    37  		fulldb, _  = ethdb.NewMemDatabase()
    38  		lightdb, _ = ethdb.NewMemDatabase()
    39  		gspec      = core.DefaultPPOWTestingGenesisBlock()
    40  		genesis    = gspec.MustCommit(fulldb)
    41  	)
    42  	gspec.MustCommit(lightdb)
    43  
    44  	engine := ethash.NewFullFaker(fulldb)
    45  	blockchain, _ := core.NewBlockChain(fulldb, params.TestChainConfig, engine, vm.Config{})
    46  	chainEnv := core.NewChainEnv(params.TestChainConfig, gspec, engine, blockchain, fulldb)
    47  
    48  	gchain, _ := chainEnv.GenerateChain(genesis, 4, testChainGen)
    49  	if _, err := blockchain.InsertChain(gchain); err != nil {
    50  		panic(err)
    51  	}
    52  
    53  	ctx := context.Background()
    54  	odr := &testOdr{sdb: fulldb, ldb: lightdb}
    55  	head := blockchain.CurrentHeader()
    56  	lightTrie, _ := NewStateDatabase(ctx, head, odr).OpenTrie(head.Root)
    57  	fullTrie, _ := state.NewDatabase(fulldb).OpenTrie(head.Root)
    58  	if err := diffTries(fullTrie, lightTrie); err != nil {
    59  		t.Fatal(err)
    60  	}
    61  }
    62  
    63  func diffTries(t1, t2 state.Trie) error {
    64  	i1 := trie.NewIterator(t1.NodeIterator(nil))
    65  	i2 := trie.NewIterator(t2.NodeIterator(nil))
    66  	for i1.Next() && i2.Next() {
    67  		if !bytes.Equal(i1.Key, i2.Key) {
    68  			spew.Dump(i2)
    69  			return fmt.Errorf("tries have different keys %x, %x", i1.Key, i2.Key)
    70  		}
    71  		if !bytes.Equal(i2.Value, i2.Value) {
    72  			return fmt.Errorf("tries differ at key %x", i1.Key)
    73  		}
    74  	}
    75  	switch {
    76  	case i1.Err != nil:
    77  		return fmt.Errorf("full trie iterator error: %v", i1.Err)
    78  	case i2.Err != nil:
    79  		return fmt.Errorf("light trie iterator error: %v", i1.Err)
    80  	case i1.Next():
    81  		return fmt.Errorf("full trie iterator has more k/v pairs")
    82  	case i2.Next():
    83  		return fmt.Errorf("light trie iterator has more k/v pairs")
    84  	}
    85  	return nil
    86  }