path: root/light/trie_test.go

// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package light

import (
    "bytes"
    "context"
    "fmt"
    "testing"

    "github.com/davecgh/go-spew/spew"
    "github.com/ethereum/go-ethereum/consensus/ethash"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/params"
    "github.com/ethereum/go-ethereum/trie"
)

func TestNodeIterator(t *testing.T) {
    var (
        fulldb  = ethdb.NewMemDatabase()
        lightdb = ethdb.NewMemDatabase()
        gspec   = core.Genesis{Alloc: core.GenesisAlloc{testBankAddress: {Balance: testBankFunds}}}
        genesis = gspec.MustCommit(fulldb)
    )
    gspec.MustCommit(lightdb)
    blockchain, _ := core.NewBlockChain(fulldb, nil, params.TestChainConfig, ethash.NewFullFaker(), vm.Config{})
    gchain, _ := core.GenerateChain(params.TestChainConfig, genesis, ethash.NewFaker(), fulldb, 4, testChainGen)
    if _, err := blockchain.InsertChain(gchain); err != nil {
        panic(err)
    }

    ctx := context.Background()
    odr := &testOdr{sdb: fulldb, ldb: lightdb}
    head := blockchain.CurrentHeader()
    lightTrie, _ := NewStateDatabase(ctx, head, odr).OpenTrie(head.Root)
    fullTrie, _ := state.NewDatabase(fulldb).OpenTrie(head.Root)
    if err := diffTries(fullTrie, lightTrie); err != nil {
        t.Fatal(err)
    }
}

func diffTries(t1, t2 state.Trie) error {
    i1 := trie.NewIterator(t1.NodeIterator(nil))
    i2 := trie.NewIterator(t2.NodeIterator(nil))
    for i1.Next() && i2.Next() {
        if !bytes.Equal(i1.Key, i2.Key) {
            spew.Dump(i2)
            return fmt.Errorf("tries have different keys %x, %x", i1.Key, i2.Key)
        }
        if !bytes.Equal(i2.Value, i2.Value) {
            return fmt.Errorf("tries differ at key %x", i1.Key)
        }
    }
    switch {
    case i1.Err != nil:
        return fmt.Errorf("full trie iterator error: %v", i1.Err)
    case i2.Err != nil:
        return fmt.Errorf("light trie iterator error: %v", i1.Err)
    case i1.Next():
        return fmt.Errorf("full trie iterator has more k/v pairs")
    case i2.Next():
        return fmt.Errorf("light trie iterator has more k/v pairs")
    }
    return nil
}