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// Copyright 2020 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 core
import (
"errors"
"fmt"
"testing"
"time"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/consensus/ethash"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
)
func verifyUnbrokenCanonchain(hc *HeaderChain) error {
h := hc.CurrentHeader()
for {
canonHash := rawdb.ReadCanonicalHash(hc.chainDb, h.Number.Uint64())
if exp := h.Hash(); canonHash != exp {
return fmt.Errorf("Canon hash chain broken, block %d got %x, expected %x",
h.Number, canonHash[:8], exp[:8])
}
// Verify that we have the TD
if td := rawdb.ReadTd(hc.chainDb, canonHash, h.Number.Uint64()); td == nil {
return fmt.Errorf("Canon TD missing at block %d", h.Number)
}
if h.Number.Uint64() == 0 {
break
}
h = hc.GetHeader(h.ParentHash, h.Number.Uint64()-1)
}
return nil
}
func testInsert(t *testing.T, hc *HeaderChain, chain []*types.Header, wantStatus WriteStatus, wantErr error) {
t.Helper()
status, err := hc.InsertHeaderChain(chain, time.Now())
if status != wantStatus {
t.Errorf("wrong write status from InsertHeaderChain: got %v, want %v", status, wantStatus)
}
// Always verify that the header chain is unbroken
if err := verifyUnbrokenCanonchain(hc); err != nil {
t.Fatal(err)
}
if !errors.Is(err, wantErr) {
t.Fatalf("unexpected error from InsertHeaderChain: %v", err)
}
}
// This test checks status reporting of InsertHeaderChain.
func TestHeaderInsertion(t *testing.T) {
var (
db = rawdb.NewMemoryDatabase()
genesis = new(Genesis).MustCommit(db)
)
hc, err := NewHeaderChain(db, params.AllEthashProtocolChanges, ethash.NewFaker(), func() bool { return false })
if err != nil {
t.Fatal(err)
}
// chain A: G->A1->A2...A128
chainA := makeHeaderChain(genesis.Header(), 128, ethash.NewFaker(), db, 10)
// chain B: G->A1->B2...B128
chainB := makeHeaderChain(chainA[0], 128, ethash.NewFaker(), db, 10)
log.Root().SetHandler(log.StdoutHandler)
// Inserting 64 headers on an empty chain, expecting
// 1 callbacks, 1 canon-status, 0 sidestatus,
testInsert(t, hc, chainA[:64], CanonStatTy, nil)
// Inserting 64 identical headers, expecting
// 0 callbacks, 0 canon-status, 0 sidestatus,
testInsert(t, hc, chainA[:64], NonStatTy, nil)
// Inserting the same some old, some new headers
// 1 callbacks, 1 canon, 0 side
testInsert(t, hc, chainA[32:96], CanonStatTy, nil)
// Inserting side blocks, but not overtaking the canon chain
testInsert(t, hc, chainB[0:32], SideStatTy, nil)
// Inserting more side blocks, but we don't have the parent
testInsert(t, hc, chainB[34:36], NonStatTy, consensus.ErrUnknownAncestor)
// Inserting more sideblocks, overtaking the canon chain
testInsert(t, hc, chainB[32:97], CanonStatTy, nil)
// Inserting more A-headers, taking back the canonicality
testInsert(t, hc, chainA[90:100], CanonStatTy, nil)
// And B becomes canon again
testInsert(t, hc, chainB[97:107], CanonStatTy, nil)
// And B becomes even longer
testInsert(t, hc, chainB[107:128], CanonStatTy, nil)
}