// 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 core
import (
"context"
"fmt"
"math/big"
"math/rand"
"testing"
"time"
"github.com/dexon-foundation/dexon/common"
"github.com/dexon-foundation/dexon/core/rawdb"
"github.com/dexon-foundation/dexon/core/types"
"github.com/dexon-foundation/dexon/ethdb"
)
// Runs multiple tests with randomized parameters.
func TestChainIndexerSingle(t *testing.T) {
for i := 0; i < 10; i++ {
testChainIndexer(t, 1)
}
}
// Runs multiple tests with randomized parameters and different number of
// chain backends.
func TestChainIndexerWithChildren(t *testing.T) {
for i := 2; i < 8; i++ {
testChainIndexer(t, i)
}
}
// testChainIndexer runs a test with either a single chain indexer or a chain of
// multiple backends. The section size and required confirmation count parameters
// are randomized.
func testChainIndexer(t *testing.T, count int) {
db := ethdb.NewMemDatabase()
defer db.Close()
// Create a chain of indexers and ensure they all report empty
backends := make([]*testChainIndexBackend, count)
for i := 0; i < count; i++ {
var (
sectionSize = uint64(rand.Intn(100) + 1)
confirmsReq = uint64(rand.Intn(10))
)
backends[i] = &testChainIndexBackend{t: t, processCh: make(chan uint64)}
backends[i].indexer = NewChainIndexer(db, ethdb.NewTable(db, string([]byte{byte(i)})), backends[i], sectionSize, confirmsReq, 0, fmt.Sprintf("indexer-%d", i))
if sections, _, _ := backends[i].indexer.Sections(); sections != 0 {
t.Fatalf("Canonical section count mismatch: have %v, want %v", sections, 0)
}
if i > 0 {
backends[i-1].indexer.AddChildIndexer(backends[i].indexer)
}
}
defer backends[0].indexer.Close() // parent indexer shuts down children
// notify pings the root indexer about a new head or reorg, then expect
// processed blocks if a section is processable
notify := func(headNum, failNum uint64, reorg bool) {
backends[0].indexer.newHead(headNum, reorg)
if reorg {
for _, backend := range backends {
headNum = backend.reorg(headNum)
backend.assertSections()
}
return
}
var cascade bool
for _, backend := range backends {
headNum, cascade = backend.assertBlocks(headNum, failNum)
if !cascade {
break
}
backend.assertSections()
}
}
// inject inserts a new random canonical header into the database directly
inject := func(number uint64) {
header := &types.Header{Number: big.NewInt(int64(number)), Extra: big.NewInt(rand.Int63()).Bytes()}
if number > 0 {
header.ParentHash = rawdb.ReadCanonicalHash(db, number-1)
}
rawdb.WriteHeader(db, header)
rawdb.WriteCanonicalHash(db, header.Hash(), number)
}
// Start indexer with an already existing chain
for i := uint64(0); i <= 100; i++ {
inject(i)
}
notify(100, 100, false)
// Add new blocks one by one
for i := uint64(101); i <= 1000; i++ {
inject(i)
notify(i, i, false)
}
// Do a reorg
notify(500, 500, true)
// Create new fork
for i := uint64(501); i <= 1000; i++ {
inject(i)
notify(i, i, false)
}
for i := uint64(1001); i <= 1500; i++ {
inject(i)
}
// Failed processing scenario where less blocks are available than notified
notify(2000, 1500, false)
// Notify about a reorg (which could have caused the missing blocks if happened during processing)
notify(1500, 1500, true)
// Create new fork
for i := uint64(1501); i <= 2000; i++ {
inject(i)
notify(i, i, false)
}
}
// testChainIndexBackend implements ChainIndexerBackend
type testChainIndexBackend struct {
t *testing.T
indexer *ChainIndexer
section, headerCnt, stored uint64
processCh chan uint64
}
// assertSections verifies if a chain indexer has the correct number of section.
func (b *testChainIndexBackend) assertSections() {
// Keep trying for 3 seconds if it does not match
var sections uint64
for i := 0; i < 300; i++ {
sections, _, _ = b.indexer.Sections()
if sections == b.stored {
return
}
time.Sleep(10 * time.Millisecond)
}
b.t.Fatalf("Canonical section count mismatch: have %v, want %v", sections, b.stored)
}
// assertBlocks expects processing calls after new blocks have arrived. If the
// failNum < headNum then we are simulating a scenario where a reorg has happened
// after the processing has started and the processing of a section fails.
func (b *testChainIndexBackend) assertBlocks(headNum, failNum uint64) (uint64, bool) {
var sections uint64
if headNum >= b.indexer.confirmsReq {
sections = (headNum + 1 - b.indexer.confirmsReq) / b.indexer.sectionSize
if sections > b.stored {
// expect processed blocks
for expectd := b.stored * b.indexer.sectionSize; expectd < sections*b.indexer.sectionSize; expectd++ {
if expectd > failNum {
// rolled back after processing started, no more process calls expected
// wait until updating is done to make sure that processing actually fails
var updating bool
for i := 0; i < 300; i++ {
b.indexer.lock.Lock()
updating = b.indexer.knownSections > b.indexer.storedSections
b.indexer.lock.Unlock()
if !updating {
break
}
time.Sleep(10 * time.Millisecond)
}
if updating {
b.t.Fatalf("update did not finish")
}
sections = expectd / b.indexer.sectionSize
break
}
select {
case <-time.After(10 * time.Second):
b.t.Fatalf("Expected processed block #%d, got nothing", expectd)
case processed := <-b.processCh:
if processed != expectd {
b.t.Errorf("Expected processed block #%d, got #%d", expectd, processed)
}
}
}
b.stored = sections
}
}
if b.stored == 0 {
return 0, false
}
return b.stored*b.indexer.sectionSize - 1, true
}
func (b *testChainIndexBackend) reorg(headNum uint64) uint64 {
firstChanged := headNum / b.indexer.sectionSize
if firstChanged < b.stored {
b.stored = firstChanged
}
return b.stored * b.indexer.sectionSize
}
func (b *testChainIndexBackend) Reset(ctx context.Context, section uint64, prevHead common.Hash) error {
b.section = section
b.headerCnt = 0
return nil
}
func (b *testChainIndexBackend) Process(ctx context.Context, header *types.Header) error {
b.headerCnt++
if b.headerCnt > b.indexer.sectionSize {
b.t.Error("Processing too many headers")
}
//t.processCh <- header.Number.Uint64()
select {
case <-time.After(10 * time.Second):
b.t.Fatal("Unexpected call to Process")
case b.processCh <- header.Number.Uint64():
}
return nil
}
func (b *testChainIndexBackend) Commit() error {
if b.headerCnt != b.indexer.sectionSize {
b.t.Error("Not enough headers processed")
}
return nil
}
