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core: polish chain indexer a bit

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This commit is contained in:
Péter Szilágyi 2017-08-03 18:25:06 +02:00
parent bd74882d83
commit 8edaaa227d
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2 changed files with 429 additions and 328 deletions
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488
core/chain_indexer.go
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@ -14,261 +14,361 @@
// You should have received a copy of the GNU Lesser General Public License // 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/>. // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package core implements the Ethereum consensus protocol.
package core package core
import ( import (
"encoding/binary" "encoding/binary"
"fmt"
"sync" "sync"
"sync/atomic"
"time" "time"
"github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types" "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethdb" "github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event" "github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/log"
) )
// ChainIndexer does a post-processing job for equally sized sections of the canonical // ChainIndexerBackend defines the methods needed to process chain segments in
// chain (like BlooomBits and CHT structures). A ChainIndexer is connected to the blockchain // the background and write the segment results into the database. These can be
// through the event system by starting a ChainEventLoop in a goroutine. // used to create filter blooms or CHTs.
// Further child ChainIndexers can be added which use the output of the parent section
// indexer. These child indexers receive new head notifications only after an entire section
// has been finished or in case of rollbacks that might affect already finished sections.
type ChainIndexer struct {
chainDb, indexDb ethdb.Database
backend ChainIndexerBackend
sectionSize, confirmReq uint64
stop chan struct{}
lock sync.Mutex
procWait time.Duration
tryUpdate chan struct{}
stored, targetCount, calcIdx, lastForwarded uint64
updating bool
children []*ChainIndexer
}
// ChainIndexerBackend interface is a backend for the indexer doing the actual post-processing job
type ChainIndexerBackend interface { type ChainIndexerBackend interface {
Reset(section uint64) // start processing a new section // Reset initiates the processing of a new chain segment, potentially terminating
Process(header *types.Header) // process a single block (called for each block in the section) // any partially completed operations (in case of a reorg).
Commit(db ethdb.Database) error // do some more processing if necessary and store the results in the database Reset(section uint64)
UpdateMsg(done, all uint64) // print a progress update message if necessary (only called when multiple sections need to be processed)
// Process crunches through the next header in the chain segment. The caller
// will ensure a sequential order of headers.
Process(header *types.Header)
// Commit finalizes the section metadata and stores it into the database. This
// interface will usually be a batch writer.
Commit(db ethdb.Database) error
} }
// NewChainIndexer creates a new ChainIndexer // ChainIndexer does a post-processing job for equally sized sections of the
// db: database where the index of available processed sections is stored (the index is stored by the // canonical chain (like BlooomBits and CHT structures). A ChainIndexer is
// indexer, the actual processed chain data is stored by the backend) // connected to the blockchain through the event system by starting a
// dbKey: key prefix where the index is stored // ChainEventLoop in a goroutine.
// backend: an implementation of ChainIndexerBackend //
// sectionSize: the size of processable sections // Further child ChainIndexers can be added which use the output of the parent
// confirmReq: required number of confirmation blocks before a new section is being processed // section indexer. These child indexers receive new head notifications only
// procWait: waiting time between processing sections (simple way of limiting the resource usage of a db upgrade) // after an entire section has been finished or in case of rollbacks that might
// stop: quit channel // affect already finished sections.
func NewChainIndexer(chainDb, indexDb ethdb.Database, backend ChainIndexerBackend, sectionSize, confirmReq uint64, procWait time.Duration, stop chan struct{}) *ChainIndexer { type ChainIndexer struct {
chainDb ethdb.Database // Chain database to index the data from
indexDb ethdb.Database // Prefixed table-view of the db to write index metadata into
backend ChainIndexerBackend // Background processor generating the index data content
children []*ChainIndexer // Child indexers to cascade chain updates to
active uint32 // Flag whether the event loop was started
update chan struct{} // Notification channel that headers should be processed
quit chan chan error // Quit channel to tear down running goroutines
sectionSize uint64 // Number of blocks in a single chain segment to process
confirmsReq uint64 // Number of confirmations before processing a completed segment
storedSections uint64 // Number of sections successfully indexed into the database
knownSections uint64 // Number of sections known to be complete (block wise)
cascadedHead uint64 // Block number of the last completed section cascaded to subindexers
throttling time.Duration // Disk throttling to prevent a heavy upgrade from hogging resources
log log.Logger
lock sync.RWMutex
}
// NewChainIndexer creates a new chain indexer to do background processing on
// chain segments of a given size after certain number of confirmations passed.
// The throttling parameter might be used to prevent database thrashing.
func NewChainIndexer(chainDb, indexDb ethdb.Database, backend ChainIndexerBackend, section, confirm uint64, throttling time.Duration, kind string) *ChainIndexer {
c := &ChainIndexer{ c := &ChainIndexer{
chainDb: chainDb, chainDb: chainDb,
indexDb: indexDb, indexDb: indexDb,
backend: backend, backend: backend,
sectionSize: sectionSize, update: make(chan struct{}, 1),
confirmReq: confirmReq, quit: make(chan chan error),
tryUpdate: make(chan struct{}, 1), sectionSize: section,
stop: stop, confirmsReq: confirm,
procWait: procWait, throttling: throttling,
log: log.New("type", kind),
} }
c.stored = c.getValidSections() // Initialize database dependent fields and start the updater
c.loadValidSections()
go c.updateLoop() go c.updateLoop()
return c return c
} }
// updateLoop is the main event loop of the indexer // Start creates a goroutine to feed chain head events into the indexer for
// cascading background processing.
func (c *ChainIndexer) Start(currentHeader *types.Header, eventMux *event.TypeMux) {
go c.eventLoop(currentHeader, eventMux)
}
// Close tears down all goroutines belonging to the indexer and returns any error
// that might have occurred internally.
func (c *ChainIndexer) Close() error {
var errs []error
// Tear down the primary update loop
errc := make(chan error)
c.quit <- errc
if err := <-errc; err != nil {
errs = append(errs, err)
}
// If needed, tear down the secondary event loop
if atomic.LoadUint32(&c.active) != 0 {
c.quit <- errc
if err := <-errc; err != nil {
errs = append(errs, err)
}
}
// Return any failures
switch {
case len(errs) == 0:
return nil
case len(errs) == 1:
return errs[0]
default:
return fmt.Errorf("%v", errs)
}
}
// eventLoop is a secondary - optional - event loop of the indexer which is only
// started for the outermost indexer to push chain head events into a processing
// queue.
func (c *ChainIndexer) eventLoop(currentHeader *types.Header, eventMux *event.TypeMux) {
// Mark the chain indexer as active, requiring an additional teardown
atomic.StoreUint32(&c.active, 1)
// Subscribe to chain head events
sub := eventMux.Subscribe(ChainEvent{})
defer sub.Unsubscribe()
// Fire the initial new head event to start any outstanding processing
c.newHead(currentHeader.Number.Uint64(), false)
var (
prevHeader = currentHeader
prevHash = currentHeader.Hash()
)
for {
select {
case errc := <-c.quit:
// Chain indexer terminating, report no failure and abort
errc <- nil
return
case ev, ok := <-sub.Chan():
// Received a new event, ensure it's not nil (closing) and update
if !ok {
errc := <-c.quit
errc <- nil
return
}
header := ev.Data.(ChainEvent).Block.Header()
if header.ParentHash != prevHash {
c.newHead(FindCommonAncestor(c.chainDb, prevHeader, header).Number.Uint64(), true)
}
c.newHead(header.Number.Uint64(), false)
prevHeader, prevHash = header, header.Hash()
}
}
}
// newHead notifies the indexer about new chain heads and/or reorgs.
func (c *ChainIndexer) newHead(head uint64, reorg bool) {
c.lock.Lock()
defer c.lock.Unlock()
// If a reorg happened, invalidate all sections until that point
if reorg {
// Revert the known section number to the reorg point
changed := head / c.sectionSize
if changed < c.knownSections {
c.knownSections = changed
}
// Revert the stored sections from the database to the reorg point
if changed < c.storedSections {
c.setValidSections(changed)
}
// Update the new head number to te finalized section end and notify children
head = changed * c.sectionSize
if head < c.cascadedHead {
c.cascadedHead = head
for _, child := range c.children {
child.newHead(c.cascadedHead, true)
}
}
return
}
// No reorg, calculate the number of newly known sections and update if high enough
var sections uint64
if head >= c.confirmsReq {
sections = (head + 1 - c.confirmsReq) / c.sectionSize
if sections > c.knownSections {
c.knownSections = sections
select {
case c.update <- struct{}{}:
default:
}
}
}
}
// updateLoop is the main event loop of the indexer which pushes chain segments
// down into the processing backend.
func (c *ChainIndexer) updateLoop() { func (c *ChainIndexer) updateLoop() {
updateMsg := false var updated time.Time
for { for {
select { select {
case <-c.stop: case errc := <-c.quit:
// Chain indexer terminating, report no failure and abort
errc <- nil
return return
case <-c.tryUpdate:
case <-c.update:
// Section headers completed (or rolled back), update the index
c.lock.Lock() c.lock.Lock()
if c.targetCount > c.stored { if c.knownSections > c.storedSections {
if !updateMsg && c.targetCount > c.stored+1 { // Periodically print an upgrade log message to the user
updateMsg = true if time.Since(updated) > 8*time.Second {
c.backend.UpdateMsg(c.stored, c.targetCount) if c.knownSections > c.storedSections+1 {
c.log.Info("Upgrading chain index", "percentage", c.storedSections*100/c.knownSections)
}
updated = time.Now()
} }
c.calcIdx = c.stored // Cache the current section count and head to allow unlocking the mutex
section := c.storedSections
var lastSectionHead common.Hash var oldHead common.Hash
if c.calcIdx > 0 { if section > 0 {
lastSectionHead = c.getSectionHead(c.calcIdx - 1) oldHead = c.sectionHead(section - 1)
} }
// Process the newly defined section in the background
c.lock.Unlock() c.lock.Unlock()
sectionHead, ok := c.processSection(c.calcIdx, lastSectionHead) newHead, err := c.processSection(section, oldHead)
c.lock.Lock() c.lock.Lock()
if ok && lastSectionHead == c.getSectionHead(c.calcIdx-1) { // If processing succeeded and no reorgs occcurred, mark the section completed
c.stored = c.calcIdx + 1 if err == nil && oldHead == c.sectionHead(section-1) {
c.setSectionHead(c.calcIdx, sectionHead) c.setSectionHead(section, newHead)
c.setValidSections(c.stored) c.setValidSections(section + 1)
if updateMsg {
c.backend.UpdateMsg(c.stored, c.targetCount) c.cascadedHead = c.storedSections*c.sectionSize - 1
if c.stored >= c.targetCount { for _, child := range c.children {
updateMsg = false c.log.Trace("Cascading chain index update", "head", c.cascadedHead)
} child.newHead(c.cascadedHead, false)
}
c.lastForwarded = c.stored*c.sectionSize - 1
for _, cp := range c.children {
cp.newHead(c.lastForwarded, false)
} }
} else { } else {
// if processing has failed, do not retry until further notification // If processing failed, don't retry until further notification
c.targetCount = c.stored c.log.Debug("Chain index processing failed", "section", section, "err", err)
c.knownSections = c.storedSections
} }
} }
// If there are still further sections to process, reschedule
if c.targetCount > c.stored { if c.knownSections > c.storedSections {
go func() { time.AfterFunc(c.throttling, func() {
time.Sleep(c.procWait) select {
c.tryUpdate <- struct{}{} case c.update <- struct{}{}:
}() default:
} else { }
c.updating = false })
} }
c.lock.Unlock() c.lock.Unlock()
} }
} }
} }
// ChainEventLoop runs in a goroutine and feeds blockchain events to the indexer by calling newHead // processSection processes an entire section by calling backend functions while
// (not needed for child indexers where the parent calls newHead) // ensuring the continuity of the passed headers. Since the chain mutex is not
func (c *ChainIndexer) ChainEventLoop(currentHeader *types.Header, eventMux *event.TypeMux) { // held while processing, the continuity can be broken by a long reorg, in which
sub := eventMux.Subscribe(ChainEvent{}) // case the function returns with an error.
c.newHead(currentHeader.Number.Uint64(), false) func (c *ChainIndexer) processSection(section uint64, lastHead common.Hash) (common.Hash, error) {
lastHead := currentHeader.Hash() c.log.Trace("Processing new chain section", "section", section)
for {
select { // Reset and partial processing
case <-c.stop: c.backend.Reset(section)
return
case ev := <-sub.Chan(): for number := section * c.sectionSize; number < (section+1)*c.sectionSize; number++ {
header := ev.Data.(ChainEvent).Block.Header() hash := GetCanonicalHash(c.chainDb, number)
c.newHead(header.Number.Uint64(), header.ParentHash != lastHead) if hash == (common.Hash{}) {
lastHead = header.Hash() return common.Hash{}, fmt.Errorf("canonical block #%d unknown", number)
} }
header := GetHeader(c.chainDb, hash, number)
if header == nil {
return common.Hash{}, fmt.Errorf("block #%d [%x…] not found", number, hash[:4])
} else if header.ParentHash != lastHead {
return common.Hash{}, fmt.Errorf("chain reorged during section processing")
}
c.backend.Process(header)
lastHead = header.Hash()
} }
if err := c.backend.Commit(c.chainDb); err != nil {
return common.Hash{}, err
}
return lastHead, nil
}
// Sections returns the number of processed sections maintained by the indexer
// and also the information about the last header indexed for potential canonical
// verifications.
func (c *ChainIndexer) Sections() (uint64, uint64, common.Hash) {
c.lock.Lock()
defer c.lock.Unlock()
return c.storedSections, c.storedSections*c.sectionSize - 1, c.sectionHead(c.storedSections - 1)
} }
// AddChildIndexer adds a child ChainIndexer that can use the output of this one // AddChildIndexer adds a child ChainIndexer that can use the output of this one
func (c *ChainIndexer) AddChildIndexer(ci *ChainIndexer) { func (c *ChainIndexer) AddChildIndexer(indexer *ChainIndexer) {
c.children = append(c.children, ci)
}
// newHead notifies the indexer about new chain heads or rollbacks
func (c *ChainIndexer) newHead(headNum uint64, rollback bool) {
c.lock.Lock() c.lock.Lock()
defer c.lock.Unlock() defer c.lock.Unlock()
if rollback { c.children = append(c.children, indexer)
firstChanged := headNum / c.sectionSize
if firstChanged < c.targetCount {
c.targetCount = firstChanged
}
if firstChanged < c.stored {
c.stored = firstChanged
c.setValidSections(c.stored)
}
headNum = firstChanged * c.sectionSize
if headNum < c.lastForwarded { // Cascade any pending updates to new children too
c.lastForwarded = headNum if c.storedSections > 0 {
for _, cp := range c.children { indexer.newHead(c.storedSections*c.sectionSize-1, false)
cp.newHead(c.lastForwarded, true)
}
}
} else {
var newCount uint64
if headNum >= c.confirmReq {
newCount = (headNum + 1 - c.confirmReq) / c.sectionSize
if newCount > c.targetCount {
c.targetCount = newCount
if !c.updating {
c.updating = true
c.tryUpdate <- struct{}{}
}
}
}
} }
} }
// processSection processes an entire section by calling backend functions while ensuring // loadValidSections reads the number of valid sections from the index database
// the continuity of the passed headers. Since the chain mutex is not held while processing, // and caches is into the local state.
// the continuity can be broken by a long reorg, in which case the function returns with ok == false. func (c *ChainIndexer) loadValidSections() {
func (c *ChainIndexer) processSection(section uint64, lastSectionHead common.Hash) (sectionHead common.Hash, ok bool) {
c.backend.Reset(section)
head := lastSectionHead
for i := section * c.sectionSize; i < (section+1)*c.sectionSize; i++ {
hash := GetCanonicalHash(c.chainDb, i)
if hash == (common.Hash{}) {
return common.Hash{}, false
}
header := GetHeader(c.chainDb, hash, i)
if header == nil || header.ParentHash != head {
return common.Hash{}, false
}
c.backend.Process(header)
head = header.Hash()
}
if err := c.backend.Commit(c.chainDb); err != nil {
return common.Hash{}, false
}
return head, true
}
// CanonicalSections returns the number of processed sections that are consistent with
// the current canonical chain
func (c *ChainIndexer) CanonicalSections() uint64 {
c.lock.Lock()
defer c.lock.Unlock()
cnt := c.getValidSections()
for cnt > 0 {
if c.getSectionHead(cnt-1) == GetCanonicalHash(c.chainDb, cnt*c.sectionSize-1) {
break
}
cnt--
c.setValidSections(cnt)
}
return cnt
}
// getValidSections reads the number of valid sections from the index database
func (c *ChainIndexer) getValidSections() uint64 {
data, _ := c.indexDb.Get([]byte("count")) data, _ := c.indexDb.Get([]byte("count"))
if len(data) == 8 { if len(data) == 8 {
return binary.BigEndian.Uint64(data[:]) c.storedSections = binary.BigEndian.Uint64(data[:])
} }
return 0
} }
// setValidSections writes the number of valid sections to the index database // setValidSections writes the number of valid sections to the index database
func (c *ChainIndexer) setValidSections(cnt uint64) { func (c *ChainIndexer) setValidSections(sections uint64) {
oldCnt := c.getValidSections() // Set the current number of valid sections in the database
if cnt < oldCnt {
for i := cnt; i < oldCnt; i++ {
c.removeSectionHead(i)
}
}
var data [8]byte var data [8]byte
binary.BigEndian.PutUint64(data[:], cnt) binary.BigEndian.PutUint64(data[:], sections)
c.indexDb.Put([]byte("count"), data[:]) c.indexDb.Put([]byte("count"), data[:])
// Remove any reorged sections, caching the valids in the mean time
for c.storedSections > sections {
c.storedSections--
c.removeSectionHead(c.storedSections)
}
c.storedSections = sections // needed if new > old
} }
// getSectionHead reads the last block hash of a processed section from the index database // sectionHead retrieves the last block hash of a processed section from the
func (c *ChainIndexer) getSectionHead(idx uint64) common.Hash { // index database.
func (c *ChainIndexer) sectionHead(section uint64) common.Hash {
var data [8]byte var data [8]byte
binary.BigEndian.PutUint64(data[:], idx) binary.BigEndian.PutUint64(data[:], section)
hash, _ := c.indexDb.Get(append([]byte("shead"), data[:]...)) hash, _ := c.indexDb.Get(append([]byte("shead"), data[:]...))
if len(hash) == len(common.Hash{}) { if len(hash) == len(common.Hash{}) {
@ -277,18 +377,20 @@ func (c *ChainIndexer) getSectionHead(idx uint64) common.Hash {
return common.Hash{} return common.Hash{}
} }
// setSectionHead writes the last block hash of a processed section to the index database // setSectionHead writes the last block hash of a processed section to the index
func (c *ChainIndexer) setSectionHead(idx uint64, shead common.Hash) { // database.
func (c *ChainIndexer) setSectionHead(section uint64, hash common.Hash) {
var data [8]byte var data [8]byte
binary.BigEndian.PutUint64(data[:], idx) binary.BigEndian.PutUint64(data[:], section)
c.indexDb.Put(append([]byte("shead"), data[:]...), shead.Bytes()) c.indexDb.Put(append([]byte("shead"), data[:]...), hash.Bytes())
} }
// removeSectionHead removes the reference to a processed section from the index database // removeSectionHead removes the reference to a processed section from the index
func (c *ChainIndexer) removeSectionHead(idx uint64) { // database.
func (c *ChainIndexer) removeSectionHead(section uint64) {
var data [8]byte var data [8]byte
binary.BigEndian.PutUint64(data[:], idx) binary.BigEndian.PutUint64(data[:], section)
c.indexDb.Delete(append([]byte("shead"), data[:]...)) c.indexDb.Delete(append([]byte("shead"), data[:]...))
} }

269
core/chain_indexer_test.go
View File

@ -14,11 +14,10 @@
// You should have received a copy of the GNU Lesser General Public License // 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/>. // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package core implements the Ethereum consensus protocol.
package core package core
import ( import (
"encoding/binary" "fmt"
"math/big" "math/big"
"math/rand" "math/rand"
"testing" "testing"
@ -28,208 +27,208 @@ import (
"github.com/ethereum/go-ethereum/ethdb" "github.com/ethereum/go-ethereum/ethdb"
) )
// Runs multiple tests with randomized parameters.
func TestChainIndexerSingle(t *testing.T) { func TestChainIndexerSingle(t *testing.T) {
// run multiple tests with randomized parameters
for i := 0; i < 10; i++ { for i := 0; i < 10; i++ {
testChainIndexer(t, 1) testChainIndexer(t, 1)
} }
} }
// Runs multiple tests with randomized parameters and different number of
// chain backends.
func TestChainIndexerWithChildren(t *testing.T) { func TestChainIndexerWithChildren(t *testing.T) {
// run multiple tests with randomized parameters and different number of
// chained indexers
for i := 2; i < 8; i++ { for i := 2; i < 8; i++ {
testChainIndexer(t, i) testChainIndexer(t, i)
} }
} }
// testChainIndexer runs a test with either a single ChainIndexer or a chain of multiple indexers // testChainIndexer runs a test with either a single chain indexer or a chain of
// sectionSize and confirmReq parameters are randomized // multiple backends. The section size and required confirmation count parameters
func testChainIndexer(t *testing.T, tciCount int) { // are randomized.
func testChainIndexer(t *testing.T, count int) {
db, _ := ethdb.NewMemDatabase() db, _ := ethdb.NewMemDatabase()
stop := make(chan struct{}) defer db.Close()
tciList := make([]*testChainIndex, tciCount)
var lastIndexer *ChainIndexer
for i, _ := range tciList {
tci := &testChainIndex{t: t, sectionSize: uint64(rand.Intn(100) + 1), confirmReq: uint64(rand.Intn(10)), processCh: make(chan uint64)}
tciList[i] = tci
tci.indexer = NewChainIndexer(db, ethdb.NewTable(db, string([]byte{byte(i)})), tci, tci.sectionSize, tci.confirmReq, 0, stop)
if cs := tci.indexer.CanonicalSections(); cs != 0 {
t.Errorf("Expected 0 canonical sections, got %d", cs)
}
if lastIndexer != nil {
lastIndexer.AddChildIndexer(tci.indexer)
}
lastIndexer = tci.indexer
}
// expectCs expects a certain number of available canonical sections // Create a chain of indexers and ensure they all report empty
expectCs := func(indexer *ChainIndexer, expCs uint64) { backends := make([]*testChainIndexBackend, count)
cnt := 0 for i := 0; i < count; i++ {
for { var (
cs := indexer.CanonicalSections() sectionSize = uint64(rand.Intn(100) + 1)
if cs == expCs { confirmsReq = uint64(rand.Intn(10))
return )
} backends[i] = &testChainIndexBackend{t: t, processCh: make(chan uint64)}
// keep trying for 10 seconds if it does not match backends[i].indexer = NewChainIndexer(db, ethdb.NewTable(db, string([]byte{byte(i)})), backends[i], sectionSize, confirmsReq, 0, fmt.Sprintf("indexer-%d", i))
cnt++ defer backends[i].indexer.Close()
if cnt == 10000 {
t.Fatalf("Expected %d canonical sections, got %d", expCs, cs) if sections, _, _ := backends[i].indexer.Sections(); sections != 0 {
} t.Fatalf("Canonical section count mismatch: have %v, want %v", sections, 0)
time.Sleep(time.Millisecond) }
if i > 0 {
backends[i-1].indexer.AddChildIndexer(backends[i].indexer)
} }
} }
// notify pings the root indexer about a new head or reorg, then expect
// notify the indexer about a new head or rollback, then expect processed blocks if a section is processable // processed blocks if a section is processable
notify := func(headNum, expFailAfter uint64, rollback bool) { notify := func(headNum, failNum uint64, reorg bool) {
tciList[0].indexer.newHead(headNum, rollback) backends[0].indexer.newHead(headNum, reorg)
if rollback { if reorg {
for _, tci := range tciList { for _, backend := range backends {
headNum = tci.rollback(headNum) headNum = backend.reorg(headNum)
expectCs(tci.indexer, tci.stored) backend.assertSections()
} }
} else { return
for _, tci := range tciList { }
var more bool var cascade bool
headNum, more = tci.newBlocks(headNum, expFailAfter) for _, backend := range backends {
if !more { headNum, cascade = backend.assertBlocks(headNum, failNum)
break if !cascade {
} break
expectCs(tci.indexer, tci.stored)
} }
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 = GetCanonicalHash(db, number-1)
}
WriteHeader(db, header)
WriteCanonicalHash(db, header.Hash(), number)
}
// Start indexer with an already existing chain
for i := uint64(0); i <= 100; i++ { for i := uint64(0); i <= 100; i++ {
testCanonicalHeader(db, i) inject(i)
} }
// start indexer with an already existing chain
notify(100, 100, false) notify(100, 100, false)
// add new blocks one by one
for i := uint64(101); i <= 1000; i++ {
testCanonicalHeader(db, i)
notify(i, i, false)
}
// do a rollback
notify(500, 500, true)
// create new fork
for i := uint64(501); i <= 1000; i++ {
testCanonicalHeader(db, i)
notify(i, i, false)
}
for i := uint64(1001); i <= 1500; i++ { // Add new blocks one by one
testCanonicalHeader(db, i) for i := uint64(101); i <= 1000; i++ {
inject(i)
notify(i, i, false)
} }
// create a failed processing scenario where less blocks are available at processing time than notified // 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(2000, 1500, false)
// notify about a rollback (which could have caused the missing blocks if happened during processing)
// Notify about a reorg (which could have caused the missing blocks if happened during processing)
notify(1500, 1500, true) notify(1500, 1500, true)
// create new fork // Create new fork
for i := uint64(1501); i <= 2000; i++ { for i := uint64(1501); i <= 2000; i++ {
testCanonicalHeader(db, i) inject(i)
notify(i, i, false) notify(i, i, false)
} }
close(stop)
db.Close()
} }
func testCanonicalHeader(db ethdb.Database, idx uint64) { // testChainIndexBackend implements ChainIndexerBackend
var rnd [8]byte type testChainIndexBackend struct {
binary.BigEndian.PutUint64(rnd[:], uint64(rand.Int63()))
header := &types.Header{Number: big.NewInt(int64(idx)), Extra: rnd[:]}
if idx > 0 {
header.ParentHash = GetCanonicalHash(db, idx-1)
}
WriteHeader(db, header)
WriteCanonicalHash(db, header.Hash(), idx)
}
// testChainIndex implements ChainIndexerBackend
type testChainIndex struct {
t *testing.T t *testing.T
sectionSize, confirmReq uint64
section, headerCnt, stored uint64
indexer *ChainIndexer indexer *ChainIndexer
section, headerCnt, stored uint64
processCh chan uint64 processCh chan uint64
} }
// newBlocks expects process calls after new blocks have arrived. If expFailAfter < headNum then // assertSections verifies if a chain indexer has the correct number of section.
// we are simulating a scenario where a rollback has happened after the processing has started and func (b *testChainIndexBackend) assertSections() {
// the processing of a section fails. // Keep trying for 3 seconds if it does not match
func (t *testChainIndex) newBlocks(headNum, expFailAfter uint64) (uint64, bool) { var sections uint64
var newCount uint64 for i := 0; i < 300; i++ {
if headNum >= t.confirmReq { sections, _, _ = b.indexer.Sections()
newCount = (headNum + 1 - t.confirmReq) / t.sectionSize if sections == b.stored {
if newCount > t.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 // expect processed blocks
for exp := t.stored * t.sectionSize; exp < newCount*t.sectionSize; exp++ { for expectd := b.stored * b.indexer.sectionSize; expectd < sections*b.indexer.sectionSize; expectd++ {
if exp > expFailAfter { if expectd > failNum {
// rolled back after processing started, no more process calls expected // rolled back after processing started, no more process calls expected
// wait until updating is done to make sure that processing actually fails // wait until updating is done to make sure that processing actually fails
for { var updating bool
t.indexer.lock.Lock() for i := 0; i < 300; i++ {
u := t.indexer.updating b.indexer.lock.Lock()
t.indexer.lock.Unlock() updating = b.indexer.knownSections > b.indexer.storedSections
if !u { b.indexer.lock.Unlock()
if !updating {
break break
} }
time.Sleep(time.Millisecond) time.Sleep(10 * time.Millisecond)
} }
if updating {
newCount = exp / t.sectionSize b.t.Fatalf("update did not finish")
}
sections = expectd / b.indexer.sectionSize
break break
} }
select { select {
case <-time.After(10 * time.Second): case <-time.After(10 * time.Second):
t.t.Fatalf("Expected processed block #%d, got nothing", exp) b.t.Fatalf("Expected processed block #%d, got nothing", expectd)
case proc := <-t.processCh: case processed := <-b.processCh:
if proc != exp { if processed != expectd {
t.t.Errorf("Expected processed block #%d, got #%d", exp, proc) b.t.Errorf("Expected processed block #%d, got #%d", expectd, processed)
} }
} }
} }
t.stored = newCount b.stored = sections
} }
} }
if t.stored == 0 { if b.stored == 0 {
return 0, false return 0, false
} }
return t.stored*t.sectionSize - 1, true return b.stored*b.indexer.sectionSize - 1, true
} }
func (t *testChainIndex) rollback(headNum uint64) uint64 { func (b *testChainIndexBackend) reorg(headNum uint64) uint64 {
firstChanged := headNum / t.sectionSize firstChanged := headNum / b.indexer.sectionSize
if firstChanged < t.stored { if firstChanged < b.stored {
t.stored = firstChanged b.stored = firstChanged
} }
return t.stored * t.sectionSize return b.stored * b.indexer.sectionSize
} }
func (t *testChainIndex) Reset(section uint64) { func (b *testChainIndexBackend) Reset(section uint64) {
t.section = section b.section = section
t.headerCnt = 0 b.headerCnt = 0
} }
func (t *testChainIndex) Process(header *types.Header) { func (b *testChainIndexBackend) Process(header *types.Header) {
t.headerCnt++ b.headerCnt++
if t.headerCnt > t.sectionSize { if b.headerCnt > b.indexer.sectionSize {
t.t.Error("Processing too many headers") b.t.Error("Processing too many headers")
} }
//t.processCh <- header.Number.Uint64() //t.processCh <- header.Number.Uint64()
select { select {
case <-time.After(10 * time.Second): case <-time.After(10 * time.Second):
t.t.Fatal("Unexpected call to Process") b.t.Fatal("Unexpected call to Process")
case t.processCh <- header.Number.Uint64(): case b.processCh <- header.Number.Uint64():
} }
} }
func (t *testChainIndex) Commit(db ethdb.Database) error { func (b *testChainIndexBackend) Commit(db ethdb.Database) error {
if t.headerCnt != t.sectionSize { if b.headerCnt != b.indexer.sectionSize {
t.t.Error("Not enough headers processed") b.t.Error("Not enough headers processed")
} }
return nil return nil
} }
func (t *testChainIndex) UpdateMsg(done, all uint64) {}