// DeliverBodies injects a block body retrieval response into the results queue. // The method returns the number of blocks bodies accepted from the delivery and // also wakes any threads waiting for data delivery. func (q *queue) DeliverBodies(id string, txLists [][]*types.Transaction, uncleLists [][]*types.Header) (int, error) { q.lock.Lock() defer q.lock.Unlock() reconstruct := func(header *types.Header, index int, result *fetchResult) error { if types.DeriveSha(types.Transactions(txLists[index])) != header.TxHash || types.CalcUncleHash(uncleLists[index]) != header.UncleHash { return errInvalidBody } result.Transactions = txLists[index] result.Uncles = uncleLists[index] return nil } return q.deliver(id, q.blockTaskPool, q.blockTaskQueue, q.blockPendPool, q.blockDonePool, bodyReqTimer, len(txLists), reconstruct) }
// ValidateBlock validates the given block's header and uncles and verifies the // the block header's transaction and uncle roots. // // ValidateBlock does not validate the header's pow. The pow work validated // seperately so we can process them in paralel. // // ValidateBlock also validates and makes sure that any previous state (or present) // state that might or might not be present is checked to make sure that fast // sync has done it's job proper. This prevents the block validator form accepting // false positives where a header is present but the state is not. func (v *BlockValidator) ValidateBlock(block *types.Block) error { if v.bc.HasBlock(block.Hash()) { if _, err := state.New(block.Root(), v.bc.chainDb); err == nil { return &KnownBlockError{block.Number(), block.Hash()} } } parent := v.bc.GetBlock(block.ParentHash()) if parent == nil { return ParentError(block.ParentHash()) } if _, err := state.New(parent.Root(), v.bc.chainDb); err != nil { return ParentError(block.ParentHash()) } header := block.Header() // validate the block header if err := ValidateHeader(v.Pow, header, parent.Header(), false, false); err != nil { return err } // verify the uncles are correctly rewarded if err := v.VerifyUncles(block, parent); err != nil { return err } // Verify UncleHash before running other uncle validations unclesSha := types.CalcUncleHash(block.Uncles()) if unclesSha != header.UncleHash { return fmt.Errorf("invalid uncles root hash. received=%x calculated=%x", header.UncleHash, unclesSha) } // The transactions Trie's root (R = (Tr [[i, RLP(T1)], [i, RLP(T2)], ... [n, RLP(Tn)]])) // can be used by light clients to make sure they've received the correct Txs txSha := types.DeriveSha(block.Transactions()) if txSha != header.TxHash { return fmt.Errorf("invalid transaction root hash. received=%x calculated=%x", header.TxHash, txSha) } return nil }
// Loop is the main fetcher loop, checking and processing various notification // events. func (f *Fetcher) loop() { // Iterate the block fetching until a quit is requested fetchTimer := time.NewTimer(0) completeTimer := time.NewTimer(0) for { // Clean up any expired block fetches for hash, announce := range f.fetching { if time.Since(announce.time) > fetchTimeout { f.forgetHash(hash) } } // Import any queued blocks that could potentially fit height := f.chainHeight() for !f.queue.Empty() { op := f.queue.PopItem().(*inject) if f.queueChangeHook != nil { f.queueChangeHook(op.block.Hash(), false) } // If too high up the chain or phase, continue later number := op.block.NumberU64() if number > height+1 { f.queue.Push(op, -float32(op.block.NumberU64())) if f.queueChangeHook != nil { f.queueChangeHook(op.block.Hash(), true) } break } // Otherwise if fresh and still unknown, try and import hash := op.block.Hash() if number+maxUncleDist < height || f.getBlock(hash) != nil { f.forgetBlock(hash) continue } f.insert(op.origin, op.block) } // Wait for an outside event to occur select { case <-f.quit: // Fetcher terminating, abort all operations return case notification := <-f.notify: // A block was announced, make sure the peer isn't DOSing us propAnnounceInMeter.Mark(1) count := f.announces[notification.origin] + 1 if count > hashLimit { glog.V(logger.Debug).Infof("Peer %s: exceeded outstanding announces (%d)", notification.origin, hashLimit) propAnnounceDOSMeter.Mark(1) break } // If we have a valid block number, check that it's potentially useful if notification.number > 0 { if dist := int64(notification.number) - int64(f.chainHeight()); dist < -maxUncleDist || dist > maxQueueDist { glog.V(logger.Debug).Infof("[eth/62] Peer %s: discarded announcement #%d [%x…], distance %d", notification.origin, notification.number, notification.hash[:4], dist) propAnnounceDropMeter.Mark(1) break } } // All is well, schedule the announce if block's not yet downloading if _, ok := f.fetching[notification.hash]; ok { break } if _, ok := f.completing[notification.hash]; ok { break } f.announces[notification.origin] = count f.announced[notification.hash] = append(f.announced[notification.hash], notification) if f.announceChangeHook != nil && len(f.announced[notification.hash]) == 1 { f.announceChangeHook(notification.hash, true) } if len(f.announced) == 1 { f.rescheduleFetch(fetchTimer) } case op := <-f.inject: // A direct block insertion was requested, try and fill any pending gaps propBroadcastInMeter.Mark(1) f.enqueue(op.origin, op.block) case hash := <-f.done: // A pending import finished, remove all traces of the notification f.forgetHash(hash) f.forgetBlock(hash) case <-fetchTimer.C: // At least one block's timer ran out, check for needing retrieval request := make(map[string][]common.Hash) for hash, announces := range f.announced { if time.Since(announces[0].time) > arriveTimeout-gatherSlack { // Pick a random peer to retrieve from, reset all others announce := announces[rand.Intn(len(announces))] f.forgetHash(hash) // If the block still didn't arrive, queue for fetching if f.getBlock(hash) == nil { request[announce.origin] = append(request[announce.origin], hash) f.fetching[hash] = announce } } } // Send out all block (eth/61) or header (eth/62) requests for peer, hashes := range request { if glog.V(logger.Detail) && len(hashes) > 0 { list := "[" for _, hash := range hashes { list += fmt.Sprintf("%x…, ", hash[:4]) } list = list[:len(list)-2] + "]" if f.fetching[hashes[0]].fetch61 != nil { glog.V(logger.Detail).Infof("[eth/61] Peer %s: fetching blocks %s", peer, list) } else { glog.V(logger.Detail).Infof("[eth/62] Peer %s: fetching headers %s", peer, list) } } // Create a closure of the fetch and schedule in on a new thread fetchBlocks, fetchHeader, hashes := f.fetching[hashes[0]].fetch61, f.fetching[hashes[0]].fetchHeader, hashes go func() { if f.fetchingHook != nil { f.fetchingHook(hashes) } if fetchBlocks != nil { // Use old eth/61 protocol to retrieve whole blocks blockFetchMeter.Mark(int64(len(hashes))) fetchBlocks(hashes) } else { // Use new eth/62 protocol to retrieve headers first for _, hash := range hashes { headerFetchMeter.Mark(1) fetchHeader(hash) // Suboptimal, but protocol doesn't allow batch header retrievals } } }() } // Schedule the next fetch if blocks are still pending f.rescheduleFetch(fetchTimer) case <-completeTimer.C: // At least one header's timer ran out, retrieve everything request := make(map[string][]common.Hash) for hash, announces := range f.fetched { // Pick a random peer to retrieve from, reset all others announce := announces[rand.Intn(len(announces))] f.forgetHash(hash) // If the block still didn't arrive, queue for completion if f.getBlock(hash) == nil { request[announce.origin] = append(request[announce.origin], hash) f.completing[hash] = announce } } // Send out all block body requests for peer, hashes := range request { if glog.V(logger.Detail) && len(hashes) > 0 { list := "[" for _, hash := range hashes { list += fmt.Sprintf("%x…, ", hash[:4]) } list = list[:len(list)-2] + "]" glog.V(logger.Detail).Infof("[eth/62] Peer %s: fetching bodies %s", peer, list) } // Create a closure of the fetch and schedule in on a new thread if f.completingHook != nil { f.completingHook(hashes) } bodyFetchMeter.Mark(int64(len(hashes))) go f.completing[hashes[0]].fetchBodies(hashes) } // Schedule the next fetch if blocks are still pending f.rescheduleComplete(completeTimer) case filter := <-f.blockFilter: // Blocks arrived, extract any explicit fetches, return all else var blocks types.Blocks select { case blocks = <-filter: case <-f.quit: return } blockFilterInMeter.Mark(int64(len(blocks))) explicit, download := []*types.Block{}, []*types.Block{} for _, block := range blocks { hash := block.Hash() // Filter explicitly requested blocks from hash announcements if f.fetching[hash] != nil && f.queued[hash] == nil { // Discard if already imported by other means if f.getBlock(hash) == nil { explicit = append(explicit, block) } else { f.forgetHash(hash) } } else { download = append(download, block) } } blockFilterOutMeter.Mark(int64(len(download))) select { case filter <- download: case <-f.quit: return } // Schedule the retrieved blocks for ordered import for _, block := range explicit { if announce := f.fetching[block.Hash()]; announce != nil { f.enqueue(announce.origin, block) } } case filter := <-f.headerFilter: // Headers arrived from a remote peer. Extract those that were explicitly // requested by the fetcher, and return everything else so it's delivered // to other parts of the system. var task *headerFilterTask select { case task = <-filter: case <-f.quit: return } headerFilterInMeter.Mark(int64(len(task.headers))) // Split the batch of headers into unknown ones (to return to the caller), // known incomplete ones (requiring body retrievals) and completed blocks. unknown, incomplete, complete := []*types.Header{}, []*announce{}, []*types.Block{} for _, header := range task.headers { hash := header.Hash() // Filter fetcher-requested headers from other synchronisation algorithms if announce := f.fetching[hash]; announce != nil && f.fetched[hash] == nil && f.completing[hash] == nil && f.queued[hash] == nil { // If the delivered header does not match the promised number, drop the announcer if header.Number.Uint64() != announce.number { glog.V(logger.Detail).Infof("[eth/62] Peer %s: invalid block number for [%x…]: announced %d, provided %d", announce.origin, header.Hash().Bytes()[:4], announce.number, header.Number.Uint64()) f.dropPeer(announce.origin) f.forgetHash(hash) continue } // Only keep if not imported by other means if f.getBlock(hash) == nil { announce.header = header announce.time = task.time // If the block is empty (header only), short circuit into the final import queue if header.TxHash == types.DeriveSha(types.Transactions{}) && header.UncleHash == types.CalcUncleHash([]*types.Header{}) { glog.V(logger.Detail).Infof("[eth/62] Peer %s: block #%d [%x…] empty, skipping body retrieval", announce.origin, header.Number.Uint64(), header.Hash().Bytes()[:4]) block := types.NewBlockWithHeader(header) block.ReceivedAt = task.time complete = append(complete, block) f.completing[hash] = announce continue } // Otherwise add to the list of blocks needing completion incomplete = append(incomplete, announce) } else { glog.V(logger.Detail).Infof("[eth/62] Peer %s: block #%d [%x…] already imported, discarding header", announce.origin, header.Number.Uint64(), header.Hash().Bytes()[:4]) f.forgetHash(hash) } } else { // Fetcher doesn't know about it, add to the return list unknown = append(unknown, header) } } headerFilterOutMeter.Mark(int64(len(unknown))) select { case filter <- &headerFilterTask{headers: unknown, time: task.time}: case <-f.quit: return } // Schedule the retrieved headers for body completion for _, announce := range incomplete { hash := announce.header.Hash() if _, ok := f.completing[hash]; ok { continue } f.fetched[hash] = append(f.fetched[hash], announce) if len(f.fetched) == 1 { f.rescheduleComplete(completeTimer) } } // Schedule the header-only blocks for import for _, block := range complete { if announce := f.completing[block.Hash()]; announce != nil { f.enqueue(announce.origin, block) } } case filter := <-f.bodyFilter: // Block bodies arrived, extract any explicitly requested blocks, return the rest var task *bodyFilterTask select { case task = <-filter: case <-f.quit: return } bodyFilterInMeter.Mark(int64(len(task.transactions))) blocks := []*types.Block{} for i := 0; i < len(task.transactions) && i < len(task.uncles); i++ { // Match up a body to any possible completion request matched := false for hash, announce := range f.completing { if f.queued[hash] == nil { txnHash := types.DeriveSha(types.Transactions(task.transactions[i])) uncleHash := types.CalcUncleHash(task.uncles[i]) if txnHash == announce.header.TxHash && uncleHash == announce.header.UncleHash { // Mark the body matched, reassemble if still unknown matched = true if f.getBlock(hash) == nil { block := types.NewBlockWithHeader(announce.header).WithBody(task.transactions[i], task.uncles[i]) block.ReceivedAt = task.time blocks = append(blocks, block) } else { f.forgetHash(hash) } } } } if matched { task.transactions = append(task.transactions[:i], task.transactions[i+1:]...) task.uncles = append(task.uncles[:i], task.uncles[i+1:]...) i-- continue } } bodyFilterOutMeter.Mark(int64(len(task.transactions))) select { case filter <- task: case <-f.quit: return } // Schedule the retrieved blocks for ordered import for _, block := range blocks { if announce := f.completing[block.Hash()]; announce != nil { f.enqueue(announce.origin, block) } } } } }