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core, eth, trie: fix issues raised by reviewers

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This commit is contained in:
Péter Szilágyi 2015-10-13 12:04:25 +03:00
parent 4fc1e1a914
commit 515ecc62cb
10 changed files with 67 additions and 74 deletions
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47
core/blockchain.go
View file

@ -178,21 +178,21 @@ func (self *BlockChain) loadLastState() error {
fastTd := self.GetTd(self.currentFastBlock.Hash())
glog.V(logger.Info).Infof("Last header: #%d [%x…] TD=%v", self.currentHeader.Number, self.currentHeader.Hash().Bytes()[:4], headerTd)
glog.V(logger.Info).Infof("Fast block: #%d [%x…] TD=%v", self.currentFastBlock.Number(), self.currentFastBlock.Hash().Bytes()[:4], fastTd)
glog.V(logger.Info).Infof("Last block: #%d [%x…] TD=%v", self.currentBlock.Number(), self.currentBlock.Hash().Bytes()[:4], blockTd)
glog.V(logger.Info).Infof("Fast block: #%d [%x…] TD=%v", self.currentFastBlock.Number(), self.currentFastBlock.Hash().Bytes()[:4], fastTd)
return nil
}
// SetHead rewind the local chain to a new head entity. In the case of headers,
// everything above the new head will be deleted and the new one set. In the case
// of blocks though, the head may be further rewound if block bodies are missing
// (non-archive nodes after a fast sync).
// SetHead rewinds the local chain to a new head. In the case of headers, everything
// above the new head will be deleted and the new one set. In the case of blocks
// though, the head may be further rewound if block bodies are missing (non-archive
// nodes after a fast sync).
func (bc *BlockChain) SetHead(head uint64) {
bc.mu.Lock()
defer bc.mu.Unlock()
// Figure out the highest known canonical assignment
// Figure out the highest known canonical headers and/or blocks
height := uint64(0)
if bc.currentHeader != nil {
if hh := bc.currentHeader.Number.Uint64(); hh > height {
@ -266,7 +266,7 @@ func (bc *BlockChain) SetHead(head uint64) {
// FastSyncCommitHead sets the current head block to the one defined by the hash
// irrelevant what the chain contents were prior.
func (self *BlockChain) FastSyncCommitHead(hash common.Hash) error {
// Make sure that both the block as well at it's state trie exists
// Make sure that both the block as well at its state trie exists
block := self.GetBlock(hash)
if block == nil {
return fmt.Errorf("non existent block [%x…]", hash[:4])
@ -298,7 +298,7 @@ func (self *BlockChain) LastBlockHash() common.Hash {
}
// CurrentHeader retrieves the current head header of the canonical chain. The
// header is retrieved from the chain manager's internal cache.
// header is retrieved from the blockchain's internal cache.
func (self *BlockChain) CurrentHeader() *types.Header {
self.mu.RLock()
defer self.mu.RUnlock()
@ -307,7 +307,7 @@ func (self *BlockChain) CurrentHeader() *types.Header {
}
// CurrentBlock retrieves the current head block of the canonical chain. The
// block is retrieved from the chain manager's internal cache.
// block is retrieved from the blockchain's internal cache.
func (self *BlockChain) CurrentBlock() *types.Block {
self.mu.RLock()
defer self.mu.RUnlock()
@ -316,7 +316,7 @@ func (self *BlockChain) CurrentBlock() *types.Block {
}
// CurrentFastBlock retrieves the current fast-sync head block of the canonical
// chain. The block is retrieved from the chain manager's internal cache.
// chain. The block is retrieved from the blockchain's internal cache.
func (self *BlockChain) CurrentFastBlock() *types.Block {
self.mu.RLock()
defer self.mu.RUnlock()
@ -353,7 +353,7 @@ func (bc *BlockChain) ResetWithGenesisBlock(genesis *types.Block) {
bc.mu.Lock()
defer bc.mu.Unlock()
// Prepare the genesis block and reinitialize the chain
// Prepare the genesis block and reinitialise the chain
if err := WriteTd(bc.chainDb, genesis.Hash(), genesis.Difficulty()); err != nil {
glog.Fatalf("failed to write genesis block TD: %v", err)
}
@ -403,7 +403,7 @@ func (self *BlockChain) ExportN(w io.Writer, first uint64, last uint64) error {
// insert injects a new head block into the current block chain. This method
// assumes that the block is indeed a true head. It will also reset the head
// header and the head fast sync block to this very same block to prevent them
// from diverging on a different header chain.
// from pointing to a possibly old canonical chain (i.e. side chain by now).
//
// Note, this function assumes that the `mu` mutex is held!
func (bc *BlockChain) insert(block *types.Block) {
@ -632,10 +632,10 @@ const (
// writeHeader writes a header into the local chain, given that its parent is
// already known. If the total difficulty of the newly inserted header becomes
// greater than the old known TD, the canonical chain is re-routed.
// greater than the current known TD, the canonical chain is re-routed.
//
// Note: This method is not concurrent-safe with inserting blocks simultaneously
// into the chain, as side effects caused by reorganizations cannot be emulated
// into the chain, as side effects caused by reorganisations cannot be emulated
// without the real blocks. Hence, writing headers directly should only be done
// in two scenarios: pure-header mode of operation (light clients), or properly
// separated header/block phases (non-archive clients).
@ -685,10 +685,9 @@ func (self *BlockChain) writeHeader(header *types.Header) error {
return nil
}
// InsertHeaderChain will attempt to insert the given header chain in to the
// local chain, possibly creating a fork. If an error is returned, it will
// return the index number of the failing header as well an error describing
// what went wrong.
// InsertHeaderChain attempts to insert the given header chain in to the local
// chain, possibly creating a reorg. If an error is returned, it will return the
// index number of the failing header as well an error describing what went wrong.
//
// The verify parameter can be used to fine tune whether nonce verification
// should be done or not. The reason behind the optional check is because some
@ -773,10 +772,6 @@ func (self *BlockChain) InsertHeaderChain(chain []*types.Header, checkFreq int)
pending.Wait()
// If anything failed, report
if atomic.LoadInt32(&self.procInterrupt) == 1 {
glog.V(logger.Debug).Infoln("premature abort during receipt chain processing")
return 0, nil
}
if failed > 0 {
for i, err := range errs {
if err != nil {
@ -927,10 +922,6 @@ func (self *BlockChain) InsertReceiptChain(blockChain types.Blocks, receiptChain
pending.Wait()
// If anything failed, report
if atomic.LoadInt32(&self.procInterrupt) == 1 {
glog.V(logger.Debug).Infoln("premature abort during receipt chain processing")
return 0, nil
}
if failed > 0 {
for i, err := range errs {
if err != nil {
@ -938,6 +929,10 @@ func (self *BlockChain) InsertReceiptChain(blockChain types.Blocks, receiptChain
}
}
}
if atomic.LoadInt32(&self.procInterrupt) == 1 {
glog.V(logger.Debug).Infoln("premature abort during receipt chain processing")
return 0, nil
}
// Update the head fast sync block if better
self.mu.Lock()
head := blockChain[len(errs)-1]

3
core/state/sync.go
View file

@ -26,14 +26,13 @@ import (
"github.com/ethereum/go-ethereum/trie"
)
// StateSync is the main state synchronisation scheduler, which provides yet the
// StateSync is the main state synchronisation scheduler, which provides yet the
// unknown state hashes to retrieve, accepts node data associated with said hashes
// and reconstructs the state database step by step until all is done.
type StateSync trie.TrieSync
// NewStateSync create a new state trie download scheduler.
func NewStateSync(root common.Hash, database ethdb.Database) *StateSync {
// Pre-declare the result syncer t
var syncer *trie.TrieSync
callback := func(leaf []byte, parent common.Hash) error {

10
core/types/receipt.go
View file

@ -67,7 +67,7 @@ func (r *Receipt) DecodeRLP(s *rlp.Stream) error {
return nil
}
// RlpEncode implements common.RlpEncode required for SHA derivation.
// RlpEncode implements common.RlpEncode required for SHA3 derivation.
func (r *Receipt) RlpEncode() []byte {
bytes, err := rlp.EncodeToBytes(r)
if err != nil {
@ -82,7 +82,7 @@ func (r *Receipt) String() string {
}
// ReceiptForStorage is a wrapper around a Receipt that flattens and parses the
// entire content of a receipt, opposed to only the consensus fields originally.
// entire content of a receipt, as opposed to only the consensus fields originally.
type ReceiptForStorage Receipt
// EncodeRLP implements rlp.Encoder, and flattens all content fields of a receipt
@ -95,8 +95,8 @@ func (r *ReceiptForStorage) EncodeRLP(w io.Writer) error {
return rlp.Encode(w, []interface{}{r.PostState, r.CumulativeGasUsed, r.Bloom, r.TxHash, r.ContractAddress, logs, r.GasUsed})
}
// DecodeRLP implements rlp.Decoder, and loads the consensus fields of a receipt
// from an RLP stream.
// DecodeRLP implements rlp.Decoder, and loads both consensus and implementation
// fields of a receipt from an RLP stream.
func (r *ReceiptForStorage) DecodeRLP(s *rlp.Stream) error {
var receipt struct {
PostState []byte
@ -125,7 +125,7 @@ func (r *ReceiptForStorage) DecodeRLP(s *rlp.Stream) error {
// Receipts is a wrapper around a Receipt array to implement types.DerivableList.
type Receipts []*Receipt
// RlpEncode implements common.RlpEncode required for SHA derivation.
// RlpEncode implements common.RlpEncode required for SHA3 derivation.
func (r Receipts) RlpEncode() []byte {
bytes, err := rlp.EncodeToBytes(r)
if err != nil {

2
core/vm/log.go
View file

@ -66,6 +66,6 @@ func (l *Log) String() string {
type Logs []*Log
// LogForStorage is a wrapper around a Log that flattens and parses the entire
// content of a log, opposed to only the consensus fields originally (by hiding
// content of a log, as opposed to only the consensus fields originally (by hiding
// the rlp interface methods).
type LogForStorage Log

6
eth/downloader/downloader.go
View file

@ -844,7 +844,7 @@ func (d *Downloader) fetchBlocks61(from uint64) error {
for _, peer := range idles {
// Short circuit if throttling activated
if d.queue.ThrottleBlocks() {
if d.queue.ShouldThrottleBlocks() {
throttled = true
break
}
@ -1234,7 +1234,7 @@ func (d *Downloader) fetchBodies(from uint64) error {
setIdle = func(p *peer) { p.SetBlocksIdle() }
)
err := d.fetchParts(errCancelBodyFetch, d.bodyCh, deliver, d.bodyWakeCh, expire,
d.queue.PendingBlocks, d.queue.InFlightBlocks, d.queue.ThrottleBlocks, d.queue.ReserveBodies,
d.queue.PendingBlocks, d.queue.InFlightBlocks, d.queue.ShouldThrottleBlocks, d.queue.ReserveBodies,
d.bodyFetchHook, fetch, d.queue.CancelBodies, capacity, getIdles, setIdle, "Body")
glog.V(logger.Debug).Infof("Block body download terminated: %v", err)
@ -1258,7 +1258,7 @@ func (d *Downloader) fetchReceipts(from uint64) error {
setIdle = func(p *peer) { p.SetReceiptsIdle() }
)
err := d.fetchParts(errCancelReceiptFetch, d.receiptCh, deliver, d.receiptWakeCh, expire,
d.queue.PendingReceipts, d.queue.InFlightReceipts, d.queue.ThrottleReceipts, d.queue.ReserveReceipts,
d.queue.PendingReceipts, d.queue.InFlightReceipts, d.queue.ShouldThrottleReceipts, d.queue.ReserveReceipts,
d.receiptFetchHook, fetch, d.queue.CancelReceipts, capacity, d.peers.ReceiptIdlePeers, setIdle, "Receipt")
glog.V(logger.Debug).Infof("Receipt download terminated: %v", err)

4
eth/downloader/modes.go
View file

@ -20,7 +20,7 @@ package downloader
type SyncMode int
const (
FullSync SyncMode = iota // Synchronise the entire block-chain history from full blocks
FastSync // Quikcly download the headers, full sync only at the chain head
FullSync SyncMode = iota // Synchronise the entire blockchain history from full blocks
FastSync // Quickly download the headers, full sync only at the chain head
LightSync // Download only the headers and terminate afterwards
)

10
eth/downloader/peer.go
View file

@ -196,35 +196,35 @@ func (p *peer) FetchNodeData(request *fetchRequest) error {
// SetBlocksIdle sets the peer to idle, allowing it to execute new retrieval requests.
// Its block retrieval allowance will also be updated either up- or downwards,
// depending on whether the previous fetch completed in time or not.
// depending on whether the previous fetch completed in time.
func (p *peer) SetBlocksIdle() {
p.setIdle(p.blockStarted, blockSoftTTL, blockHardTTL, MaxBlockFetch, &p.blockCapacity, &p.blockIdle)
}
// SetBodiesIdle sets the peer to idle, allowing it to execute new retrieval requests.
// Its block body retrieval allowance will also be updated either up- or downwards,
// depending on whether the previous fetch completed in time or not.
// depending on whether the previous fetch completed in time.
func (p *peer) SetBodiesIdle() {
p.setIdle(p.blockStarted, bodySoftTTL, bodyHardTTL, MaxBlockFetch, &p.blockCapacity, &p.blockIdle)
}
// SetReceiptsIdle sets the peer to idle, allowing it to execute new retrieval requests.
// Its receipt retrieval allowance will also be updated either up- or downwards,
// depending on whether the previous fetch completed in time or not.
// depending on whether the previous fetch completed in time.
func (p *peer) SetReceiptsIdle() {
p.setIdle(p.receiptStarted, receiptSoftTTL, receiptHardTTL, MaxReceiptFetch, &p.receiptCapacity, &p.receiptIdle)
}
// SetNodeDataIdle sets the peer to idle, allowing it to execute new retrieval
// requests. Its node data retrieval allowance will also be updated either up- or
// downwards, depending on whether the previous fetch completed in time or not.
// downwards, depending on whether the previous fetch completed in time.
func (p *peer) SetNodeDataIdle() {
p.setIdle(p.stateStarted, stateSoftTTL, stateSoftTTL, MaxStateFetch, &p.stateCapacity, &p.stateIdle)
}
// setIdle sets the peer to idle, allowing it to execute new retrieval requests.
// Its data retrieval allowance will also be updated either up- or downwards,
// depending on whether the previous fetch completed in time or not.
// depending on whether the previous fetch completed in time.
func (p *peer) setIdle(started time.Time, softTTL, hardTTL time.Duration, maxFetch int, capacity, idle *int32) {
// Update the peer's download allowance based on previous performance
scale := 2.0

55
eth/downloader/queue.go
View file

@ -56,9 +56,8 @@ type fetchRequest struct {
Time time.Time // Time when the request was made
}
// fetchResult is the assembly collecting partial results from potentially more
// than one fetcher routines, until all outstanding retrievals complete and the
// result as a whole can be processed.
// fetchResult is a struct collecting partial results from data fetchers until
// all outstanding pieces complete and the result as a whole can be processed.
type fetchResult struct {
Pending int // Number of data fetches still pending
@ -89,7 +88,7 @@ type queue struct {
receiptPendPool map[string]*fetchRequest // [eth/63] Currently pending receipt retrieval operations
receiptDonePool map[common.Hash]struct{} // [eth/63] Set of the completed receipt fetches
stateTaskIndex int // [eth/63] Counter indexing the added hashes to ensure prioritized retrieval order
stateTaskIndex int // [eth/63] Counter indexing the added hashes to ensure prioritised retrieval order
stateTaskPool map[common.Hash]int // [eth/63] Pending node data retrieval tasks, mapping to their priority
stateTaskQueue *prque.Prque // [eth/63] Priority queue of the hashes to fetch the node data for
statePendPool map[string]*fetchRequest // [eth/63] Currently pending node data retrieval operations
@ -97,10 +96,10 @@ type queue struct {
stateDatabase ethdb.Database // [eth/63] Trie database to populate during state reassembly
stateScheduler *state.StateSync // [eth/63] State trie synchronisation scheduler and integrator
stateProcessors int32 // [eth/63] Number of currently running state processors
stateSchedLock sync.RWMutex // [eth/63] Lock serializing access to the state scheduler
stateSchedLock sync.RWMutex // [eth/63] Lock serialising access to the state scheduler
resultCache []*fetchResult // Downloaded but not yet delivered fetch results
resultOffset uint64 // Offset of the first cached fetch result in the block-chain
resultOffset uint64 // Offset of the first cached fetch result in the block chain
lock sync.RWMutex
}
@ -233,9 +232,9 @@ func (q *queue) Idle() bool {
return (queued + pending + cached) == 0
}
// ThrottleBlocks checks if the download should be throttled (active block (body)
// ShouldThrottleBlocks checks if the download should be throttled (active block (body)
// fetches exceed block cache).
func (q *queue) ThrottleBlocks() bool {
func (q *queue) ShouldThrottleBlocks() bool {
q.lock.RLock()
defer q.lock.RUnlock()
@ -248,9 +247,9 @@ func (q *queue) ThrottleBlocks() bool {
return pending >= len(q.resultCache)-len(q.blockDonePool)
}
// ThrottleReceipts checks if the download should be throttled (active receipt
// ShouldThrottleReceipts checks if the download should be throttled (active receipt
// fetches exceed block cache).
func (q *queue) ThrottleReceipts() bool {
func (q *queue) ShouldThrottleReceipts() bool {
q.lock.RLock()
defer q.lock.RUnlock()
@ -269,7 +268,7 @@ func (q *queue) Schedule61(hashes []common.Hash, fifo bool) []common.Hash {
q.lock.Lock()
defer q.lock.Unlock()
// Insert all the hashes prioritized in the arrival order
// Insert all the hashes prioritised in the arrival order
inserts := make([]common.Hash, 0, len(hashes))
for _, hash := range hashes {
// Skip anything we already have
@ -297,10 +296,10 @@ func (q *queue) Schedule(headers []*types.Header, from uint64) []*types.Header {
q.lock.Lock()
defer q.lock.Unlock()
// Insert all the headers prioritized by the contained block number
// Insert all the headers prioritised by the contained block number
inserts := make([]*types.Header, 0, len(headers))
for _, header := range headers {
// Make sure chain order is honored and preserved throughout
// Make sure chain order is honoured and preserved throughout
hash := header.Hash()
if header.Number == nil || header.Number.Uint64() != from {
glog.V(logger.Warn).Infof("Header #%v [%x] broke chain ordering, expected %d", header.Number, hash[:4], from)
@ -439,8 +438,8 @@ func (q *queue) reserveHashes(p *peer, count int, taskQueue *prque.Prque, taskGe
q.lock.Lock()
defer q.lock.Unlock()
// Short circuit if the peer's already downloading something (sanity check not
// to corrupt state)
// Short circuit if the peer's already downloading something (sanity check to
// not corrupt state)
if _, ok := pendPool[p.id]; ok {
return nil
}
@ -492,27 +491,27 @@ func (q *queue) reserveHashes(p *peer, count int, taskQueue *prque.Prque, taskGe
// previously failed downloads. Beside the next batch of needed fetches, it also
// returns a flag whether empty blocks were queued requiring processing.
func (q *queue) ReserveBodies(p *peer, count int) (*fetchRequest, bool, error) {
noop := func(header *types.Header) bool {
isNoop := func(header *types.Header) bool {
return header.TxHash == types.EmptyRootHash && header.UncleHash == types.EmptyUncleHash
}
return q.reserveHeaders(p, count, q.blockTaskPool, q.blockTaskQueue, q.blockPendPool, q.blockDonePool, noop)
return q.reserveHeaders(p, count, q.blockTaskPool, q.blockTaskQueue, q.blockPendPool, q.blockDonePool, isNoop)
}
// ReserveReceipts reserves a set of receipt fetches for the given peer, skipping
// any previously failed downloads. Beside the next batch of needed fetches, it
// also returns a flag whether empty receipts were queued requiring importing.
func (q *queue) ReserveReceipts(p *peer, count int) (*fetchRequest, bool, error) {
noop := func(header *types.Header) bool {
isNoop := func(header *types.Header) bool {
return header.ReceiptHash == types.EmptyRootHash
}
return q.reserveHeaders(p, count, q.receiptTaskPool, q.receiptTaskQueue, q.receiptPendPool, q.receiptDonePool, noop)
return q.reserveHeaders(p, count, q.receiptTaskPool, q.receiptTaskQueue, q.receiptPendPool, q.receiptDonePool, isNoop)
}
// reserveHeaders reserves a set of data download operations for a given peer,
// skipping any previously failed ones. This method is a generic version used
// by the individual special reservation functions.
func (q *queue) reserveHeaders(p *peer, count int, taskPool map[common.Hash]*types.Header, taskQueue *prque.Prque,
pendPool map[string]*fetchRequest, donePool map[common.Hash]struct{}, noop func(*types.Header) bool) (*fetchRequest, bool, error) {
pendPool map[string]*fetchRequest, donePool map[common.Hash]struct{}, isNoop func(*types.Header) bool) (*fetchRequest, bool, error) {
q.lock.Lock()
defer q.lock.Unlock()
@ -537,7 +536,7 @@ func (q *queue) reserveHeaders(p *peer, count int, taskPool map[common.Hash]*typ
for proc := 0; proc < space && len(send) < count && !taskQueue.Empty(); proc++ {
header := taskQueue.PopItem().(*types.Header)
// If we're the first to request this task, initialize the result container
// If we're the first to request this task, initialise the result container
index := int(header.Number.Int64() - int64(q.resultOffset))
if index >= len(q.resultCache) || index < 0 {
return nil, false, errInvalidChain
@ -553,7 +552,7 @@ func (q *queue) reserveHeaders(p *peer, count int, taskPool map[common.Hash]*typ
}
}
// If this fetch task is a noop, skip this fetch operation
if noop(header) {
if isNoop(header) {
donePool[header.Hash()] = struct{}{}
delete(taskPool, header.Hash())
@ -562,7 +561,7 @@ func (q *queue) reserveHeaders(p *peer, count int, taskPool map[common.Hash]*typ
progress = true
continue
}
// Otherwise if not a known unknown block, add to the retrieve list
// Otherwise unless the peer is known not to have the data, add to the retrieve list
if p.ignored.Has(header.Hash()) {
skip = append(skip, header)
} else {
@ -655,25 +654,25 @@ func (q *queue) Revoke(peerId string) {
}
// ExpireBlocks checks for in flight requests that exceeded a timeout allowance,
// canceling them and returning the responsible peers for penalization.
// canceling them and returning the responsible peers for penalisation.
func (q *queue) ExpireBlocks(timeout time.Duration) []string {
return q.expire(timeout, q.blockPendPool, q.hashQueue, blockTimeoutMeter)
}
// ExpireBodies checks for in flight block body requests that exceeded a timeout
// allowance, canceling them and returning the responsible peers for penalization.
// allowance, canceling them and returning the responsible peers for penalisation.
func (q *queue) ExpireBodies(timeout time.Duration) []string {
return q.expire(timeout, q.blockPendPool, q.blockTaskQueue, bodyTimeoutMeter)
}
// ExpireReceipts checks for in flight receipt requests that exceeded a timeout
// allowance, canceling them and returning the responsible peers for penalization.
// allowance, canceling them and returning the responsible peers for penalisation.
func (q *queue) ExpireReceipts(timeout time.Duration) []string {
return q.expire(timeout, q.receiptPendPool, q.receiptTaskQueue, receiptTimeoutMeter)
}
// ExpireNodeData checks for in flight node data requests that exceeded a timeout
// allowance, canceling them and returning the responsible peers for penalization.
// allowance, canceling them and returning the responsible peers for penalisation.
func (q *queue) ExpireNodeData(timeout time.Duration) []string {
return q.expire(timeout, q.statePendPool, q.stateTaskQueue, stateTimeoutMeter)
}
@ -876,7 +875,7 @@ func (q *queue) DeliverNodeData(id string, data [][]byte, callback func(error, i
stateReqTimer.UpdateSince(request.Time)
delete(q.statePendPool, id)
// If no data was retrieved, mark them as unavailable for the origin peer
// If no data was retrieved, mark their hashes as unavailable for the origin peer
if len(data) == 0 {
for hash, _ := range request.Hashes {
request.Peer.ignored.Add(hash)

2
eth/handler.go
View file

@ -103,7 +103,7 @@ func NewProtocolManager(fastSync bool, networkId int, mux *event.TypeMux, txpool
if fastSync && version < eth63 {
continue
}
// Compatible, initialize the sub-protocol
// Compatible; initialise the sub-protocol
version := version // Closure for the run
manager.SubProtocols = append(manager.SubProtocols, p2p.Protocol{
Name: "eth",

2
trie/sync.go
View file

@ -31,7 +31,7 @@ type request struct {
object *node // Target node to populate with retrieved data (hashnode originally)
parents []*request // Parent state nodes referencing this entry (notify all upon completion)
depth int // Depth level within the trie the node is located to prioritize DFS
depth int // Depth level within the trie the node is located to prioritise DFS
deps int // Number of dependencies before allowed to commit this node
callback TrieSyncLeafCallback // Callback to invoke if a leaf node it reached on this branch