mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-22 11:31:02 +00:00
695 lines
19 KiB
Go
695 lines
19 KiB
Go
// Copyright 2016 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 storage
|
|
|
|
import (
|
|
"context"
|
|
"encoding/binary"
|
|
"errors"
|
|
"io"
|
|
"io/ioutil"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/swarm/chunk"
|
|
"github.com/ethereum/go-ethereum/swarm/log"
|
|
)
|
|
|
|
/*
|
|
The main idea of a pyramid chunker is to process the input data without knowing the entire size apriori.
|
|
For this to be achieved, the chunker tree is built from the ground up until the data is exhausted.
|
|
This opens up new aveneus such as easy append and other sort of modifications to the tree thereby avoiding
|
|
duplication of data chunks.
|
|
|
|
|
|
Below is an example of a two level chunks tree. The leaf chunks are called data chunks and all the above
|
|
chunks are called tree chunks. The tree chunk above data chunks is level 0 and so on until it reaches
|
|
the root tree chunk.
|
|
|
|
|
|
|
|
T10 <- Tree chunk lvl1
|
|
|
|
|
__________________________|_____________________________
|
|
/ | | \
|
|
/ | \ \
|
|
__T00__ ___T01__ ___T02__ ___T03__ <- Tree chunks lvl 0
|
|
/ / \ / / \ / / \ / / \
|
|
/ / \ / / \ / / \ / / \
|
|
D1 D2 ... D128 D1 D2 ... D128 D1 D2 ... D128 D1 D2 ... D128 <- Data Chunks
|
|
|
|
|
|
The split function continuously read the data and creates data chunks and send them to storage.
|
|
When certain no of data chunks are created (defaultBranches), a signal is sent to create a tree
|
|
entry. When the level 0 tree entries reaches certain threshold (defaultBranches), another signal
|
|
is sent to a tree entry one level up.. and so on... until only the data is exhausted AND only one
|
|
tree entry is present in certain level. The key of tree entry is given out as the rootAddress of the file.
|
|
|
|
*/
|
|
|
|
var (
|
|
errLoadingTreeRootChunk = errors.New("LoadTree Error: Could not load root chunk")
|
|
errLoadingTreeChunk = errors.New("LoadTree Error: Could not load chunk")
|
|
)
|
|
|
|
const (
|
|
ChunkProcessors = 8
|
|
splitTimeout = time.Minute * 5
|
|
)
|
|
|
|
type PyramidSplitterParams struct {
|
|
SplitterParams
|
|
getter Getter
|
|
}
|
|
|
|
func NewPyramidSplitterParams(addr Address, reader io.Reader, putter Putter, getter Getter, chunkSize int64) *PyramidSplitterParams {
|
|
hashSize := putter.RefSize()
|
|
return &PyramidSplitterParams{
|
|
SplitterParams: SplitterParams{
|
|
ChunkerParams: ChunkerParams{
|
|
chunkSize: chunkSize,
|
|
hashSize: hashSize,
|
|
},
|
|
reader: reader,
|
|
putter: putter,
|
|
addr: addr,
|
|
},
|
|
getter: getter,
|
|
}
|
|
}
|
|
|
|
/*
|
|
When splitting, data is given as a SectionReader, and the key is a hashSize long byte slice (Address), the root hash of the entire content will fill this once processing finishes.
|
|
New chunks to store are store using the putter which the caller provides.
|
|
*/
|
|
func PyramidSplit(ctx context.Context, reader io.Reader, putter Putter, getter Getter) (Address, func(context.Context) error, error) {
|
|
return NewPyramidSplitter(NewPyramidSplitterParams(nil, reader, putter, getter, chunk.DefaultSize)).Split(ctx)
|
|
}
|
|
|
|
func PyramidAppend(ctx context.Context, addr Address, reader io.Reader, putter Putter, getter Getter) (Address, func(context.Context) error, error) {
|
|
return NewPyramidSplitter(NewPyramidSplitterParams(addr, reader, putter, getter, chunk.DefaultSize)).Append(ctx)
|
|
}
|
|
|
|
// Entry to create a tree node
|
|
type TreeEntry struct {
|
|
level int
|
|
branchCount int64
|
|
subtreeSize uint64
|
|
chunk []byte
|
|
key []byte
|
|
index int // used in append to indicate the index of existing tree entry
|
|
updatePending bool // indicates if the entry is loaded from existing tree
|
|
}
|
|
|
|
func NewTreeEntry(pyramid *PyramidChunker) *TreeEntry {
|
|
return &TreeEntry{
|
|
level: 0,
|
|
branchCount: 0,
|
|
subtreeSize: 0,
|
|
chunk: make([]byte, pyramid.chunkSize+8),
|
|
key: make([]byte, pyramid.hashSize),
|
|
index: 0,
|
|
updatePending: false,
|
|
}
|
|
}
|
|
|
|
// Used by the hash processor to create a data/tree chunk and send to storage
|
|
type chunkJob struct {
|
|
key Address
|
|
chunk []byte
|
|
parentWg *sync.WaitGroup
|
|
}
|
|
|
|
type PyramidChunker struct {
|
|
chunkSize int64
|
|
hashSize int64
|
|
branches int64
|
|
reader io.Reader
|
|
putter Putter
|
|
getter Getter
|
|
key Address
|
|
workerCount int64
|
|
workerLock sync.RWMutex
|
|
jobC chan *chunkJob
|
|
wg *sync.WaitGroup
|
|
errC chan error
|
|
quitC chan bool
|
|
rootAddress []byte
|
|
chunkLevel [][]*TreeEntry
|
|
}
|
|
|
|
func NewPyramidSplitter(params *PyramidSplitterParams) (pc *PyramidChunker) {
|
|
pc = &PyramidChunker{}
|
|
pc.reader = params.reader
|
|
pc.hashSize = params.hashSize
|
|
pc.branches = params.chunkSize / pc.hashSize
|
|
pc.chunkSize = pc.hashSize * pc.branches
|
|
pc.putter = params.putter
|
|
pc.getter = params.getter
|
|
pc.key = params.addr
|
|
pc.workerCount = 0
|
|
pc.jobC = make(chan *chunkJob, 2*ChunkProcessors)
|
|
pc.wg = &sync.WaitGroup{}
|
|
pc.errC = make(chan error)
|
|
pc.quitC = make(chan bool)
|
|
pc.rootAddress = make([]byte, pc.hashSize)
|
|
pc.chunkLevel = make([][]*TreeEntry, pc.branches)
|
|
return
|
|
}
|
|
|
|
func (pc *PyramidChunker) Join(addr Address, getter Getter, depth int) LazySectionReader {
|
|
return &LazyChunkReader{
|
|
addr: addr,
|
|
depth: depth,
|
|
chunkSize: pc.chunkSize,
|
|
branches: pc.branches,
|
|
hashSize: pc.hashSize,
|
|
getter: getter,
|
|
}
|
|
}
|
|
|
|
func (pc *PyramidChunker) incrementWorkerCount() {
|
|
pc.workerLock.Lock()
|
|
defer pc.workerLock.Unlock()
|
|
pc.workerCount += 1
|
|
}
|
|
|
|
func (pc *PyramidChunker) getWorkerCount() int64 {
|
|
pc.workerLock.Lock()
|
|
defer pc.workerLock.Unlock()
|
|
return pc.workerCount
|
|
}
|
|
|
|
func (pc *PyramidChunker) decrementWorkerCount() {
|
|
pc.workerLock.Lock()
|
|
defer pc.workerLock.Unlock()
|
|
pc.workerCount -= 1
|
|
}
|
|
|
|
func (pc *PyramidChunker) Split(ctx context.Context) (k Address, wait func(context.Context) error, err error) {
|
|
pc.wg.Add(1)
|
|
pc.prepareChunks(ctx, false)
|
|
|
|
// closes internal error channel if all subprocesses in the workgroup finished
|
|
go func() {
|
|
|
|
// waiting for all chunks to finish
|
|
pc.wg.Wait()
|
|
|
|
//We close errC here because this is passed down to 8 parallel routines underneath.
|
|
// if a error happens in one of them.. that particular routine raises error...
|
|
// once they all complete successfully, the control comes back and we can safely close this here.
|
|
close(pc.errC)
|
|
}()
|
|
|
|
defer close(pc.quitC)
|
|
defer pc.putter.Close()
|
|
|
|
select {
|
|
case err := <-pc.errC:
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
case <-ctx.Done():
|
|
_ = pc.putter.Wait(ctx) //???
|
|
return nil, nil, ctx.Err()
|
|
}
|
|
return pc.rootAddress, pc.putter.Wait, nil
|
|
|
|
}
|
|
|
|
func (pc *PyramidChunker) Append(ctx context.Context) (k Address, wait func(context.Context) error, err error) {
|
|
// Load the right most unfinished tree chunks in every level
|
|
pc.loadTree(ctx)
|
|
|
|
pc.wg.Add(1)
|
|
pc.prepareChunks(ctx, true)
|
|
|
|
// closes internal error channel if all subprocesses in the workgroup finished
|
|
go func() {
|
|
|
|
// waiting for all chunks to finish
|
|
pc.wg.Wait()
|
|
|
|
close(pc.errC)
|
|
}()
|
|
|
|
defer close(pc.quitC)
|
|
defer pc.putter.Close()
|
|
|
|
select {
|
|
case err := <-pc.errC:
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
case <-time.NewTimer(splitTimeout).C:
|
|
}
|
|
|
|
return pc.rootAddress, pc.putter.Wait, nil
|
|
|
|
}
|
|
|
|
func (pc *PyramidChunker) processor(ctx context.Context, id int64) {
|
|
defer pc.decrementWorkerCount()
|
|
for {
|
|
select {
|
|
|
|
case job, ok := <-pc.jobC:
|
|
if !ok {
|
|
return
|
|
}
|
|
pc.processChunk(ctx, id, job)
|
|
case <-pc.quitC:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (pc *PyramidChunker) processChunk(ctx context.Context, id int64, job *chunkJob) {
|
|
ref, err := pc.putter.Put(ctx, job.chunk)
|
|
if err != nil {
|
|
select {
|
|
case pc.errC <- err:
|
|
case <-pc.quitC:
|
|
}
|
|
}
|
|
|
|
// report hash of this chunk one level up (keys corresponds to the proper subslice of the parent chunk)
|
|
copy(job.key, ref)
|
|
|
|
// send off new chunk to storage
|
|
job.parentWg.Done()
|
|
}
|
|
|
|
func (pc *PyramidChunker) loadTree(ctx context.Context) error {
|
|
// Get the root chunk to get the total size
|
|
chunkData, err := pc.getter.Get(ctx, Reference(pc.key))
|
|
if err != nil {
|
|
return errLoadingTreeRootChunk
|
|
}
|
|
chunkSize := int64(chunkData.Size())
|
|
log.Trace("pyramid.chunker: root chunk", "chunk.Size", chunkSize, "pc.chunkSize", pc.chunkSize)
|
|
|
|
//if data size is less than a chunk... add a parent with update as pending
|
|
if chunkSize <= pc.chunkSize {
|
|
newEntry := &TreeEntry{
|
|
level: 0,
|
|
branchCount: 1,
|
|
subtreeSize: uint64(chunkSize),
|
|
chunk: make([]byte, pc.chunkSize+8),
|
|
key: make([]byte, pc.hashSize),
|
|
index: 0,
|
|
updatePending: true,
|
|
}
|
|
copy(newEntry.chunk[8:], pc.key)
|
|
pc.chunkLevel[0] = append(pc.chunkLevel[0], newEntry)
|
|
return nil
|
|
}
|
|
|
|
var treeSize int64
|
|
var depth int
|
|
treeSize = pc.chunkSize
|
|
for ; treeSize < chunkSize; treeSize *= pc.branches {
|
|
depth++
|
|
}
|
|
log.Trace("pyramid.chunker", "depth", depth)
|
|
|
|
// Add the root chunk entry
|
|
branchCount := int64(len(chunkData)-8) / pc.hashSize
|
|
newEntry := &TreeEntry{
|
|
level: depth - 1,
|
|
branchCount: branchCount,
|
|
subtreeSize: uint64(chunkSize),
|
|
chunk: chunkData,
|
|
key: pc.key,
|
|
index: 0,
|
|
updatePending: true,
|
|
}
|
|
pc.chunkLevel[depth-1] = append(pc.chunkLevel[depth-1], newEntry)
|
|
|
|
// Add the rest of the tree
|
|
for lvl := depth - 1; lvl >= 1; lvl-- {
|
|
|
|
//TODO(jmozah): instead of loading finished branches and then trim in the end,
|
|
//avoid loading them in the first place
|
|
for _, ent := range pc.chunkLevel[lvl] {
|
|
branchCount = int64(len(ent.chunk)-8) / pc.hashSize
|
|
for i := int64(0); i < branchCount; i++ {
|
|
key := ent.chunk[8+(i*pc.hashSize) : 8+((i+1)*pc.hashSize)]
|
|
newChunkData, err := pc.getter.Get(ctx, Reference(key))
|
|
if err != nil {
|
|
return errLoadingTreeChunk
|
|
}
|
|
newChunkSize := newChunkData.Size()
|
|
bewBranchCount := int64(len(newChunkData)-8) / pc.hashSize
|
|
newEntry := &TreeEntry{
|
|
level: lvl - 1,
|
|
branchCount: bewBranchCount,
|
|
subtreeSize: newChunkSize,
|
|
chunk: newChunkData,
|
|
key: key,
|
|
index: 0,
|
|
updatePending: true,
|
|
}
|
|
pc.chunkLevel[lvl-1] = append(pc.chunkLevel[lvl-1], newEntry)
|
|
|
|
}
|
|
|
|
// We need to get only the right most unfinished branch.. so trim all finished branches
|
|
if int64(len(pc.chunkLevel[lvl-1])) >= pc.branches {
|
|
pc.chunkLevel[lvl-1] = nil
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (pc *PyramidChunker) prepareChunks(ctx context.Context, isAppend bool) {
|
|
defer pc.wg.Done()
|
|
|
|
chunkWG := &sync.WaitGroup{}
|
|
|
|
pc.incrementWorkerCount()
|
|
|
|
go pc.processor(ctx, pc.workerCount)
|
|
|
|
parent := NewTreeEntry(pc)
|
|
var unfinishedChunkData ChunkData
|
|
var unfinishedChunkSize uint64
|
|
|
|
if isAppend && len(pc.chunkLevel[0]) != 0 {
|
|
lastIndex := len(pc.chunkLevel[0]) - 1
|
|
ent := pc.chunkLevel[0][lastIndex]
|
|
|
|
if ent.branchCount < pc.branches {
|
|
parent = &TreeEntry{
|
|
level: 0,
|
|
branchCount: ent.branchCount,
|
|
subtreeSize: ent.subtreeSize,
|
|
chunk: ent.chunk,
|
|
key: ent.key,
|
|
index: lastIndex,
|
|
updatePending: true,
|
|
}
|
|
|
|
lastBranch := parent.branchCount - 1
|
|
lastAddress := parent.chunk[8+lastBranch*pc.hashSize : 8+(lastBranch+1)*pc.hashSize]
|
|
|
|
var err error
|
|
unfinishedChunkData, err = pc.getter.Get(ctx, lastAddress)
|
|
if err != nil {
|
|
pc.errC <- err
|
|
}
|
|
unfinishedChunkSize = unfinishedChunkData.Size()
|
|
if unfinishedChunkSize < uint64(pc.chunkSize) {
|
|
parent.subtreeSize = parent.subtreeSize - unfinishedChunkSize
|
|
parent.branchCount = parent.branchCount - 1
|
|
} else {
|
|
unfinishedChunkData = nil
|
|
}
|
|
}
|
|
}
|
|
|
|
for index := 0; ; index++ {
|
|
var err error
|
|
chunkData := make([]byte, pc.chunkSize+8)
|
|
|
|
var readBytes int
|
|
|
|
if unfinishedChunkData != nil {
|
|
copy(chunkData, unfinishedChunkData)
|
|
readBytes += int(unfinishedChunkSize)
|
|
unfinishedChunkData = nil
|
|
log.Trace("pyramid.chunker: found unfinished chunk", "readBytes", readBytes)
|
|
}
|
|
|
|
var res []byte
|
|
res, err = ioutil.ReadAll(io.LimitReader(pc.reader, int64(len(chunkData)-(8+readBytes))))
|
|
|
|
// hack for ioutil.ReadAll:
|
|
// a successful call to ioutil.ReadAll returns err == nil, not err == EOF, whereas we
|
|
// want to propagate the io.EOF error
|
|
if len(res) == 0 && err == nil {
|
|
err = io.EOF
|
|
}
|
|
copy(chunkData[8+readBytes:], res)
|
|
|
|
readBytes += len(res)
|
|
log.Trace("pyramid.chunker: copied all data", "readBytes", readBytes)
|
|
|
|
if err != nil {
|
|
if err == io.EOF || err == io.ErrUnexpectedEOF {
|
|
|
|
pc.cleanChunkLevels()
|
|
|
|
// Check if we are appending or the chunk is the only one.
|
|
if parent.branchCount == 1 && (pc.depth() == 0 || isAppend) {
|
|
// Data is exactly one chunk.. pick the last chunk key as root
|
|
chunkWG.Wait()
|
|
lastChunksAddress := parent.chunk[8 : 8+pc.hashSize]
|
|
copy(pc.rootAddress, lastChunksAddress)
|
|
break
|
|
}
|
|
} else {
|
|
close(pc.quitC)
|
|
break
|
|
}
|
|
}
|
|
|
|
// Data ended in chunk boundary.. just signal to start bulding tree
|
|
if readBytes == 0 {
|
|
pc.buildTree(isAppend, parent, chunkWG, true, nil)
|
|
break
|
|
} else {
|
|
pkey := pc.enqueueDataChunk(chunkData, uint64(readBytes), parent, chunkWG)
|
|
|
|
// update tree related parent data structures
|
|
parent.subtreeSize += uint64(readBytes)
|
|
parent.branchCount++
|
|
|
|
// Data got exhausted... signal to send any parent tree related chunks
|
|
if int64(readBytes) < pc.chunkSize {
|
|
|
|
pc.cleanChunkLevels()
|
|
|
|
// only one data chunk .. so dont add any parent chunk
|
|
if parent.branchCount <= 1 {
|
|
chunkWG.Wait()
|
|
|
|
if isAppend || pc.depth() == 0 {
|
|
// No need to build the tree if the depth is 0
|
|
// or we are appending.
|
|
// Just use the last key.
|
|
copy(pc.rootAddress, pkey)
|
|
} else {
|
|
// We need to build the tree and and provide the lonely
|
|
// chunk key to replace the last tree chunk key.
|
|
pc.buildTree(isAppend, parent, chunkWG, true, pkey)
|
|
}
|
|
break
|
|
}
|
|
|
|
pc.buildTree(isAppend, parent, chunkWG, true, nil)
|
|
break
|
|
}
|
|
|
|
if parent.branchCount == pc.branches {
|
|
pc.buildTree(isAppend, parent, chunkWG, false, nil)
|
|
parent = NewTreeEntry(pc)
|
|
}
|
|
|
|
}
|
|
|
|
workers := pc.getWorkerCount()
|
|
if int64(len(pc.jobC)) > workers && workers < ChunkProcessors {
|
|
pc.incrementWorkerCount()
|
|
go pc.processor(ctx, pc.workerCount)
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
func (pc *PyramidChunker) buildTree(isAppend bool, ent *TreeEntry, chunkWG *sync.WaitGroup, last bool, lonelyChunkKey []byte) {
|
|
chunkWG.Wait()
|
|
pc.enqueueTreeChunk(ent, chunkWG, last)
|
|
|
|
compress := false
|
|
endLvl := pc.branches
|
|
for lvl := int64(0); lvl < pc.branches; lvl++ {
|
|
lvlCount := int64(len(pc.chunkLevel[lvl]))
|
|
if lvlCount >= pc.branches {
|
|
endLvl = lvl + 1
|
|
compress = true
|
|
break
|
|
}
|
|
}
|
|
|
|
if !compress && !last {
|
|
return
|
|
}
|
|
|
|
// Wait for all the keys to be processed before compressing the tree
|
|
chunkWG.Wait()
|
|
|
|
for lvl := int64(ent.level); lvl < endLvl; lvl++ {
|
|
|
|
lvlCount := int64(len(pc.chunkLevel[lvl]))
|
|
if lvlCount == 1 && last {
|
|
copy(pc.rootAddress, pc.chunkLevel[lvl][0].key)
|
|
return
|
|
}
|
|
|
|
for startCount := int64(0); startCount < lvlCount; startCount += pc.branches {
|
|
|
|
endCount := startCount + pc.branches
|
|
if endCount > lvlCount {
|
|
endCount = lvlCount
|
|
}
|
|
|
|
var nextLvlCount int64
|
|
var tempEntry *TreeEntry
|
|
if len(pc.chunkLevel[lvl+1]) > 0 {
|
|
nextLvlCount = int64(len(pc.chunkLevel[lvl+1]) - 1)
|
|
tempEntry = pc.chunkLevel[lvl+1][nextLvlCount]
|
|
}
|
|
if isAppend && tempEntry != nil && tempEntry.updatePending {
|
|
updateEntry := &TreeEntry{
|
|
level: int(lvl + 1),
|
|
branchCount: 0,
|
|
subtreeSize: 0,
|
|
chunk: make([]byte, pc.chunkSize+8),
|
|
key: make([]byte, pc.hashSize),
|
|
index: int(nextLvlCount),
|
|
updatePending: true,
|
|
}
|
|
for index := int64(0); index < lvlCount; index++ {
|
|
updateEntry.branchCount++
|
|
updateEntry.subtreeSize += pc.chunkLevel[lvl][index].subtreeSize
|
|
copy(updateEntry.chunk[8+(index*pc.hashSize):8+((index+1)*pc.hashSize)], pc.chunkLevel[lvl][index].key[:pc.hashSize])
|
|
}
|
|
|
|
pc.enqueueTreeChunk(updateEntry, chunkWG, last)
|
|
|
|
} else {
|
|
|
|
noOfBranches := endCount - startCount
|
|
newEntry := &TreeEntry{
|
|
level: int(lvl + 1),
|
|
branchCount: noOfBranches,
|
|
subtreeSize: 0,
|
|
chunk: make([]byte, (noOfBranches*pc.hashSize)+8),
|
|
key: make([]byte, pc.hashSize),
|
|
index: int(nextLvlCount),
|
|
updatePending: false,
|
|
}
|
|
|
|
index := int64(0)
|
|
for i := startCount; i < endCount; i++ {
|
|
entry := pc.chunkLevel[lvl][i]
|
|
newEntry.subtreeSize += entry.subtreeSize
|
|
copy(newEntry.chunk[8+(index*pc.hashSize):8+((index+1)*pc.hashSize)], entry.key[:pc.hashSize])
|
|
index++
|
|
}
|
|
// Lonely chunk key is the key of the last chunk that is only one on the last branch.
|
|
// In this case, ignore the its tree chunk key and replace it with the lonely chunk key.
|
|
if lonelyChunkKey != nil {
|
|
// Overwrite the last tree chunk key with the lonely data chunk key.
|
|
copy(newEntry.chunk[int64(len(newEntry.chunk))-pc.hashSize:], lonelyChunkKey[:pc.hashSize])
|
|
}
|
|
|
|
pc.enqueueTreeChunk(newEntry, chunkWG, last)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if !isAppend {
|
|
chunkWG.Wait()
|
|
if compress {
|
|
pc.chunkLevel[lvl] = nil
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
func (pc *PyramidChunker) enqueueTreeChunk(ent *TreeEntry, chunkWG *sync.WaitGroup, last bool) {
|
|
if ent != nil && ent.branchCount > 0 {
|
|
|
|
// wait for data chunks to get over before processing the tree chunk
|
|
if last {
|
|
chunkWG.Wait()
|
|
}
|
|
|
|
binary.LittleEndian.PutUint64(ent.chunk[:8], ent.subtreeSize)
|
|
ent.key = make([]byte, pc.hashSize)
|
|
chunkWG.Add(1)
|
|
select {
|
|
case pc.jobC <- &chunkJob{ent.key, ent.chunk[:ent.branchCount*pc.hashSize+8], chunkWG}:
|
|
case <-pc.quitC:
|
|
}
|
|
|
|
// Update or append based on weather it is a new entry or being reused
|
|
if ent.updatePending {
|
|
chunkWG.Wait()
|
|
pc.chunkLevel[ent.level][ent.index] = ent
|
|
} else {
|
|
pc.chunkLevel[ent.level] = append(pc.chunkLevel[ent.level], ent)
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
func (pc *PyramidChunker) enqueueDataChunk(chunkData []byte, size uint64, parent *TreeEntry, chunkWG *sync.WaitGroup) Address {
|
|
binary.LittleEndian.PutUint64(chunkData[:8], size)
|
|
pkey := parent.chunk[8+parent.branchCount*pc.hashSize : 8+(parent.branchCount+1)*pc.hashSize]
|
|
|
|
chunkWG.Add(1)
|
|
select {
|
|
case pc.jobC <- &chunkJob{pkey, chunkData[:size+8], chunkWG}:
|
|
case <-pc.quitC:
|
|
}
|
|
|
|
return pkey
|
|
|
|
}
|
|
|
|
// depth returns the number of chunk levels.
|
|
// It is used to detect if there is only one data chunk
|
|
// left for the last branch.
|
|
func (pc *PyramidChunker) depth() (d int) {
|
|
for _, l := range pc.chunkLevel {
|
|
if l == nil {
|
|
return
|
|
}
|
|
d++
|
|
}
|
|
return
|
|
}
|
|
|
|
// cleanChunkLevels removes gaps (nil levels) between chunk levels
|
|
// that are not nil.
|
|
func (pc *PyramidChunker) cleanChunkLevels() {
|
|
for i, l := range pc.chunkLevel {
|
|
if l == nil {
|
|
pc.chunkLevel = append(pc.chunkLevel[:i], append(pc.chunkLevel[i+1:], nil)...)
|
|
}
|
|
}
|
|
}
|