mirror of https://github.com/status-im/op-geth.git
638 lines
18 KiB
Go
638 lines
18 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 (
|
|
"encoding/binary"
|
|
"errors"
|
|
"io"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
/*
|
|
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 rootKey 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
|
|
DefaultBranches int64 = 128
|
|
splitTimeout = time.Minute * 5
|
|
)
|
|
|
|
const (
|
|
DataChunk = 0
|
|
TreeChunk = 1
|
|
)
|
|
|
|
type ChunkerParams struct {
|
|
Branches int64
|
|
Hash string
|
|
}
|
|
|
|
func NewChunkerParams() *ChunkerParams {
|
|
return &ChunkerParams{
|
|
Branches: DefaultBranches,
|
|
Hash: SHA3Hash,
|
|
}
|
|
}
|
|
|
|
// 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 Key
|
|
chunk []byte
|
|
size int64
|
|
parentWg *sync.WaitGroup
|
|
chunkType int // used to identify the tree related chunks for debugging
|
|
chunkLvl int // leaf-1 is level 0 and goes upwards until it reaches root
|
|
}
|
|
|
|
type PyramidChunker struct {
|
|
hashFunc SwarmHasher
|
|
chunkSize int64
|
|
hashSize int64
|
|
branches int64
|
|
workerCount int64
|
|
workerLock sync.RWMutex
|
|
}
|
|
|
|
func NewPyramidChunker(params *ChunkerParams) (self *PyramidChunker) {
|
|
self = &PyramidChunker{}
|
|
self.hashFunc = MakeHashFunc(params.Hash)
|
|
self.branches = params.Branches
|
|
self.hashSize = int64(self.hashFunc().Size())
|
|
self.chunkSize = self.hashSize * self.branches
|
|
self.workerCount = 0
|
|
return
|
|
}
|
|
|
|
func (self *PyramidChunker) Join(key Key, chunkC chan *Chunk) LazySectionReader {
|
|
return &LazyChunkReader{
|
|
key: key,
|
|
chunkC: chunkC,
|
|
chunkSize: self.chunkSize,
|
|
branches: self.branches,
|
|
hashSize: self.hashSize,
|
|
}
|
|
}
|
|
|
|
func (self *PyramidChunker) incrementWorkerCount() {
|
|
self.workerLock.Lock()
|
|
defer self.workerLock.Unlock()
|
|
self.workerCount += 1
|
|
}
|
|
|
|
func (self *PyramidChunker) getWorkerCount() int64 {
|
|
self.workerLock.Lock()
|
|
defer self.workerLock.Unlock()
|
|
return self.workerCount
|
|
}
|
|
|
|
func (self *PyramidChunker) decrementWorkerCount() {
|
|
self.workerLock.Lock()
|
|
defer self.workerLock.Unlock()
|
|
self.workerCount -= 1
|
|
}
|
|
|
|
func (self *PyramidChunker) Split(data io.Reader, size int64, chunkC chan *Chunk, storageWG, processorWG *sync.WaitGroup) (Key, error) {
|
|
jobC := make(chan *chunkJob, 2*ChunkProcessors)
|
|
wg := &sync.WaitGroup{}
|
|
errC := make(chan error)
|
|
quitC := make(chan bool)
|
|
rootKey := make([]byte, self.hashSize)
|
|
chunkLevel := make([][]*TreeEntry, self.branches)
|
|
|
|
wg.Add(1)
|
|
go self.prepareChunks(false, chunkLevel, data, rootKey, quitC, wg, jobC, processorWG, chunkC, errC, storageWG)
|
|
|
|
// closes internal error channel if all subprocesses in the workgroup finished
|
|
go func() {
|
|
|
|
// waiting for all chunks to finish
|
|
wg.Wait()
|
|
|
|
// if storage waitgroup is non-nil, we wait for storage to finish too
|
|
if storageWG != nil {
|
|
storageWG.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(errC)
|
|
}()
|
|
|
|
defer close(quitC)
|
|
|
|
select {
|
|
case err := <-errC:
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case <-time.NewTimer(splitTimeout).C:
|
|
}
|
|
return rootKey, nil
|
|
|
|
}
|
|
|
|
func (self *PyramidChunker) Append(key Key, data io.Reader, chunkC chan *Chunk, storageWG, processorWG *sync.WaitGroup) (Key, error) {
|
|
quitC := make(chan bool)
|
|
rootKey := make([]byte, self.hashSize)
|
|
chunkLevel := make([][]*TreeEntry, self.branches)
|
|
|
|
// Load the right most unfinished tree chunks in every level
|
|
self.loadTree(chunkLevel, key, chunkC, quitC)
|
|
|
|
jobC := make(chan *chunkJob, 2*ChunkProcessors)
|
|
wg := &sync.WaitGroup{}
|
|
errC := make(chan error)
|
|
|
|
wg.Add(1)
|
|
go self.prepareChunks(true, chunkLevel, data, rootKey, quitC, wg, jobC, processorWG, chunkC, errC, storageWG)
|
|
|
|
// closes internal error channel if all subprocesses in the workgroup finished
|
|
go func() {
|
|
|
|
// waiting for all chunks to finish
|
|
wg.Wait()
|
|
|
|
// if storage waitgroup is non-nil, we wait for storage to finish too
|
|
if storageWG != nil {
|
|
storageWG.Wait()
|
|
}
|
|
close(errC)
|
|
}()
|
|
|
|
defer close(quitC)
|
|
|
|
select {
|
|
case err := <-errC:
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case <-time.NewTimer(splitTimeout).C:
|
|
}
|
|
return rootKey, nil
|
|
|
|
}
|
|
|
|
func (self *PyramidChunker) processor(id int64, jobC chan *chunkJob, chunkC chan *Chunk, errC chan error, quitC chan bool, swg, wwg *sync.WaitGroup) {
|
|
defer self.decrementWorkerCount()
|
|
|
|
hasher := self.hashFunc()
|
|
if wwg != nil {
|
|
defer wwg.Done()
|
|
}
|
|
for {
|
|
select {
|
|
|
|
case job, ok := <-jobC:
|
|
if !ok {
|
|
return
|
|
}
|
|
self.processChunk(id, hasher, job, chunkC, swg)
|
|
case <-quitC:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (self *PyramidChunker) processChunk(id int64, hasher SwarmHash, job *chunkJob, chunkC chan *Chunk, swg *sync.WaitGroup) {
|
|
hasher.ResetWithLength(job.chunk[:8]) // 8 bytes of length
|
|
hasher.Write(job.chunk[8:]) // minus 8 []byte length
|
|
h := hasher.Sum(nil)
|
|
|
|
newChunk := &Chunk{
|
|
Key: h,
|
|
SData: job.chunk,
|
|
Size: job.size,
|
|
wg: swg,
|
|
}
|
|
|
|
// report hash of this chunk one level up (keys corresponds to the proper subslice of the parent chunk)
|
|
copy(job.key, h)
|
|
|
|
// send off new chunk to storage
|
|
if chunkC != nil {
|
|
if swg != nil {
|
|
swg.Add(1)
|
|
}
|
|
}
|
|
job.parentWg.Done()
|
|
|
|
if chunkC != nil {
|
|
chunkC <- newChunk
|
|
}
|
|
}
|
|
|
|
func (self *PyramidChunker) loadTree(chunkLevel [][]*TreeEntry, key Key, chunkC chan *Chunk, quitC chan bool) error {
|
|
// Get the root chunk to get the total size
|
|
chunk := retrieve(key, chunkC, quitC)
|
|
if chunk == nil {
|
|
return errLoadingTreeRootChunk
|
|
}
|
|
|
|
//if data size is less than a chunk... add a parent with update as pending
|
|
if chunk.Size <= self.chunkSize {
|
|
newEntry := &TreeEntry{
|
|
level: 0,
|
|
branchCount: 1,
|
|
subtreeSize: uint64(chunk.Size),
|
|
chunk: make([]byte, self.chunkSize+8),
|
|
key: make([]byte, self.hashSize),
|
|
index: 0,
|
|
updatePending: true,
|
|
}
|
|
copy(newEntry.chunk[8:], chunk.Key)
|
|
chunkLevel[0] = append(chunkLevel[0], newEntry)
|
|
return nil
|
|
}
|
|
|
|
var treeSize int64
|
|
var depth int
|
|
treeSize = self.chunkSize
|
|
for ; treeSize < chunk.Size; treeSize *= self.branches {
|
|
depth++
|
|
}
|
|
|
|
// Add the root chunk entry
|
|
branchCount := int64(len(chunk.SData)-8) / self.hashSize
|
|
newEntry := &TreeEntry{
|
|
level: depth - 1,
|
|
branchCount: branchCount,
|
|
subtreeSize: uint64(chunk.Size),
|
|
chunk: chunk.SData,
|
|
key: key,
|
|
index: 0,
|
|
updatePending: true,
|
|
}
|
|
chunkLevel[depth-1] = append(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 chunkLevel[lvl] {
|
|
branchCount = int64(len(ent.chunk)-8) / self.hashSize
|
|
for i := int64(0); i < branchCount; i++ {
|
|
key := ent.chunk[8+(i*self.hashSize) : 8+((i+1)*self.hashSize)]
|
|
newChunk := retrieve(key, chunkC, quitC)
|
|
if newChunk == nil {
|
|
return errLoadingTreeChunk
|
|
}
|
|
bewBranchCount := int64(len(newChunk.SData)-8) / self.hashSize
|
|
newEntry := &TreeEntry{
|
|
level: lvl - 1,
|
|
branchCount: bewBranchCount,
|
|
subtreeSize: uint64(newChunk.Size),
|
|
chunk: newChunk.SData,
|
|
key: key,
|
|
index: 0,
|
|
updatePending: true,
|
|
}
|
|
chunkLevel[lvl-1] = append(chunkLevel[lvl-1], newEntry)
|
|
|
|
}
|
|
|
|
// We need to get only the right most unfinished branch.. so trim all finished branches
|
|
if int64(len(chunkLevel[lvl-1])) >= self.branches {
|
|
chunkLevel[lvl-1] = nil
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *PyramidChunker) prepareChunks(isAppend bool, chunkLevel [][]*TreeEntry, data io.Reader, rootKey []byte, quitC chan bool, wg *sync.WaitGroup, jobC chan *chunkJob, processorWG *sync.WaitGroup, chunkC chan *Chunk, errC chan error, storageWG *sync.WaitGroup) {
|
|
defer wg.Done()
|
|
|
|
chunkWG := &sync.WaitGroup{}
|
|
totalDataSize := 0
|
|
|
|
// processorWG keeps track of workers spawned for hashing chunks
|
|
if processorWG != nil {
|
|
processorWG.Add(1)
|
|
}
|
|
|
|
self.incrementWorkerCount()
|
|
go self.processor(self.workerCount, jobC, chunkC, errC, quitC, storageWG, processorWG)
|
|
|
|
parent := NewTreeEntry(self)
|
|
var unFinishedChunk *Chunk
|
|
|
|
if isAppend && len(chunkLevel[0]) != 0 {
|
|
|
|
lastIndex := len(chunkLevel[0]) - 1
|
|
ent := chunkLevel[0][lastIndex]
|
|
|
|
if ent.branchCount < self.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
|
|
lastKey := parent.chunk[8+lastBranch*self.hashSize : 8+(lastBranch+1)*self.hashSize]
|
|
|
|
unFinishedChunk = retrieve(lastKey, chunkC, quitC)
|
|
if unFinishedChunk.Size < self.chunkSize {
|
|
|
|
parent.subtreeSize = parent.subtreeSize - uint64(unFinishedChunk.Size)
|
|
parent.branchCount = parent.branchCount - 1
|
|
} else {
|
|
unFinishedChunk = nil
|
|
}
|
|
}
|
|
}
|
|
|
|
for index := 0; ; index++ {
|
|
|
|
var n int
|
|
var err error
|
|
chunkData := make([]byte, self.chunkSize+8)
|
|
if unFinishedChunk != nil {
|
|
copy(chunkData, unFinishedChunk.SData)
|
|
n, err = data.Read(chunkData[8+unFinishedChunk.Size:])
|
|
n += int(unFinishedChunk.Size)
|
|
unFinishedChunk = nil
|
|
} else {
|
|
n, err = data.Read(chunkData[8:])
|
|
}
|
|
|
|
totalDataSize += n
|
|
if err != nil {
|
|
if err == io.EOF || err == io.ErrUnexpectedEOF {
|
|
if parent.branchCount == 1 {
|
|
// Data is exactly one chunk.. pick the last chunk key as root
|
|
chunkWG.Wait()
|
|
lastChunksKey := parent.chunk[8 : 8+self.hashSize]
|
|
copy(rootKey, lastChunksKey)
|
|
break
|
|
}
|
|
} else {
|
|
close(quitC)
|
|
break
|
|
}
|
|
}
|
|
|
|
// Data ended in chunk boundary.. just signal to start bulding tree
|
|
if n == 0 {
|
|
self.buildTree(isAppend, chunkLevel, parent, chunkWG, jobC, quitC, true, rootKey)
|
|
break
|
|
} else {
|
|
|
|
pkey := self.enqueueDataChunk(chunkData, uint64(n), parent, chunkWG, jobC, quitC)
|
|
|
|
// update tree related parent data structures
|
|
parent.subtreeSize += uint64(n)
|
|
parent.branchCount++
|
|
|
|
// Data got exhausted... signal to send any parent tree related chunks
|
|
if int64(n) < self.chunkSize {
|
|
|
|
// only one data chunk .. so dont add any parent chunk
|
|
if parent.branchCount <= 1 {
|
|
chunkWG.Wait()
|
|
copy(rootKey, pkey)
|
|
break
|
|
}
|
|
|
|
self.buildTree(isAppend, chunkLevel, parent, chunkWG, jobC, quitC, true, rootKey)
|
|
break
|
|
}
|
|
|
|
if parent.branchCount == self.branches {
|
|
self.buildTree(isAppend, chunkLevel, parent, chunkWG, jobC, quitC, false, rootKey)
|
|
parent = NewTreeEntry(self)
|
|
}
|
|
|
|
}
|
|
|
|
workers := self.getWorkerCount()
|
|
if int64(len(jobC)) > workers && workers < ChunkProcessors {
|
|
if processorWG != nil {
|
|
processorWG.Add(1)
|
|
}
|
|
self.incrementWorkerCount()
|
|
go self.processor(self.workerCount, jobC, chunkC, errC, quitC, storageWG, processorWG)
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
func (self *PyramidChunker) buildTree(isAppend bool, chunkLevel [][]*TreeEntry, ent *TreeEntry, chunkWG *sync.WaitGroup, jobC chan *chunkJob, quitC chan bool, last bool, rootKey []byte) {
|
|
chunkWG.Wait()
|
|
self.enqueueTreeChunk(chunkLevel, ent, chunkWG, jobC, quitC, last)
|
|
|
|
compress := false
|
|
endLvl := self.branches
|
|
for lvl := int64(0); lvl < self.branches; lvl++ {
|
|
lvlCount := int64(len(chunkLevel[lvl]))
|
|
if lvlCount >= self.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(chunkLevel[lvl]))
|
|
if lvlCount == 1 && last {
|
|
copy(rootKey, chunkLevel[lvl][0].key)
|
|
return
|
|
}
|
|
|
|
for startCount := int64(0); startCount < lvlCount; startCount += self.branches {
|
|
|
|
endCount := startCount + self.branches
|
|
if endCount > lvlCount {
|
|
endCount = lvlCount
|
|
}
|
|
|
|
var nextLvlCount int64
|
|
var tempEntry *TreeEntry
|
|
if len(chunkLevel[lvl+1]) > 0 {
|
|
nextLvlCount = int64(len(chunkLevel[lvl+1]) - 1)
|
|
tempEntry = chunkLevel[lvl+1][nextLvlCount]
|
|
}
|
|
if isAppend && tempEntry != nil && tempEntry.updatePending {
|
|
updateEntry := &TreeEntry{
|
|
level: int(lvl + 1),
|
|
branchCount: 0,
|
|
subtreeSize: 0,
|
|
chunk: make([]byte, self.chunkSize+8),
|
|
key: make([]byte, self.hashSize),
|
|
index: int(nextLvlCount),
|
|
updatePending: true,
|
|
}
|
|
for index := int64(0); index < lvlCount; index++ {
|
|
updateEntry.branchCount++
|
|
updateEntry.subtreeSize += chunkLevel[lvl][index].subtreeSize
|
|
copy(updateEntry.chunk[8+(index*self.hashSize):8+((index+1)*self.hashSize)], chunkLevel[lvl][index].key[:self.hashSize])
|
|
}
|
|
|
|
self.enqueueTreeChunk(chunkLevel, updateEntry, chunkWG, jobC, quitC, last)
|
|
|
|
} else {
|
|
|
|
noOfBranches := endCount - startCount
|
|
newEntry := &TreeEntry{
|
|
level: int(lvl + 1),
|
|
branchCount: noOfBranches,
|
|
subtreeSize: 0,
|
|
chunk: make([]byte, (noOfBranches*self.hashSize)+8),
|
|
key: make([]byte, self.hashSize),
|
|
index: int(nextLvlCount),
|
|
updatePending: false,
|
|
}
|
|
|
|
index := int64(0)
|
|
for i := startCount; i < endCount; i++ {
|
|
entry := chunkLevel[lvl][i]
|
|
newEntry.subtreeSize += entry.subtreeSize
|
|
copy(newEntry.chunk[8+(index*self.hashSize):8+((index+1)*self.hashSize)], entry.key[:self.hashSize])
|
|
index++
|
|
}
|
|
|
|
self.enqueueTreeChunk(chunkLevel, newEntry, chunkWG, jobC, quitC, last)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if !isAppend {
|
|
chunkWG.Wait()
|
|
if compress {
|
|
chunkLevel[lvl] = nil
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
func (self *PyramidChunker) enqueueTreeChunk(chunkLevel [][]*TreeEntry, ent *TreeEntry, chunkWG *sync.WaitGroup, jobC chan *chunkJob, quitC chan bool, last bool) {
|
|
if ent != nil {
|
|
|
|
// 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, self.hashSize)
|
|
chunkWG.Add(1)
|
|
select {
|
|
case jobC <- &chunkJob{ent.key, ent.chunk[:ent.branchCount*self.hashSize+8], int64(ent.subtreeSize), chunkWG, TreeChunk, 0}:
|
|
case <-quitC:
|
|
}
|
|
|
|
// Update or append based on weather it is a new entry or being reused
|
|
if ent.updatePending {
|
|
chunkWG.Wait()
|
|
chunkLevel[ent.level][ent.index] = ent
|
|
} else {
|
|
chunkLevel[ent.level] = append(chunkLevel[ent.level], ent)
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
func (self *PyramidChunker) enqueueDataChunk(chunkData []byte, size uint64, parent *TreeEntry, chunkWG *sync.WaitGroup, jobC chan *chunkJob, quitC chan bool) Key {
|
|
binary.LittleEndian.PutUint64(chunkData[:8], size)
|
|
pkey := parent.chunk[8+parent.branchCount*self.hashSize : 8+(parent.branchCount+1)*self.hashSize]
|
|
|
|
chunkWG.Add(1)
|
|
select {
|
|
case jobC <- &chunkJob{pkey, chunkData[:size+8], int64(size), chunkWG, DataChunk, -1}:
|
|
case <-quitC:
|
|
}
|
|
|
|
return pkey
|
|
|
|
}
|