700 lines
19 KiB
Go
700 lines
19 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package storage
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import (
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"encoding/binary"
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"errors"
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"io"
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"io/ioutil"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/swarm/log"
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)
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/*
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The main idea of a pyramid chunker is to process the input data without knowing the entire size apriori.
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For this to be achieved, the chunker tree is built from the ground up until the data is exhausted.
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This opens up new aveneus such as easy append and other sort of modifications to the tree thereby avoiding
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duplication of data chunks.
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Below is an example of a two level chunks tree. The leaf chunks are called data chunks and all the above
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chunks are called tree chunks. The tree chunk above data chunks is level 0 and so on until it reaches
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the root tree chunk.
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T10 <- Tree chunk lvl1
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__________________________|_____________________________
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/ | | \
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/ | \ \
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__T00__ ___T01__ ___T02__ ___T03__ <- Tree chunks lvl 0
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/ / \ / / \ / / \ / / \
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/ / \ / / \ / / \ / / \
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D1 D2 ... D128 D1 D2 ... D128 D1 D2 ... D128 D1 D2 ... D128 <- Data Chunks
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The split function continuously read the data and creates data chunks and send them to storage.
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When certain no of data chunks are created (defaultBranches), a signal is sent to create a tree
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entry. When the level 0 tree entries reaches certain threshold (defaultBranches), another signal
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is sent to a tree entry one level up.. and so on... until only the data is exhausted AND only one
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tree entry is present in certain level. The key of tree entry is given out as the rootKey of the file.
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*/
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var (
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errLoadingTreeRootChunk = errors.New("LoadTree Error: Could not load root chunk")
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errLoadingTreeChunk = errors.New("LoadTree Error: Could not load chunk")
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)
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const (
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ChunkProcessors = 8
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splitTimeout = time.Minute * 5
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)
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const (
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DataChunk = 0
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TreeChunk = 1
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)
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type PyramidSplitterParams struct {
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SplitterParams
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getter Getter
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}
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func NewPyramidSplitterParams(addr Address, reader io.Reader, putter Putter, getter Getter, chunkSize int64) *PyramidSplitterParams {
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hashSize := putter.RefSize()
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return &PyramidSplitterParams{
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SplitterParams: SplitterParams{
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ChunkerParams: ChunkerParams{
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chunkSize: chunkSize,
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hashSize: hashSize,
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},
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reader: reader,
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putter: putter,
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addr: addr,
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},
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getter: getter,
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}
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}
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/*
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When splitting, data is given as a SectionReader, and the key is a hashSize long byte slice (Key), the root hash of the entire content will fill this once processing finishes.
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New chunks to store are store using the putter which the caller provides.
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*/
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func PyramidSplit(reader io.Reader, putter Putter, getter Getter) (Address, func(), error) {
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return NewPyramidSplitter(NewPyramidSplitterParams(nil, reader, putter, getter, DefaultChunkSize)).Split()
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}
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func PyramidAppend(addr Address, reader io.Reader, putter Putter, getter Getter) (Address, func(), error) {
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return NewPyramidSplitter(NewPyramidSplitterParams(addr, reader, putter, getter, DefaultChunkSize)).Append()
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}
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// Entry to create a tree node
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type TreeEntry struct {
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level int
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branchCount int64
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subtreeSize uint64
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chunk []byte
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key []byte
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index int // used in append to indicate the index of existing tree entry
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updatePending bool // indicates if the entry is loaded from existing tree
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}
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func NewTreeEntry(pyramid *PyramidChunker) *TreeEntry {
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return &TreeEntry{
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level: 0,
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branchCount: 0,
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subtreeSize: 0,
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chunk: make([]byte, pyramid.chunkSize+8),
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key: make([]byte, pyramid.hashSize),
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index: 0,
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updatePending: false,
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}
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}
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// Used by the hash processor to create a data/tree chunk and send to storage
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type chunkJob struct {
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key Address
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chunk []byte
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parentWg *sync.WaitGroup
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}
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type PyramidChunker struct {
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chunkSize int64
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hashSize int64
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branches int64
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reader io.Reader
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putter Putter
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getter Getter
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key Address
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workerCount int64
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workerLock sync.RWMutex
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jobC chan *chunkJob
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wg *sync.WaitGroup
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errC chan error
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quitC chan bool
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rootKey []byte
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chunkLevel [][]*TreeEntry
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}
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func NewPyramidSplitter(params *PyramidSplitterParams) (pc *PyramidChunker) {
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pc = &PyramidChunker{}
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pc.reader = params.reader
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pc.hashSize = params.hashSize
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pc.branches = params.chunkSize / pc.hashSize
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pc.chunkSize = pc.hashSize * pc.branches
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pc.putter = params.putter
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pc.getter = params.getter
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pc.key = params.addr
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pc.workerCount = 0
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pc.jobC = make(chan *chunkJob, 2*ChunkProcessors)
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pc.wg = &sync.WaitGroup{}
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pc.errC = make(chan error)
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pc.quitC = make(chan bool)
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pc.rootKey = make([]byte, pc.hashSize)
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pc.chunkLevel = make([][]*TreeEntry, pc.branches)
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return
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}
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func (pc *PyramidChunker) Join(addr Address, getter Getter, depth int) LazySectionReader {
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return &LazyChunkReader{
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key: addr,
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depth: depth,
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chunkSize: pc.chunkSize,
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branches: pc.branches,
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hashSize: pc.hashSize,
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getter: getter,
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}
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}
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func (pc *PyramidChunker) incrementWorkerCount() {
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pc.workerLock.Lock()
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defer pc.workerLock.Unlock()
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pc.workerCount += 1
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}
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func (pc *PyramidChunker) getWorkerCount() int64 {
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pc.workerLock.Lock()
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defer pc.workerLock.Unlock()
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return pc.workerCount
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}
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func (pc *PyramidChunker) decrementWorkerCount() {
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pc.workerLock.Lock()
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defer pc.workerLock.Unlock()
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pc.workerCount -= 1
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}
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func (pc *PyramidChunker) Split() (k Address, wait func(), err error) {
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log.Debug("pyramid.chunker: Split()")
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pc.wg.Add(1)
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pc.prepareChunks(false)
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// closes internal error channel if all subprocesses in the workgroup finished
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go func() {
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// waiting for all chunks to finish
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pc.wg.Wait()
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//We close errC here because this is passed down to 8 parallel routines underneath.
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// if a error happens in one of them.. that particular routine raises error...
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// once they all complete successfully, the control comes back and we can safely close this here.
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close(pc.errC)
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}()
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defer close(pc.quitC)
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defer pc.putter.Close()
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select {
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case err := <-pc.errC:
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if err != nil {
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return nil, nil, err
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}
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case <-time.NewTimer(splitTimeout).C:
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}
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return pc.rootKey, pc.putter.Wait, nil
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}
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func (pc *PyramidChunker) Append() (k Address, wait func(), err error) {
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log.Debug("pyramid.chunker: Append()")
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// Load the right most unfinished tree chunks in every level
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pc.loadTree()
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pc.wg.Add(1)
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pc.prepareChunks(true)
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// closes internal error channel if all subprocesses in the workgroup finished
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go func() {
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// waiting for all chunks to finish
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pc.wg.Wait()
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close(pc.errC)
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}()
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defer close(pc.quitC)
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defer pc.putter.Close()
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select {
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case err := <-pc.errC:
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if err != nil {
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return nil, nil, err
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}
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case <-time.NewTimer(splitTimeout).C:
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}
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return pc.rootKey, pc.putter.Wait, nil
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}
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func (pc *PyramidChunker) processor(id int64) {
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defer pc.decrementWorkerCount()
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for {
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select {
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case job, ok := <-pc.jobC:
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if !ok {
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return
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}
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pc.processChunk(id, job)
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case <-pc.quitC:
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return
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}
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}
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}
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func (pc *PyramidChunker) processChunk(id int64, job *chunkJob) {
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log.Debug("pyramid.chunker: processChunk()", "id", id)
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ref, err := pc.putter.Put(job.chunk)
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if err != nil {
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pc.errC <- err
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}
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// report hash of this chunk one level up (keys corresponds to the proper subslice of the parent chunk)
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copy(job.key, ref)
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// send off new chunk to storage
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job.parentWg.Done()
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}
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func (pc *PyramidChunker) loadTree() error {
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log.Debug("pyramid.chunker: loadTree()")
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// Get the root chunk to get the total size
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chunkData, err := pc.getter.Get(Reference(pc.key))
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if err != nil {
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return errLoadingTreeRootChunk
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}
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chunkSize := chunkData.Size()
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log.Trace("pyramid.chunker: root chunk", "chunk.Size", chunkSize, "pc.chunkSize", pc.chunkSize)
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//if data size is less than a chunk... add a parent with update as pending
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if chunkSize <= pc.chunkSize {
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newEntry := &TreeEntry{
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level: 0,
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branchCount: 1,
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subtreeSize: uint64(chunkSize),
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chunk: make([]byte, pc.chunkSize+8),
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key: make([]byte, pc.hashSize),
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index: 0,
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updatePending: true,
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}
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copy(newEntry.chunk[8:], pc.key)
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pc.chunkLevel[0] = append(pc.chunkLevel[0], newEntry)
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return nil
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}
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var treeSize int64
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var depth int
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treeSize = pc.chunkSize
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for ; treeSize < chunkSize; treeSize *= pc.branches {
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depth++
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}
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log.Trace("pyramid.chunker", "depth", depth)
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// Add the root chunk entry
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branchCount := int64(len(chunkData)-8) / pc.hashSize
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newEntry := &TreeEntry{
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level: depth - 1,
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branchCount: branchCount,
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subtreeSize: uint64(chunkSize),
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chunk: chunkData,
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key: pc.key,
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index: 0,
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updatePending: true,
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}
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pc.chunkLevel[depth-1] = append(pc.chunkLevel[depth-1], newEntry)
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// Add the rest of the tree
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for lvl := depth - 1; lvl >= 1; lvl-- {
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//TODO(jmozah): instead of loading finished branches and then trim in the end,
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//avoid loading them in the first place
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for _, ent := range pc.chunkLevel[lvl] {
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branchCount = int64(len(ent.chunk)-8) / pc.hashSize
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for i := int64(0); i < branchCount; i++ {
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key := ent.chunk[8+(i*pc.hashSize) : 8+((i+1)*pc.hashSize)]
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newChunkData, err := pc.getter.Get(Reference(key))
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if err != nil {
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return errLoadingTreeChunk
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}
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newChunkSize := newChunkData.Size()
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bewBranchCount := int64(len(newChunkData)-8) / pc.hashSize
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newEntry := &TreeEntry{
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level: lvl - 1,
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branchCount: bewBranchCount,
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subtreeSize: uint64(newChunkSize),
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chunk: newChunkData,
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key: key,
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index: 0,
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updatePending: true,
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}
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pc.chunkLevel[lvl-1] = append(pc.chunkLevel[lvl-1], newEntry)
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}
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// We need to get only the right most unfinished branch.. so trim all finished branches
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if int64(len(pc.chunkLevel[lvl-1])) >= pc.branches {
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pc.chunkLevel[lvl-1] = nil
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}
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}
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}
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return nil
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}
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func (pc *PyramidChunker) prepareChunks(isAppend bool) {
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log.Debug("pyramid.chunker: prepareChunks", "isAppend", isAppend)
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defer pc.wg.Done()
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chunkWG := &sync.WaitGroup{}
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pc.incrementWorkerCount()
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go pc.processor(pc.workerCount)
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parent := NewTreeEntry(pc)
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var unfinishedChunkData ChunkData
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var unfinishedChunkSize int64
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if isAppend && len(pc.chunkLevel[0]) != 0 {
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lastIndex := len(pc.chunkLevel[0]) - 1
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ent := pc.chunkLevel[0][lastIndex]
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if ent.branchCount < pc.branches {
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parent = &TreeEntry{
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level: 0,
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branchCount: ent.branchCount,
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subtreeSize: ent.subtreeSize,
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chunk: ent.chunk,
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key: ent.key,
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index: lastIndex,
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updatePending: true,
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}
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lastBranch := parent.branchCount - 1
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lastKey := parent.chunk[8+lastBranch*pc.hashSize : 8+(lastBranch+1)*pc.hashSize]
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var err error
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unfinishedChunkData, err = pc.getter.Get(lastKey)
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if err != nil {
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pc.errC <- err
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}
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unfinishedChunkSize = unfinishedChunkData.Size()
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if unfinishedChunkSize < pc.chunkSize {
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parent.subtreeSize = parent.subtreeSize - uint64(unfinishedChunkSize)
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parent.branchCount = parent.branchCount - 1
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} else {
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unfinishedChunkData = nil
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}
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}
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}
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for index := 0; ; index++ {
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var err error
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chunkData := make([]byte, pc.chunkSize+8)
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var readBytes int
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if unfinishedChunkData != nil {
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copy(chunkData, unfinishedChunkData)
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readBytes += int(unfinishedChunkSize)
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unfinishedChunkData = nil
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log.Trace("pyramid.chunker: found unfinished chunk", "readBytes", readBytes)
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}
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var res []byte
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res, err = ioutil.ReadAll(io.LimitReader(pc.reader, int64(len(chunkData)-(8+readBytes))))
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// hack for ioutil.ReadAll:
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// a successful call to ioutil.ReadAll returns err == nil, not err == EOF, whereas we
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// want to propagate the io.EOF error
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if len(res) == 0 && err == nil {
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err = io.EOF
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}
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copy(chunkData[8+readBytes:], res)
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readBytes += len(res)
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log.Trace("pyramid.chunker: copied all data", "readBytes", readBytes)
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if err != nil {
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if err == io.EOF || err == io.ErrUnexpectedEOF {
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pc.cleanChunkLevels()
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// Check if we are appending or the chunk is the only one.
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if parent.branchCount == 1 && (pc.depth() == 0 || isAppend) {
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// Data is exactly one chunk.. pick the last chunk key as root
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chunkWG.Wait()
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lastChunksKey := parent.chunk[8 : 8+pc.hashSize]
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copy(pc.rootKey, lastChunksKey)
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break
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}
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} else {
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close(pc.quitC)
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break
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}
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}
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// Data ended in chunk boundary.. just signal to start bulding tree
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if readBytes == 0 {
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pc.buildTree(isAppend, parent, chunkWG, true, nil)
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break
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} else {
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pkey := pc.enqueueDataChunk(chunkData, uint64(readBytes), parent, chunkWG)
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// update tree related parent data structures
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parent.subtreeSize += uint64(readBytes)
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parent.branchCount++
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// Data got exhausted... signal to send any parent tree related chunks
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if int64(readBytes) < pc.chunkSize {
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pc.cleanChunkLevels()
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// only one data chunk .. so dont add any parent chunk
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if parent.branchCount <= 1 {
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chunkWG.Wait()
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if isAppend || pc.depth() == 0 {
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// No need to build the tree if the depth is 0
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// or we are appending.
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// Just use the last key.
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copy(pc.rootKey, pkey)
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} else {
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// We need to build the tree and and provide the lonely
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// chunk key to replace the last tree chunk key.
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pc.buildTree(isAppend, parent, chunkWG, true, pkey)
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}
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break
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}
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pc.buildTree(isAppend, parent, chunkWG, true, nil)
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break
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}
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if parent.branchCount == pc.branches {
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pc.buildTree(isAppend, parent, chunkWG, false, nil)
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parent = NewTreeEntry(pc)
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}
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}
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workers := pc.getWorkerCount()
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if int64(len(pc.jobC)) > workers && workers < ChunkProcessors {
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pc.incrementWorkerCount()
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go pc.processor(pc.workerCount)
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}
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}
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}
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func (pc *PyramidChunker) buildTree(isAppend bool, ent *TreeEntry, chunkWG *sync.WaitGroup, last bool, lonelyChunkKey []byte) {
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chunkWG.Wait()
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pc.enqueueTreeChunk(ent, chunkWG, last)
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compress := false
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endLvl := pc.branches
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for lvl := int64(0); lvl < pc.branches; lvl++ {
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lvlCount := int64(len(pc.chunkLevel[lvl]))
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if lvlCount >= pc.branches {
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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.rootKey, 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)...)
|
|
}
|
|
}
|
|
}
|