bmt: golint updates for this or self warning (#16628)
* bmt/*: golint updates for this or self warning * Update bmt.go
This commit is contained in:
kiel barry
Péter Szilágyi
parent
fcc18f4c80
commit
784aa83942
178
bmt/bmt.go
178
bmt/bmt.go
@ -150,29 +150,29 @@ func NewTreePool(hasher BaseHasher, segmentCount, capacity int) *TreePool {
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}
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// Drain drains the pool until it has no more than n resources
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func (self *TreePool) Drain(n int) {
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self.lock.Lock()
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defer self.lock.Unlock()
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for len(self.c) > n {
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<-self.c
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self.count--
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func (p *TreePool) Drain(n int) {
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p.lock.Lock()
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defer p.lock.Unlock()
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for len(p.c) > n {
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<-p.c
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p.count--
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}
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}
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// Reserve is blocking until it returns an available Tree
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// it reuses free Trees or creates a new one if size is not reached
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func (self *TreePool) Reserve() *Tree {
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self.lock.Lock()
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defer self.lock.Unlock()
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func (p *TreePool) Reserve() *Tree {
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p.lock.Lock()
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defer p.lock.Unlock()
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var t *Tree
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if self.count == self.Capacity {
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return <-self.c
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if p.count == p.Capacity {
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return <-p.c
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}
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select {
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case t = <-self.c:
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case t = <-p.c:
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default:
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t = NewTree(self.hasher, self.SegmentSize, self.SegmentCount)
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self.count++
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t = NewTree(p.hasher, p.SegmentSize, p.SegmentCount)
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p.count++
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}
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return t
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}
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@ -180,8 +180,8 @@ func (self *TreePool) Reserve() *Tree {
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// Release gives back a Tree to the pool.
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// This Tree is guaranteed to be in reusable state
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// does not need locking
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func (self *TreePool) Release(t *Tree) {
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self.c <- t // can never fail but...
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func (p *TreePool) Release(t *Tree) {
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p.c <- t // can never fail but...
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}
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// Tree is a reusable control structure representing a BMT
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@ -193,17 +193,17 @@ type Tree struct {
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}
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// Draw draws the BMT (badly)
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func (self *Tree) Draw(hash []byte, d int) string {
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func (t *Tree) Draw(hash []byte, d int) string {
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var left, right []string
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var anc []*Node
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for i, n := range self.leaves {
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for i, n := range t.leaves {
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left = append(left, fmt.Sprintf("%v", hashstr(n.left)))
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if i%2 == 0 {
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anc = append(anc, n.parent)
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}
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right = append(right, fmt.Sprintf("%v", hashstr(n.right)))
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}
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anc = self.leaves
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anc = t.leaves
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var hashes [][]string
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for l := 0; len(anc) > 0; l++ {
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var nodes []*Node
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@ -277,42 +277,42 @@ func NewTree(hasher BaseHasher, segmentSize, segmentCount int) *Tree {
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// methods needed by hash.Hash
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// Size returns the size
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func (self *Hasher) Size() int {
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return self.size
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func (h *Hasher) Size() int {
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return h.size
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}
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// BlockSize returns the block size
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func (self *Hasher) BlockSize() int {
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return self.blocksize
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func (h *Hasher) BlockSize() int {
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return h.blocksize
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}
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// Sum returns the hash of the buffer
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// hash.Hash interface Sum method appends the byte slice to the underlying
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// data before it calculates and returns the hash of the chunk
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func (self *Hasher) Sum(b []byte) (r []byte) {
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t := self.bmt
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i := self.cur
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func (h *Hasher) Sum(b []byte) (r []byte) {
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t := h.bmt
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i := h.cur
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n := t.leaves[i]
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j := i
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// must run strictly before all nodes calculate
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// datanodes are guaranteed to have a parent
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if len(self.segment) > self.size && i > 0 && n.parent != nil {
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if len(h.segment) > h.size && i > 0 && n.parent != nil {
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n = n.parent
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} else {
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i *= 2
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}
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d := self.finalise(n, i)
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self.writeSegment(j, self.segment, d)
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c := <-self.result
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self.releaseTree()
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d := h.finalise(n, i)
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h.writeSegment(j, h.segment, d)
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c := <-h.result
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h.releaseTree()
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// sha3(length + BMT(pure_chunk))
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if self.blockLength == nil {
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if h.blockLength == nil {
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return c
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}
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res := self.pool.hasher()
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res := h.pool.hasher()
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res.Reset()
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res.Write(self.blockLength)
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res.Write(h.blockLength)
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res.Write(c)
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return res.Sum(nil)
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}
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@ -321,8 +321,8 @@ func (self *Hasher) Sum(b []byte) (r []byte) {
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// Hash waits for the hasher result and returns it
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// caller must call this on a BMT Hasher being written to
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func (self *Hasher) Hash() []byte {
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return <-self.result
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func (h *Hasher) Hash() []byte {
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return <-h.result
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}
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// Hasher implements the io.Writer interface
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@ -330,16 +330,16 @@ func (self *Hasher) Hash() []byte {
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// Write fills the buffer to hash
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// with every full segment complete launches a hasher go routine
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// that shoots up the BMT
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func (self *Hasher) Write(b []byte) (int, error) {
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func (h *Hasher) Write(b []byte) (int, error) {
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l := len(b)
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if l <= 0 {
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return 0, nil
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}
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s := self.segment
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i := self.cur
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count := (self.count + 1) / 2
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need := self.count*self.size - self.cur*2*self.size
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size := self.size
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s := h.segment
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i := h.cur
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count := (h.count + 1) / 2
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need := h.count*h.size - h.cur*2*h.size
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size := h.size
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if need > size {
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size *= 2
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}
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@ -356,7 +356,7 @@ func (self *Hasher) Write(b []byte) (int, error) {
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// read full segments and the last possibly partial segment
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for need > 0 && i < count-1 {
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// push all finished chunks we read
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self.writeSegment(i, s, self.depth)
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h.writeSegment(i, s, h.depth)
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need -= size
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if need < 0 {
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size += need
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@ -365,8 +365,8 @@ func (self *Hasher) Write(b []byte) (int, error) {
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rest += size
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i++
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}
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self.segment = s
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self.cur = i
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h.segment = s
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h.cur = i
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// otherwise, we can assume len(s) == 0, so all buffer is read and chunk is not yet full
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return l, nil
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}
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@ -376,8 +376,8 @@ func (self *Hasher) Write(b []byte) (int, error) {
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// ReadFrom reads from io.Reader and appends to the data to hash using Write
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// it reads so that chunk to hash is maximum length or reader reaches EOF
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// caller must Reset the hasher prior to call
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func (self *Hasher) ReadFrom(r io.Reader) (m int64, err error) {
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bufsize := self.size*self.count - self.size*self.cur - len(self.segment)
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func (h *Hasher) ReadFrom(r io.Reader) (m int64, err error) {
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bufsize := h.size*h.count - h.size*h.cur - len(h.segment)
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buf := make([]byte, bufsize)
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var read int
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for {
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@ -385,7 +385,7 @@ func (self *Hasher) ReadFrom(r io.Reader) (m int64, err error) {
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n, err = r.Read(buf)
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read += n
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if err == io.EOF || read == len(buf) {
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hash := self.Sum(buf[:n])
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hash := h.Sum(buf[:n])
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if read == len(buf) {
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err = NewEOC(hash)
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}
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@ -394,7 +394,7 @@ func (self *Hasher) ReadFrom(r io.Reader) (m int64, err error) {
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if err != nil {
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break
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}
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n, err = self.Write(buf[:n])
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n, err = h.Write(buf[:n])
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if err != nil {
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break
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}
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@ -403,9 +403,9 @@ func (self *Hasher) ReadFrom(r io.Reader) (m int64, err error) {
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}
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// Reset needs to be called before writing to the hasher
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func (self *Hasher) Reset() {
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self.getTree()
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self.blockLength = nil
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func (h *Hasher) Reset() {
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h.getTree()
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h.blockLength = nil
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}
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// Hasher implements the SwarmHash interface
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@ -413,52 +413,52 @@ func (self *Hasher) Reset() {
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// ResetWithLength needs to be called before writing to the hasher
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// the argument is supposed to be the byte slice binary representation of
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// the length of the data subsumed under the hash
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func (self *Hasher) ResetWithLength(l []byte) {
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self.Reset()
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self.blockLength = l
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func (h *Hasher) ResetWithLength(l []byte) {
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h.Reset()
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h.blockLength = l
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}
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// Release gives back the Tree to the pool whereby it unlocks
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// it resets tree, segment and index
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func (self *Hasher) releaseTree() {
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if self.bmt != nil {
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n := self.bmt.leaves[self.cur]
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func (h *Hasher) releaseTree() {
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if h.bmt != nil {
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n := h.bmt.leaves[h.cur]
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for ; n != nil; n = n.parent {
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n.unbalanced = false
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if n.parent != nil {
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n.root = false
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}
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}
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self.pool.Release(self.bmt)
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self.bmt = nil
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h.pool.Release(h.bmt)
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h.bmt = nil
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}
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self.cur = 0
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self.segment = nil
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h.cur = 0
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h.segment = nil
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}
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func (self *Hasher) writeSegment(i int, s []byte, d int) {
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h := self.pool.hasher()
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n := self.bmt.leaves[i]
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func (h *Hasher) writeSegment(i int, s []byte, d int) {
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hash := h.pool.hasher()
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n := h.bmt.leaves[i]
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if len(s) > self.size && n.parent != nil {
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if len(s) > h.size && n.parent != nil {
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go func() {
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h.Reset()
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h.Write(s)
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s = h.Sum(nil)
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hash.Reset()
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hash.Write(s)
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s = hash.Sum(nil)
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if n.root {
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self.result <- s
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h.result <- s
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return
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}
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self.run(n.parent, h, d, n.index, s)
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h.run(n.parent, hash, d, n.index, s)
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}()
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return
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}
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go self.run(n, h, d, i*2, s)
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go h.run(n, hash, d, i*2, s)
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}
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func (self *Hasher) run(n *Node, h hash.Hash, d int, i int, s []byte) {
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func (h *Hasher) run(n *Node, hash hash.Hash, d int, i int, s []byte) {
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isLeft := i%2 == 0
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for {
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if isLeft {
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@ -470,18 +470,18 @@ func (self *Hasher) run(n *Node, h hash.Hash, d int, i int, s []byte) {
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return
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}
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if !n.unbalanced || !isLeft || i == 0 && d == 0 {
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h.Reset()
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h.Write(n.left)
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h.Write(n.right)
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s = h.Sum(nil)
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hash.Reset()
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hash.Write(n.left)
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hash.Write(n.right)
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s = hash.Sum(nil)
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} else {
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s = append(n.left, n.right...)
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}
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self.hash = s
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h.hash = s
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if n.root {
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self.result <- s
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h.result <- s
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return
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}
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@ -492,20 +492,20 @@ func (self *Hasher) run(n *Node, h hash.Hash, d int, i int, s []byte) {
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}
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// getTree obtains a BMT resource by reserving one from the pool
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func (self *Hasher) getTree() *Tree {
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if self.bmt != nil {
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return self.bmt
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func (h *Hasher) getTree() *Tree {
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if h.bmt != nil {
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return h.bmt
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}
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t := self.pool.Reserve()
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self.bmt = t
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t := h.pool.Reserve()
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h.bmt = t
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return t
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}
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// atomic bool toggle implementing a concurrent reusable 2-state object
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// atomic addint with %2 implements atomic bool toggle
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// it returns true if the toggler just put it in the active/waiting state
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func (self *Node) toggle() bool {
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return atomic.AddInt32(&self.state, 1)%2 == 1
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func (n *Node) toggle() bool {
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return atomic.AddInt32(&n.state, 1)%2 == 1
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}
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func hashstr(b []byte) string {
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@ -525,7 +525,7 @@ func depth(n int) (d int) {
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// finalise is following the zigzags on the tree belonging
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// to the final datasegment
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func (self *Hasher) finalise(n *Node, i int) (d int) {
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func (h *Hasher) finalise(n *Node, i int) (d int) {
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isLeft := i%2 == 0
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for {
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// when the final segment's path is going via left segments
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@ -550,8 +550,8 @@ type EOC struct {
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}
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// Error returns the error string
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func (self *EOC) Error() string {
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return fmt.Sprintf("hasher limit reached, chunk hash: %x", self.Hash)
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func (e *EOC) Error() string {
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return fmt.Sprintf("hasher limit reached, chunk hash: %x", e.Hash)
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}
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// NewEOC creates new end of chunk error with the hash
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