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rlp: pool encoder allocations

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This commit is contained in:
Felix Lange 2015-06-25 14:48:08 +02:00 committed by Jeffrey Wilcke
parent c3d6228023
commit 3d0c6a8345
1 changed files with 27 additions and 9 deletions
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36
rlp/encode.go
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@ -5,12 +5,9 @@ import (
"io" "io"
"math/big" "math/big"
"reflect" "reflect"
"sync"
) )
// TODO: put encbufs in a sync.Pool.
// Doing that requires zeroing the buffers after use.
// encReader will need to drop it's buffer when done.
var ( var (
// Common encoded values. // Common encoded values.
// These are useful when implementing EncodeRLP. // These are useful when implementing EncodeRLP.
@ -112,7 +109,9 @@ func Encode(w io.Writer, val interface{}) error {
// Avoid copying by writing to the outer encbuf directly. // Avoid copying by writing to the outer encbuf directly.
return outer.encode(val) return outer.encode(val)
} }
eb := newencbuf() eb := encbufPool.Get().(*encbuf)
eb.reset()
defer encbufPool.Put(eb)
if err := eb.encode(val); err != nil { if err := eb.encode(val); err != nil {
return err return err
} }
@ -122,7 +121,9 @@ func Encode(w io.Writer, val interface{}) error {
// EncodeBytes returns the RLP encoding of val. // EncodeBytes returns the RLP encoding of val.
// Please see the documentation of Encode for the encoding rules. // Please see the documentation of Encode for the encoding rules.
func EncodeToBytes(val interface{}) ([]byte, error) { func EncodeToBytes(val interface{}) ([]byte, error) {
eb := newencbuf() eb := encbufPool.Get().(*encbuf)
eb.reset()
defer encbufPool.Put(eb)
if err := eb.encode(val); err != nil { if err := eb.encode(val); err != nil {
return nil, err return nil, err
} }
@ -135,7 +136,8 @@ func EncodeToBytes(val interface{}) ([]byte, error) {
// //
// Please see the documentation of Encode for the encoding rules. // Please see the documentation of Encode for the encoding rules.
func EncodeToReader(val interface{}) (size int, r io.Reader, err error) { func EncodeToReader(val interface{}) (size int, r io.Reader, err error) {
eb := newencbuf() eb := encbufPool.Get().(*encbuf)
eb.reset()
if err := eb.encode(val); err != nil { if err := eb.encode(val); err != nil {
return 0, nil, err return 0, nil, err
} }
@ -182,8 +184,19 @@ func puthead(buf []byte, smalltag, largetag byte, size uint64) int {
} }
} }
func newencbuf() *encbuf { // encbufs are pooled.
return &encbuf{sizebuf: make([]byte, 9)} var encbufPool = sync.Pool{
New: func() interface{} { return &encbuf{sizebuf: make([]byte, 9)} },
}
func (w *encbuf) reset() {
w.lhsize = 0
if w.str != nil {
w.str = w.str[:0]
}
if w.lheads != nil {
w.lheads = w.lheads[:0]
}
} }
// encbuf implements io.Writer so it can be passed it into EncodeRLP. // encbuf implements io.Writer so it can be passed it into EncodeRLP.
@ -295,6 +308,8 @@ type encReader struct {
func (r *encReader) Read(b []byte) (n int, err error) { func (r *encReader) Read(b []byte) (n int, err error) {
for { for {
if r.piece = r.next(); r.piece == nil { if r.piece = r.next(); r.piece == nil {
encbufPool.Put(r.buf)
r.buf = nil
return n, io.EOF return n, io.EOF
} }
nn := copy(b[n:], r.piece) nn := copy(b[n:], r.piece)
@ -313,6 +328,9 @@ func (r *encReader) Read(b []byte) (n int, err error) {
// it returns nil at EOF. // it returns nil at EOF.
func (r *encReader) next() []byte { func (r *encReader) next() []byte {
switch { switch {
case r.buf == nil:
return nil
case r.piece != nil: case r.piece != nil:
// There is still data available for reading. // There is still data available for reading.
return r.piece return r.piece