mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-04 14:46:57 -05:00
12a1f914f4
* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1 * github.com/blevesearch/bleve v1.0.10 -> v1.0.12 * editorconfig-core-go v2.1.1 -> v2.3.7 * github.com/gliderlabs/ssh v0.2.2 -> v0.3.1 * migrate editorconfig.ParseBytes to Parse * github.com/shurcooL/vfsgen to 0d455de96546 * github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0 * github.com/google/uuid v1.1.1 -> v1.1.2 * github.com/huandu/xstrings v1.3.0 -> v1.3.2 * github.com/klauspost/compress v1.10.11 -> v1.11.1 * github.com/markbates/goth v1.61.2 -> v1.65.0 * github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4 * github.com/mholt/archiver v3.3.0 -> v3.3.2 * github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4 * github.com/minio/minio-go v7.0.4 -> v7.0.5 * github.com/olivere/elastic v7.0.9 -> v7.0.20 * github.com/urfave/cli v1.20.0 -> v1.22.4 * github.com/prometheus/client_golang v1.1.0 -> v1.8.0 * github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1 * mvdan.cc/xurls v2.1.0 -> v2.2.0 Co-authored-by: Lauris BH <lauris@nix.lv>
279 lines
5.6 KiB
Go
Vendored
279 lines
5.6 KiB
Go
Vendored
// Package buffer implements a buffer for serialization, consisting of a chain of []byte-s to
|
|
// reduce copying and to allow reuse of individual chunks.
|
|
package buffer
|
|
|
|
import (
|
|
"io"
|
|
"net"
|
|
"sync"
|
|
)
|
|
|
|
// PoolConfig contains configuration for the allocation and reuse strategy.
|
|
type PoolConfig struct {
|
|
StartSize int // Minimum chunk size that is allocated.
|
|
PooledSize int // Minimum chunk size that is reused, reusing chunks too small will result in overhead.
|
|
MaxSize int // Maximum chunk size that will be allocated.
|
|
}
|
|
|
|
var config = PoolConfig{
|
|
StartSize: 128,
|
|
PooledSize: 512,
|
|
MaxSize: 32768,
|
|
}
|
|
|
|
// Reuse pool: chunk size -> pool.
|
|
var buffers = map[int]*sync.Pool{}
|
|
|
|
func initBuffers() {
|
|
for l := config.PooledSize; l <= config.MaxSize; l *= 2 {
|
|
buffers[l] = new(sync.Pool)
|
|
}
|
|
}
|
|
|
|
func init() {
|
|
initBuffers()
|
|
}
|
|
|
|
// Init sets up a non-default pooling and allocation strategy. Should be run before serialization is done.
|
|
func Init(cfg PoolConfig) {
|
|
config = cfg
|
|
initBuffers()
|
|
}
|
|
|
|
// putBuf puts a chunk to reuse pool if it can be reused.
|
|
func putBuf(buf []byte) {
|
|
size := cap(buf)
|
|
if size < config.PooledSize {
|
|
return
|
|
}
|
|
if c := buffers[size]; c != nil {
|
|
c.Put(buf[:0])
|
|
}
|
|
}
|
|
|
|
// getBuf gets a chunk from reuse pool or creates a new one if reuse failed.
|
|
func getBuf(size int) []byte {
|
|
if size >= config.PooledSize {
|
|
if c := buffers[size]; c != nil {
|
|
v := c.Get()
|
|
if v != nil {
|
|
return v.([]byte)
|
|
}
|
|
}
|
|
}
|
|
return make([]byte, 0, size)
|
|
}
|
|
|
|
// Buffer is a buffer optimized for serialization without extra copying.
|
|
type Buffer struct {
|
|
|
|
// Buf is the current chunk that can be used for serialization.
|
|
Buf []byte
|
|
|
|
toPool []byte
|
|
bufs [][]byte
|
|
}
|
|
|
|
// EnsureSpace makes sure that the current chunk contains at least s free bytes,
|
|
// possibly creating a new chunk.
|
|
func (b *Buffer) EnsureSpace(s int) {
|
|
if cap(b.Buf)-len(b.Buf) < s {
|
|
b.ensureSpaceSlow(s)
|
|
}
|
|
}
|
|
|
|
func (b *Buffer) ensureSpaceSlow(s int) {
|
|
l := len(b.Buf)
|
|
if l > 0 {
|
|
if cap(b.toPool) != cap(b.Buf) {
|
|
// Chunk was reallocated, toPool can be pooled.
|
|
putBuf(b.toPool)
|
|
}
|
|
if cap(b.bufs) == 0 {
|
|
b.bufs = make([][]byte, 0, 8)
|
|
}
|
|
b.bufs = append(b.bufs, b.Buf)
|
|
l = cap(b.toPool) * 2
|
|
} else {
|
|
l = config.StartSize
|
|
}
|
|
|
|
if l > config.MaxSize {
|
|
l = config.MaxSize
|
|
}
|
|
b.Buf = getBuf(l)
|
|
b.toPool = b.Buf
|
|
}
|
|
|
|
// AppendByte appends a single byte to buffer.
|
|
func (b *Buffer) AppendByte(data byte) {
|
|
b.EnsureSpace(1)
|
|
b.Buf = append(b.Buf, data)
|
|
}
|
|
|
|
// AppendBytes appends a byte slice to buffer.
|
|
func (b *Buffer) AppendBytes(data []byte) {
|
|
if len(data) <= cap(b.Buf)-len(b.Buf) {
|
|
b.Buf = append(b.Buf, data...) // fast path
|
|
} else {
|
|
b.appendBytesSlow(data)
|
|
}
|
|
}
|
|
|
|
func (b *Buffer) appendBytesSlow(data []byte) {
|
|
for len(data) > 0 {
|
|
b.EnsureSpace(1)
|
|
|
|
sz := cap(b.Buf) - len(b.Buf)
|
|
if sz > len(data) {
|
|
sz = len(data)
|
|
}
|
|
|
|
b.Buf = append(b.Buf, data[:sz]...)
|
|
data = data[sz:]
|
|
}
|
|
}
|
|
|
|
// AppendString appends a string to buffer.
|
|
func (b *Buffer) AppendString(data string) {
|
|
if len(data) <= cap(b.Buf)-len(b.Buf) {
|
|
b.Buf = append(b.Buf, data...) // fast path
|
|
} else {
|
|
b.appendStringSlow(data)
|
|
}
|
|
}
|
|
|
|
func (b *Buffer) appendStringSlow(data string) {
|
|
for len(data) > 0 {
|
|
b.EnsureSpace(1)
|
|
|
|
sz := cap(b.Buf) - len(b.Buf)
|
|
if sz > len(data) {
|
|
sz = len(data)
|
|
}
|
|
|
|
b.Buf = append(b.Buf, data[:sz]...)
|
|
data = data[sz:]
|
|
}
|
|
}
|
|
|
|
// Size computes the size of a buffer by adding sizes of every chunk.
|
|
func (b *Buffer) Size() int {
|
|
size := len(b.Buf)
|
|
for _, buf := range b.bufs {
|
|
size += len(buf)
|
|
}
|
|
return size
|
|
}
|
|
|
|
// DumpTo outputs the contents of a buffer to a writer and resets the buffer.
|
|
func (b *Buffer) DumpTo(w io.Writer) (written int, err error) {
|
|
bufs := net.Buffers(b.bufs)
|
|
if len(b.Buf) > 0 {
|
|
bufs = append(bufs, b.Buf)
|
|
}
|
|
n, err := bufs.WriteTo(w)
|
|
|
|
for _, buf := range b.bufs {
|
|
putBuf(buf)
|
|
}
|
|
putBuf(b.toPool)
|
|
|
|
b.bufs = nil
|
|
b.Buf = nil
|
|
b.toPool = nil
|
|
|
|
return int(n), err
|
|
}
|
|
|
|
// BuildBytes creates a single byte slice with all the contents of the buffer. Data is
|
|
// copied if it does not fit in a single chunk. You can optionally provide one byte
|
|
// slice as argument that it will try to reuse.
|
|
func (b *Buffer) BuildBytes(reuse ...[]byte) []byte {
|
|
if len(b.bufs) == 0 {
|
|
ret := b.Buf
|
|
b.toPool = nil
|
|
b.Buf = nil
|
|
return ret
|
|
}
|
|
|
|
var ret []byte
|
|
size := b.Size()
|
|
|
|
// If we got a buffer as argument and it is big enough, reuse it.
|
|
if len(reuse) == 1 && cap(reuse[0]) >= size {
|
|
ret = reuse[0][:0]
|
|
} else {
|
|
ret = make([]byte, 0, size)
|
|
}
|
|
for _, buf := range b.bufs {
|
|
ret = append(ret, buf...)
|
|
putBuf(buf)
|
|
}
|
|
|
|
ret = append(ret, b.Buf...)
|
|
putBuf(b.toPool)
|
|
|
|
b.bufs = nil
|
|
b.toPool = nil
|
|
b.Buf = nil
|
|
|
|
return ret
|
|
}
|
|
|
|
type readCloser struct {
|
|
offset int
|
|
bufs [][]byte
|
|
}
|
|
|
|
func (r *readCloser) Read(p []byte) (n int, err error) {
|
|
for _, buf := range r.bufs {
|
|
// Copy as much as we can.
|
|
x := copy(p[n:], buf[r.offset:])
|
|
n += x // Increment how much we filled.
|
|
|
|
// Did we empty the whole buffer?
|
|
if r.offset+x == len(buf) {
|
|
// On to the next buffer.
|
|
r.offset = 0
|
|
r.bufs = r.bufs[1:]
|
|
|
|
// We can release this buffer.
|
|
putBuf(buf)
|
|
} else {
|
|
r.offset += x
|
|
}
|
|
|
|
if n == len(p) {
|
|
break
|
|
}
|
|
}
|
|
// No buffers left or nothing read?
|
|
if len(r.bufs) == 0 {
|
|
err = io.EOF
|
|
}
|
|
return
|
|
}
|
|
|
|
func (r *readCloser) Close() error {
|
|
// Release all remaining buffers.
|
|
for _, buf := range r.bufs {
|
|
putBuf(buf)
|
|
}
|
|
// In case Close gets called multiple times.
|
|
r.bufs = nil
|
|
|
|
return nil
|
|
}
|
|
|
|
// ReadCloser creates an io.ReadCloser with all the contents of the buffer.
|
|
func (b *Buffer) ReadCloser() io.ReadCloser {
|
|
ret := &readCloser{0, append(b.bufs, b.Buf)}
|
|
|
|
b.bufs = nil
|
|
b.toPool = nil
|
|
b.Buf = nil
|
|
|
|
return ret
|
|
}
|