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package fasthttp
import (
"bytes"
"fmt"
"io"
"sync"
"github.com/andybalholm/brotli"
"github.com/valyala/bytebufferpool"
"github.com/valyala/fasthttp/stackless"
)
// Supported compression levels.
const (
CompressBrotliNoCompression = 0
CompressBrotliBestSpeed = brotli.BestSpeed
CompressBrotliBestCompression = brotli.BestCompression
// Choose a default brotli compression level comparable to
// CompressDefaultCompression (gzip 6)
// See: https://github.com/valyala/fasthttp/issues/798#issuecomment-626293806
CompressBrotliDefaultCompression = 4
)
func acquireBrotliReader(r io.Reader) (*brotli.Reader, error) {
v := brotliReaderPool.Get()
if v == nil {
return brotli.NewReader(r), nil
}
zr := v.(*brotli.Reader)
if err := zr.Reset(r); err != nil {
return nil, err
}
return zr, nil
}
func releaseBrotliReader(zr *brotli.Reader) {
brotliReaderPool.Put(zr)
}
var brotliReaderPool sync.Pool
func acquireStacklessBrotliWriter(w io.Writer, level int) stackless.Writer {
nLevel := normalizeBrotliCompressLevel(level)
p := stacklessBrotliWriterPoolMap[nLevel]
v := p.Get()
if v == nil {
return stackless.NewWriter(w, func(w io.Writer) stackless.Writer {
return acquireRealBrotliWriter(w, level)
})
}
sw := v.(stackless.Writer)
sw.Reset(w)
return sw
}
func releaseStacklessBrotliWriter(sw stackless.Writer, level int) {
sw.Close()
nLevel := normalizeBrotliCompressLevel(level)
p := stacklessBrotliWriterPoolMap[nLevel]
p.Put(sw)
}
func acquireRealBrotliWriter(w io.Writer, level int) *brotli.Writer {
nLevel := normalizeBrotliCompressLevel(level)
p := realBrotliWriterPoolMap[nLevel]
v := p.Get()
if v == nil {
zw := brotli.NewWriterLevel(w, level)
return zw
}
zw := v.(*brotli.Writer)
zw.Reset(w)
return zw
}
func releaseRealBrotliWriter(zw *brotli.Writer, level int) {
zw.Close()
nLevel := normalizeBrotliCompressLevel(level)
p := realBrotliWriterPoolMap[nLevel]
p.Put(zw)
}
var (
stacklessBrotliWriterPoolMap = newCompressWriterPoolMap()
realBrotliWriterPoolMap = newCompressWriterPoolMap()
)
// AppendBrotliBytesLevel appends brotlied src to dst using the given
// compression level and returns the resulting dst.
//
// Supported compression levels are:
//
// - CompressBrotliNoCompression
// - CompressBrotliBestSpeed
// - CompressBrotliBestCompression
// - CompressBrotliDefaultCompression
func AppendBrotliBytesLevel(dst, src []byte, level int) []byte {
w := &byteSliceWriter{dst}
WriteBrotliLevel(w, src, level) //nolint:errcheck
return w.b
}
// WriteBrotliLevel writes brotlied p to w using the given compression level
// and returns the number of compressed bytes written to w.
//
// Supported compression levels are:
//
// - CompressBrotliNoCompression
// - CompressBrotliBestSpeed
// - CompressBrotliBestCompression
// - CompressBrotliDefaultCompression
func WriteBrotliLevel(w io.Writer, p []byte, level int) (int, error) {
switch w.(type) {
case *byteSliceWriter,
*bytes.Buffer,
*bytebufferpool.ByteBuffer:
// These writers don't block, so we can just use stacklessWriteBrotli
ctx := &compressCtx{
w: w,
p: p,
level: level,
}
stacklessWriteBrotli(ctx)
return len(p), nil
default:
zw := acquireStacklessBrotliWriter(w, level)
n, err := zw.Write(p)
releaseStacklessBrotliWriter(zw, level)
return n, err
}
}
var (
stacklessWriteBrotliOnce sync.Once
stacklessWriteBrotliFunc func(ctx any) bool
)
func stacklessWriteBrotli(ctx any) {
stacklessWriteBrotliOnce.Do(func() {
stacklessWriteBrotliFunc = stackless.NewFunc(nonblockingWriteBrotli)
})
stacklessWriteBrotliFunc(ctx)
}
func nonblockingWriteBrotli(ctxv any) {
ctx := ctxv.(*compressCtx)
zw := acquireRealBrotliWriter(ctx.w, ctx.level)
zw.Write(ctx.p) //nolint:errcheck // no way to handle this error anyway
releaseRealBrotliWriter(zw, ctx.level)
}
// WriteBrotli writes brotlied p to w and returns the number of compressed
// bytes written to w.
func WriteBrotli(w io.Writer, p []byte) (int, error) {
return WriteBrotliLevel(w, p, CompressBrotliDefaultCompression)
}
// AppendBrotliBytes appends brotlied src to dst and returns the resulting dst.
func AppendBrotliBytes(dst, src []byte) []byte {
return AppendBrotliBytesLevel(dst, src, CompressBrotliDefaultCompression)
}
// WriteUnbrotli writes unbrotlied p to w and returns the number of uncompressed
// bytes written to w.
func WriteUnbrotli(w io.Writer, p []byte) (int, error) {
r := &byteSliceReader{p}
zr, err := acquireBrotliReader(r)
if err != nil {
return 0, err
}
n, err := copyZeroAlloc(w, zr)
releaseBrotliReader(zr)
nn := int(n)
if int64(nn) != n {
return 0, fmt.Errorf("too much data unbrotlied: %d", n)
}
return nn, err
}
// AppendUnbrotliBytes appends unbrotlied src to dst and returns the resulting dst.
func AppendUnbrotliBytes(dst, src []byte) ([]byte, error) {
w := &byteSliceWriter{dst}
_, err := WriteUnbrotli(w, src)
return w.b, err
}
// normalizes compression level into [0..11], so it could be used as an index
// in *PoolMap.
func normalizeBrotliCompressLevel(level int) int {
// -2 is the lowest compression level - CompressHuffmanOnly
// 9 is the highest compression level - CompressBestCompression
if level < 0 || level > 11 {
level = CompressBrotliDefaultCompression
}
return level
}
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