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small memory usage optimization

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This commit is contained in:
yusing 2025-02-25 05:39:21 +08:00
parent 2fe8531e51
commit dc88a037eb
1 changed files with 42 additions and 38 deletions
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22
internal/utils/io.go
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@ -132,6 +132,17 @@ const (
// This is a copy of io.Copy with context and HTTP flusher handling
// Author: yusing <yusing@6uo.me>.
func CopyClose(dst *ContextWriter, src *ContextReader) (err error) {
// If the reader has a WriteTo method, use it to do the copy.
// Avoids an allocation and a copy.
if wt, ok := src.Reader.(io.WriterTo); ok {
_, err = wt.WriteTo(dst)
return
}
// Similarly, if the writer has a ReadFrom method, use it to do the copy.
if rf, ok := dst.Writer.(io.ReaderFrom); ok {
_, err = rf.ReadFrom(src)
return
}
var buf []byte
if l, ok := src.Reader.(*io.LimitedReader); ok {
size := copyBufSize
@ -142,7 +153,7 @@ func CopyClose(dst *ContextWriter, src *ContextReader) (err error) {
size = int(l.N)
}
}
buf = make([]byte, size)
buf = make([]byte, 0, size)
} else {
buf = copyBufPool.Get().([]byte)
defer copyBufPool.Put(buf)
@ -179,13 +190,7 @@ func CopyClose(dst *ContextWriter, src *ContextReader) (err error) {
flusher := getHttpFlusher(dst.Writer)
canFlush := flusher != nil
for {
select {
case <-src.ctx.Done():
return src.ctx.Err()
case <-dst.ctx.Done():
return dst.ctx.Err()
default:
nr, er := src.Reader.Read(buf)
nr, er := src.Reader.Read(buf[:copyBufSize])
if nr > 0 {
nw, ew := dst.Writer.Write(buf[0:nr])
if nw < 0 || nr < nw {
@ -222,7 +227,6 @@ func CopyClose(dst *ContextWriter, src *ContextReader) (err error) {
}
}
}
}
func CopyCloseWithContext(ctx context.Context, dst io.Writer, src io.Reader) (err error) {
return CopyClose(NewContextWriter(ctx, dst), NewContextReader(ctx, src))