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package mpb
import (
"io"
"io/ioutil"
"time"
)
type proxyReader struct {
io.ReadCloser
bar *Bar
}
func (x *proxyReader) Read(p []byte) (int, error) {
n, err := x.ReadCloser.Read(p)
x.bar.IncrBy(n)
if err == io.EOF {
go x.bar.SetTotal(0, true)
}
return n, err
}
type proxyWriterTo struct {
io.ReadCloser // *proxyReader
wt io.WriterTo
bar *Bar
}
func (x *proxyWriterTo) WriteTo(w io.Writer) (int64, error) {
n, err := x.wt.WriteTo(w)
x.bar.IncrInt64(n)
if err == io.EOF {
go x.bar.SetTotal(0, true)
}
return n, err
}
type ewmaProxyReader struct {
io.ReadCloser // *proxyReader
bar *Bar
iT time.Time
}
func (x *ewmaProxyReader) Read(p []byte) (int, error) {
n, err := x.ReadCloser.Read(p)
if n > 0 {
x.bar.DecoratorEwmaUpdate(time.Since(x.iT))
x.iT = time.Now()
}
return n, err
}
type ewmaProxyWriterTo struct {
io.ReadCloser // *ewmaProxyReader
wt io.WriterTo // *proxyWriterTo
bar *Bar
iT time.Time
}
func (x *ewmaProxyWriterTo) WriteTo(w io.Writer) (int64, error) {
n, err := x.wt.WriteTo(w)
if n > 0 {
x.bar.DecoratorEwmaUpdate(time.Since(x.iT))
x.iT = time.Now()
}
return n, err
}
func newProxyReader(r io.Reader, bar *Bar) io.ReadCloser {
rc := toReadCloser(r)
rc = &proxyReader{rc, bar}
if wt, isWriterTo := r.(io.WriterTo); bar.hasEwmaDecorators {
now := time.Now()
rc = &ewmaProxyReader{rc, bar, now}
if isWriterTo {
rc = &ewmaProxyWriterTo{rc, wt, bar, now}
}
} else if isWriterTo {
rc = &proxyWriterTo{rc, wt, bar}
}
return rc
}
func toReadCloser(r io.Reader) io.ReadCloser {
if rc, ok := r.(io.ReadCloser); ok {
return rc
}
return ioutil.NopCloser(r)
}
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