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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)
return n, err
}
type proxyWriterTo struct {
proxyReader
wt io.WriterTo
}
func (x proxyWriterTo) WriteTo(w io.Writer) (int64, error) {
n, err := x.wt.WriteTo(w)
x.bar.IncrInt64(n)
return n, err
}
type ewmaProxyReader struct {
proxyReader
}
func (x ewmaProxyReader) Read(p []byte) (int, error) {
start := time.Now()
n, err := x.proxyReader.Read(p)
if n > 0 {
x.bar.DecoratorEwmaUpdate(time.Since(start))
}
return n, err
}
type ewmaProxyWriterTo struct {
ewmaProxyReader
wt proxyWriterTo
}
func (x ewmaProxyWriterTo) WriteTo(w io.Writer) (int64, error) {
start := time.Now()
n, err := x.wt.WriteTo(w)
if n > 0 {
x.bar.DecoratorEwmaUpdate(time.Since(start))
}
return n, err
}
func (b *Bar) newProxyReader(r io.Reader) (rc io.ReadCloser) {
pr := proxyReader{toReadCloser(r), b}
if wt, ok := r.(io.WriterTo); ok {
pw := proxyWriterTo{pr, wt}
if b.hasEwma {
rc = ewmaProxyWriterTo{ewmaProxyReader{pr}, pw}
} else {
rc = pw
}
} else if b.hasEwma {
rc = ewmaProxyReader{pr}
} else {
rc = pr
}
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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