97 lines
1.8 KiB
Go
97 lines
1.8 KiB
Go
package mpb
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import (
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"io"
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"time"
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)
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type proxyReader struct {
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io.ReadCloser
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bar *Bar
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}
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func (x proxyReader) Read(p []byte) (int, error) {
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n, err := x.ReadCloser.Read(p)
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x.bar.IncrBy(n)
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return n, err
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}
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type proxyWriterTo struct {
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proxyReader
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}
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func (x proxyWriterTo) WriteTo(w io.Writer) (int64, error) {
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n, err := x.ReadCloser.(io.WriterTo).WriteTo(w)
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x.bar.IncrInt64(n)
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return n, err
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}
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type ewmaProxyReader struct {
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io.ReadCloser
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bar *Bar
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}
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func (x ewmaProxyReader) Read(p []byte) (int, error) {
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start := time.Now()
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n, err := x.ReadCloser.Read(p)
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x.bar.EwmaIncrBy(n, time.Since(start))
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return n, err
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}
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type ewmaProxyWriterTo struct {
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ewmaProxyReader
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}
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func (x ewmaProxyWriterTo) WriteTo(w io.Writer) (int64, error) {
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start := time.Now()
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n, err := x.ReadCloser.(io.WriterTo).WriteTo(w)
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x.bar.EwmaIncrInt64(n, time.Since(start))
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return n, err
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}
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func newProxyReader(r io.Reader, b *Bar, hasEwma bool) io.ReadCloser {
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rc := toReadCloser(r)
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if hasEwma {
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epr := ewmaProxyReader{rc, b}
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if _, ok := r.(io.WriterTo); ok {
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return ewmaProxyWriterTo{epr}
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}
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return epr
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}
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pr := proxyReader{rc, b}
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if _, ok := r.(io.WriterTo); ok {
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return proxyWriterTo{pr}
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}
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return pr
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}
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func toReadCloser(r io.Reader) io.ReadCloser {
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if rc, ok := r.(io.ReadCloser); ok {
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return rc
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}
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return toNopReadCloser(r)
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}
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func toNopReadCloser(r io.Reader) io.ReadCloser {
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if _, ok := r.(io.WriterTo); ok {
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return nopReadCloserWriterTo{r}
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}
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return nopReadCloser{r}
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}
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type nopReadCloser struct {
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io.Reader
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}
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func (nopReadCloser) Close() error { return nil }
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type nopReadCloserWriterTo struct {
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io.Reader
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}
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func (nopReadCloserWriterTo) Close() error { return nil }
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func (c nopReadCloserWriterTo) WriteTo(w io.Writer) (int64, error) {
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return c.Reader.(io.WriterTo).WriteTo(w)
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}
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