94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
package rifs
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import (
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"io"
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"time"
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"github.com/dsoprea/go-logging"
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)
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// ProgressFunc receives progress updates.
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type ProgressFunc func(n int, duration time.Duration, isEof bool) error
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// WriteProgressWrapper wraps a reader and calls a callback after each read with
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// count and duration info.
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type WriteProgressWrapper struct {
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w io.Writer
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progressCb ProgressFunc
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}
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// NewWriteProgressWrapper returns a new WPW instance.
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func NewWriteProgressWrapper(w io.Writer, progressCb ProgressFunc) io.Writer {
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return &WriteProgressWrapper{
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w: w,
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progressCb: progressCb,
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}
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}
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// Write does a write and calls the callback.
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func (wpw *WriteProgressWrapper) Write(buffer []byte) (n int, err error) {
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defer func() {
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if state := recover(); state != nil {
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err = log.Wrap(state.(error))
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}
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}()
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startAt := time.Now()
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n, err = wpw.w.Write(buffer)
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log.PanicIf(err)
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duration := time.Since(startAt)
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err = wpw.progressCb(n, duration, false)
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log.PanicIf(err)
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return n, nil
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}
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// ReadProgressWrapper wraps a reader and calls a callback after each read with
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// count and duration info.
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type ReadProgressWrapper struct {
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r io.Reader
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progressCb ProgressFunc
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}
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// NewReadProgressWrapper returns a new RPW instance.
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func NewReadProgressWrapper(r io.Reader, progressCb ProgressFunc) io.Reader {
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return &ReadProgressWrapper{
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r: r,
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progressCb: progressCb,
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}
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}
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// Read reads data and calls the callback.
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func (rpw *ReadProgressWrapper) Read(buffer []byte) (n int, err error) {
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defer func() {
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if state := recover(); state != nil {
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err = log.Wrap(state.(error))
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}
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}()
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startAt := time.Now()
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n, err = rpw.r.Read(buffer)
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duration := time.Since(startAt)
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if err != nil {
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if err == io.EOF {
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errInner := rpw.progressCb(n, duration, true)
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log.PanicIf(errInner)
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return n, err
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}
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log.Panic(err)
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}
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err = rpw.progressCb(n, duration, false)
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log.PanicIf(err)
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return n, nil
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}
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