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