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reader.go
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/
reader.go
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package httpseek
import (
"io"
)
type mustReader struct {
rsc io.ReadSeeker
errorHandler func(int, error) error
offset int
}
// NewMustReader returns a reader that will retry reading with partial byte ranges if the underlying reader returns an error.
func NewMustReader(rsc io.ReadSeeker, errorHandler func(int, error) error) io.Reader {
return &mustReader{
rsc: rsc,
errorHandler: errorHandler,
}
}
// NewMustReadCloser returns a reader that will retry reading with partial byte ranges if the underlying reader returns an error.
func NewMustReadCloser(rsc io.ReadSeekCloser, errorHandler func(int, error) error) io.ReadCloser {
return struct {
io.Reader
io.Closer
}{
Reader: NewMustReader(rsc, errorHandler),
Closer: rsc,
}
}
// Read reads from the reader.
func (r *mustReader) Read(p []byte) (n int, err error) {
return r.read(0, p)
}
func (r *mustReader) read(retry int, p []byte) (n int, err error) {
n, err = r.rsc.Read(p)
r.offset += n
if err == nil {
return n, nil
}
if err == io.EOF {
return n, err
}
if r.errorHandler != nil {
if err = r.errorHandler(retry, err); err != nil {
return n, err
}
}
if n != 0 {
return n, nil
}
return r.read(retry+1, p)
}