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package sideband
import (
"io"
"gopkg.in/src-d/go-git.v4/plumbing/format/pktline"
)
// Muxer multiplex the packfile along with the progress messages and the error
// information. The multiplex is perform using pktline format.
type Muxer struct {
max int
e *pktline.Encoder
}
const chLen = 1
// NewMuxer returns a new Muxer for the given t that writes on w.
//
// If t is equal to `Sideband` the max pack size is set to MaxPackedSize, in any
// other value is given, max pack is set to MaxPackedSize64k, that is the
// maximum lenght of a line in pktline format.
func NewMuxer(t Type, w io.Writer) *Muxer {
max := MaxPackedSize64k
if t == Sideband {
max = MaxPackedSize
}
return &Muxer{
max: max - chLen,
e: pktline.NewEncoder(w),
}
}
// Write writes p in the PackData channel
func (m *Muxer) Write(p []byte) (int, error) {
return m.WriteChannel(PackData, p)
}
// WriteChannel writes p in the given channel. This method can be used with any
// channel, but is recommend use it only for the ProgressMessage and
// ErrorMessage channels and use Write for the PackData channel
func (m *Muxer) WriteChannel(t Channel, p []byte) (int, error) {
wrote := 0
size := len(p)
for wrote < size {
n, err := m.doWrite(t, p[wrote:])
wrote += n
if err != nil {
return wrote, err
}
}
return wrote, nil
}
func (m *Muxer) doWrite(ch Channel, p []byte) (int, error) {
sz := len(p)
if sz > m.max {
sz = m.max
}
return sz, m.e.Encode(ch.WithPayload(p[:sz]))
}
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