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package packp
import (
"bytes"
"errors"
"fmt"
"io"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/format/pktline"
)
const ackLineLen = 44
// ServerResponse object acknowledgement from upload-pack service
// TODO: implement support for multi_ack or multi_ack_detailed responses
type ServerResponse struct {
ACKs []plumbing.Hash
}
// Decode decodes the response into the struct, isMultiACK should be true, if
// the request was done with multi_ack or multi_ack_detailed capabilities
func (r *ServerResponse) Decode(reader io.Reader, isMultiACK bool) error {
if isMultiACK {
return errors.New("multi_ack and multi_ack_detailed are not supported")
}
s := pktline.NewScanner(reader)
for s.Scan() {
line := s.Bytes()
if err := r.decodeLine(line); err != nil {
return err
}
if !isMultiACK {
break
}
}
return s.Err()
}
func (r *ServerResponse) decodeLine(line []byte) error {
if len(line) == 0 {
return fmt.Errorf("unexpected flush")
}
if bytes.Compare(line[0:3], ack) == 0 {
return r.decodeACKLine(line)
}
if bytes.Compare(line[0:3], nak) == 0 {
return nil
}
return fmt.Errorf("unexpected content %q", string(line))
}
func (r *ServerResponse) decodeACKLine(line []byte) error {
if len(line) < ackLineLen {
return fmt.Errorf("malformed ACK %q", line)
}
sp := bytes.Index(line, []byte(" "))
h := plumbing.NewHash(string(line[sp+1 : sp+41]))
r.ACKs = append(r.ACKs, h)
return nil
}
// Encode encodes the ServerResponse into a writer.
func (r *ServerResponse) Encode(w io.Writer) error {
if len(r.ACKs) > 1 {
return errors.New("multi_ack and multi_ack_detailed are not supported")
}
e := pktline.NewEncoder(w)
if len(r.ACKs) == 0 {
return e.Encodef("%s\n", nak)
}
return e.Encodef("%s %s\n", ack, r.ACKs[0].String())
}
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