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package packp
import (
"fmt"
"io"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/format/pktline"
)
// UploadHaves is a message to signal the references that a client has in a
// upload-pack. Do not use this directly. Use UploadPackRequest request instead.
type UploadHaves struct {
Haves []plumbing.Hash
}
// Encode encodes the UploadHaves into the Writer.
func (u *UploadHaves) Encode(w io.Writer) error {
e := pktline.NewEncoder(w)
for _, have := range u.Haves {
if err := e.Encodef("have %s\n", have); err != nil {
return fmt.Errorf("sending haves for %q: %s", have, err)
}
}
if len(u.Haves) != 0 {
if err := e.Flush(); err != nil {
return fmt.Errorf("sending flush-pkt after haves: %s", err)
}
}
return nil
}
// Have adds a hash reference to the 'haves' list.
func (r *UploadHaves) Have(h ...plumbing.Hash) {
r.Haves = append(r.Haves, h...)
}
// UploadPackRequest represents a upload-pack request.
// Zero-value is not safe, use NewUploadPackRequest instead.
type UploadPackRequest struct {
*UploadRequest
*UploadHaves
}
// NewUploadPackRequest creates a new UploadPackRequest and returns a pointer.
func NewUploadPackRequest() *UploadPackRequest {
return &UploadPackRequest{
UploadHaves: &UploadHaves{},
UploadRequest: NewUploadRequest(),
}
}
func (r *UploadPackRequest) IsEmpty() bool {
return isSubset(r.Wants, r.Haves)
}
func isSubset(needle []plumbing.Hash, haystack []plumbing.Hash) bool {
for _, h := range needle {
found := false
for _, oh := range haystack {
if h == oh {
found = true
break
}
}
if !found {
return false
}
}
return true
}
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