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package packp
import (
"bytes"
"fmt"
"io"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/format/pktline"
"github.com/go-git/go-git/v5/plumbing/protocol/packp/capability"
)
// 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 {
ur := NewUploadRequest()
return &UploadPackRequest{
UploadHaves: UploadHaves{},
UploadRequest: *ur,
}
}
// NewUploadPackRequestFromCapabilities creates a new UploadPackRequest and
// returns a pointer. The request capabilities are filled with the most optimal
// ones, based on the adv value (advertised capabilities), the UploadPackRequest
// it has no wants, haves or shallows and an infinite depth
func NewUploadPackRequestFromCapabilities(adv *capability.List) *UploadPackRequest {
ur := NewUploadRequestFromCapabilities(adv)
return &UploadPackRequest{
UploadHaves: UploadHaves{},
UploadRequest: *ur,
}
}
// IsEmpty a request if empty if Haves are contained in the Wants, or if Wants
// length is zero
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
}
// 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. If flush is true, a flush
// command will be encoded at the end of the writer content.
func (u *UploadHaves) Encode(w io.Writer, flush bool) error {
e := pktline.NewEncoder(w)
plumbing.HashesSort(u.Haves)
var last plumbing.Hash
for _, have := range u.Haves {
if bytes.Equal(last[:], have[:]) {
continue
}
if err := e.Encodef("have %s\n", have); err != nil {
return fmt.Errorf("sending haves for %q: %s", have, err)
}
last = have
}
if flush && len(u.Haves) != 0 {
if err := e.Flush(); err != nil {
return fmt.Errorf("sending flush-pkt after haves: %s", err)
}
}
return nil
}
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