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package packp
import (
"bytes"
"fmt"
"io"
"time"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/format/pktline"
)
// Encode writes the UlReq encoding of u to the stream.
//
// All the payloads will end with a newline character. Wants and
// shallows are sorted alphabetically. A depth of 0 means no depth
// request is sent.
func (req *UploadRequest) Encode(w io.Writer) error {
e := newUlReqEncoder(w)
return e.Encode(req)
}
type ulReqEncoder struct {
pe *pktline.Encoder // where to write the encoded data
data *UploadRequest // the data to encode
err error // sticky error
}
func newUlReqEncoder(w io.Writer) *ulReqEncoder {
return &ulReqEncoder{
pe: pktline.NewEncoder(w),
}
}
func (e *ulReqEncoder) Encode(v *UploadRequest) error {
e.data = v
if len(v.Wants) == 0 {
return fmt.Errorf("empty wants provided")
}
plumbing.HashesSort(e.data.Wants)
for state := e.encodeFirstWant; state != nil; {
state = state()
}
return e.err
}
func (e *ulReqEncoder) encodeFirstWant() stateFn {
var err error
if e.data.Capabilities.IsEmpty() {
err = e.pe.Encodef("want %s\n", e.data.Wants[0])
} else {
err = e.pe.Encodef(
"want %s %s\n",
e.data.Wants[0],
e.data.Capabilities.String(),
)
}
if err != nil {
e.err = fmt.Errorf("encoding first want line: %s", err)
return nil
}
return e.encodeAdditionalWants
}
func (e *ulReqEncoder) encodeAdditionalWants() stateFn {
last := e.data.Wants[0]
for _, w := range e.data.Wants[1:] {
if bytes.Equal(last[:], w[:]) {
continue
}
if err := e.pe.Encodef("want %s\n", w); err != nil {
e.err = fmt.Errorf("encoding want %q: %s", w, err)
return nil
}
last = w
}
return e.encodeShallows
}
func (e *ulReqEncoder) encodeShallows() stateFn {
plumbing.HashesSort(e.data.Shallows)
var last plumbing.Hash
for _, s := range e.data.Shallows {
if bytes.Equal(last[:], s[:]) {
continue
}
if err := e.pe.Encodef("shallow %s\n", s); err != nil {
e.err = fmt.Errorf("encoding shallow %q: %s", s, err)
return nil
}
last = s
}
return e.encodeDepth
}
func (e *ulReqEncoder) encodeDepth() stateFn {
switch depth := e.data.Depth.(type) {
case DepthCommits:
if depth != 0 {
commits := int(depth)
if err := e.pe.Encodef("deepen %d\n", commits); err != nil {
e.err = fmt.Errorf("encoding depth %d: %s", depth, err)
return nil
}
}
case DepthSince:
when := time.Time(depth).UTC()
if err := e.pe.Encodef("deepen-since %d\n", when.Unix()); err != nil {
e.err = fmt.Errorf("encoding depth %s: %s", when, err)
return nil
}
case DepthReference:
reference := string(depth)
if err := e.pe.Encodef("deepen-not %s\n", reference); err != nil {
e.err = fmt.Errorf("encoding depth %s: %s", reference, err)
return nil
}
default:
e.err = fmt.Errorf("unsupported depth type")
return nil
}
return e.encodeFilter
}
func (e *ulReqEncoder) encodeFilter() stateFn {
if filter := e.data.Filter; filter != "" {
if err := e.pe.Encodef("filter %s\n", filter); err != nil {
e.err = fmt.Errorf("encoding filter %s: %s", filter, err)
return nil
}
}
return e.encodeFlush
}
func (e *ulReqEncoder) encodeFlush() stateFn {
if err := e.pe.Flush(); err != nil {
e.err = fmt.Errorf("encoding flush-pkt: %s", err)
return nil
}
return nil
}
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