/
upload_pack_session.go
157 lines (141 loc) · 4.12 KB
/
upload_pack_session.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright © 2021 Wrangle Ltd
package apiserver
import (
"compress/gzip"
"encoding/json"
"io/ioutil"
"net/http"
"github.com/google/uuid"
"github.com/wrgl/core/pkg/api"
"github.com/wrgl/core/pkg/api/payload"
apiutils "github.com/wrgl/core/pkg/api/utils"
"github.com/wrgl/core/pkg/objects"
"github.com/wrgl/core/pkg/ref"
)
type stateFn func(rw http.ResponseWriter, r *http.Request) (nextState stateFn)
func parseUploadPackRequest(r *http.Request) (req *payload.UploadPackRequest, err error) {
b, err := ioutil.ReadAll(r.Body)
if err != nil {
return
}
req = &payload.UploadPackRequest{}
err = json.Unmarshal(b, req)
if err != nil {
return nil, err
}
return
}
type UploadPackSession struct {
db objects.Store
id uuid.UUID
finder *apiutils.ClosedSetsFinder
sender *apiutils.ObjectSender
state stateFn
maxPackfileSize uint64
}
func NewUploadPackSession(db objects.Store, rs ref.Store, id uuid.UUID, maxPackfileSize uint64) *UploadPackSession {
s := &UploadPackSession{
db: db,
id: id,
finder: apiutils.NewClosedSetsFinder(db, rs),
maxPackfileSize: maxPackfileSize,
}
s.state = s.greet
return s
}
func (s *UploadPackSession) sendACKs(rw http.ResponseWriter, r *http.Request, acks [][]byte) (nextState stateFn) {
rw.Header().Set("Content-Type", api.CTJSON)
http.SetCookie(rw, &http.Cookie{
Name: api.CookieUploadPackSession,
Value: s.id.String(),
Path: r.URL.Path,
HttpOnly: true,
MaxAge: 3600 * 3,
})
resp := &payload.UploadPackResponse{}
for _, ack := range acks {
resp.ACKs = payload.AppendHex(resp.ACKs, ack)
}
b, err := json.Marshal(resp)
if err != nil {
panic(err)
}
_, err = rw.Write(b)
if err != nil {
panic(err)
}
return s.negotiate
}
func (s *UploadPackSession) sendPackfile(rw http.ResponseWriter, r *http.Request) (nextState stateFn) {
var err error
if s.sender == nil {
s.sender, err = apiutils.NewObjectSender(s.db, s.finder.CommitsToSend(), s.finder.CommonCommmits(), s.maxPackfileSize)
if err != nil {
panic(err)
}
}
rw.Header().Set("Content-Type", api.CTPackfile)
rw.Header().Set("Content-Encoding", "gzip")
rw.Header().Set("Trailer", api.HeaderPurgeUploadPackSession)
http.SetCookie(rw, &http.Cookie{
Name: api.CookieUploadPackSession,
Value: s.id.String(),
Path: r.URL.Path,
HttpOnly: true,
MaxAge: 3600 * 3,
})
gzw := gzip.NewWriter(rw)
defer gzw.Close()
done, err := s.sender.WriteObjects(gzw)
if err != nil {
panic(err)
}
if done {
rw.Header().Set(api.HeaderPurgeUploadPackSession, "true")
return nil
}
return s.sendPackfile
}
func (s *UploadPackSession) findClosedSets(rw http.ResponseWriter, r *http.Request, req *payload.UploadPackRequest) (nextState stateFn) {
acks, err := s.finder.Process(payload.HexSliceToBytesSlice(req.Wants), payload.HexSliceToBytesSlice(req.Haves), req.Done)
if err != nil {
if v, ok := err.(*apiutils.UnrecognizedWantsError); ok {
http.Error(rw, v.Error(), http.StatusBadRequest)
return nil
}
panic(err)
}
if len(acks) > 0 && len(s.finder.Wants) > 0 && !req.Done {
return s.sendACKs(rw, r, acks)
}
return s.sendPackfile(rw, r)
}
func (s *UploadPackSession) greet(rw http.ResponseWriter, r *http.Request) (nextState stateFn) {
req, err := parseUploadPackRequest(r)
if err != nil {
panic(err)
}
if len(req.Wants) == 0 {
http.Error(rw, "empty wants list", http.StatusBadRequest)
return nil
}
return s.findClosedSets(rw, r, req)
}
func (s *UploadPackSession) negotiate(rw http.ResponseWriter, r *http.Request) (nextState stateFn) {
req, err := parseUploadPackRequest(r)
if err != nil {
panic(err)
}
return s.findClosedSets(rw, r, req)
}
// ServeHTTP negotiates which commits to be sent and send them in one or more packfiles,
// returns true when this session is completed and should be removed.
func (s *UploadPackSession) ServeHTTP(rw http.ResponseWriter, r *http.Request) bool {
if ct := r.Header.Get("Content-Type"); ct != api.CTJSON {
http.Error(rw, "", http.StatusUnsupportedMediaType)
return true
}
s.state = s.state(rw, r)
return s.state == nil
}