func (s *ApiServer) ForwardFetchFeed(ctx context.Context, req *pb.FeedRequest) (*pb.Feed, error) {
if req.PageSize <= 0 || req.PageSize >= 100 {
req.PageSize = 50
}
profile, err := store.GetProfile(s.mdb, req.Id)
if err != nil {
return nil, err
}
uuid1, _ := uuid.FromString(profile.Uuid)
preKey := store.NewUUIDKey(store.TableReverseEntryIndex, uuid1)
log.Println("forward seeking:", preKey.String())
start := req.Start
var entries []*pb.Entry
_, err = store.ForwardTableScan(s.rdb, preKey, func(i int, k, v []byte) error {
if start > 0 {
start--
return nil // continue
}
entry := new(pb.Entry)
rawdata, err := s.rdb.Get(v) // index value point to entry key
if err != nil || len(rawdata) == 0 {
return fmt.Errorf("entry data missing")
}
if err := proto.Unmarshal(rawdata, entry); err != nil {
return err
}
if err = FormatFeedEntry(s.mdb, req, entry); err != nil {
return err
}
entries = append(entries, entry)
if i > int(req.PageSize+req.Start) {
return &store.Error{"ok", store.StopIteration}
}
return nil
})
if err != nil {
return nil, err
}
feed := &pb.Feed{
Uuid: profile.Uuid,
Id: profile.Id,
Name: profile.Name,
Picture: profile.Picture,
Type: profile.Type,
Private: profile.Private,
SupId: profile.SupId,
Description: profile.Description,
Entries: entries[:],
}
return feed, nil
}
func (s *ApiServer) cachedFeed(req *pb.FeedRequest) (*pb.Feed, error) {
if req.PageSize <= 0 || req.PageSize >= 100 {
req.PageSize = 50
}
start := req.Start
index := s.cached[req.Id]
var entries []*pb.Entry
found := 0
for i := 0; i < len(index.bufq); i++ {
if start > 0 {
start--
continue
}
key := index.bufq[i]
if key == "" {
break
}
kb, _ := hex.DecodeString(key)
entry := new(pb.Entry)
rawdata, err := s.rdb.Get(kb)
if err != nil || len(rawdata) == 0 {
return nil, fmt.Errorf("entry data missing")
}
if err := proto.Unmarshal(rawdata, entry); err != nil {
return nil, err
}
FormatFeedEntry(s.mdb, req, entry)
entries = append(entries, entry)
found++
if found > int(req.PageSize) {
break
}
}
feed := &pb.Feed{
Uuid: "Public",
Id: "Public",
Name: "Everyone's feed",
Type: "group",
Private: false,
SupId: "0000-00",
Entries: entries[:],
}
return feed, nil
}