func read(reuseBuf *Header, r io.Reader) (int, *Ins, error) {
header := reuseBuf[:]
var expectMsgId *uint64
if r, ok := r.(*utils.Bufio); ok {
off := uint64(r.Offset(-1))
expectMsgId = &off
}
n, err := io.ReadFull(r, header)
nRead := n
if err != nil {
return n, nil, logex.Trace(err)
}
var length uint32
if err := ReadHeader(header, &length); err != nil {
return n, nil, logex.Trace(err)
}
content := make([]byte, SizeMsgHeader+int(length))
n, err = io.ReadFull(r, content[SizeMsgHeader:])
nRead += n
if err != nil {
return nRead, nil, logex.Trace(err)
}
copy(content, header)
m, err := Decode(content)
if err != nil {
return nRead, nil, logex.Trace(err)
}
if expectMsgId != nil && m.MsgId != *expectMsgId {
return nRead, nil, ErrMsgIdNotMatch.Trace(*expectMsgId, m.MsgId)
}
return nRead, m, nil
}