// ReadErrorResponse reads an "Exception" message from the OrientDB server.
// The OrientDB server can return multiple exceptions, all of which are
// incorporated into a single OServerException Error struct.
// If error (the second return arg) is not nil, then there was a
// problem reading the server exception on the wire.
func readErrorResponse(r *rw.Reader) (serverException error) {
var (
exClass, exMsg string
)
exc := make([]orient.Exception, 0, 1) // usually only one ?
for {
// before class/message combo there is a 1 (continue) or 0 (no more)
marker := r.ReadByte()
if marker == byte(0) {
break
}
exClass = r.ReadString()
exMsg = r.ReadString()
exc = append(exc, orient.UnknownException{Class: exClass, Message: exMsg})
}
// Next there *may* a serialized exception of bytes, but it is only
// useful to Java clients, so read and ignore if present.
// If there is no serialized exception, EOF will be returned
_ = r.ReadBytes()
for _, e := range exc {
switch e.ExcClass() {
case "com.orientechnologies.orient.core.storage.ORecordDuplicatedException":
return ODuplicatedRecordException{OServerException: orient.OServerException{Exceptions: exc}}
}
}
return orient.OServerException{Exceptions: exc}
}
func (db *Database) readIdentifiable(r *rw.Reader) (orient.OIdentifiable, error) {
classId := r.ReadShort()
if err := r.Err(); err != nil {
return nil, err
}
switch classId {
case RecordNull:
return nil, nil
case RecordRID:
var rid orient.RID
if err := rid.FromStream(r); err != nil {
return nil, err
}
return rid, nil
default:
tp := orient.RecordType(r.ReadByte())
if err := r.Err(); err != nil {
return nil, err
}
record := orient.NewRecordOfType(tp)
switch rec := record.(type) {
case *orient.Document:
rec.SetSerializer(db.sess.cli.recordFormat)
}
var rid orient.RID
if err := rid.FromStream(r); err != nil {
return nil, err
}
version := int(r.ReadInt())
content := r.ReadBytes()
if err := record.Fill(rid, version, content); err != nil {
return nil, fmt.Errorf("cannot create record %T from content: %s", record, err)
}
return record, nil
}
}