// writeUser processes a single set of return values from Buffer.Read.
func (wc *writeConn) writeUser(writer *chain.ConnWriter, payload interface{}, seqno SeqNo, err error) (continueWriteLoop bool) {
if err == io.EOF {
// We've reached the EOF of the user write sequence.
// Go back to listen for more reads from the buffer, in case a sync rewinds the buffer cursor.
return true
}
if err == io.ErrUnexpectedEOF {
// An unexpected termination has been reached, indicated by killing the buffer; nothing to send any longer.
return false
}
if err != nil {
panic("u")
}
// Encode chunk
chunk := payload.(*Chunk)
chunk.seqno = seqno // Sequence numbers are assigned 0-based integers
raw, err := chunk.Encode()
if err != nil {
panic(err)
}
writer.Write(raw)
// If connection is closed (no more writes) and the buffer is empty, it is time to kill the connection.
if wc.bfr.Drained() {
return false
}
return true
}
// writeControl processes a single control message (SYNC or ACK).
// ok equals false if the connection is permanently broken and should be killed.
func writeControl(writer *chain.ConnWriter, msg encoder) {
chunk, err := msg.Encode()
if err != nil {
panic(err)
}
writer.Write(chunk)
}