| 1 | // INCREMENT codec (method 1) -- 8-byte payload: { u64 value } |
| 2 | |
| 3 | package protocol |
| 4 | |
| 5 | const IncrementPayloadSize = 8 |
| 6 | |
| 7 | // IncrementEncode writes a u64 value into buf. Returns 8 on success, 0 if |
| 8 | // buf is too small. |
| 9 | func IncrementEncode(value uint64, buf []byte) int { |
| 10 | if len(buf) < IncrementPayloadSize { |
| 11 | return 0 |
| 12 | } |
| 13 | ne.PutUint64(buf[:8], value) |
| 14 | return IncrementPayloadSize |
| 15 | } |
| 16 | |
| 17 | // IncrementDecode reads a u64 value from buf. |
| 18 | func IncrementDecode(buf []byte) (uint64, error) { |
| 19 | if len(buf) < IncrementPayloadSize { |
| 20 | return 0, ErrTruncated |
| 21 | } |
| 22 | return ne.Uint64(buf[:8]), nil |
| 23 | } |
| 24 | |
| 25 | // DispatchIncrement decodes request, calls handler, encodes response. |
| 26 | func DispatchIncrement(req []byte, resp []byte, handler func(uint64) (uint64, bool)) (int, bool) { |
| 27 | value, err := IncrementDecode(req) |
| 28 | if err != nil { |
| 29 | return 0, false |
| 30 | } |
| 31 | result, ok := handler(value) |
| 32 | if !ok { |
| 33 | return 0, false |
| 34 | } |
| 35 | n := IncrementEncode(result, resp) |
| 36 | return n, n > 0 |
| 37 | } |