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Fix transaction ID size

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This commit is contained in:
Sasha Koshka 2025-01-19 14:21:58 -05:00
parent dc560075d7
commit c748ca2223
2 changed files with 10 additions and 10 deletions
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2
design/protocol.md
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@ -136,7 +136,7 @@ Internet.
### METADAPT-A
METADAPT-A requires a transport which offers a single full-duplex data stream
that persists for the duration of the connection. All transactions are
multiplexed onto this single stream. Each MMB contains a 8-octet long header,
multiplexed onto this single stream. Each MMB contains a 12-octet long header,
with the transaction ID, then the method, and then the payload size (in octets).
The transaction ID is encoded as an I64, and the method and payload size are
both encoded as U16s. The remainder of the message is the payload. Since each

18
metadapta.go
View File

@ -174,14 +174,14 @@ type incomingMessage struct {
}
func decodeMessageA(reader io.Reader) (int64, uint16, []byte, error) {
headerBuffer := [8]byte { }
headerBuffer := [12]byte { }
_, err := io.ReadFull(reader, headerBuffer[:])
if err != nil { return 0, 0, nil, err }
transID, err := tape.DecodeI64[int64](headerBuffer[:4])
transID, err := tape.DecodeI64[int64](headerBuffer[:8])
if err != nil { return 0, 0, nil, err }
method, err := tape.DecodeI16[uint16](headerBuffer[4:6])
method, err := tape.DecodeI16[uint16](headerBuffer[8:10])
if err != nil { return 0, 0, nil, err }
length, err := tape.DecodeI16[uint16](headerBuffer[6:8])
length, err := tape.DecodeI16[uint16](headerBuffer[10:12])
if err != nil { return 0, 0, nil, err }
payloadBuffer := make([]byte, int(length))
_, err = io.ReadFull(reader, payloadBuffer)
@ -190,13 +190,13 @@ func decodeMessageA(reader io.Reader) (int64, uint16, []byte, error) {
}
func encodeMessageA(writer io.Writer, trans int64, method uint16, data []byte) error {
buffer := make([]byte, 8 + len(data))
tape.EncodeI64(buffer[:4], trans)
tape.EncodeI16(buffer[4:6], method)
buffer := make([]byte, 12 + len(data))
tape.EncodeI64(buffer[:8], trans)
tape.EncodeI16(buffer[8:10], method)
length, ok := tape.U16CastSafe(len(data))
if !ok { return ErrPayloadTooLarge }
tape.EncodeI16(data[6:8], length)
copy(buffer[8:], data)
tape.EncodeI16(data[10:12], length)
copy(buffer[12:], data)
_, err := writer.Write(buffer)
return err
}