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Improve serialization implementation (#403)

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KonradStaniec 2021-10-06 11:36:37 +02:00 committed by GitHub
parent 1babe38226
commit 32ef1b7f4f
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1 changed files with 21 additions and 25 deletions
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46
eth/utp/packets.nim
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@ -69,33 +69,29 @@ proc encodeTypeVer(h: PacketHeaderV1): uint8 =
typeVer = (typeVer and 0xf) or (typeOrd shl 4)
typeVer
proc encodeHeader*(h: PacketHeaderV1): seq[byte] =
var mem = memoryOutput().s
proc encodeHeaderStream(s: var OutputStream, h: PacketHeaderV1) =
try:
mem.write(encodeTypeVer(h))
mem.write(h.extension)
mem.write(h.connectionId.toBytesBE())
mem.write(h.timestamp.toBytesBE())
mem.write(h.timestampDiff.toBytesBE())
mem.write(h.wndSize.toBytesBE())
mem.write(h.seqNr.toBytesBE())
mem.write(h.ackNr.toBytesBE())
return mem.getOutput()
s.write(encodeTypeVer(h))
s.write(h.extension)
s.write(h.connectionId.toBytesBE())
s.write(h.timestamp.toBytesBE())
s.write(h.timestampDiff.toBytesBE())
s.write(h.wndSize.toBytesBE())
s.write(h.seqNr.toBytesBE())
s.write(h.ackNr.toBytesBE())
except IOError as e:
# TODO not sure how writing to memory buffer could throw. Raise assertion error if
# its happen for now
# This should not happen in case of in-memory streams
raiseAssert e.msg
proc encodePacket*(p: Packet): seq[byte] =
var mem = memoryOutput().s
var s = memoryOutput().s
try:
mem.write(encodeHeader(p.header))
encodeHeaderStream(s, p.header)
if (len(p.payload) > 0):
mem.write(p.payload)
mem.getOutput()
s.write(p.payload)
s.getOutput()
except IOError as e:
# TODO not sure how writing to memory buffer could throw. Raise assertion error if
# its happen for now
# This should not happen in case of in-memory streams
raiseAssert e.msg
# TODO for now we do not handle extensions
@ -116,12 +112,12 @@ proc decodePacket*(bytes: openArray[byte]): Result[Packet, string] =
pType: kind,
version: version,
extension: bytes[1],
connection_id: fromBytesBE(uint16, [bytes[2], bytes[3]]),
timestamp: fromBytesBE(uint32, [bytes[4], bytes[5], bytes[6], bytes[7]]),
timestamp_diff: fromBytesBE(uint32, [bytes[8], bytes[9], bytes[10], bytes[11]]),
wnd_size: fromBytesBE(uint32, [bytes[12], bytes[13], bytes[14], bytes[15]]),
seq_nr: fromBytesBE(uint16, [bytes[16], bytes[17]]),
ack_nr: fromBytesBE(uint16, [bytes[18], bytes[19]]),
connection_id: fromBytesBE(uint16, bytes.toOpenArray(2, 3)),
timestamp: fromBytesBE(uint32, bytes.toOpenArray(4, 7)),
timestamp_diff: fromBytesBE(uint32, bytes.toOpenArray(8, 11)),
wnd_size: fromBytesBE(uint32, bytes.toOpenArray(12, 15)),
seq_nr: fromBytesBE(uint16, bytes.toOpenArray(16, 17)),
ack_nr: fromBytesBE(uint16, bytes.toOpenArray(18, 19)),
)
let payload =