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9f2f101070
* Add initial impl of utp over udp * Add more comments * Add licenses and push declarations * Add tests to nimble task * Pr comments Use better random generator Raise assert error in case of buffer io exception
62 lines
2.2 KiB
Nim
62 lines
2.2 KiB
Nim
# Copyright (c) 2020-2021 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [Defect].}
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import
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chronos, chronicles, bearssl,
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./packets,
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../keys
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logScope:
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topics = "utp"
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type
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# For now utp protocol is tied to udp transport, but ultimatly we would like to
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# abstract underlying transport to be able to run utp over udp, discoveryv5 or
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# maybe some test transport
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UtpProtocol* = ref object
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transport: DatagramTransport
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rng*: ref BrHmacDrbgContext
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UtpSocket* = ref object
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# TODO not implemented
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# for now just log incoming packets
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proc processPacket(p: Packet) =
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notice "Received packet ", packet = p
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# Connect to provided address
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# Reference implementation: https://github.com/bittorrent/libutp/blob/master/utp_internal.cpp#L2732
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# TODO not implemented
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proc connectTo*(p: UtpProtocol, address: TransportAddress): Future[UtpSocket] {.async.} =
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let packet = synPacket(p.rng[], randUint16(p.rng[]), 1048576)
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notice "Sending packet", packet = packet
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let packetEncoded = encodePacket(packet)
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await p.transport.sendTo(address, packetEncoded)
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return UtpSocket()
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proc processDatagram(transp: DatagramTransport, raddr: TransportAddress):
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Future[void] {.async.} =
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# TODO: should we use `peekMessage()` to avoid allocation?
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let buf = try: transp.getMessage()
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except TransportOsError as e:
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# This is likely to be local network connection issues.
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return
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let dec = decodePacket(buf)
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if (dec.isOk()):
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processPacket(dec.get())
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else:
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warn "failed to decode packet from address", address = raddr
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proc new*(T: type UtpProtocol, address: TransportAddress, rng = newRng()): UtpProtocol {.raises: [Defect, CatchableError].} =
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let ta = newDatagramTransport(processDatagram, local = address)
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UtpProtocol(transport: ta, rng: rng)
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proc closeWait*(p: UtpProtocol): Future[void] =
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p.transport.closeWait()
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