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ChronoSim, the simulation/emulation wrapper around nim-chronos. Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>
94 lines
3.2 KiB
Nim
94 lines
3.2 KiB
Nim
# Copyright (c) 2023 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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# ChronoSim: simulation/emulation wrapper around Chronos
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import
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std/[tables, deques],
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chronos,
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chronicles
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when(true): #enable network emulator
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type
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DatagramCallback* = proc(transp: DatagramTransport,
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remote: TransportAddress): Future[void] {.
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gcsafe, raises: [Defect].}
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DatagramTransport* = ref object
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udata*: pointer # User-driven pointer
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local: TransportAddress # Local address
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callback: DatagramCallback # Receive data callback
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ingress: Deque[seq[byte]]
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egress: Deque[(TransportAddress, seq[byte])] # simple FIFO for now
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var network = initTable[Port, DatagramTransport]()
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proc `$`*(transp: DatagramTransport): string =
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$transp.local
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proc recvFrom[T](transp: DatagramTransport, remote: TransportAddress,
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msg: sink seq[T], msglen = -1) =
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info "recv from ", remote
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{.gcsafe.}:
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transp.ingress.addLast(msg)
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# call the callback on remote
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asyncCheck transp.callback(transp, remote)
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proc getLatency(src: TransportAddress, dst: TransportAddress) : Duration =
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50.milliseconds
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proc getLineTime(transp: DatagramTransport, msg: seq[byte]) : Duration =
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# let bandwith = transp.bandwidth
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let bandwidth = 100 # Bytes/ms = KB/sec
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(msg.len div bandwidth).milliseconds
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proc sendTo*[T](transp: DatagramTransport, remote: TransportAddress,
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msg: sink seq[T], msglen = -1) {.async.} =
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#transp.egress.addLast(remote, msg)
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#await sleepAsync(getLineTime(transp, msg))
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await sleepAsync(getLatency(transp.local, remote))
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{.gcsafe.}:
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network[remote.port].recvFrom(transp.local, msg)
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proc getMessage*(t: DatagramTransport,): seq[byte] {.
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raises: [Defect, CatchableError].} =
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#echo "getMessage "
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t.ingress.popFirst()
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proc close*(transp: DatagramTransport) =
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debug "close"
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proc closed*(transp: DatagramTransport): bool {.inline.} =
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result = false
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proc closeWait*(transp: DatagramTransport) {.async.} =
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debug "closeWait "
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proc getUserData*[T](transp: DatagramTransport): T {.inline.} =
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## Obtain user data stored in ``transp`` object.
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result = cast[T](transp.udata)
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proc newDatagramTransport*[T](cbproc: DatagramCallback,
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udata: ref T,
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local: TransportAddress = AnyAddress,
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): DatagramTransport {.
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raises: [Defect, CatchableError].} =
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debug "new"
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result = DatagramTransport()
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GC_ref(udata)
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result.udata = cast[pointer](udata)
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result.local = local
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result.callback = cbproc
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{.gcsafe.}:
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network[local.port] = result
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export seconds, milliseconds
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export TransportAddress, initTAddress
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export async, sleepAsync, complete, await
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export Future, FutureBase, newFuture, futureContinue
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export TransportOsError |