157 lines
5.4 KiB
Nim
157 lines
5.4 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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## TODO:
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## Timeouts and message limits are still missing
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## they need to be added ASAP
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import tables, sequtils, options
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import chronos, chronicles
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import ../muxer,
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../../connection,
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../../stream/lpstream,
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coder,
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types,
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lpchannel
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logScope:
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topic = "Mplex"
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type
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Mplex* = ref object of Muxer
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remote*: Table[uint, LPChannel]
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local*: Table[uint, LPChannel]
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currentId*: uint
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maxChannels*: uint
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proc getChannelList(m: Mplex, initiator: bool): var Table[uint, LPChannel] =
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if initiator:
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trace "picking local channels", initiator = initiator
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result = m.local
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else:
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trace "picking remote channels", initiator = initiator
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result = m.remote
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proc newStreamInternal*(m: Mplex,
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initiator: bool = true,
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chanId: uint = 0,
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name: string = "",
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lazy: bool = false):
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Future[LPChannel] {.async, gcsafe.} =
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## create new channel/stream
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let id = if initiator: m.currentId.inc(); m.currentId else: chanId
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trace "creating new channel", channelId = id, initiator = initiator
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result = newChannel(id, m.connection, initiator, name, lazy = lazy)
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m.getChannelList(initiator)[id] = result
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proc cleanupChann(m: Mplex, chann: LPChannel, initiator: bool) {.async, inline.} =
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## call the channel's `close` to signal the
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## remote that the channel is closing
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if not isNil(chann) and not chann.closed:
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await chann.close()
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await chann.cleanUp()
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m.getChannelList(initiator).del(chann.id)
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trace "cleaned up channel", id = chann.id
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method handle*(m: Mplex) {.async, gcsafe.} =
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trace "starting mplex main loop"
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try:
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while not m.connection.closed:
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trace "waiting for data"
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let msg = await m.connection.readMsg()
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if msg.isNone:
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trace "connection EOF"
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# TODO: allow poll with timeout to avoid using `sleepAsync`
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await sleepAsync(1.millis)
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continue
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let (id, msgType, data) = msg.get()
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let initiator = bool(ord(msgType) and 1)
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var channel: LPChannel
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if MessageType(msgType) != MessageType.New:
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let channels = m.getChannelList(initiator)
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if id notin channels:
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trace "Channel not found, skipping", id = id,
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initiator = initiator,
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msg = msgType
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await sleepAsync(1.millis)
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continue
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channel = channels[id]
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case msgType:
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of MessageType.New:
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let name = cast[string](data)
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channel = await m.newStreamInternal(false, id, name)
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trace "created channel", id = id, name = name, inititator = true
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if not isNil(m.streamHandler):
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let stream = newConnection(channel)
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stream.peerInfo = m.connection.peerInfo
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# cleanup channel once handler is finished
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# stream.closeEvent.wait().addCallback(
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# proc(udata: pointer) =
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# asyncCheck cleanupChann(m, channel, initiator))
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asyncCheck m.streamHandler(stream)
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continue
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of MessageType.MsgIn, MessageType.MsgOut:
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trace "pushing data to channel", id = id,
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initiator = initiator,
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msgType = msgType
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await channel.pushTo(data)
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of MessageType.CloseIn, MessageType.CloseOut:
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trace "closing channel", id = id,
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initiator = initiator,
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msgType = msgType
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await channel.closedByRemote()
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# m.getChannelList(initiator).del(id)
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of MessageType.ResetIn, MessageType.ResetOut:
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trace "resetting channel", id = id,
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initiator = initiator,
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msgType = msgType
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await channel.resetByRemote()
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m.getChannelList(initiator).del(id)
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break
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except CatchableError as exc:
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trace "exception occurred", exception = exc.msg
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finally:
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trace "stopping mplex main loop"
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if not m.connection.closed():
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await m.connection.close()
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proc newMplex*(conn: Connection,
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maxChanns: uint = MaxChannels): Mplex =
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new result
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result.connection = conn
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result.maxChannels = maxChanns
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result.remote = initTable[uint, LPChannel]()
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result.local = initTable[uint, LPChannel]()
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let m = result
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conn.closeEvent.wait()
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.addCallback do (udata: pointer):
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trace "connection closed, cleaning up mplex"
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asyncCheck m.close()
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method newStream*(m: Mplex, name: string = "", lazy: bool = false): Future[Connection] {.async, gcsafe.} =
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let channel = await m.newStreamInternal(lazy = lazy)
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if not lazy:
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await channel.open()
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result = newConnection(channel)
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result.peerInfo = m.connection.peerInfo
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method close*(m: Mplex) {.async, gcsafe.} =
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trace "closing mplex muxer"
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await allFutures(@[allFutures(toSeq(m.remote.values).mapIt(it.reset())),
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allFutures(toSeq(m.local.values).mapIt(it.reset()))])
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