146 lines
4.3 KiB
Nim
146 lines
4.3 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2018 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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import chronos
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import ../varint, ../connection,
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../vbuffer, ../protocol
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const DefaultReadSize: uint = 1024
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const MaxMsgSize* = 1 shl 20 # 1mb
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const MaxChannels* = 1000
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type
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MplexUnknownMsgError* = object of CatchableError
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MessageType* {.pure.} = enum
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New,
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MsgIn,
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MsgOut,
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CloseIn,
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CloseOut,
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ResetIn,
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ResetOut
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ChannelHandler* = proc(conn: Connection) {.gcsafe.}
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Mplex* = ref object of LPProtocol
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remote*: seq[Connection]
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local*: seq[Connection]
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channelHandler*: ChannelHandler
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currentId*: uint
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Channel* = ref object of BufferStream
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id*: int
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initiator*: bool
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reset*: bool
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closedLocal*: bool
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closedRemote*: bool
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mplex*: Mplex
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proc newMplexUnknownMsgError*(): ref MplexUnknownMsgError =
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result = newException(MplexUnknownMsgError, "Unknown mplex message type")
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proc readLp*(conn: Connection): Future[tuple[id: uint, msgType: MessageType]] {.gcsafe.} =
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var
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header: uint
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length: int
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res: VarintStatus
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var buffer = newSeq[byte](10)
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try:
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for i in 0..<len(buffer):
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await conn.readExactly(addr buffer[i], 1)
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res = LP.getUVarint(buffer.toOpenArray(0, i), length, header)
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if res == VarintStatus.Success:
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break
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if res != VarintStatus.Success:
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buffer.setLen(0)
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except TransportIncompleteError:
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buffer.setLen(0)
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result.id = header shl 3
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result.msgType = MessageType(header and 0x7)
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proc writeLp*(conn: Connection, id: uint, msgType: MessageType) {.async, gcsafe.} =
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## write lenght prefixed
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var buf = initVBuffer()
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buf.writeVarint(LPSomeUVarint(id shl 3 or uint(msgType)))
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buf.finish()
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result = conn.write(buf.buffer)
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proc newChannel*(mplex: Mplex,
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id: int,
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initiator: bool,
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handler: WriteHandler,
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size: int = MaxMsgSize): Channel =
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new result
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result.id = id
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result.mplex = mplex
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result.initiator = initiator
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result.writeHandler = handler
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result.maxSize = size
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proc closed*(s: Channel): bool = s.closedLocal and s.closedRemote
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proc closeRemote*(s: Channel) = discard
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proc close*(s: Channel) = discard
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proc newStream*(m: Mplex,
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conn: Connection,
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initiator: bool = true):
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Connection {.gcsafe.}
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proc newMplex*(conn: Connection,
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handler: ChannelHandler,
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maxChanns: uint = MaxChannels): Mplex =
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new result
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result.channelHandler = handler
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proc processNewStream(m: Mplex, conn: Connection) {.async, gcsafe.} =
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discard
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proc procesMessage(m: Mplex, conn: Connection, initiator: bool) {.async, gcsafe.} =
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discard
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proc processClose(m: Mplex, conn: Connection, initiator: bool) {.async, gcsafe.} =
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discard
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proc processReset(m: Mplex, conn: Connection, initiator: bool) {.async, gcsafe.} =
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discard
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proc newStream*(m: Mplex,
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conn: Connection,
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initiator: bool = true):
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Connection {.gcsafe.} =
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## create new channel/stream
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let id = m.currentId
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inc(m.currentId)
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proc writeHandler(data: seq[byte]): Future[void] {.gcsafe.} =
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let msgType = if initiator: MessageType.MsgIn else: MessageType.MsgOut
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await conn.writeLp(id, msgType) # write header
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await conn.writeLp(data) # write data
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let channel = newChannel(m, id, initiator, writeHandler)
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result = newConnection(channel)
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method init(m: Mplex) =
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proc handle(conn: Connection, proto: string) {.async, closure, gcsafe.} =
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let (id, msgType) = await conn.readLp()
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case msgType:
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of MessageType.New:
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await m.processNewStream(conn)
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of MessageType.MsgIn, MessageType.MsgOut:
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await m.procesMessage(conn, bool(ord(msgType) and 1))
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of MessageType.CloseIn, MessageType.CloseOut:
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await m.processClose(conn, bool(ord(msgType) and 1))
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of MessageType.ResetIn, MessageType.ResetOut:
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await m.processReset(conn, bool(ord(msgType) and 1))
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else: raise newMplexUnknownMsgError()
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m.handler = handle
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