88 lines
3.0 KiB
Nim
88 lines
3.0 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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import chronos, chronicles, sequtils
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import transport,
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../wire,
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../connection,
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../multiaddress,
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../multicodec,
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../stream/chronosstream
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logScope:
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topic = "TcpTransport"
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type TcpTransport* = ref object of Transport
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server*: StreamServer
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proc connHandler*(t: Transport,
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server: StreamServer,
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client: StreamTransport,
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initiator: bool = false):
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Future[Connection] {.async, gcsafe.} =
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trace "handling connection for", address = $client.remoteAddress
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let conn: Connection = newConnection(newChronosStream(server, client))
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conn.observedAddrs = MultiAddress.init(client.remoteAddress)
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if not initiator:
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let handlerFut = if isNil(t.handler): nil else: t.handler(conn)
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let connHolder: ConnHolder = ConnHolder(connection: conn,
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connFuture: handlerFut)
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# TODO: this needs rethinking,
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# currently it leaks since there
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# is no way to delete the conn on close
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# t.connections.add(connHolder)
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result = conn
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proc connCb(server: StreamServer,
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client: StreamTransport) {.async, gcsafe.} =
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trace "incomming connection for", address = $client.remoteAddress
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let t: Transport = cast[Transport](server.udata)
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asyncCheck t.connHandler(server, client)
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method init*(t: TcpTransport) =
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t.multicodec = multiCodec("tcp")
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method close*(t: TcpTransport): Future[void] {.async, gcsafe.} =
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## start the transport
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trace "stopping transport"
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await procCall Transport(t).close() # call base
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# server can be nil
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if t.server != nil:
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t.server.stop()
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t.server.close()
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trace "transport stopped"
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method listen*(t: TcpTransport,
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ma: MultiAddress,
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handler: ConnHandler):
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Future[Future[void]] {.async, gcsafe.} =
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discard await procCall Transport(t).listen(ma, handler) # call base
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## listen on the transport
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t.server = createStreamServer(t.ma, connCb, {}, t)
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t.server.start()
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# always get the resolved address in case we're bound to 0.0.0.0:0
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t.ma = MultiAddress.init(t.server.sock.getLocalAddress())
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result = t.server.join()
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trace "started node on", address = t.ma
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method dial*(t: TcpTransport,
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address: MultiAddress):
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Future[Connection] {.async, gcsafe.} =
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trace "dialing remote peer", address = $address
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## dial a peer
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let client: StreamTransport = await connect(address)
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result = await t.connHandler(t.server, client, true)
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method handles*(t: TcpTransport, address: MultiAddress): bool {.gcsafe.} =
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if procCall Transport(t).handles(address):
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result = address.protocols.filterIt( it == multiCodec("tcp") ).len > 0
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