nim-libp2p-experimental/libp2p/transports/tcptransport.nim

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## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import chronos, chronicles, sequtils
import transport,
../wire,
../connection,
../multiaddress,
../multicodec,
../stream/chronosstream
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logScope:
topic = "TcpTransport"
type TcpTransport* = ref object of Transport
server*: StreamServer
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proc connHandler*(t: Transport,
server: StreamServer,
client: StreamTransport,
initiator: bool = false):
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Future[Connection] {.async, gcsafe.} =
trace "handling connection for", address = $client.remoteAddress
let conn: Connection = newConnection(newChronosStream(server, client))
conn.observedAddrs = MultiAddress.init(client.remoteAddress)
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if not initiator:
let handlerFut = if t.handler == nil: nil else: t.handler(conn)
let connHolder: ConnHolder = ConnHolder(connection: conn,
connFuture: handlerFut)
t.connections.add(connHolder)
result = conn
proc connCb(server: StreamServer,
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client: StreamTransport) {.async, gcsafe.} =
trace "incomming connection for", address = $client.remoteAddress
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let t: Transport = cast[Transport](server.udata)
discard t.connHandler(server, client)
method init*(t: TcpTransport) =
t.multicodec = multiCodec("tcp")
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method close*(t: TcpTransport): Future[void] {.async, gcsafe.} =
## start the transport
trace "stopping transport"
await procCall Transport(t).close() # call base
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t.server.stop()
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t.server.close()
trace "transport stopped"
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method listen*(t: TcpTransport,
ma: MultiAddress,
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handler: ConnHandler):
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Future[Future[void]] {.async, gcsafe.} =
discard await procCall Transport(t).listen(ma, handler) # call base
## listen on the transport
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t.server = createStreamServer(t.ma, connCb, {}, t)
t.server.start()
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# always get the resolved address in case we're bound to 0.0.0.0:0
t.ma = MultiAddress.init(t.server.sock.getLocalAddress())
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result = t.server.join()
trace "started node on", address = t.ma
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method dial*(t: TcpTransport,
address: MultiAddress):
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Future[Connection] {.async, gcsafe.} =
trace "dialing remote peer", address = $address
## dial a peer
let client: StreamTransport = await connect(address)
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result = await t.connHandler(t.server, client, true)
method handles*(t: TcpTransport, address: MultiAddress): bool {.gcsafe.} =
if procCall Transport(t).handles(address):
result = address.protocols.filterIt( it == multiCodec("tcp") ).len > 0