nim-libp2p/libp2p/tcptransport.nim

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## Nim-LibP2P
## Copyright (c) 2018 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
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import transport, wire, connection,
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multiaddress, connection,
multicodec, chronosstream
type TcpTransport* = ref object of Transport
server*: StreamServer
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proc connHandler*(t: Transport,
server: StreamServer,
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client: StreamTransport):
Future[Connection] {.async, gcsafe.} =
let conn: Connection = newConnection(newChronosStream(server, client))
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.} =
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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
await procCall Transport(t).close() # call base
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t.server.stop()
await t.server.closeWait()
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method listen*(t: TcpTransport,
ma: MultiAddress,
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handler: ConnHandler):
Future[void] {.async, gcsafe.} =
await procCall Transport(t).listen(ma, handler) # call base
## listen on the transport
let listenFuture: Future[void] = newFuture[void]()
result = listenFuture
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let server = createStreamServer(t.ma, connCb, {}, t)
t.server = server
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server.start()
listenFuture.complete()
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method dial*(t: TcpTransport,
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address: MultiAddress):
Future[Connection] {.async, gcsafe.} =
## dial a peer
let client: StreamTransport = await connect(address)
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result = await t.connHandler(t.server, client)
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method handles*(t: Transport, address: MultiAddress): bool {.gcsafe.} = true