nim-libp2p/libp2p/transport.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
import peerinfo, connection, multiaddress, multicodec
type
ConnHandler* = proc (conn: Connection): Future[void] {.gcsafe.}
ConnHolder* = object
connection*: Connection
connFuture*: Future[void]
Transport* = ref object of RootObj
ma*: Multiaddress
connections*: seq[ConnHolder]
handler*: ConnHandler
multicodec*: MultiCodec
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method connHandler*(t: Transport,
server: StreamServer,
client: StreamTransport): Future[Connection] {.base, gcsafe, async.} =
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let conn: Connection = newConnection(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
method init*(t: Transport) {.base, error: "not implemented".} =
## perform protocol initialization
discard
proc newTransport*(t: typedesc[Transport]): t =
new result
result.init()
method close*(t: Transport) {.base, async.} =
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## stop and cleanup the transport
## including all outstanding connections
for c in t.connections:
if c.connection.isOpen:
await c.connection.close()
method listen*(t: Transport, ma: MultiAddress, handler: ConnHandler) {.base, async.} =
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## listen for incoming connections
t.ma = ma
t.handler = handler
method dial*(t: Transport, address: MultiAddress): Future[Connection] {.base, async, error: "not implemented".} =
## dial a peer
discard
method supports(t: Transport, address: MultiAddress): bool {.base, error: "not implemented".} =
## check if transport supportes the multiaddress
# TODO: this should implement generic logic that would use the multicodec
# declared in the multicodec field and set by each individual transport
discard