nim-libp2p/libp2p/transports/tcptransport.nim

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## Nim-LibP2P
2019-09-24 17:48:23 +00:00
## 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,
../errors,
../wire,
../connection,
../multiaddress,
../multicodec,
../stream/chronosstream
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logScope:
topic = "TcpTransport"
const
TcpTransportTrackerName* = "libp2p.tcptransport"
type
TcpTransport* = ref object of Transport
server*: StreamServer
cleanups*: seq[Future[void]]
handlers*: seq[Future[void]]
TcpTransportTracker* = ref object of TrackerBase
opened*: uint64
closed*: uint64
proc setupTcpTransportTracker(): TcpTransportTracker {.gcsafe.}
proc getTcpTransportTracker(): TcpTransportTracker {.gcsafe.} =
result = cast[TcpTransportTracker](getTracker(TcpTransportTrackerName))
if isNil(result):
result = setupTcpTransportTracker()
proc dumpTracking(): string {.gcsafe.} =
var tracker = getTcpTransportTracker()
result = "Opened transports: " & $tracker.opened & "\n" &
"Closed transports: " & $tracker.closed
proc leakTransport(): bool {.gcsafe.} =
var tracker = getTcpTransportTracker()
result = (tracker.opened != tracker.closed)
proc setupTcpTransportTracker(): TcpTransportTracker =
result = new TcpTransportTracker
result.opened = 0
result.closed = 0
result.dump = dumpTracking
result.isLeaked = leakTransport
addTracker(TcpTransportTrackerName, result)
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proc cleanup(t: Transport, conn: Connection) {.async.} =
await conn.closeEvent.wait()
trace "connection cleanup event wait ended"
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t.connections.keepItIf(it != conn)
proc connHandler*(t: TcpTransport,
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server: StreamServer,
client: StreamTransport,
initiator: bool): Connection =
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:
if not isNil(t.handler):
t.handlers &= t.handler(conn)
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t.connections.add(conn)
t.cleanups &= t.cleanup(conn)
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result = conn
proc connCb(server: StreamServer,
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client: StreamTransport) {.async, gcsafe.} =
trace "incomming connection for", address = $client.remoteAddress
let t = cast[TcpTransport](server.udata)
# we don't need result connection in this case
# as it's added inside connHandler
discard t.connHandler(server, client, false)
method init*(t: TcpTransport) =
t.multicodec = multiCodec("tcp")
inc getTcpTransportTracker().opened
method close*(t: TcpTransport) {.async, gcsafe.} =
## start the transport
trace "stopping transport"
await procCall Transport(t).close() # call base
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# server can be nil
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if not isNil(t.server):
t.server.stop()
await t.server.closeWait()
t.server = nil
for fut in t.handlers:
if not fut.finished:
fut.cancel()
t.handlers = await allFinished(t.handlers)
checkFutures(t.handlers)
t.handlers = @[]
for fut in t.cleanups:
if not fut.finished:
fut.cancel()
t.cleanups = await allFinished(t.cleanups)
checkFutures(t.cleanups)
t.cleanups = @[]
trace "transport stopped"
inc getTcpTransportTracker().closed
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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
t.server = createStreamServer(t.ma, connCb, {ReuseAddr}, 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
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)
result = 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