nim-libp2p/libp2p/transports/wstransport.nim

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## Nim-LibP2P
## Copyright (c) 2021 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.
{.push raises: [Defect].}
import std/[sequtils]
import chronos, chronicles
import transport,
../errors,
../wire,
../multicodec,
../multistream,
../connmanager,
../multiaddress,
../stream/connection,
../upgrademngrs/upgrade,
websock/websock
logScope:
topics = "libp2p wstransport"
export transport, websock
const
WsTransportTrackerName* = "libp2p.wstransport"
type
WsStream = ref object of Connection
session: WSSession
proc new*(T: type WsStream,
session: WSSession,
dir: Direction,
timeout = 10.minutes,
observedAddr: MultiAddress = MultiAddress()): T =
let stream = T(
session: session,
timeout: timeout,
dir: dir,
observedAddr: observedAddr)
stream.initStream()
return stream
method readOnce*(
s: WsStream,
pbytes: pointer,
nbytes: int): Future[int] {.async.} =
let res = await s.session.recv(pbytes, nbytes)
if res == 0 and s.session.readyState == ReadyState.Closed:
raise newLPStreamEOFError()
return res
method write*(
s: WsStream,
msg: seq[byte]): Future[void] {.async.} =
try:
await s.session.send(msg, Opcode.Binary)
except WSClosedError:
raise newLPStreamEOFError()
method closeImpl*(s: WsStream): Future[void] {.async.} =
await s.session.close()
await procCall Connection(s).closeImpl()
type
WsTransport* = ref object of Transport
httpserver: HttpServer
wsserver: WSServer
connections: array[Direction, seq[WsStream]]
tlsPrivateKey: TLSPrivateKey
tlsCertificate: TLSCertificate
tlsFlags: set[TLSFlags]
flags: set[ServerFlags]
factories: seq[ExtFactory]
rng: Rng
proc secure*(self: WsTransport): bool =
not (isNil(self.tlsPrivateKey) or isNil(self.tlsCertificate))
method start*(
self: WsTransport,
ma: MultiAddress) {.async.} =
## listen on the transport
##
if self.running:
trace "WS transport already running"
return
await procCall Transport(self).start(ma)
trace "Starting WS transport"
self.httpserver =
if self.secure:
TlsHttpServer.create(
address = self.ma.initTAddress().tryGet(),
tlsPrivateKey = self.tlsPrivateKey,
tlsCertificate = self.tlsCertificate,
flags = self.flags)
else:
HttpServer.create(self.ma.initTAddress().tryGet())
self.wsserver = WSServer.new(
factories = self.factories,
rng = self.rng)
let codec = if self.secure:
MultiAddress.init("/wss")
else:
MultiAddress.init("/ws")
# always get the resolved address in case we're bound to 0.0.0.0:0
self.ma = MultiAddress.init(
self.httpserver.localAddress()).tryGet() & codec.tryGet()
self.running = true
trace "Listening on", address = self.ma
method stop*(self: WsTransport) {.async, gcsafe.} =
## stop the transport
##
self.running = false # mark stopped as soon as possible
try:
trace "Stopping WS transport"
await procCall Transport(self).stop() # call base
checkFutures(
await allFinished(
self.connections[Direction.In].mapIt(it.close()) &
self.connections[Direction.Out].mapIt(it.close())))
# server can be nil
if not isNil(self.httpserver):
self.httpserver.stop()
await self.httpserver.closeWait()
self.httpserver = nil
trace "Transport stopped"
except CatchableError as exc:
trace "Error shutting down ws transport", exc = exc.msg
proc connHandler(self: WsTransport,
stream: WsSession,
dir: Direction): Future[Connection] {.async.} =
let observedAddr =
try:
let
codec =
if self.secure:
MultiAddress.init("/wss")
else:
MultiAddress.init("/ws")
remoteAddr = stream.stream.reader.tsource.remoteAddress
MultiAddress.init(remoteAddr).tryGet() & codec.tryGet()
except CatchableError as exc:
trace "Failed to create observedAddr", exc = exc.msg
if not(isNil(stream) and stream.stream.reader.closed):
await stream.close()
raise exc
let conn = WsStream.new(stream, dir)
conn.observedAddr = observedAddr
self.connections[dir].add(conn)
proc onClose() {.async.} =
await conn.session.stream.reader.join()
self.connections[dir].keepItIf(it != conn)
trace "Cleaned up client"
asyncSpawn onClose()
return conn
method accept*(self: WsTransport): Future[Connection] {.async, gcsafe.} =
## accept a new WS connection
##
if not self.running:
raise newTransportClosedError()
try:
let
req = await self.httpserver.accept()
wstransp = await self.wsserver.handleRequest(req)
return await self.connHandler(wstransp, Direction.In)
except TransportOsError as exc:
debug "OS Error", exc = exc.msg
except TransportTooManyError as exc:
debug "Too many files opened", exc = exc.msg
except TransportUseClosedError as exc:
debug "Server was closed", exc = exc.msg
raise newTransportClosedError(exc)
except CatchableError as exc:
warn "Unexpected error accepting connection", exc = exc.msg
raise exc
method dial*(
self: WsTransport,
address: MultiAddress): Future[Connection] {.async, gcsafe.} =
## dial a peer
##
trace "Dialing remote peer", address = $address
let
secure = WSS.match(address)
transp = await WebSocket.connect(
address.initTAddress().tryGet(),
"",
secure = secure,
flags = self.tlsFlags)
return await self.connHandler(transp, Direction.Out)
method handles*(t: WsTransport, address: MultiAddress): bool {.gcsafe.} =
if procCall Transport(t).handles(address):
if address.protocols.isOk:
return WebSockets.match(address)
proc new*(
T: typedesc[WsTransport],
upgrade: Upgrade,
tlsPrivateKey: TLSPrivateKey,
tlsCertificate: TLSCertificate,
tlsFlags: set[TLSFlags] = {},
flags: set[ServerFlags] = {},
factories: openArray[ExtFactory] = [],
rng: Rng = nil): T =
T(
upgrader: upgrade,
tlsPrivateKey: tlsPrivateKey,
tlsCertificate: tlsCertificate,
tlsFlags: tlsFlags,
flags: flags,
factories: @factories,
rng: rng)
proc new*(
T: typedesc[WsTransport],
upgrade: Upgrade,
flags: set[ServerFlags] = {},
factories: openArray[ExtFactory] = [],
rng: Rng = nil): T =
T.new(
upgrade = upgrade,
tlsPrivateKey = nil,
tlsCertificate = nil,
flags = flags,
factories = @factories,
rng = rng)