nim-libp2p/tests/testswitch.nim

import unittest, tables, options
import chronos, chronicles
import ../libp2p/[switch, 
                  multistream,
                  protocols/identify, 
                  connection,
                  transports/transport,
                  transports/tcptransport,
                  multiaddress, 
                  peerinfo,
                  crypto/crypto, 
                  peer,
                  protocols/protocol, 
                  muxers/muxer,
                  muxers/mplex/mplex, 
                  muxers/mplex/types,
                  protocols/secure/secio,
                  protocols/secure/secure]

const TestCodec = "/test/proto/1.0.0"

type
  TestProto = ref object of LPProtocol

method init(p: TestProto) {.gcsafe.} =
  proc handle(conn: Connection, proto: string) {.async, gcsafe.} = 
    let msg = cast[string](await conn.readLp())
    check "Hello!" == msg
    await conn.writeLp("Hello!")
    await conn.close()

  p.codec = TestCodec
  p.handler = handle

suite "Switch":
  test "e2e use switch": 
    proc createSwitch(ma: MultiAddress): (Switch, PeerInfo) =
      let seckey = PrivateKey.random(RSA)
      var peerInfo: PeerInfo
      peerInfo.peerId = some(PeerID.init(seckey))
      peerInfo.addrs.add(ma)
      let identify = newIdentify(peerInfo)

      proc createMplex(conn: Connection): Muxer =
        result = newMplex(conn)

      let mplexProvider = newMuxerProvider(createMplex, MplexCodec)
      let transports = @[Transport(newTransport(TcpTransport))]
      let muxers = [(MplexCodec, mplexProvider)].toTable()
      let secureManagers = [(SecioCodec, Secure(newSecio(seckey)))].toTable()
      let switch = newSwitch(peerInfo, transports, identify, muxers, secureManagers)
      result = (switch, peerInfo)

    proc testSwitch(): Future[bool] {.async, gcsafe.} =
      let ma1: MultiAddress = Multiaddress.init("/ip4/0.0.0.0/tcp/0")
      let ma2: MultiAddress = Multiaddress.init("/ip4/0.0.0.0/tcp/0")
      
      var peerInfo1, peerInfo2: PeerInfo
      var switch1, switch2: Switch
      (switch1, peerInfo1) = createSwitch(ma1)

      let testProto = new TestProto
      testProto.init()
      testProto.codec = TestCodec
      switch1.mount(testProto)
      var switch1Fut = await switch1.start()

      (switch2, peerInfo2) = createSwitch(ma2)
      var switch2Fut = await switch2.start()
      let conn = await switch2.dial(switch1.peerInfo, TestCodec)
      await conn.writeLp("Hello!")
      let msg = cast[string](await conn.readLp())
      check "Hello!" == msg

      discard allFutures(switch1.stop(), switch2.stop())
      result = true

    check:
      waitFor(testSwitch()) == true