nim-libp2p/tests/testswitch.nim

import unittest, tables
import chronos
import chronicles
import nimcrypto/sysrand
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]

when defined(nimHasUsed): {.used.}

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

proc createSwitch(ma: MultiAddress): (Switch, PeerInfo) =
  var peerInfo: PeerInfo = PeerInfo.init(PrivateKey.random(RSA))
  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(peerInfo.privateKey)))].toTable()
  let switch = newSwitch(peerInfo,
                         transports,
                         identify,
                         muxers,
                         secureManagers)
  result = (switch, peerInfo)

suite "Switch":
  test "e2e use switch dial proto string":
    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
      var awaiters: seq[Future[void]]

      (switch1, peerInfo1) = createSwitch(ma1)

      let testProto = new TestProto
      testProto.init()
      testProto.codec = TestCodec
      switch1.mount(testProto)
      (switch2, peerInfo2) = createSwitch(ma2)
      awaiters.add(await switch1.start())
      awaiters.add(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

      await allFutures(switch1.stop(), switch2.stop())
      await allFutures(awaiters)
      result = true

    check:
      waitFor(testSwitch()) == true

  test "e2e use switch no proto string":
    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
      var awaiters: seq[Future[void]]

      (switch1, peerInfo1) = createSwitch(ma1)

      let testProto = new TestProto
      testProto.init()
      testProto.codec = TestCodec
      switch1.mount(testProto)
      (switch2, peerInfo2) = createSwitch(ma2)
      awaiters.add(await switch1.start())
      awaiters.add(await switch2.start())
      await switch2.connect(switch1.peerInfo)
      let conn = await switch2.dial(switch1.peerInfo, TestCodec)
      await conn.writeLp("Hello!")
      let msg = cast[string](await conn.readLp())
      check "Hello!" == msg

      await allFutures(switch1.stop(), switch2.stop())
      await allFutures(awaiters)
      result = true

    check:
      waitFor(testSwitch()) == true

  test "e2e: handle read + secio fragmented":
    proc testListenerDialer(): Future[bool] {.async.} =
      let
        server: MultiAddress = Multiaddress.init("/ip4/0.0.0.0/tcp/0")
        serverInfo = PeerInfo.init(PrivateKey.random(RSA), [server])
        serverNoise = newSecio(serverInfo.privateKey)
        readTask = newFuture[void]()

      var hugePayload = newSeq[byte](0x1200000)
      check randomBytes(hugePayload) == hugePayload.len
      trace "Sending huge payload", size = hugePayload.len

      proc connHandler(conn: Connection) {.async, gcsafe.} =
        let sconn = await serverNoise.secure(conn)
        defer:
          await sconn.close()
        let msg = await sconn.read(0x1200000)
        check msg == hugePayload
        readTask.complete()

      let
        transport1: TcpTransport = newTransport(TcpTransport)
      asyncCheck await transport1.listen(server, connHandler)

      let
        transport2: TcpTransport = newTransport(TcpTransport)
        clientInfo = PeerInfo.init(PrivateKey.random(RSA), [transport1.ma])
        clientNoise = newSecio(clientInfo.privateKey)
        conn = await transport2.dial(transport1.ma)
        sconn = await clientNoise.secure(conn)

      await sconn.write(hugePayload)
      await readTask
      await sconn.close()
      await transport1.close()

      result = true

    check:
      waitFor(testListenerDialer()) == true