add multiple read/write streams test

tests/testmplex.nim

@@ -1,4 +1,4 @@
-import unittest, sequtils, sugar, strformat
+import unittest, sequtils, sugar, strformat, options
 import chronos, nimcrypto/utils
 import ../libp2p/connection, 
        ../libp2p/stream/lpstream, 
@@ -10,7 +10,8 @@ import ../libp2p/connection,
        ../libp2p/muxers/mplex/mplex, 
        ../libp2p/muxers/mplex/coder, 
        ../libp2p/muxers/mplex/types,
-       ../libp2p/muxers/mplex/channel
+       ../libp2p/muxers/mplex/channel,
+       ../libp2p/helpers/debug
 
 suite "Mplex":
   test "encode header with channel id 0":
@@ -74,11 +75,12 @@ suite "Mplex":
       let stream = newBufferStream(encHandler)
       let conn = newConnection(stream)
       await stream.pushTo(fromHex("000873747265616d2031"))
-      let (id, msgType, data) = await conn.readMsg()
+      let msg = await conn.readMsg()
 
-      check id == 0
-      check msgType == MessageType.New
-      result = true
+      if msg.isSome:
+        check msg.get().id == 0
+        check msg.get().msgType == MessageType.New
+        result = true
 
     check:
       waitFor(testDecodeHeader()) == true
@@ -89,12 +91,13 @@ suite "Mplex":
       let stream = newBufferStream(encHandler)
       let conn = newConnection(stream)
       await stream.pushTo(fromHex("021668656C6C6F2066726F6D206368616E6E656C20302121"))
-      let (id, msgType, data) = await conn.readMsg()
+      let msg = await conn.readMsg()
 
-      check id == 0
-      check msgType == MessageType.MsgOut
-      check cast[string](data) == "hello from channel 0!!"
-      result = true
+      if msg.isSome:
+        check msg.get().id == 0
+        check msg.get().msgType == MessageType.MsgOut
+        check cast[string](msg.get().data) == "hello from channel 0!!"
+        result = true
 
     check:
       waitFor(testDecodeHeader()) == true
@@ -105,12 +108,13 @@ suite "Mplex":
       let stream = newBufferStream(encHandler)
       let conn = newConnection(stream)
       await stream.pushTo(fromHex("8a011668656C6C6F2066726F6D206368616E6E656C20302121"))
-      let (id, msgType, data) = await conn.readMsg()
+      let msg = await conn.readMsg()
 
-      check id == 17
-      check msgType == MessageType.MsgOut
-      check cast[string](data) == "hello from channel 0!!"
-      result = true
+      if msg.isSome:
+        check msg.get().id == 17
+        check msg.get().msgType == MessageType.MsgOut
+        check cast[string](msg.get().data) == "hello from channel 0!!"
+        result = true
 
     check:
       waitFor(testDecodeHeader()) == true
@@ -209,6 +213,51 @@ suite "Mplex":
     check:
       waitFor(testNewStream()) == true
 
+  test "e2e - multiple read/write streams":
+    proc testNewStream(): Future[bool] {.async.} =
+      let ma: MultiAddress = Multiaddress.init("/ip4/127.0.0.1/tcp/53383")
+
+      var count = 1
+      var listenFut: Future[void]
+      proc connHandler(conn: Connection) {.async, gcsafe.} =
+        proc handleMplexListen(stream: Connection) {.async, gcsafe.} = 
+          let msg = await stream.readLp()
+          check cast[string](msg) == &"stream {count} from dialer!"
+          await stream.writeLp(&"stream {count} from listener!")
+          count.inc
+          await stream.close()
+
+        let mplexListen = newMplex(conn)
+        mplexListen.streamHandler = handleMplexListen
+        listenFut = mplexListen.handle()
+        listenFut.addCallback(proc(udata: pointer) {.gcsafe.}
+                                = debug "completed listener")
+
+      let transport1: TcpTransport = newTransport(TcpTransport)
+      await transport1.listen(ma, connHandler)
+
+      let transport2: TcpTransport = newTransport(TcpTransport)
+      let conn = await transport2.dial(ma)
+
+      let mplexDial = newMplex(conn)
+      let dialFut = mplexDial.handle()
+      dialFut.addCallback(proc(udata: pointer = nil) {.gcsafe.} 
+                            = debug "completed dialer")
+      for i in 1..10:
+        let stream  = await mplexDial.newStream("dialer stream")
+        await stream.writeLp(&"stream {i} from dialer!")
+        let msg = await stream.readLp()
+        check cast[string](msg) == &"stream {i} from listener!"
+        await stream.close()
+
+      await conn.close()
+      listenFut.complete()
+      dialFut.complete()
+      result = true
+
+    check:
+      waitFor(testNewStream()) == true
+
   test "half closed - channel should close for write":
     proc testClosedForWrite(): Future[void] {.async.} =
       proc writeHandler(data: seq[byte]) {.async, gcsafe.} = discard