test multiple streams with mplex

libp2p/stream/bufferstream.nim

@@ -35,25 +35,26 @@ import chronos
 import ../stream/lpstream
 
 type
-  WriteHandler* = proc (data: seq[byte]): Future[void] {.gcsafe.} # TODO: figure out how to make this generic to avoid casts
+  # TODO: figure out how to make this generic to avoid casts
+  WriteHandler* = proc (data: seq[byte]): Future[void] {.gcsafe.}
 
   BufferStream* = ref object of LPStream
     maxSize*: int # buffer's max size in bytes
     readBuf: Deque[byte] # a deque is based on a ring buffer
-    readReqs: Deque[Future[int]] # use dequeue to fire reads in order
+    readReqs: Deque[Future[void]] # use dequeue to fire reads in order
     dataReadEvent: AsyncEvent
     writeHandler*: WriteHandler
 
-proc requestReadBytes(s: BufferStream): Future[int] = 
+proc requestReadBytes(s: BufferStream): Future[void] = 
   ## create a future that will complete when more 
   ## data becomes available in the read buffer
-  result = newFuture[int]()
+  result = newFuture[void]()
   s.readReqs.addLast(result)
 
 proc initBufferStream*(s: BufferStream, handler: WriteHandler, size: int = 1024) = 
   s.maxSize = if isPowerOfTwo(size): size else: nextPowerOfTwo(size)
   s.readBuf = initDeque[byte](s.maxSize)
-  s.readReqs = initDeque[Future[int]]()
+  s.readReqs = initDeque[Future[void]]()
   s.dataReadEvent = newAsyncEvent()
   s.writeHandler = handler
 
@@ -90,7 +91,7 @@ proc pushTo*(s: BufferStream, data: seq[byte]) {.async, gcsafe.} =
 
     # resolve the next queued read request
     if s.readReqs.len > 0:
-      s.readReqs.popFirst().complete(index + 1)
+      s.readReqs.popFirst().complete()
     
     if index >= data.len:
       break
@@ -111,7 +112,7 @@ method read*(s: BufferStream, n = -1): Future[seq[byte]] {.async, gcsafe.} =
       inc(index)
 
     if index < size:
-      discard await s.requestReadBytes()
+      await s.requestReadBytes()
 
 method readExactly*(s: BufferStream, 
                     pbytes: pointer, 
@@ -174,7 +175,7 @@ method readOnce*(s: BufferStream,
   ## If internal buffer is not empty, ``nbytes`` bytes will be transferred from
   ## internal buffer, otherwise it will wait until some bytes will be received.
   if s.readBuf.len == 0:
-    discard await s.requestReadBytes()
+    await s.requestReadBytes()
   
   var len = if nbytes > s.readBuf.len: s.readBuf.len else: nbytes
   await s.readExactly(pbytes, len)

libp2p/stream/chronosstream.nim

@@ -60,9 +60,10 @@ method close*(s: ChronosStream) {.async, gcsafe.} =
       await s.reader.closeWait()
 
     await s.writer.finish()
-
     if not s.writer.closed:
       await s.writer.closeWait()
 
+    if not s.client.closed:
       await s.client.closeWait()
+    
     s.closed = true

tests/testmplex.nim

@@ -1,4 +1,4 @@
-import unittest, sequtils, sugar
+import unittest, sequtils, sugar, strformat
 import chronos, nimcrypto/utils
 import ../libp2p/connection, 
        ../libp2p/stream/lpstream, 
@@ -131,6 +131,49 @@ suite "Mplex":
     check:
       waitFor(testNewStream()) == true
 
+  test "e2e - multiple streams":
+    proc testNewStream(): Future[bool] {.async.} =
+      let ma: MultiAddress = Multiaddress.init("/ip4/127.0.0.1/tcp/53382")
+
+      var count = 0
+      var completionFut: Future[void] = newFuture[void]()
+      proc connHandler(conn: Connection) {.async, gcsafe.} =
+        proc handleMplexListen(stream: Connection) {.async, gcsafe.} = 
+          let msg = await stream.readLp()
+          check cast[string](msg) == &"Hello from stream {count}!"
+          count.inc
+          await stream.close()
+          if count == 11:
+            completionFut.complete()
+
+        let mplexListen = newMplex(conn)
+        mplexListen.streamHandler = handleMplexListen
+        asyncCheck mplexListen.handle()
+
+      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)
+      asyncCheck mplexDial.handle()
+
+      for i in 0..10:
+        let stream  = await mplexDial.newStream()
+        await stream.writeLp(&"Hello from stream {i}!")
+
+      await completionFut
+      # closing the connection doesn't transfer all the data
+      # this seems to be a bug in chronos
+      # await conn.close()
+      check count == 11
+
+      result = true
+
+    check:
+      waitFor(testNewStream()) == true
+
   test "half closed - channel should close for write":
     proc testClosedForWrite(): Future[void] {.async.} =
       let chann = newChannel(1, newConnection(new LPStream), true)