Add Autonat timeout (#829)

Co-authored-by: Ludovic Chenut <ludovic@status.im>

libp2p/protocols/connectivity/autonat.nim

@@ -46,21 +46,21 @@ type
     InternalError = 300
 
   AutonatPeerInfo* = object
-    id: Option[PeerId]
-    addrs: seq[MultiAddress]
+    id*: Option[PeerId]
+    addrs*: seq[MultiAddress]
 
   AutonatDial* = object
-    peerInfo: Option[AutonatPeerInfo]
+    peerInfo*: Option[AutonatPeerInfo]
 
   AutonatDialResponse* = object
     status*: ResponseStatus
     text*: Option[string]
     ma*: Option[MultiAddress]
 
-  AutonatMsg = object
-    msgType: MsgType
-    dial: Option[AutonatDial]
-    response: Option[AutonatDialResponse]
+  AutonatMsg* = object
+    msgType*: MsgType
+    dial*: Option[AutonatDial]
+    response*: Option[AutonatDialResponse]
 
 proc encode*(msg: AutonatMsg): ProtoBuffer =
   result = initProtoBuffer()
@@ -120,7 +120,7 @@ proc encode*(r: AutonatDialResponse): ProtoBuffer =
   result.write(3, bufferResponse.buffer)
   result.finish()
 
-proc decode(_: typedesc[AutonatMsg], buf: seq[byte]): Option[AutonatMsg] =
+proc decode*(_: typedesc[AutonatMsg], buf: seq[byte]): Option[AutonatMsg] =
   var
     msgTypeOrd: uint32
     pbDial: ProtoBuffer
@@ -203,6 +203,7 @@ type
   Autonat* = ref object of LPProtocol
     sem: AsyncSemaphore
     switch*: Switch
+    dialTimeout: Duration
 
 method dialMe*(a: Autonat, pid: PeerId, addrs: seq[MultiAddress] = newSeq[MultiAddress]()):
     Future[MultiAddress] {.base, async.} =
@@ -240,7 +241,7 @@ method dialMe*(a: Autonat, pid: PeerId, addrs: seq[MultiAddress] = newSeq[MultiA
 proc tryDial(a: Autonat, conn: Connection, addrs: seq[MultiAddress]) {.async.} =
   try:
     await a.sem.acquire()
-    let ma = await a.switch.dialer.tryDial(conn.peerId, addrs)
+    let ma = await a.switch.dialer.tryDial(conn.peerId, addrs).wait(a.dialTimeout)
     if ma.isSome:
       await conn.sendResponseOk(ma.get())
     else:
@@ -298,8 +299,8 @@ proc handleDial(a: Autonat, conn: Connection, msg: AutonatMsg): Future[void] =
     return conn.sendResponseError(DialRefused, "No dialable address")
   return a.tryDial(conn, toSeq(addrs))
 
-proc new*(T: typedesc[Autonat], switch: Switch, semSize: int = 1): T =
-  let autonat = T(switch: switch, sem: newAsyncSemaphore(semSize))
+proc new*(T: typedesc[Autonat], switch: Switch, semSize: int = 1, dialTimeout = 15.seconds): T =
+  let autonat = T(switch: switch, sem: newAsyncSemaphore(semSize), dialTimeout: dialTimeout)
   autonat.init()
   autonat
 

libp2p/services/autonatservice.nim

@@ -52,7 +52,7 @@ proc new*(
   numPeersToAsk: int = 5,
   maxQueueSize: int = 10,
   minConfidence: float = 0.3,
-  dialTimeout = 5.seconds): T =
+  dialTimeout = 30.seconds): T =
   return T(
     scheduleInterval: scheduleInterval,
     networkReachability: Unknown,

tests/testautonat.nim

@@ -2,6 +2,8 @@ import std/options
 import chronos
 import
   ../libp2p/[
+    transports/tcptransport,
+    upgrademngrs/upgrade,
     builders,
     protocols/connectivity/autonat
   ],
@@ -58,3 +60,30 @@ suite "Autonat":
     expect AutonatUnreachableError:
       discard await Autonat.new(src).dialMe(dst.peerInfo.peerId, dst.peerInfo.addrs)
     await allFutures(src.stop(), dst.stop())
+
+  asyncTest "Timeout is triggered in autonat handle":
+    let
+      src = newStandardSwitch()
+      dst = newStandardSwitch()
+      autonat = Autonat.new(dst, dialTimeout = 1.seconds)
+      doesNothingListener = TcpTransport.new(upgrade = Upgrade())
+
+    dst.mount(autonat)
+    await src.start()
+    await dst.start()
+    await doesNothingListener.start(@[MultiAddress.init("/ip4/0.0.0.0/tcp/0").tryGet()])
+
+    await src.connect(dst.peerInfo.peerId, dst.peerInfo.addrs)
+    let conn = await src.dial(dst.peerInfo.peerId, @[AutonatCodec])
+    let buffer = AutonatDial(peerInfo: some(AutonatPeerInfo(
+                         id: some(src.peerInfo.peerId),
+                         # we ask to be dialed in the does nothing listener instead
+                         addrs: doesNothingListener.addrs
+                       ))).encode().buffer
+    await conn.writeLp(buffer)
+    let response = AutonatMsg.decode(await conn.readLp(1024)).get().response.get()
+    check:
+      response.status == DialError
+      response.text.get() == "Timeout exceeded!"
+      response.ma.isNone()
+    await allFutures(doesNothingListener.stop(), src.stop(), dst.stop())