Utp top level raises & some clean-up (#445)

* Add few missing top level raises Defect in uTP

- Add top level {.push raises: [Defect].}
- remove some local raises, including some unneeded
CatchableErrors.
- Don't export messageHandler (avoiding annoying naming collisions)
- export utp_router as those connection callbacks are in the API

* Add some missing copyright clauses

* Some ident and max line length cleanup

* Rename utp_discv5_protocol.nim to be more consistent

eth/utp/growable_buffer.nim

@@ -1,3 +1,9 @@
+# Copyright (c) 2021 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
 import
   std/[options, math, sugar]
 

eth/utp/ledbat_congestion_control.nim

@@ -1,8 +1,15 @@
+# Copyright (c) 2021 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.push raises: [Defect].}
+
 import
   chronos,
   ./utp_utils
 
-
 const targetDelay = milliseconds(100)
 
 # explanation from reference impl:
@@ -93,6 +100,3 @@ proc applyCongestionControl*(
   newMaxWindowSize = clamp(newMaxWindowSize, minWindowSize, maxSndBufferSize)
 
   (newMaxWindowSize, newSlowStartTreshold, newSlowStart)
-
-
-

eth/utp/utp_discov5_protocol.nim

@@ -1,88 +0,0 @@
-import
-  std/[hashes],
-  chronos, chronicles,
-  ../p2p/discoveryv5/[protocol, node],
-  ./utp_router,
-  ../keys
-
-type UtpDiscv5Protocol* = ref object of TalkProtocol
-  prot: protocol.Protocol
-  router: UtpRouter[Node]
-
-proc hash(x: UtpSocketKey[Node]): Hash =
-  var h = 0
-  h = h !& x.remoteAddress.hash
-  h = h !& x.rcvId.hash
-  !$h
-
-proc initSendCallback(t: protocol.Protocol, subProtocolName: seq[byte]): SendCallback[Node] =
-  return (
-    proc (to: Node, data: seq[byte]): Future[void] = 
-      let fut = newFuture[void]()
-      # TODO In discvoveryv5 each talkreq wait for talkresp, but here we would really
-      # like the fire and forget semantics (similar to udp).
-      # For now start talkreq/response in background, and discard its result.
-      # That way we also lose information about any possible errors.
-      # Cosider adding talkreq proc which does not wait for response,
-      discard t.talkreq(to, subProtocolName, data)
-      fut.complete()
-      return fut
-  )
-
-proc messageHandler*(protocol: TalkProtocol, request: seq[byte],
-    srcId: NodeId, srcUdpAddress: Address): seq[byte] =
-    let p = UtpDiscv5Protocol(protocol)
-    let maybeSender = p.prot.getNode(srcId)
-
-    if maybeSender.isSome():
-      let sender =  maybeSender.unsafeGet()
-      # processIncomingBytes may respond to remote by using talkreq requests
-      asyncSpawn p.router.processIncomingBytes(request, sender)
-      # We always sending empty response as discv5 spec requires that talkreq always
-      # receive talkresp
-      @[]
-    else:
-      @[]
-    
-proc new*(
-  T: type UtpDiscv5Protocol,
-  p: protocol.Protocol,
-  subProtocolName: seq[byte],
-  acceptConnectionCb: AcceptConnectionCallback[Node], 
-  socketConfig: SocketConfig = SocketConfig.init(),
-  allowConnectionCb: AllowConnectionCallback[Node] = nil,
-  rng = newRng()): UtpDiscv5Protocol {.raises: [Defect, CatchableError].} =
-  doAssert(not(isNil(acceptConnectionCb)))
-
-  let router = UtpRouter[Node].new(
-    acceptConnectionCb,
-    allowConnectionCb,
-    socketConfig,
-    rng
-  )
-  router.sendCb = initSendCallback(p, subProtocolName)
-
-  let prot = UtpDiscv5Protocol(
-    protocolHandler: messageHandler,
-    prot: p,
-    router: router
-  )
-
-  p.registerTalkProtocol(subProtocolName, prot).expect(
-    "Only one protocol should have this id"
-  )
-  prot
-
-proc connectTo*(r: UtpDiscv5Protocol, address: Node): Future[ConnectionResult[Node]]=
-  return r.router.connectTo(address)
-
-proc connectTo*(r: UtpDiscv5Protocol, address: Node, connectionId: uint16): Future[ConnectionResult[Node]]=
-  return r.router.connectTo(address, connectionId)
-
-proc shutdown*(r: UtpDiscv5Protocol) =
-  ## closes all managed utp connections in background (not closed discovery, it is up to user)
-  r.router.shutdown()
-
-proc shutdownWait*(r: UtpDiscv5Protocol) {.async.} =
-  ## closes all managed utp connections in background (not closed discovery, it is up to user)
-  await r.router.shutdownWait()

eth/utp/utp_discv5_protocol.nim

@@ -0,0 +1,103 @@
+# Copyright (c) 2021 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.push raises: [Defect].}
+
+import
+  std/[hashes],
+  chronos, chronicles,
+  ../p2p/discoveryv5/protocol,
+  ./utp_router,
+  ../keys
+
+export utp_router
+
+type UtpDiscv5Protocol* = ref object of TalkProtocol
+  prot: protocol.Protocol
+  router: UtpRouter[Node]
+
+proc hash(x: UtpSocketKey[Node]): Hash =
+  var h = 0
+  h = h !& x.remoteAddress.hash
+  h = h !& x.rcvId.hash
+  !$h
+
+proc initSendCallback(
+    t: protocol.Protocol, subProtocolName: seq[byte]): SendCallback[Node] =
+  return (
+    proc (to: Node, data: seq[byte]): Future[void] = 
+      let fut = newFuture[void]()
+      # TODO: In discovery v5 each talkreq waits for a talkresp, but here we
+      # would really like the fire and forget semantics (similar to udp).
+      # For now start talkreq/talkresp in background, and discard its result.
+      # That way we also lose information about any possible errors.
+      # Consider adding talkreq proc which does not wait for the response.
+      discard t.talkreq(to, subProtocolName, data)
+      fut.complete()
+      return fut
+  )
+
+proc messageHandler(protocol: TalkProtocol, request: seq[byte],
+    srcId: NodeId, srcUdpAddress: Address): seq[byte] =
+  let p = UtpDiscv5Protocol(protocol)
+  let maybeSender = p.prot.getNode(srcId)
+
+  if maybeSender.isSome():
+    let sender =  maybeSender.unsafeGet()
+    # processIncomingBytes may respond to remote by using talkreq requests
+    asyncSpawn p.router.processIncomingBytes(request, sender)
+    # We always send empty responses as discv5 spec requires that talkreq
+    # always receives a talkresp.
+    @[]
+  else:
+    @[]
+    
+proc new*(
+    T: type UtpDiscv5Protocol,
+    p: protocol.Protocol,
+    subProtocolName: seq[byte],
+    acceptConnectionCb: AcceptConnectionCallback[Node],
+    socketConfig: SocketConfig = SocketConfig.init(),
+    allowConnectionCb: AllowConnectionCallback[Node] = nil,
+    rng = newRng()): UtpDiscv5Protocol =
+  doAssert(not(isNil(acceptConnectionCb)))
+
+  let router = UtpRouter[Node].new(
+    acceptConnectionCb,
+    allowConnectionCb,
+    socketConfig,
+    rng
+  )
+  router.sendCb = initSendCallback(p, subProtocolName)
+
+  let prot = UtpDiscv5Protocol(
+    protocolHandler: messageHandler,
+    prot: p,
+    router: router
+  )
+
+  p.registerTalkProtocol(subProtocolName, prot).expect(
+    "Only one protocol should have this id"
+  )
+  prot
+
+proc connectTo*(r: UtpDiscv5Protocol, address: Node):
+    Future[ConnectionResult[Node]] =
+  return r.router.connectTo(address)
+
+proc connectTo*(r: UtpDiscv5Protocol, address: Node, connectionId: uint16):
+    Future[ConnectionResult[Node]] =
+  return r.router.connectTo(address, connectionId)
+
+proc shutdown*(r: UtpDiscv5Protocol) =
+  ## Closes all managed utp connections in background (does not close discovery,
+  ## this is up to user)
+  r.router.shutdown()
+
+proc shutdownWait*(r: UtpDiscv5Protocol) {.async.} =
+  ## Closes all managed utp connections in background (does not close discovery,
+  ## this is up to user)
+  await r.router.shutdownWait()

eth/utp/utp_protocol.nim

@@ -1,4 +1,4 @@
-# Copyright (c) 2020-2021 Status Research & Development GmbH
+# Copyright (c) 2021 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).

eth/utp/utp_router.nim

@@ -1,3 +1,11 @@
+# Copyright (c) 2021 Status Research & Development GmbH
+# Licensed and distributed under either of
+#   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
+#   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
+# at your option. This file may not be copied, modified, or distributed except according to those terms.
+
+{.push raises: [Defect].}
+
 import
   std/[tables, options, sugar],
   chronos, bearssl, chronicles,
@@ -17,15 +25,15 @@ type
   AcceptConnectionCallback*[A] = proc(server: UtpRouter[A],
     client: UtpSocket[A]): Future[void] {.gcsafe, raises: [Defect].}
 
-  # Callback to act as fire wall for incoming peers. Should return true if peer is allowed
-  # to connect.
-  AllowConnectionCallback*[A] =
-    proc(r: UtpRouter[A], remoteAddress: A, connectionId: uint16): bool {.gcsafe, raises: [Defect], noSideEffect.}
+  # Callback to act as firewall for incoming peers. Should return true if peer
+  # is allowed to connect.
+  AllowConnectionCallback*[A] = proc(r: UtpRouter[A], remoteAddress: A,
+    connectionId: uint16): bool {.gcsafe, raises: [Defect], noSideEffect.}
 
-  # Oject responsible for creating and maintaing table of of utp sockets.
-  # caller should use `processIncomingBytes` proc to feed it with incoming byte 
-  # packets, based this input, proper utp sockets will be created, closed, or will
-  # receive data 
+  # Object responsible for creating and maintaining table of utp sockets.
+  # Caller should use `processIncomingBytes` proc to feed it with incoming byte
+  # packets. Based on this input, proper utp sockets will be created, closed,
+  # or will receive data.
   UtpRouter*[A] = ref object
    sockets: Table[UtpSocketKey[A], UtpSocket[A]]
    socketConfig: SocketConfig
@@ -36,13 +44,13 @@ type
    rng*: ref BrHmacDrbgContext
 
 const
-  # Maximal number of tries to genearte unique socket while establishing outgoing
-  # connection.
+  # Maximal number of tries to generate unique socket while establishing
+  # outgoing connection.
   maxSocketGenerationTries = 1000
 
-# this should probably be in standard lib, it allows lazy composition of options i.e
-# one can write: O1 orElse O2 orElse O3, and chain will be evaluated to first option
-# which isSome()
+# This should probably be in standard lib, it allows lazy composition of options
+# i.e one can write: O1 orElse O2 orElse O3, and chain will be evaluated to
+# first option which isSome()
 template orElse[A](a: Option[A], b: Option[A]): Option[A] =
   if (a.isSome()):
     a
@@ -70,13 +78,13 @@ proc len*[A](s: UtpRouter[A]): int =
 proc registerUtpSocket[A](p: UtpRouter, s: UtpSocket[A]) =
   ## Register socket, overwriting already existing one
   p.sockets[s.socketKey] = s
-  # Install deregister handler, so when socket will get closed, in will be promptly
+  # Install deregister handler, so when socket gets closed, in will be promptly
   # removed from open sockets table
   s.registerCloseCallback(proc () = p.deRegisterUtpSocket(s))
 
 proc registerIfAbsent[A](p: UtpRouter, s: UtpSocket[A]): bool =
-  ## Registers socket only if its not already exsiting in the active sockets table
-  ## return true is socket has been succesfuly registered
+  ## Registers socket only if it's not already existing in the active sockets
+  ## table. Returns true if socket has been succesfuly registered.
   if p.sockets.hasKey(s.socketKey):
     false
   else:
@@ -88,7 +96,7 @@ proc new*[A](
     acceptConnectionCb: AcceptConnectionCallback[A],
     allowConnectionCb: AllowConnectionCallback[A],
     socketConfig: SocketConfig = SocketConfig.init(),
-  rng = newRng()): UtpRouter[A] {.raises: [Defect, CatchableError].} =
+    rng = newRng()): UtpRouter[A] =
   doAssert(not(isNil(acceptConnectionCb)))
   UtpRouter[A](
     sockets: initTable[UtpSocketKey[A], UtpSocket[A]](),
@@ -102,7 +110,7 @@ proc new*[A](
     T: type UtpRouter[A],
     acceptConnectionCb: AcceptConnectionCallback[A],
     socketConfig: SocketConfig = SocketConfig.init(),
-  rng = newRng()): UtpRouter[A] {.raises: [Defect, CatchableError].} =
+    rng = newRng()): UtpRouter[A] =
   UtpRouter[A].new(acceptConnectionCb, nil, socketConfig, rng)
 
 # There are different possiblites how connection was established, and we need to 

eth/utp/utp_socket.nim

@@ -1,4 +1,4 @@
-# Copyright (c) 2020-2021 Status Research & Development GmbH
+# Copyright (c) 2021 Status Research & Development GmbH
 # Licensed and distributed under either of
 #   * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).

tests/utp/test_discv5_protocol.nim

@@ -12,8 +12,7 @@ import
   testutils/unittests,
   ../../eth/p2p/discoveryv5/[enr, node, routing_table],
   ../../eth/p2p/discoveryv5/protocol as discv5_protocol,
-  ../../eth/utp/utp_router,
-  ../../eth/utp/utp_discov5_protocol,
+  ../../eth/utp/utp_discv5_protocol,
   ../../eth/keys
 
 proc localAddress*(port: int): Address =