Fix unix path multiaddress serialization/deserialization.

Add tests for unix path multiaddress.
Add wire.nim.
Fix latest breaking changes from go-libp2p-daemon.

libp2p/daemon/daemonapi.nim

@@ -10,15 +10,18 @@
 ## This module implementes API for `go-libp2p-daemon`.
 import os, osproc, strutils, tables, streams, strtabs
 import asyncdispatch2
-import ../varint, ../multiaddress, ../base58, ../cid
+import ../varint, ../multiaddress, ../multicodec, ../base58, ../cid
-import ../protobuf/minprotobuf
+import ../wire, ../protobuf/minprotobuf
 
 when not defined(windows):
   import posix
 
 const
-  DefaultSocketPath* = "/tmp/p2pd.sock"
+  DefaultSocketPath* = "/unix/tmp/p2pd.sock"
-  DefaultSocketPattern* = "/tmp/p2pd-$1.sock"
+  DefaultUnixSocketPattern* = "/unix/tmp/nim-p2pd-$1-$2.sock"
+  DefaultIpSocketPattern* = "/ip4/127.0.0.1/tcp/$2"
+  DefaultUnixChildPattern* = "/unix/tmp/nim-p2pd-handle-$1-$2.sock"
+  DefaultIpChildPattern* = "/ip4/127.0.0.1/tcp/$2"
   DefaultDaemonFile* = "p2pd"
 
 type
@@ -104,13 +107,12 @@ type
 
   P2PServer = object
     server*: StreamServer
-    address*: TransportAddress
+    address*: MultiAddress
 
   DaemonAPI* = ref object
     # pool*: TransportPool
     flags*: set[P2PDaemonFlags]
-    address*: TransportAddress
+    address*: MultiAddress
-    sockname*: string
     pattern*: string
     ucounter*: int
     process*: Process
@@ -197,13 +199,13 @@ proc requestStreamOpen(peerid: PeerID,
   result.write(initProtoField(3, msg))
   result.finish()
 
-proc requestStreamHandler(path: string,
+proc requestStreamHandler(address: MultiAddress,
                           protocols: openarray[MultiProtocol]): ProtoBuffer =
   ## https://github.com/libp2p/go-libp2p-daemon/blob/master/conn.go
   ## Processing function `doStreamHandler(req *pb.Request)`.
   result = initProtoBuffer({WithVarintLength})
   var msg = initProtoBuffer()
-  msg.write(initProtoField(1, path))
+  msg.write(initProtoField(1, address.data.buffer))
   for item in protocols:
     msg.write(initProtoField(2, item))
   result.write(initProtoField(1, cast[uint](RequestType.STREAM_HANDLER)))
@@ -483,19 +485,22 @@ proc recvMessage(conn: StreamTransport): Future[seq[byte]] {.async.} =
   result = buffer
 
 proc newConnection*(api: DaemonAPI): Future[StreamTransport] =
-  # echo "Establish new connection to daemon [", $api.address, "]"
   result = connect(api.address)
 
 proc closeConnection*(api: DaemonAPI, transp: StreamTransport) {.async.} =
-  # echo "Close connection with daemon [", $api.address, "]"
   transp.close()
   await transp.join()
 
-when not defined(windows):
+proc socketExists(address: MultiAddress): Future[bool] {.async.} =
-  proc socketExists(filename: string): bool =
+  try:
-    var res: Stat
+    var transp = await connect(address)
-    result = stat(filename, res) >= 0'i32
+    transp.close()
+    await transp.join()
+    result = true
+  except:
+    result = false
 
+when not defined(windows):
   proc loggingHandler(api: DaemonAPI): Future[void] =
     var retFuture = newFuture[void]("logging.handler")
     var loop = getGlobalDispatcher()
@@ -521,9 +526,8 @@ when not defined(windows):
   proc getProcessId(): int =
     result = posix.getpid()
 else:
-  proc socketExists(filename: string): bool =
+  proc getCurrentProcessId*(): uint32 {.stdcall, dynlib: "kernel32",
-    # Not ready yet
+                                        importc: "GetCurrentProcessId".}
-    false
 
   proc loggingHandler(api: DaemonAPI): Future[void] =
     # Not ready yet.
@@ -531,20 +535,18 @@ else:
 
   proc getProcessId(): int =
     # Not ready yet
-    discard
+    result = cast[int](getCurrentProcessId())
 
-proc getSocketName(pattern: string): string =
+proc getSocket(pattern: string): Future[MultiAddress] {.async.} =
   var sockname = ""
   var pid = $getProcessId()
   while true:
     inc(daemonsCount)
     sockname = pattern % [pid, $daemonsCount]
-    if socketExists(sockname):
+    var ma = MultiAddress.init(sockname)
-      if tryRemoveFile(sockname):
+    let res = await socketExists(ma)
-        result = sockname
+    if not res:
-        break
+      result = ma
-    else:
-      result = sockname
       break
 
 # This is forward declaration needed for newDaemonApi()
@@ -554,14 +556,46 @@ proc newDaemonApi*(flags: set[P2PDaemonFlags] = {},
                    bootstrapNodes: seq[string] = @[],
                    id: string = "",
                    daemon = DefaultDaemonFile,
-                   sockpath = DefaultSocketPath,
+                   sockpath = "",
-                   patternSock = "/tmp/nim-p2pd-$1-$2.sock",
+                   patternSock = DefaultUnixSocketPattern,
-                   patternHandler = "/tmp/nim-p2pd-handle-$1-$2.sock",
+                   patternHandler = DefaultUnixChildPattern,
                    poolSize = 10,
                    gossipsubHeartbeatInterval = 0,
                    gossipsubHeartbeatDelay = 0,
                    peersRequired = 2): Future[DaemonAPI] {.async.} =
   ## Initialize connection to `go-libp2p-daemon` control socket.
+  ##
+  ## ``flags`` - set of P2PDaemonFlags.
+  ##
+  ## ``bootstrapNodes`` - list of bootnode's addresses in MultiAddress format.
+  ## (default: @[], which means usage of default nodes inside of
+  ## `go-libp2p-daemon`).
+  ##
+  ## ``id`` - path to file with identification information (default: "" which
+  ## means - generate new random identity).
+  ##
+  ## ``daemon`` - name of ``go-libp2p-daemon`` executable (default: "p2pd").
+  ##
+  ## ``sockpath`` - default control socket MultiAddress
+  ## (default: "/unix/tmp/p2pd.sock").
+  ##
+  ## ``patternSock`` - MultiAddress pattern string, used to start multiple
+  ## daemons (default: "/unix/tmp/nim-p2pd-$1-$2.sock").
+  ##
+  ## ``patternHandler`` - MultiAddress pattern string, used to establish
+  ## incoming channels (default: "/unix/tmp/nim-p2pd-handle-$1-$2.sock").
+  ##
+  ## ``poolSize`` - size of connections pool (default: 10).
+  ##
+  ## ``gossipsubHeartbeatInterval`` - GossipSub protocol heartbeat interval in
+  ## milliseconds (default: 0, use default `go-libp2p-daemon` values).
+  ##
+  ## ``gossipsubHeartbeatDelay`` - GossipSub protocol heartbeat delay in
+  ## millseconds (default: 0, use default `go-libp2p-daemon` values).
+  ##
+  ## ``peersRequired`` - Wait until `go-libp2p-daemon` will connect to at least
+  ## ``peersRequired`` peers before return from `newDaemonApi()` procedure
+  ## (default: 2).
   var api = new DaemonAPI
   var args = newSeq[string]()
   var env: StringTableRef
@@ -571,15 +605,15 @@ proc newDaemonApi*(flags: set[P2PDaemonFlags] = {},
   api.pattern = patternHandler
   api.ucounter = 1
   api.handlers = initTable[string, P2PStreamCallback]()
-  api.sockname = sockpath
 
-  if api.sockname == DefaultSocketPath:
+  if len(sockpath) == 0:
-    api.sockname = getSocketName(patternSock)
+    api.address = await getSocket(patternSock)
   else:
-    if not socketExists(api.sockname):
+    api.address = MultiAddress.init(sockpath)
-      raise newException(DaemonLocalError, "Unix socket is not found!")
+    let res = await socketExists(api.address)
+    if not res:
+      raise newException(DaemonLocalError, "Could not connect to remote daemon")
 
-  api.address = initTAddress(api.sockname)
   inc(daemonsCount)
 
   # DHTFull and DHTClient could not be present at the same time
@@ -619,8 +653,7 @@ proc newDaemonApi*(flags: set[P2PDaemonFlags] = {},
     args.add("-bootstrapPeers=" & bootstrapNodes.join(","))
   if len(id) != 0:
     args.add("-id=" & id)
-  if api.sockname != DefaultSocketPath:
+  args.add("-listen=" & $api.address)
-    args.add("-sock=" & api.sockname)
 
   # We are trying to get absolute daemon path.
   let cmd = findExe(daemon)
@@ -628,6 +661,7 @@ proc newDaemonApi*(flags: set[P2PDaemonFlags] = {},
     raise newException(DaemonLocalError, "Could not find daemon executable!")
 
   # Starting daemon process
+  # echo "Starting ", cmd, " ", args.join(" ")
   api.process = startProcess(cmd, "", args, env, {poStdErrToStdOut})
   # Waiting until daemon will not be bound to control socket.
   while true:
@@ -635,10 +669,11 @@ proc newDaemonApi*(flags: set[P2PDaemonFlags] = {},
       echo api.process.errorStream.readAll()
       raise newException(DaemonLocalError,
                          "Daemon executable could not be started!")
-    if socketExists(api.sockname):
+    let res = await socketExists(api.address)
+    if res:
       break
-    await sleepAsync(100)
+    await sleepAsync(500)
-  # api.pool = await newPool(api.address, poolsize = poolSize)
+
   if Logging in api.flags:
     api.loggerFut = loggingHandler(api)
 
@@ -673,7 +708,8 @@ proc close*(api: DaemonAPI) {.async.} =
       pending.add(server.server.join())
     await all(pending)
     for server in api.servers:
-      discard tryRemoveFile($(server.address))
+      let address = initTAddress(server.address)
+      discard tryRemoveFile($address)
     api.servers.setLen(0)
   # Closing daemon's process.
   api.process.kill()
@@ -681,9 +717,10 @@ proc close*(api: DaemonAPI) {.async.} =
   # Waiting for logger loop to exit
   if not isNil(api.loggerFut):
     await api.loggerFut
-  # Attempt to delete control socket endpoint.
+  # Attempt to delete unix socket endpoint.
-  if socketExists(api.sockname):
+  let address = initTAddress(api.address)
-    discard tryRemoveFile(api.sockname)
+  if address.family == AddressFamily.Unix:
+    discard tryRemoveFile($address)
 
 template withMessage(m, body: untyped): untyped =
   let kind = m.checkResponse()
@@ -809,18 +846,18 @@ proc addHandler*(api: DaemonAPI, protocols: seq[string],
                  handler: P2PStreamCallback) {.async.} =
   ## Add stream handler ``handler`` for set of protocols ``protocols``.
   var transp = await api.newConnection()
-  var sockname = api.pattern % [$getProcessId(), $api.ucounter]
+  let addrname = api.pattern % [$getProcessId(), $api.ucounter]
-  var localaddr = initTAddress(sockname)
+  let maddress = MultiAddress.init(addrname)
   inc(api.ucounter)
-  var server = createStreamServer(localaddr, streamHandler, udata = api)
+  var server = createStreamServer(maddress, streamHandler, udata = api)
   try:
     for item in protocols:
       api.handlers[item] = handler
     server.start()
-    var pb = await transp.transactMessage(requestStreamHandler(sockname,
+    var pb = await transp.transactMessage(requestStreamHandler(maddress,
                                                                protocols))
     pb.withMessage() do:
-      api.servers.add(P2PServer(server: server, address: localaddr))
+      api.servers.add(P2PServer(server: server, address: maddress))
   except:
     for item in protocols:
       api.handlers.del(item)

libp2p/multiaddress.nim

@@ -421,9 +421,9 @@ proc protoArgument*(ma: MultiAddress, value: var openarray[byte]): int =
   elif proto.kind in {Length, Path}:
     if vb.data.readSeq(buffer) == -1:
       raise newException(MultiAddressError, "Decoding protocol error")
-    result = len(vb.data.buffer)
+    result = len(buffer)
     if len(value) >= result:
-      copyMem(addr value[0], addr vb.data.buffer[0], result)
+      copyMem(addr value[0], addr buffer[0], result)
 
 proc getPart(ma: MultiAddress, index: int): MultiAddress =
   var header: uint64
@@ -517,6 +517,9 @@ proc `$`*(value: MultiAddress): string =
       if not proto.coder.bufferToString(vb.data, part):
         raise newException(MultiAddressError, "Decoding protocol error")
       parts.add($(proto.mcodec))
+      if proto.kind == Path and part[0] == '/':
+        parts.add(part[1..^1])
+      else:
         parts.add(part)
     elif proto.kind == Marker:
       parts.add($(proto.mcodec))

libp2p/wire.nim

@@ -0,0 +1,82 @@
+## Nim-Libp2p
+## Copyright (c) 2018 Status Research & Development GmbH
+## Licensed under either of
+##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
+##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
+## at your option.
+## This file may not be copied, modified, or distributed except according to
+## those terms.
+
+## This module implements wire network connection procedures.
+import asyncdispatch2
+import multiaddress, multicodec
+
+proc initTAddress*(ma: MultiAddress): TransportAddress =
+  ## Initialize ``TransportAddress`` with MultiAddress ``ma``.
+  ##
+  ## MultiAddress must be wire address, e.g. ``{IP4, IP6, UNIX}/{TCP, UDP}``.
+  var state = 0
+  var pbuf: array[2, byte]
+  for part in ma.items():
+    let code = part.protoCode()
+    if state == 0:
+      if code == multiCodec("ip4"):
+        result = TransportAddress(family: AddressFamily.IPv4)
+        if ma.protoArgument(result.address_v4) == 0:
+          raise newException(TransportAddressError, "Incorrect IPv4 address")
+        inc(state)
+      elif code == multiCodec("ip6"):
+        result = TransportAddress(family: AddressFamily.IPv6)
+        if ma.protoArgument(result.address_v6) == 0:
+          raise newException(TransportAddressError, "Incorrect IPv6 address")
+        inc(state)
+      elif code == multiCodec("unix"):
+        result = TransportAddress(family: AddressFamily.Unix)
+        if ma.protoArgument(result.address_un) == 0:
+          raise newException(TransportAddressError, "Incorrect Unix address")
+        result.port = Port(1)
+        break
+      else:
+        raise newException(TransportAddressError,
+                           "Could not initialize address!")
+    elif state == 1:
+      if code == multiCodec("tcp") or code == multiCodec("udp"):
+        if ma.protoArgument(pbuf) == 0:
+          raise newException(TransportAddressError, "Incorrect port")
+        result.port = Port((cast[uint16](pbuf[0]) shl 8) or
+                            cast[uint16](pbuf[1]))
+        break
+      else:
+        raise newException(TransportAddressError,
+                           "Could not initialize address!")
+
+proc connect*(ma: MultiAddress, bufferSize = DefaultStreamBufferSize,
+              child: StreamTransport = nil): Future[StreamTransport] =
+  ## Open new connection to remote peer with address ``ma`` and create
+  ## new transport object ``StreamTransport`` for established connection.
+  ## ``bufferSize`` is size of internal buffer for transport.
+  let address = initTAddress(ma)
+  if address.family in {AddressFamily.IPv4, AddressFamily.IPv6}:
+    if ma[1].protoCode() != multiCodec("tcp"):
+      var retFuture = newFuture[StreamTransport]()
+      retFuture.fail(newException(TransportAddressError,
+                                  "Incorrect address type!"))
+      return retFuture
+  result = connect(address, bufferSize, child)
+
+proc createStreamServer*[T](ma: MultiAddress,
+                            cbproc: StreamCallback,
+                            flags: set[ServerFlags] = {},
+                            udata: ref T,
+                            sock: AsyncFD = asyncInvalidSocket,
+                            backlog: int = 100,
+                            bufferSize: int = DefaultStreamBufferSize,
+                            child: StreamServer = nil,
+                            init: TransportInitCallback = nil): StreamServer =
+  ## Create new TCP stream server which bounds to ``ma`` address.
+  var address = initTAddress(ma)
+  if address.family in {AddressFamily.IPv4, AddressFamily.IPv6}:
+    if ma[1].protoCode() != multiCodec("tcp"):
+      raise newException(TransportAddressError, "Incorrect address type!")
+  result = createStreamServer(address, cbproc, flags, udata, sock, backlog,
+                              bufferSize, child, init)

tests/testmultiaddress.nim

@@ -170,6 +170,16 @@ const
     "/p2p-circuit/50"
   ]
 
+  PathVectors = [
+    "/unix/tmp/p2pd.sock",
+    "/unix/a/b/c/d/e/f/g/h/i.sock"
+  ]
+
+  PathExpects = [
+    "90030E2F746D702F703270642E736F636B",
+    "9003172F612F622F632F642F652F662F672F682F692E736F636B"
+  ]
+
   UtilitySuccessVectors = [
     "/ip4/127.0.0.1/tcp/1024",
     "/ip4/127.0.0.1/udp/1024",
@@ -247,3 +257,10 @@ suite "MultiAddress test suite":
     for item in UtilityFailVectors:
       var a = MultiAddress.init(item)
       check a.isWire() == false
+
+  test "Path addresses serialization/deserialization":
+    for i in 0..<len(PathVectors):
+      var a = MultiAddress.init(PathVectors[i])
+      check:
+        hex(a) == PathExpects[i]
+        $a == PathVectors[i]