From df8be6eb0942ba96f976cd07045a62668e566324 Mon Sep 17 00:00:00 2001
From: Jonathan de Jong <jonathandejong02@gmail.com>
Date: Thu, 19 Dec 2019 21:09:11 +0100
Subject: [PATCH] revert network/tcp.py and add changes to
 multiaddr_to_socket_fix

---
 libp2p/transport/tcp/tcp.py | 73 +++++--------------------------------
 1 file changed, 9 insertions(+), 64 deletions(-)

diff --git a/libp2p/transport/tcp/tcp.py b/libp2p/transport/tcp/tcp.py
index 310ab79..28ff053 100644
--- a/libp2p/transport/tcp/tcp.py
+++ b/libp2p/transport/tcp/tcp.py
@@ -1,11 +1,9 @@
 import asyncio
-import socket
+from socket import socket
 import sys
-from typing import List, Optional
+from typing import List
 
 from multiaddr import Multiaddr
-from multiaddr.protocols import P_IP4, P_IP6, P_TCP, P_UDP
-from multiaddr.protocols import protocol_with_code as p_code
 
 from libp2p.network.connection.raw_connection import RawConnection
 from libp2p.network.connection.raw_connection_interface import IRawConnection
@@ -31,14 +29,10 @@ class TCPListener(IListener):
         :param maddr: maddr of peer
         :return: return True if successful
         """
-        listen_addr = _ip4_or_6_from_multiaddr(maddr)
-        if listen_addr is None:
-            raise NotImplementedError(
-                "Can only start TCP Listener with a IPv4 or IPv6 address"
-            )
-
         self.server = await asyncio.start_server(
-            self.handler, listen_addr, maddr.value_for_protocol("tcp")
+            self.handler,
+            maddr.value_for_protocol("ip4"),
+            maddr.value_for_protocol("tcp"),
         )
         socket = self.server.sockets[0]
         self.multiaddrs.append(_multiaddr_from_socket(socket))
@@ -76,10 +70,7 @@ class TCP(ITransport):
         :return: `RawConnection` if successful
         :raise OpenConnectionError: raised when failed to open connection
         """
-        self.host = _ip4_or_6_from_multiaddr(maddr)
-        if self.host is None:
-            raise ValueError("Cannot find ipv4 or ipv6 host in multiaddress")
-
+        self.host = maddr.value_for_protocol("ip4")
         self.port = int(maddr.value_for_protocol("tcp"))
 
         try:
@@ -100,52 +91,6 @@ class TCP(ITransport):
         return TCPListener(handler_function)
 
 
-def _ip4_or_6_from_multiaddr(maddr: Multiaddr) -> Optional[str]:
-    if P_IP4 in maddr.protocols():
-        return maddr.value_for_protocol(P_IP4)
-    elif P_IP6 in maddr.protocols():
-        return maddr.value_for_protocol(P_IP6)
-    else:
-        return None
-
-
-def _multiaddr_from_socket(sock: socket.socket) -> Multiaddr:
-    # Reference: http://man7.org/linux/man-pages/man2/socket.2.html#DESCRIPTION
-    # todo: move this to more generic libp2p.transport helper function
-
-    # Reference: https://stackoverflow.com/questions/5815675/what-is-sock-dgram-and-sock-stream
-    # Selects first protocol in sequence if bitwise AND matches, else None
-    t_proto = next(
-        (
-            v
-            for k, v in {
-                socket.SOCK_STREAM: p_code(P_TCP).name,
-                socket.SOCK_DGRAM: p_code(P_UDP).name,
-            }.items()
-            if k & sock.type != 0
-        ),
-        None,
-    )
-
-    if t_proto is None:
-        raise NotImplementedError(
-            f"Cannot convert socket to multiaddr, socket type is of {sock.type}"
-        )
-
-    # Reference: https://docs.python.org/3/library/socket.html#socket-families
-    if sock.family == socket.AF_INET:
-        # ipv4: (host, port)
-        addr, port = sock.getsockname()
-        ip = p_code(P_IP4).name
-
-    elif sock.family == socket.AF_INET6:
-        # ipv6: (host, port, flowinfo, scopeid)
-        addr, port = sock.getsockname()[:2]
-        ip = p_code(P_IP6).name
-
-    else:
-        raise NotImplementedError(
-            f"Cannot convert socket to multiaddr, socket family is of {sock.family}"
-        )
-
-    return Multiaddr(f"/{ip}/{addr}/{t_proto}/{port}")
+def _multiaddr_from_socket(socket: socket) -> Multiaddr:
+    addr, port = socket.getsockname()[:2]
+    return Multiaddr(f"/ip4/{addr}/tcp/{port}")