Update tests in test_tcp.py

Besides, run `make format`

libp2p/network/connection/swarm_connection.py

@@ -1,7 +1,7 @@
 from typing import TYPE_CHECKING, Any, Awaitable, List, Set, Tuple
 
-import trio
 from async_service import Service
+import trio
 
 from libp2p.network.connection.net_connection_interface import INetConn
 from libp2p.network.stream.net_stream import NetStream

libp2p/network/swarm.py

@@ -2,7 +2,6 @@ import logging
 from typing import Dict, List, Optional
 
 from async_service import Service
-
 from multiaddr import Multiaddr
 import trio
 
@@ -205,7 +204,7 @@ class Swarm(INetwork, Service):
 
                 logger.debug("successfully opened connection to peer %s", peer_id)
                 # FIXME: This is a intentional barrier to prevent from the handler exiting and
-                #   closing the connection.
+                #   closing the connection. Probably change to `Service.manager.wait_finished`?
                 await trio.sleep_forever()
 
             try:
@@ -229,16 +228,6 @@ class Swarm(INetwork, Service):
     async def close(self) -> None:
         # TODO: Prevent from new listeners and conns being added.
         #   Reference: https://github.com/libp2p/go-libp2p-swarm/blob/8be680aef8dea0a4497283f2f98470c2aeae6b65/swarm.go#L124-L134  # noqa: E501
-
-        # Close listeners
-        # await asyncio.gather(
-        #     *[listener.close() for listener in self.listeners.values()]
-        # )
-
-        # # Close connections
-        # await asyncio.gather(
-        #     *[connection.close() for connection in self.connections.values()]
-        # )
         await self.manager.stop()
         await self.manager.wait_finished()
         logger.debug("swarm successfully closed")

libp2p/stream_muxer/mplex/mplex.py

@@ -1,11 +1,11 @@
-import math
 import asyncio
 import logging
+import math
 from typing import Any  # noqa: F401
 from typing import Awaitable, Dict, List, Optional, Tuple
 
-import trio
 from async_service import Service
+import trio
 
 from libp2p.exceptions import ParseError
 from libp2p.io.exceptions import IncompleteReadError

libp2p/tools/factories.py

@@ -1,9 +1,9 @@
-import trio
-from contextlib import asynccontextmanager, AsyncExitStack
+from contextlib import AsyncExitStack, asynccontextmanager
 from typing import Any, AsyncIterator, Dict, Tuple, cast
 
-import factory
 from async_service import background_trio_service
+import factory
+import trio
 
 from libp2p import generate_new_rsa_identity, generate_peer_id_from
 from libp2p.crypto.keys import KeyPair

libp2p/tools/utils.py

@@ -1,7 +1,7 @@
-import trio
 from typing import List, Sequence, Tuple
 
 import multiaddr
+import trio
 
 from libp2p import new_node
 from libp2p.host.basic_host import BasicHost

libp2p/transport/tcp/tcp.py

@@ -25,7 +25,8 @@ class TCPListener(IListener):
         self.server = None
         self.handler = handler_function
 
-    async def listen(self, maddr: Multiaddr, nursery: trio.Nursery) -> bool:
+    # TODO: Fix handling?
+    async def listen(self, maddr: Multiaddr, nursery: trio.Nursery) -> None:
         """
         put listener in listening mode and wait for incoming connections.
 
@@ -50,16 +51,13 @@ class TCPListener(IListener):
         socket = listeners[0].socket
         self.multiaddrs.append(_multiaddr_from_socket(socket))
 
-        return True
-
     def get_addrs(self) -> List[Multiaddr]:
         """
         retrieve list of addresses the listener is listening on.
 
         :return: return list of addrs
         """
-        # TODO check if server is listening
-        return self.multiaddrs
+        return tuple(self.multiaddrs)
 
     async def close(self) -> None:
         """close the listener such that no more connections can be open on this

tests/network/test_swarm.py

@@ -1,5 +1,5 @@
-import trio
 import pytest
+import trio
 from trio.testing import wait_all_tasks_blocked
 
 from libp2p.network.exceptions import SwarmException

tests/stream_muxer/test_mplex_conn.py

@@ -1,6 +1,5 @@
-import trio
-
 import pytest
+import trio
 
 
 @pytest.mark.trio

tests/stream_muxer/test_mplex_stream.py

@@ -7,11 +7,10 @@ from libp2p.stream_muxer.mplex.exceptions import (
     MplexStreamEOF,
     MplexStreamReset,
 )
-from libp2p.tools.constants import MAX_READ_LEN, LISTEN_MADDR
+from libp2p.tools.constants import LISTEN_MADDR, MAX_READ_LEN
 from libp2p.tools.factories import SwarmFactory
 from libp2p.tools.utils import connect_swarm
 
-
 DATA = b"data_123"
 
 

tests/transport/test_tcp.py

@@ -1,20 +1,47 @@
-import asyncio
-
+from multiaddr import Multiaddr
 import pytest
+import trio
 
-from libp2p.transport.tcp.tcp import _multiaddr_from_socket
+from libp2p.network.connection.raw_connection import RawConnection
+from libp2p.tools.constants import LISTEN_MADDR, MAX_READ_LEN
+from libp2p.transport.tcp.tcp import TCP
 
 
-@pytest.mark.asyncio
-async def test_multiaddr_from_socket():
-    def handler(r, w):
-        pass
+@pytest.mark.trio
+async def test_tcp_listener(nursery):
+    transport = TCP()
 
-    server = await asyncio.start_server(handler, "127.0.0.1", 8000)
-    assert str(_multiaddr_from_socket(server.sockets[0])) == "/ip4/127.0.0.1/tcp/8000"
+    async def handler(tcp_stream):
+        ...
 
-    server = await asyncio.start_server(handler, "127.0.0.1", 0)
-    addr = _multiaddr_from_socket(server.sockets[0])
-    assert addr.value_for_protocol("ip4") == "127.0.0.1"
-    port = addr.value_for_protocol("tcp")
-    assert int(port) > 0
+    listener = transport.create_listener(handler)
+    assert len(listener.get_addrs()) == 0
+    await listener.listen(LISTEN_MADDR, nursery)
+    assert len(listener.get_addrs()) == 1
+    await listener.listen(LISTEN_MADDR, nursery)
+    assert len(listener.get_addrs()) == 2
+
+
+@pytest.mark.trio
+async def test_tcp_dial(nursery):
+    transport = TCP()
+    raw_conn_other_side = None
+
+    async def handler(tcp_stream):
+        nonlocal raw_conn_other_side
+        raw_conn_other_side = RawConnection(tcp_stream, False)
+        await trio.sleep_forever()
+
+    # Test: OSError is raised when trying to dial to a port which no one is not listening to.
+    with pytest.raises(OSError):
+        await transport.dial(Multiaddr("/ip4/127.0.0.1/tcp/1"))
+
+    listener = transport.create_listener(handler)
+    await listener.listen(LISTEN_MADDR, nursery)
+    assert len(listener.multiaddrs) == 1
+    listen_addr = listener.multiaddrs[0]
+    raw_conn = await transport.dial(listen_addr)
+
+    data = b"123"
+    await raw_conn_other_side.write(data)
+    assert (await raw_conn.read(len(data))) == data