Add connect utility function

tests/interop/utils.py

@@ -0,0 +1,40 @@
+import asyncio
+from typing import Union
+
+from multiaddr import Multiaddr
+
+from libp2p.host.host_interface import IHost
+from libp2p.peer.peerinfo import PeerInfo
+
+from .daemon import Daemon
+
+TDaemonOrHost = Union[IHost, Daemon]
+
+
+async def connect(a: TDaemonOrHost, b: TDaemonOrHost) -> None:
+    # Type check
+    err_msg = (
+        f"Type of type(a)={type(a)} or type(b)={type(b)} is wrong."
+        "Should be either `IHost` or `Daemon`"
+    )
+    assert all(
+        [isinstance(node, IHost) or isinstance(node, Daemon) for node in (a, b)]
+    ), err_msg
+
+    # TODO: Get peer info
+    peer_info: PeerInfo
+    if isinstance(b, Daemon):
+        peer_info = b.peer_info
+    else:  # isinstance(b, IHost)
+        peer_id = b.get_id()
+        maddrs = [
+            b.get_addrs()[0].decapsulate(Multiaddr(f"/p2p/{peer_id.to_string()}"))
+        ]
+        peer_info = PeerInfo(peer_id, maddrs)
+    # TODO: connect to peer info
+    if isinstance(a, Daemon):
+        await a.control.connect(peer_info.peer_id, peer_info.addrs)
+    else:  # isinstance(b, IHost)
+        await a.connect(peer_info)
+    # Allow additional sleep for both side to establish the connection.
+    await asyncio.sleep(0.01)