Adapt external.py to upcoming changes in QNodeOS 2.0

Author: Thom747

.gitignore

@@ -12,3 +12,5 @@ htmlcov/
 .coverage
 .idea/*
 .vscode/*
+
+venv/

netqasm/sdk/external.py

@@ -21,14 +21,39 @@
 
 if is_using_hardware:
     try:
-        from qnodeos.sdk.connection import (
-            QNodeOSConnection as NetQASMConnection,  # type: ignore
-        )
-        from qnodeos.sdk.socket import Socket  # type: ignore
-
-        from netqasm.runtime.hardware import run_application  # type: ignore
+        from qnodeos.connection import *
+        from qnodeos.socket import *
     except ModuleNotFoundError:
-        raise ModuleNotFoundError("to use QNodeOS , `qnodeos` needs to be installed")
+        raise ModuleNotFoundError("To use QNodeOS , `qnodeos` needs to be installed")
+
+    from netqasm.runtime.hardware import run_application  # type: ignore
+
+    from abc import ABC
+    from netqasm.sdk.classical_communication.socket import Socket as ABCSocket
+    from netqasm.sdk.connection import BaseNetQASMConnection
+
+
+    class NetQASMConnection(BaseNetQASMConnection, ABC):
+        """
+        QNodeOS has dropped support for direct instantiations of `NetQASMConnection`.
+        Use `qnodeos.connection.QNodeOSConnectionFactory` to create connections.
+        """
+        pass
+
+
+    class Socket(ABCSocket, ABC):
+        """
+        QNodeOS has dropped support for `Socket`.
+        Use `qnodeos.socket.[Client,Server]AppSocket` instead.
+        """
+        pass
+
+
+    raise DeprecationWarning(
+        "QNodeOS has dropped support for `NetQASMConnection` and `Socket`."
+        " Use `qnodeos.connection.QNodeOSConnectionFactory` to create connections and"
+        " use `qnodeos.socket.[Client,Server]AppSocket` to replace `Socket`.")
+
 elif simulator == Simulator.NETSQUID:
     try:
         from squidasm.nqasm.multithread import (