Add support for allow_version_mismatch (L1-2516)

CHANGELOG.md

@@ -1,5 +1,8 @@
 # zhinst-toolkit Changelog
 
+## Version 0.8.0
+* The constructor of `Session` fails when attempting to connect to a data-server on a different LabOne version. This behavior can be overridden by setting the newly added allow_version_mismatch keyword argument to True. When allow_version_mismatch=True is passed to the `Session` constructor the connection to the data-server succeeds even if the version doesn't match.
+
 ## Version 0.7.0
 * Add QHub driver
 

src/zhinst/toolkit/driver/modules/shfqa_sweeper.py

@@ -10,7 +10,6 @@
 from pathlib import Path
 
 import numpy as np
-from zhinst.core import ziDAQServer
 from zhinst.utils.shf_sweeper import AvgConfig, EnvelopeConfig, RfConfig
 from zhinst.utils.shf_sweeper import ShfSweeper as CoreSweeper
 from zhinst.utils.shf_sweeper import SweepConfig, TriggerConfig
@@ -71,11 +70,7 @@ def __init__(self, session: "Session"):
             "force_sw_trigger": "sw_trigger_mode",
         }
         super().__init__(self._create_nodetree(), tuple())
-        self._daq_server = ziDAQServer(
-            session.daq_server.host,
-            session.daq_server.port,
-            6,
-        )
+        self._daq_server = session.clone_underlying_session()
         self._raw_module = CoreSweeper(self._daq_server, "")
         self._session = session
         self.root.update_nodes(

src/zhinst/toolkit/session.py

@@ -1,4 +1,5 @@
 """Module for managing a session to a Data Server through zhinst.core."""
+
 import json
 import typing as t
 from collections.abc import MutableMapping
@@ -654,6 +655,13 @@ class Session(Node):
         connection: Existing DAQ server object. If specified the session will
             not create a new session to the data server but reuse the passed
             one. (default = None)
+        allow_version_mismatch: if set to True, the connection to the data-server
+            will succeed even if the data-server is on a different version of LabOne.
+            If False, an exception will be raised if the data-server is on a
+            different version. (default = False)
+
+    .. versionchanged:: 0.8.0
+        Added `allow_version_mismatch` argument.
     """
 
     def __init__(
@@ -663,6 +671,7 @@ def __init__(
         *,
         hf2: t.Optional[bool] = None,
         connection: t.Optional[core.ziDAQServer] = None,
+        allow_version_mismatch: bool = False,
     ):
         self._is_hf2_server = bool(hf2)
         if connection is not None:
@@ -683,10 +692,8 @@ def __init__(
             if self._is_hf2_server and server_port == 8004:
                 server_port = 8005
             try:
-                self._daq_server = core.ziDAQServer(
-                    server_host,
-                    server_port,
-                    1 if self._is_hf2_server else 6,
+                self._daq_server = self._create_daq(
+                    server_host, server_port, allow_version_mismatch
                 )
             except RuntimeError as error:
                 if "Unsupported API level" not in error.args[0]:
@@ -987,3 +994,37 @@ def server_host(self) -> str:
     def server_port(self) -> int:
         """Server port."""
         return self._daq_server.port
+
+    def clone_underlying_session(self) -> core.ziDAQServer:
+        """Create a new session to the data server.
+
+        Create a new core.ziDAQServer connected to the same data-server this
+        session is connected to.
+        """
+        # Don't execute version checking. When clone_underlying_session is called,
+        # a connection has already been made, so checking again would be redundant.
+        return self._create_daq(self.server_host, self.server_port, True)
+
+    def _create_daq(
+        self,
+        server_host: str,
+        server_port: int,
+        allow_version_mismatch: bool,
+    ):
+        """Create a new session to the data server.
+
+        Attempt to pass the allow_version_mismatch flag. Fallback in case
+        zhinst.core does not support it yet.
+        """
+        api_level = 1 if self._is_hf2_server else 6
+        try:
+            return core.ziDAQServer(
+                server_host,
+                server_port,
+                api_level,
+                allow_version_mismatch=allow_version_mismatch,
+            )
+        except TypeError as error:
+            if "allow_version_mismatch" not in error.args[0]:
+                raise
+            return core.ziDAQServer(server_host, server_port, api_level)

tests/conftest.py

@@ -45,7 +45,6 @@ def hf2_session(mock_connection):
 
 @pytest.fixture()
 def shfqa(data_dir, mock_connection, session):
-
     json_path = data_dir / "nodedoc_dev1234_shfqa.json"
     with json_path.open("r", encoding="UTF-8") as file:
         nodes_json = file.read()
@@ -62,7 +61,6 @@ def shfqa(data_dir, mock_connection, session):
 
 @pytest.fixture()
 def shfsg(data_dir, mock_connection, session):
-
     json_path = data_dir / "nodedoc_dev1234_shfsg.json"
     with json_path.open("r", encoding="UTF-8") as file:
         nodes_json = file.read()
@@ -74,7 +72,6 @@ def shfsg(data_dir, mock_connection, session):
 
 @pytest.fixture()
 def shfqc(data_dir, mock_connection, session):
-
     json_path = data_dir / "nodedoc_dev1234_shfqc.json"
     with json_path.open("r", encoding="UTF-8") as file:
         nodes_json = file.read()
@@ -96,11 +93,3 @@ def nodedoc_dev1234_json(data_dir):
     json_path = data_dir / "nodedoc_dev1234.json"
     with json_path.open("r", encoding="UTF-8") as file:
         return file.read()
-
-
-@pytest.fixture()
-def mock_sweeper_daq():
-    with patch(
-        "zhinst.toolkit.driver.modules.shfqa_sweeper.ziDAQServer", autospec=True
-    ) as connection:
-        yield connection

tests/test_data_server_session.py

@@ -1,5 +1,5 @@
 import json
-from unittest.mock import patch
+from unittest.mock import MagicMock, patch
 
 import pytest
 
@@ -9,7 +9,9 @@
 
 
 def test_setup(mock_connection, session):
-    mock_connection.assert_called_once_with("localhost", 8004, 6)
+    mock_connection.assert_called_once_with(
+        "localhost", 8004, 6, allow_version_mismatch=False
+    )
     mock_connection.return_value.listNodesJSON.assert_called_once_with("/zi/*")
     assert repr(session) == "DataServerSession(localhost:8004)"
     assert not session.is_hf2_server
@@ -18,12 +20,60 @@ def test_setup(mock_connection, session):
 
 
 def test_setup_hf2(mock_connection, hf2_session):
-    mock_connection.assert_called_once_with("localhost", 8005, 1)
+    mock_connection.assert_called_once_with(
+        "localhost", 8005, 1, allow_version_mismatch=False
+    )
     mock_connection.return_value.listNodesJSON.assert_not_called()
     assert repr(hf2_session) == "HF2DataServerSession(localhost:8005)"
     assert hf2_session.is_hf2_server
 
 
+def test_allow_mismatch_not_supported(mock_connection, nodedoc_zi_json):
+    mock_daq = MagicMock()
+    mock_daq.listNodesJSON.return_value = nodedoc_zi_json
+
+    def create_daq(*args, **kwargs):
+        if "allow_version_mismatch" in kwargs:
+            raise TypeError("allow_version_mismatch not recognized")
+        return mock_daq
+
+    mock_connection.side_effect = create_daq
+    Session("localhost", 8004)
+    mock_connection.assert_any_call("localhost", 8004, 6, allow_version_mismatch=False)
+    mock_connection.assert_called_with("localhost", 8004, 6)
+
+
+# Passing "allow_version_mismatch" does not cause an error, even if the underlying
+# zhinst.core does not recognize this flag.
+def test_allow_mismatch_passed_but_not_supported(mock_connection, nodedoc_zi_json):
+    mock_daq = MagicMock()
+    mock_daq.listNodesJSON.return_value = nodedoc_zi_json
+
+    def create_daq(*args, **kwargs):
+        if "allow_version_mismatch" in kwargs:
+            raise TypeError("allow_version_mismatch not recognized")
+        return mock_daq
+
+    mock_connection.side_effect = create_daq
+    Session("localhost", 8004, allow_version_mismatch=True)
+    mock_connection.assert_any_call("localhost", 8004, 6, allow_version_mismatch=True)
+    mock_connection.assert_called_with("localhost", 8004, 6)
+
+
+def test_allow_mismatch_default(mock_connection, nodedoc_zi_json):
+    mock_daq = MagicMock()
+    mock_daq.listNodesJSON.return_value = nodedoc_zi_json
+
+    def create_daq(*args, **kwargs):
+        return mock_daq
+
+    mock_connection.side_effect = create_daq
+    Session("localhost", 8004)
+    mock_connection.assert_called_once_with(
+        "localhost", 8004, 6, allow_version_mismatch=False
+    )
+
+
 def test_existing_connection(nodedoc_zi_json, mock_connection):
     mock_connection.listNodesJSON.return_value = nodedoc_zi_json
     mock_connection.getString.return_value = "DataServer"
@@ -77,7 +127,6 @@ def test_unkown_init_error(mock_connection):
 def test_connect_device(
     zi_devices_json, mock_connection, session, nodedoc_dev1234_json
 ):
-
     connected_devices = ""
 
     def get_string_side_effect(arg):
@@ -137,7 +186,6 @@ def connect_device_side_effect(serial, _):
 def test_connect_device_autodetection(
     zi_devices_json, mock_connection, session, nodedoc_dev1234_json
 ):
-
     connected_devices = ""
     selected_interface = ""
 
@@ -478,7 +526,7 @@ def test_sweeper_module(data_dir, mock_connection, session):
     assert isinstance(sweeper_module.device, Node)
 
 
-def test_shfqa_sweeper(session, mock_sweeper_daq):
+def test_shfqa_sweeper(session):
     sweeper = session.modules.shfqa_sweeper
     assert sweeper == session.modules.shfqa_sweeper
     assert isinstance(sweeper, tk_modules.SHFQASweeper)
@@ -487,7 +535,6 @@ def test_shfqa_sweeper(session, mock_sweeper_daq):
 def test_session_wide_transaction(
     mock_connection, nodedoc_dev1234_json, session, shfqa, shfsg
 ):
-
     # Hack devices into the created once
     session._devices._devices = {"dev1": shfqa, "dev2": shfsg}
 

tests/test_shfqa_sweeper.py

@@ -33,15 +33,15 @@ def mock_TriggerConfig():
 
 
 @pytest.fixture()
-def sweeper_module(session, mock_sweeper_daq, mock_shf_sweeper):
+def sweeper_module(session, mock_shf_sweeper):
     yield SHFQASweeper(session)
 
 
 def test_repr(sweeper_module):
     assert "SHFQASweeper(DataServerSession(localhost:8004))" in repr(sweeper_module)
 
 
-def test_missing_node(mock_connection, mock_shf_sweeper, mock_sweeper_daq, session):
+def test_missing_node(mock_connection, mock_shf_sweeper, session):
     with patch(
         "zhinst.toolkit.driver.modules.shfqa_sweeper.SweepConfig",
         make_dataclass("Y", fields=[("s", str, 0)], bases=(SweepConfig,)),
@@ -50,13 +50,11 @@ def test_missing_node(mock_connection, mock_shf_sweeper, mock_sweeper_daq, sessi
         assert sweeper_module.sweep.s() == 0
 
 
-def test_device(
-    mock_connection, sweeper_module, session, mock_shf_sweeper, mock_sweeper_daq
-):
+def test_device(mock_connection, sweeper_module, session, mock_shf_sweeper):
     assert sweeper_module.device() == ""
 
     sweeper_module.device("dev1234")
-    mock_shf_sweeper.assert_called_with(mock_sweeper_daq(), "dev1234")
+    mock_shf_sweeper.assert_called_with(sweeper_module._daq_server, "dev1234")
     assert sweeper_module.device() == "dev1234"
 
     connected_devices = "dev1234"
@@ -73,17 +71,15 @@ def get_string_side_effect(arg):
     assert sweeper_module.device() == session.devices["dev1234"]
 
 
-def test_update_settings(
-    mock_connection, sweeper_module, mock_shf_sweeper, mock_sweeper_daq
-):
+def test_update_settings(sweeper_module, mock_shf_sweeper):
     assert not sweeper_module.envelope.enable()
     mock_shf_sweeper.assert_called_with(sweeper_module._daq_server, "")
     # device needs to be set first
     with pytest.raises(RuntimeError) as e_info:
         sweeper_module._update_settings()
 
     sweeper_module.device("dev1234")
-    mock_shf_sweeper.assert_called_with(mock_sweeper_daq(), "dev1234")
+    mock_shf_sweeper.assert_called_with(sweeper_module._daq_server, "dev1234")
     sweeper_module._update_settings()
     mock_shf_sweeper.return_value.configure.assert_called_once()
     assert "sweep_config" in mock_shf_sweeper.return_value.configure.call_args[1]
@@ -135,7 +131,6 @@ def test_update_settings_broken(
     mock_shf_sweeper,
     caplog,
 ):
-
     sweeper_module.device("dev1234")
     sweeper_module._update_settings()
     assert (
@@ -157,31 +152,27 @@ def test_update_settings_broken(
 
 
 def test_run(sweeper_module, mock_shf_sweeper):
-
     sweeper_module.device("dev1234")
     sweeper_module.run()
     mock_shf_sweeper.return_value.configure.assert_called_once()
     mock_shf_sweeper.return_value.run.assert_called_once()
 
 
 def test_get_result(sweeper_module, mock_shf_sweeper):
-
     sweeper_module.device("dev1234")
     sweeper_module.get_result()
     mock_shf_sweeper.return_value.configure.assert_called_once()
     mock_shf_sweeper.return_value.get_result.assert_called_once()
 
 
 def test_plot(sweeper_module, mock_shf_sweeper):
-
     sweeper_module.device("dev1234")
     sweeper_module.plot()
     mock_shf_sweeper.return_value.configure.assert_called_once()
     mock_shf_sweeper.return_value.plot.assert_called_once()
 
 
 def test_get_offset_freq_vector(sweeper_module, mock_shf_sweeper):
-
     sweeper_module.device("dev1234")
     sweeper_module.get_offset_freq_vector()
     mock_shf_sweeper.return_value.configure.assert_called_once()