BUGFIX: prevent gaia from querying server at import time

astroquery/gaia/core.py

@@ -55,7 +55,7 @@
                  gaia_data_server='https://gea.esac.esa.int/',
                  tap_server_context="tap-server",
                  data_server_context="data-server",
-                 verbose=False, show_server_messages=True):
+                 verbose=False, show_server_messages=False):
         super(GaiaClass, self).__init__(url=gaia_tap_server,
                                         server_context=tap_server_context,
                                         tap_context="tap",
@@ -1168,23 +1168,19 @@
         """Retrieve the messages to inform users about
         the status of Gaia TAP
         """
-        try:
-            sub_context = self.GAIA_MESSAGES
-            conn_handler = self._TapPlus__getconnhandler()
-            response = conn_handler.execute_tapget(sub_context, verbose=False)
-            if response.status == 200:
-                if isinstance(response, Iterable):
-                    for line in response:
-
-                        try:
-                            print(line.decode("utf-8").split('=', 1)[1])
-                        except ValueError as e:
-                            print(e)
-                        except IndexError:
-                            print("Archive down for maintenance")
-
-        except OSError:
-            print("Status messages could not be retrieved")
+        sub_context = self.GAIA_MESSAGES
+        conn_handler = self._TapPlus__getconnhandler()
+        response = conn_handler.execute_tapget(sub_context, verbose=False)
+        if response.status == 200:
+            if isinstance(response, Iterable):
+                for line in response:
+
+                    try:
+                        print(line.decode("utf-8").split('=', 1)[1])
+                    except ValueError as e:
+                        print(e)
+                    except IndexError:
+                        print("Archive down for maintenance")
 
 
 Gaia = GaiaClass()

astroquery/tests/test_imports.py

@@ -0,0 +1,101 @@
+# Licensed under a 3-clause BSD style license - see LICENSE.rst
+import sys
+import importlib
+import pytest
+import socket
+from unittest.mock import patch
+from pytest_remotedata.disable_internet import no_internet
+from pytest_remotedata.disable_internet import INTERNET_OFF
+
+# List of all astroquery modules to test
+ASTROQUERY_MODULES = [
+    'astroquery.alma',
+    'astroquery.astrometry_net',
+    'astroquery.besancon',
+    'astroquery.cadc',
+    'astroquery.cosmosim',
+    'astroquery.esa',
+    'astroquery.esasky',
+    'astroquery.eso',
+    'astroquery.exoplanet_orbit_database',
+    'astroquery.fermi',
+    'astroquery.gaia',
+    'astroquery.gama',
+    'astroquery.gemini',
+    'astroquery.heasarc',
+    'astroquery.hitran',
+    'astroquery.ipac.irsa.ibe',
+    'astroquery.hips2fits',
+    'astroquery.image_cutouts',
+    'astroquery.imcce',
+    'astroquery.ipac',
+    'astroquery.ipac.irsa',
+    'astroquery.ipac.irsa.irsa_dust',
+    'astroquery.ipac.ned',
+    'astroquery.ipac.nexsci.nasa_exoplanet_archive',
+    'astroquery.jplhorizons',
+    'astroquery.jplsbdb',
+    'astroquery.jplspec',
+    'astroquery.linelists',
+    'astroquery.magpis',
+    'astroquery.mast',
+    'astroquery.mocserver',
+    'astroquery.mpc',
+    'astroquery.nasa_ads',
+    'astroquery.nist',
+    'astroquery.nvas',
+    'astroquery.oac',
+    'astroquery.ogle',
+    'astroquery.open_exoplanet_catalogue',
+    'astroquery.sdss',
+    'astroquery.simbad',
+    'astroquery.skyview',
+    'astroquery.solarsystem',
+    'astroquery.splatalogue',
+    'astroquery.svo_fps',
+    'astroquery.utils',
+    'astroquery.vamdc',
+    'astroquery.vo_conesearch',
+    'astroquery.vizier',
+    'astroquery.vsa',
+    'astroquery.wfau',
+    'astroquery.xmatch',
+]
+
+class SocketTracker:
+    def __init__(self):
+        self.socket_attempts = []
+
+    def __call__(self, *args, **kwargs):
+        # Record the attempt
+        self.socket_attempts.append((args, kwargs))
+        # Raise a clear error to indicate socket creation
+        raise RuntimeError("Socket creation attempted during import")
+
+
+@pytest.mark.parametrize("module_name", ASTROQUERY_MODULES)
+def test_no_http_calls_during_import(module_name):
+    """
+    Test that importing astroquery modules does not make any remote calls.
+
+    This is a regression test for 3343, and the error that raises is not
+    properly caught by the framework below, but that's an unrelated issue.
+
+    This is the error shown if Gaia(show_server_messages=True) is called:
+    ```
+    E       TypeError: isinstance() arg 2 must be a type, a tuple of types, or a union
+    ```
+    """
+    with no_internet():
+        if module_name in sys.modules:
+            del sys.modules[module_name]
+
+        tracker = SocketTracker()
+        with patch('socket.socket', tracker):
+            importlib.import_module(module_name)
+
+        assert not tracker.socket_attempts, (
+            f"Module {module_name} attempted to create {len(tracker.socket_attempts)} "
+            f"socket(s) during import:\n" +
+            "\n".join(f"  - {args} {kwargs}" for args, kwargs in tracker.socket_attempts)
+        )