feat: Raise an exception if license is inaccessible

src/ansys/fluent/core/launcher/error_handler.py

@@ -1,10 +1,26 @@
 """Provides a module for customized error handling."""
 
+import os
+
 from ansys.fluent.core.exceptions import InvalidArgument
 from ansys.fluent.core.launcher import launcher_utils
 from ansys.fluent.core.utils.fluent_version import FluentVersion
 
 
+class InaccessibleAnsysLicense(RuntimeError):
+    """Raised when license is inaccessible."""
+
+    def __init__(self):
+        super().__init__(
+            "Enable license server in `Licensing Settings` application and set `ANSYSLMD_LICENSE_FILE` environment variable correctly."
+        )
+
+
+def _check_license():
+    if not os.getenv("ANSYSLMD_LICENSE_FILE", None):
+        raise InaccessibleAnsysLicense()
+
+
 class InvalidPassword(ValueError):
     """Raised when password is invalid."""
 

src/ansys/fluent/core/launcher/launcher.py

@@ -13,6 +13,7 @@
 import ansys.fluent.core as pyfluent
 from ansys.fluent.core.fluent_connection import FluentConnection
 from ansys.fluent.core.launcher.container_launcher import DockerLauncher
+from ansys.fluent.core.launcher.error_handler import _check_license
 from ansys.fluent.core.launcher.launcher_utils import _confirm_watchdog_start
 from ansys.fluent.core.launcher.pim_launcher import PIMLauncher
 from ansys.fluent.core.launcher.pyfluent_enums import (
@@ -261,6 +262,7 @@ def launch_fluent(
     The allocated machines and core counts are queried from the scheduler environment and
     passed to Fluent.
     """
+    _check_license()
     if env is None:
         env = {}