buildModel: allow recoverable 'error'-level OMC messages via raise_on_error

OMPython/OMCSession.py

@@ -282,14 +282,14 @@ def omcpath_tempdir(self, tempdir_base: Optional[OMPathABC] = None) -> OMPathABC
     def execute(self, command: str):
         return self.omc_process.execute(command=command)
 
-    def sendExpression(self, command: str, parsed: bool = True) -> Any:
+    def sendExpression(self, command: str, parsed: bool = True, raise_on_error: bool = True) -> Any:
         """
         Send an expression to the OMC server and return the result.
 
         The complete error handling of the OMC result is done within this method using '"getMessagesStringInternal()'.
         Caller should only check for OMSessionException.
         """
-        return self.omc_process.sendExpression(expr=command, parsed=parsed)
+        return self.omc_process.sendExpression(expr=command, parsed=parsed, raise_on_error=raise_on_error)
 
     def get_version(self) -> str:
         return self.omc_process.get_version()

OMPython/modelica_system_omc.py

@@ -203,7 +203,11 @@ def buildModel(self, variableFilter: Optional[str] = None):
         else:
             var_filter = 'variableFilter=".*"'
 
-        build_model_result = self._requestApi(apiName="buildModel", entity=self._model_name, properties=var_filter)
+        # buildModel() can emit 'error'-level diagnostics (e.g. a structurally singular initialization
+        # system) that OMC itself recovers from without actually failing the build. Don't raise on those
+        # here; check_model_executable()/_xmlparse() below independently verify the build really succeeded.
+        build_model_result = self._requestApi(apiName="buildModel", entity=self._model_name, properties=var_filter,
+                                               raise_on_error=False)
         logger.debug("OM model build result: %s", build_model_result)
 
         # check if the executable exists ...
@@ -212,12 +216,12 @@ def buildModel(self, variableFilter: Optional[str] = None):
         xml_file = self._session.omcpath(build_model_result[0]).parent / build_model_result[1]
         self._xmlparse(xml_file=xml_file)
 
-    def sendExpression(self, expr: str, parsed: bool = True) -> Any:
+    def sendExpression(self, expr: str, parsed: bool = True, raise_on_error: bool = True) -> Any:
         """
         Wrapper for OMCSession.sendExpression().
         """
         try:
-            retval = self._session.sendExpression(expr=expr, parsed=parsed)
+            retval = self._session.sendExpression(expr=expr, parsed=parsed, raise_on_error=raise_on_error)
         except OMSessionException as ex:
             raise ModelicaSystemError(f"Error executing {repr(expr)}: {ex}") from ex
 
@@ -231,6 +235,7 @@ def _requestApi(
             apiName: str,
             entity: Optional[str] = None,
             properties: Optional[str] = None,
+            raise_on_error: bool = True,
     ) -> Any:
         if entity is not None and properties is not None:
             expr = f'{apiName}({entity}, {properties})'
@@ -242,7 +247,7 @@ def _requestApi(
         else:
             expr = f'{apiName}()'
 
-        return self.sendExpression(expr=expr)
+        return self.sendExpression(expr=expr, raise_on_error=raise_on_error)
 
     def getContinuousFinal(
             self,

OMPython/om_session_abc.py

@@ -317,7 +317,10 @@ def _tempdir(tempdir_base: OMPathABC) -> OMPathABC:
         return tempdir
 
     @abc.abstractmethod
-    def sendExpression(self, expr: str, parsed: bool = True) -> Any:
+    def sendExpression(self, expr: str, parsed: bool = True, raise_on_error: bool = True) -> Any:
         """
         Function needed to send expressions to the OMC server via ZMQ.
+
+        If raise_on_error is False, 'error'-level OMC diagnostics are logged instead of raised as an
+        OMSessionException; use this only when the caller has its own, more precise way of verifying success.
         """

OMPython/om_session_omc.py

@@ -387,12 +387,18 @@ def execute(self, command: str):
 
         return self.sendExpression(command, parsed=False)
 
-    def sendExpression(self, expr: str, parsed: bool = True) -> Any:
+    def sendExpression(self, expr: str, parsed: bool = True, raise_on_error: bool = True) -> Any:
         """
         Send an expression to the OMC server and return the result.
 
         The complete error handling of the OMC result is done within this method using 'getMessagesStringInternal()'.
         Caller should only check for OMSessionException.
+
+        Some OMC API calls (e.g. buildModel) can emit 'error'-level diagnostics that are recoverable and don't
+        actually prevent the call from succeeding (e.g. a structurally singular initialization system that OMC
+        resolves via a fallback). Callers who have their own, more precise way of verifying success (such as
+        checking that the resulting files/executable actually exist) can pass raise_on_error=False to have such
+        messages logged instead of raised as an exception.
         """
 
         if self._omc_zmq is None:
@@ -509,8 +515,11 @@ def sendExpression(self, expr: str, parsed: bool = True) -> Any:
                 msg_long_list.append(msg_long)
             if has_error:
                 msg_long_str = '\n'.join(f"{idx:02d}: {msg}" for idx, msg in enumerate(msg_long_list))
-                raise OMSessionException(f"OMC error occurred for 'sendExpression(expr={expr}, parsed={parsed}):\n"
-                                         f"{msg_long_str}")
+                if raise_on_error:
+                    raise OMSessionException(
+                        f"OMC error occurred for 'sendExpression(expr={expr}, parsed={parsed}):\n{msg_long_str}")
+                logger.warning("OMC reported 'error'-level messages for 'sendExpression(expr=%s, parsed=%s)', but "
+                               "raise_on_error=False was requested; continuing:\n%s", expr, parsed, msg_long_str)
 
         if not parsed:
             return result

OMPython/om_session_runner.py

@@ -379,5 +379,5 @@ def omcpath_tempdir(self, tempdir_base: Optional[OMPathABC] = None) -> OMPathABC
 
         return self._tempdir(tempdir_base=tempdir_base)
 
-    def sendExpression(self, expr: str, parsed: bool = True) -> Any:
+    def sendExpression(self, expr: str, parsed: bool = True, raise_on_error: bool = True) -> Any:
         raise OMSessionException(f"{self.__class__.__name__} does not uses an OMC server!")