added exception to handle use sessions error

Author: sanderegg

services/web/server/src/simcore_service_webserver/projects/_controller/_rest_exceptions.py

@@ -44,6 +44,7 @@
     ProjectOwnerNotFoundInTheProjectAccessRightsError,
     ProjectStartsTooManyDynamicNodesError,
     ProjectTooManyProjectOpenedError,
+    ProjectTooManyUserSessionsError,
     ProjectTypeAndTemplateIncompatibilityError,
     ProjectWalletPendingTransactionError,
     WrongTagIdsInQueryError,
@@ -148,6 +149,13 @@
             _version=1,
         ),
     ),
+    ProjectTooManyUserSessionsError: HttpErrorInfo(
+        status.HTTP_409_CONFLICT,
+        user_message(
+            "You cannot open more than {max_num_sessions} session(s) for the same project at once. Please close another session and retry.",
+            _version=1,
+        ),
+    ),
     ProjectInDebtCanNotChangeWalletError: HttpErrorInfo(
         status.HTTP_402_PAYMENT_REQUIRED,
         user_message(

services/web/server/src/simcore_service_webserver/projects/_projects_service.py

@@ -152,6 +152,7 @@
     ProjectOwnerNotFoundInTheProjectAccessRightsError,
     ProjectStartsTooManyDynamicNodesError,
     ProjectTooManyProjectOpenedError,
+    ProjectTooManyUserSessionsError,
     ProjectTypeAndTemplateIncompatibilityError,
 )
 from .models import ProjectDict, ProjectPatchInternalExtended
@@ -1415,13 +1416,23 @@ async def _open_project() -> bool:
                 sessions_with_project = await user_session.find_users_of_resource(
                     app, PROJECT_ID_KEY, f"{project_uuid}"
                 )
+                if max_number_of_user_sessions_per_project is not None and (
+                    len(sessions_with_project)
+                    >= max_number_of_user_sessions_per_project
+                ):
+                    raise ProjectTooManyUserSessionsError(
+                        max_num_sessions=max_number_of_user_sessions_per_project,
+                        user_id=user_id,
+                        project_uuid=project_uuid,
+                        client_session_id=client_session_id,
+                    )
                 if (
                     max_number_of_user_sessions_per_project is None
                     or not sessions_with_project
                 ) or (
                     len(sessions_with_project) < max_number_of_user_sessions_per_project
                 ):
-                    # no one has the project so we assign it
+                    # if there are no sessions with this project, or the number of sessions is less than the maximum allowed
                     await user_session.add(PROJECT_ID_KEY, f"{project_uuid}")
                     return True
 

services/web/server/src/simcore_service_webserver/projects/exceptions.py

@@ -147,13 +147,21 @@ def __init__(self, *, user_id: UserID, project_uuid: ProjectID, **ctx):
 
 
 class ProjectTooManyProjectOpenedError(BaseProjectError):
-    msg_template = "You cannot open more than {max_num_projects} study/ies at once. Please close another study and retry."
+    msg_template = "You cannot open more than {max_num_projects} project/s at once. Please close another project and retry."
 
     def __init__(self, *, max_num_projects: int, **ctx):
         super().__init__(**ctx)
         self.max_num_projects = max_num_projects
 
 
+class ProjectTooManyUserSessionsError(BaseProjectError):
+    msg_template = "You cannot open more than {max_num_sessions} session(s) for the same project at once. Please close another session and retry."
+
+    def __init__(self, *, max_num_sessions: int, **ctx):
+        super().__init__(**ctx)
+        self.max_num_sessions = max_num_sessions
+
+
 class PermalinkNotAllowedError(BaseProjectError): ...