🎨 [Frontend] Check all linked nodes exist before loading Study

services/static-webserver/client/source/class/osparc/data/model/Node.js

@@ -312,7 +312,19 @@ qx.Class.define("osparc.data.model.Node", {
         return outputs[outputKey]["value"];
       }
       return null;
-    }
+    },
+
+    getLinkedNodeIds: function(nodeData) {
+      const linkedNodeIds = new Set([]);
+      if ("inputs" in nodeData) {
+        Object.values(nodeData["inputs"]).forEach(link => {
+          if (link && typeof link === "object" && "nodeUuid" in link) {
+            linkedNodeIds.add(link["nodeUuid"]);
+          }
+        });
+      }
+      return Array.from(linkedNodeIds);
+    },
   },
 
   members: {

services/static-webserver/client/source/class/osparc/data/model/Study.js

@@ -345,7 +345,18 @@ qx.Class.define("osparc.data.model.Study", {
         "STARTED",
         "RETRY"
       ].includes(state);
-    }
+    },
+
+    __isAnyLinkedNodeMissing: function(studyData) {
+      const existingNodeIds = Object.keys(studyData["workbench"]);
+      const linkedNodeIds = osparc.data.model.Workbench.getLinkedNodeIds(studyData["workbench"]);
+      const allExist = linkedNodeIds.every(linkedNodeId => existingNodeIds.includes(linkedNodeId));
+      return !allExist;
+    },
+
+    isCorrupt: function(studyData) {
+      return this.__isAnyLinkedNodeMissing(studyData);
+    },
   },
 
   members: {

services/static-webserver/client/source/class/osparc/data/model/Workbench.js

@@ -78,7 +78,16 @@ qx.Class.define("osparc.data.model.Workbench", {
 
   statics: {
     CANT_ADD_NODE: qx.locale.Manager.tr("Nodes can't be added while the pipeline is running"),
-    CANT_DELETE_NODE: qx.locale.Manager.tr("Nodes can't be deleted while the pipeline is running")
+    CANT_DELETE_NODE: qx.locale.Manager.tr("Nodes can't be deleted while the pipeline is running"),
+
+    getLinkedNodeIds: function(workbenchData) {
+      const linkedNodeIDs = new Set([]);
+      Object.values(workbenchData).forEach(nodeData => {
+        const linkedNodes = osparc.data.model.Node.getLinkedNodeIds(nodeData);
+        linkedNodes.forEach(linkedNodeID => linkedNodeIDs.add(linkedNodeID))
+      });
+      return Array.from(linkedNodeIDs);
+    },
   },
 
   members: {

services/static-webserver/client/source/class/osparc/desktop/MainPageHandler.js

@@ -85,20 +85,29 @@ qx.Class.define("osparc.desktop.MainPageHandler", {
     },
 
     loadStudy: function(studyData) {
+      const studyAlias = osparc.product.Utils.getStudyAlias({firstUpperCase: true});
+      // check if it's locked
       let locked = false;
       let lockedBy = false;
       if ("state" in studyData && "locked" in studyData["state"]) {
         locked = studyData["state"]["locked"]["value"];
         lockedBy = studyData["state"]["locked"]["owner"];
       }
       if (locked && lockedBy["user_id"] !== osparc.auth.Data.getInstance().getUserId()) {
-        const msg = `${qx.locale.Manager.tr("Study is already open by ")} ${
+        const msg = `${studyAlias} ${qx.locale.Manager.tr("is already open by")} ${
           "first_name" in lockedBy && lockedBy["first_name"] != null ?
             lockedBy["first_name"] :
             qx.locale.Manager.tr("another user.")
         }`;
         throw new Error(msg);
       }
+
+      // check if it's corrupt
+      if (osparc.data.model.Study.isCorrupt(studyData)) {
+        const msg = `${qx.locale.Manager.tr("We encountered an issue with the")} ${studyAlias} <br>${qx.locale.Manager.tr("Please contact support.")}`;
+        throw new Error(msg);
+      }
+
       this.setLoadingPageHeader(qx.locale.Manager.tr("Loading ") + studyData.name);
       this.showLoadingPage();
       const inaccessibleServices = osparc.study.Utils.getInaccessibleServices(studyData["workbench"])