Display message if sequence ontology is unavailable (#453)

packages/jbrowse-plugin-apollo/src/OntologyManager/OntologyStore/index.ts

@@ -7,7 +7,12 @@
   UriLocation,
   isUriLocation,
 } from '@jbrowse/core/util'
-import { IDBPTransaction, IndexNames, StoreNames } from 'idb/with-async-ittr'
+import {
+  deleteDB,
+  IDBPTransaction,
+  IndexNames,
+  StoreNames,
+} from 'idb/with-async-ittr'
 
 import { textSearch } from './fulltext'
 import { OntologyDB, OntologyDBEdge, isDeprecated } from './indexeddb-schema'
@@ -176,18 +181,24 @@
       return db
     }
 
-    const { sourceLocation, sourceType } = this
-    if (sourceType === 'obo-graph-json') {
-      await this.loadOboGraphJson(db)
-    } else {
-      throw new Error(
-        `ontology source file ${JSON.stringify(
-          sourceLocation,
-        )} has type ${sourceType}, which is not yet supported`,
-      )
-    }
+    try {
+      const { sourceLocation, sourceType } = this
+      if (sourceType === 'obo-graph-json') {
+        await this.loadOboGraphJson(db)
+      } else {
+        throw new Error(
+          `ontology source file ${JSON.stringify(
+            sourceLocation,
+          )} has type ${sourceType}, which is not yet supported`,
+        )
+      }
 
-    return db
+      return db
+    } catch (error) {
+      db.close()
+      await deleteDB(this.dbName)
+      throw error
+    }
   }
 
   async termCount(tx?: Transaction<['nodes']>) {

packages/jbrowse-plugin-apollo/src/OntologyManager/OntologyStore/indexeddb-storage.ts

@@ -84,9 +84,14 @@
   // TODO: using file streaming along with an event-based json parser
   // instead of JSON.parse and .readFile could probably make this faster
   // and less memory intensive
-  const oboGraph = JSON.parse(
-    await openLocation(this.sourceLocation).readFile('utf8'),
-  ) as GraphDocument
+  let oboGraph: GraphDocument
+  try {
+    oboGraph = JSON.parse(
+      await openLocation(this.sourceLocation).readFile('utf8'),
+    ) as GraphDocument
+  } catch {
+    throw new Error('Error in loading ontology')
+  }
 
   const parseTime = Date.now()
 

packages/jbrowse-plugin-apollo/src/makeDisplayComponent.tsx

@@ -3,7 +3,7 @@
 import type LinearGenomeViewPlugin from '@jbrowse/plugin-linear-genome-view'
 import ExpandLessIcon from '@mui/icons-material/ExpandLess'
 import ExpandMoreIcon from '@mui/icons-material/ExpandMore'
-import { Typography, alpha } from '@mui/material'
+import { Alert, Typography, alpha } from '@mui/material'
 import { observer } from 'mobx-react'
 import React, { useCallback, useEffect, useRef } from 'react'
 import { makeStyles } from 'tss-react/mui'
@@ -14,6 +14,9 @@
 import { SixFrameFeatureDisplay } from './SixFrameFeatureDisplay/stateModel'
 import { TabularEditorPane } from './TabularEditor'
 
+import { getSession } from '@jbrowse/core/util'
+import { ApolloSessionModel } from './session'
+
 const accordionControlHeight = 12
 
 const useStyles = makeStyles()((theme) => ({
@@ -52,6 +55,11 @@
     // position: 'relative',
     userSelect: 'none',
   },
+  alertContainer: {
+    display: 'flex',
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
 }))
 
 function scrollSelectedFeatureIntoView(
@@ -155,6 +163,11 @@
 }: {
   model: LinearApolloDisplayI
 }) {
+  const session = getSession(model) as unknown as ApolloSessionModel
+  const { ontologyManager } = session.apolloDataStore
+  const { featureTypeOntology } = ontologyManager
+  const ontologyStore = featureTypeOntology?.dataStore
+
   const { classes } = useStyles()
 
   const {
@@ -177,6 +190,14 @@
     model.setDetailsHeight(detailsHeight - delta)
   }
 
+  if (!ontologyStore) {
+    return (
+      <div className={classes.alertContainer}>
+        <Alert severity="error">Could not load feature type ontology.</Alert>
+      </div>
+    )
+  }
+
   if (graphical && table) {
     const tabularHeight = tabularEditor.isShown ? detailsHeight : 0
     const featureAreaHeight = isShown