feat: continue working on indexer's absence (#2248)

* feat: continue working on indexer's absence

* feat: treat 'none' and 'NONE' as equals

src/backend/revoker/indexer/queryFromIndexer.ts

@@ -38,13 +38,30 @@ export async function queryFromIndexer<ExpectedQueryResults>(query: string) {
   logger.debug(
     `Querying from GraphQL under ${indexer.graphqlEndpoint}, using this payload: ${query} `,
   );
-  const { data } = await got
-    .post(indexer.graphqlEndpoint, {
-      json: {
-        query,
-      },
-    })
-    .json<FetchedData<ExpectedQueryResults>>();
+
+  const responsePromise = got.post(indexer.graphqlEndpoint, {
+    json: {
+      query,
+    },
+  });
+
+  // handle bad responses
+  try {
+    await responsePromise;
+  } catch (error) {
+    logger.error(
+      `Error response coming from ${indexer.graphqlEndpoint}: ${JSON.stringify(error, null, 2)}`,
+    );
+    logger.info(`Continuing as if there where no matches to the query.`);
+    return {
+      totalCount: 0,
+      matches: Array.of<ExpectedQueryResults>(),
+    };
+  }
+
+  // handle good responses
+  const { data } =
+    await responsePromise.json<FetchedData<ExpectedQueryResults>>();
 
   const entities = Object.entries(data);
 
@@ -81,7 +98,7 @@ export async function queryFromIndexer<ExpectedQueryResults>(query: string) {
 export async function* matchesGenerator<ExpectedQueryResults>(
   buildQuery: (offset: number) => string,
 ): AsyncGenerator<ExpectedQueryResults, void> {
-  if (indexer.graphqlEndpoint === 'NONE') {
+  if (String(indexer.graphqlEndpoint).toUpperCase() === 'NONE') {
     return;
   }
   const query = buildQuery(0);