perspectives: custom join over different databases

packages/web/src/utility/useMultipleDatabaseInfo.ts

@@ -0,0 +1,19 @@
+import { Readable, writable } from 'svelte/store';
+import { getDatabaseInfo } from './metadataLoaders';
+import { MultipleDatabaseInfo } from 'dbgate-datalib';
+
+export function useMultipleDatabaseInfo(dbs: { conid: string; database: string }[]): Readable<MultipleDatabaseInfo> {
+  const res = writable({});
+  for (const { conid, database } of dbs) {
+    getDatabaseInfo({ conid, database }).then(dbInfo => {
+      res.update(old => ({
+        ...old,
+        [conid]: {
+          ...old[conid],
+          [database]: dbInfo,
+        },
+      }));
+    });
+  }
+  return res;
+}