implemented SlopStore and tested

src/indexed-db.ts

@@ -56,12 +56,24 @@ export class SlopStore {
         this.slopdb = slopdb
     }
 
-    async store(domain: string, path: string) {
-
+    async store(domain: string, path: string): Promise<IDBValidKey> {
+        const slop_store = this.slopdb.transaction(SlopStore.slop_objectstore_name, "readwrite").objectStore(SlopStore.slop_objectstore_name)
+        const existing_domain = await slop_store.get(domain)
+        if(existing_domain) {
+            // append this path to the existing domain object
+            existing_domain.paths.add(path)
+            return slop_store.put(existing_domain)
+        } else {
+            // create a domain object containing this path
+            const paths_set = new Set()
+            paths_set.add(path)
+            return slop_store.add({domain: domain, paths: paths_set})
+        }
     }
 
-    async get(url: string) {
-        
+    async get(url: URL) {
+        const slop_store = this.slopdb.transaction(SlopStore.slop_objectstore_name, "readonly").objectStore(SlopStore.slop_objectstore_name)
+        return await slop_store.get(url.hostname)
     }
 }