- Service Worker

- Indexdb

src/statics/js/storage.js

@@ -0,0 +1,91 @@
+let idbKeyval = (() => {
+  let db;
+
+  function getDB() {
+    if (!db) {
+      console.log('CREO DB STATICS!')
+      db = new Promise((resolve, reject) => {
+        const openreq = indexedDB.open('mydb3', 11);
+
+        openreq.onerror = () => {
+          reject(openreq.error);
+        };
+
+        openreq.onupgradeneeded = () => {
+          // First time setup: create an empty object store
+          openreq.result.createObjectStore('todos', { keyPath: '_id' });
+          openreq.result.createObjectStore('sync_todos', { keyPath: '_id' });
+          openreq.result.createObjectStore('delete_todos', { keyPath: '_id' });
+          openreq.result.createObjectStore('config', { keyPath: '_id' });
+        };
+
+        openreq.onsuccess = () => {
+          resolve(openreq.result);
+        };
+      });
+    }
+    return db;
+  }
+
+  async function withStore(type, table, callback, ) {
+    const db = await getDB();
+    return new Promise((resolve, reject) => {
+      const transaction = db.transaction(table, type);
+      transaction.oncomplete = () => resolve();
+      transaction.onerror = () => reject(transaction.error);
+      callback(transaction.objectStore(table));
+    });
+  }
+
+  return {
+    async get(key) {
+      let req;
+      await withStore('readonly', store => {
+        req = store.get(key);
+      });
+      return req.result;
+    },
+    async getalldata(table) {
+      let req;
+      await withStore('readonly', table, store => {
+        req = store.getAll();
+      });
+      return req.result;
+    },
+    set(key, value) {
+      return withStore('readwrite', 'keyval', store => {
+        store.put(value, key);
+      });
+    },
+    setdata(table, value) {
+      return withStore('readwrite', table, store  => {
+        store.put(value);
+      });
+    },
+    delete(key) {
+      return withStore('readwrite', 'keyval', store => {
+        store.delete(key);
+      });
+    },
+    async deletedata(table, key) {
+      return await withStore('readwrite', table, store => {
+        store.delete(key);
+      });
+    },
+    async clearalldata(table) {
+      return await withStore('readwrite', table, store => {
+        store.clear();
+      });
+    }
+  };
+})();
+
+// iOS add-to-homescreen is missing IDB, or at least it used to.
+// I haven't tested this in a while.
+if (!self.indexedDB) {
+  idbKeyval = {
+    get: key => Promise.resolve(localStorage.getItem(key)),
+    set: (key, val) => Promise.resolve(localStorage.setItem(key, val)),
+    delete: key => Promise.resolve(localStorage.removeItem(key))
+  };
+}