Добавлен coversStorage для хранения coverpage

client/components/Reader/share/coversStorage.js

@@ -0,0 +1,61 @@
+import localForage from 'localforage';
+//import _ from 'lodash';
+import * as utils from '../../../share/utils';
+
+const maxDataSize = 100*1024*1024;
+
+const coversStore = localForage.createInstance({
+    name: 'coversStorage'
+});
+
+class CoversStorage {
+    constructor() {
+    }
+
+    async init() {
+        this.cleanCovers(); //no await
+    }
+
+    async setData(key, data) {
+        await coversStore.setItem(key, {addTime: Date.now(), data});
+    }
+
+    async getData(key) {
+        const item = await coversStore.getItem(key);
+        return (item ? item.data : undefined);
+    }
+
+    async removeData(key) {
+        await coversStore.removeItem(key);
+    }
+
+    async cleanCovers() {
+        await utils.sleep(10000);
+
+        while (1) {// eslint-disable-line no-constant-condition
+            let size = 0;
+            let min = Date.now();
+            let toDel = null;
+            for (const key of (await coversStore.keys())) {
+                const item = await coversStore.getItem(key);
+
+                size += item.data.length;
+
+                if (item.addTime < min) {
+                    toDel = key;
+                    min = item.addTime;
+                }
+            }
+
+
+            if (size > maxDataSize && toDel) {
+                await this.removeData(toDel);
+            } else {
+                break;
+            }
+        }
+    }
+
+}
+
+export default new CoversStorage();