Files
liberama/client/components/Reader/share/bookManager.js
2019-01-26 01:47:11 +07:00

147 lines
3.7 KiB
JavaScript

import localForage from 'localforage';
import * as utils from '../../../share/utils';
import BookParser from './BookParser';
const maxDataSize = 100*1024*1024;//chars, not bytes
const bmMetaStore = localForage.createInstance({
name: 'bmMetaStore'
});
const bmDataStore = localForage.createInstance({
name: 'bmDataStore'
});
class BookManager {
async init() {
this.books = {};
const len = await bmMetaStore.length();
for (let i = 0; i < len; i++) {
const key = await bmMetaStore.key(i);
const keySplit = key.split('-');
if (keySplit.length == 2 && keySplit[0] == 'bmMeta') {
let meta = await bmMetaStore.getItem(key);
this.books[meta.key] = meta;
}
}
await this.cleanBooks();
}
async cleanBooks() {
while (1) {// eslint-disable-line no-constant-condition
let size = 0;
let min = Date.now();
let toDel = null;
for (let key in this.books) {
let book = this.books[key];
size += (book.length ? book.length : 0);
if (book.addTime < min) {
toDel = book;
min = book.addTime;
}
}
if (size > maxDataSize && toDel) {
await this.delBook(toDel);
} else {
break;
}
}
}
async addBook(newBook, callback) {
if (!this.books)
await this.init();
let meta = {url: newBook.url, path: newBook.path};
meta.key = this.keyFromUrl(meta.url);
meta.addTime = Date.now();
const result = await this.parseBook(meta, newBook.data, callback);
this.books[meta.key] = result;
await bmMetaStore.setItem(`bmMeta-${meta.key}`, this.metaOnly(result));
await bmDataStore.setItem(`bmData-${meta.key}`, result.data);
return result;
}
hasBookParsed(meta) {
if (!this.books)
return false;
if (!meta.url)
return false;
if (!meta.key)
meta.key = this.keyFromUrl(meta.url);
let book = this.books[meta.key];
return (book && book.parsed);
}
async getBook(meta, callback) {
if (!this.books)
await this.init();
let result = undefined;
if (!meta.key)
meta.key = this.keyFromUrl(meta.url);
result = this.books[meta.key];
if (result && !result.data) {
result.data = await bmDataStore.getItem(`bmData-${meta.key}`);
this.books[meta.key] = result;
}
if (result && !result.parsed) {
result = await this.parseBook(result, result.data, callback);
this.books[meta.key] = result;
}
return result;
}
async delBook(meta) {
if (!this.books)
await this.init();
await bmMetaStore.removeItem(`bmMeta-${meta.key}`);
await bmDataStore.removeItem(`bmData-${meta.key}`);
delete this.books[meta.key];
}
async parseBook(meta, data, callback) {
if (!this.books)
await this.init();
const parsed = new BookParser();
const parsedMeta = await parsed.parse(data, callback);
const result = Object.assign({}, meta, parsedMeta, {
length: data.length,
textLength: parsed.textLength,
data,
parsed
});
return result;
}
metaOnly(book) {
let result = Object.assign({}, book);
delete result.data;
delete result.parsed;
return result;
}
keyFromUrl(url) {
return utils.stringToHex(url);
}
}
export default new BookManager();