Работа над api reader, worker

server/core/ReaderWorker.js

@@ -0,0 +1,46 @@
+const workerState = require('./workerState');
+const utils = require('./utils');
+
+const fs = require('fs-extra');
+const util = require('util');
+const stream = require('stream');
+const pipeline = util.promisify(stream.pipeline);
+const download = require('download');
+
+class ReaderWorker {
+    constructor(config) {
+        this.config = config;
+        this.tempDownloadDir = `${config.tempDir}/download`;
+        fs.ensureDirSync(this.tempDownloadDir);
+    }
+
+    async loadBook(wState, url) {
+        try {
+            wState.set({state: 'download', step: 1, totalSteps: 3, url});
+
+            const tempFilename = utils.randomHexString(30);
+            const d = download(url);
+            d.on('downloadProgress', progress => {
+                wState.set({progress:  Math.round(progress.percent*100)});
+            })
+
+            await pipeline(d, fs.createWriteStream(`${this.tempDownloadDir}/${tempFilename}`));
+            
+            wState.finish({step: 3, file: tempFilename});
+        } catch (e) {
+            wState.set({state: 'error', error: e.message});
+        }
+    }
+
+    loadBookUrl(url) {
+        const workerId = workerState.generateWorkerId();
+        const wState = workerState.getControl(workerId);
+        wState.set({state: 'start'});
+
+        this.loadBook(wState, url);
+
+        return workerId;
+    }
+}
+
+module.exports = ReaderWorker;