Работа над MegaStorage

server/core/ZipStreamer.js

@@ -0,0 +1,59 @@
+const fs = require('fs-extra');
+const path = require('path');
+
+const zipStream = require('zip-stream');
+const unzipStream = require('node-stream-zip');
+
+class ZipStreamer {
+    constructor() {
+    }
+
+    //TODO: сделать рекурсивный обход директорий, пока только файлы
+    //files = ['filename', 'dirname/']
+    pack(zipFile, files, options, entryCallback) {
+        return new Promise((resolve, reject) => { (async() => {
+            entryCallback = (entryCallback ? entryCallback : () => {});
+            const zip = new zipStream(options);
+
+            const outputStream = fs.createWriteStream(zipFile);
+
+            outputStream.on('error', reject);
+            outputStream.on('finish', async() => {
+                let file = {path: zipFile};
+                try {
+                    file.size = (await fs.stat(zipFile)).size;
+                } catch (e) {
+                    reject(e);
+                }
+                resolve(file);
+            });            
+
+            zip.on('error', reject);
+            zip.pipe(outputStream);
+
+            const zipAddEntry = (filename) => {
+                return new Promise((resolve, reject) => {
+                    const basename = path.basename(filename);
+                    const source = fs.createReadStream(filename);
+
+                    zip.entry(source, {name: basename}, (err, entry) => {
+                        if (err) reject(err);
+                        resolve(entry);
+                    });
+                });
+            };
+
+            for (const filename of files) {
+                const entry = await zipAddEntry(filename);
+                entryCallback({path: entry.name, size: entry.size, compressedSize: entry.csize});
+            }
+
+            zip.finish();
+        })().catch(reject); });
+    }
+
+    unpack(zipFile, entryCallback) {
+    }
+}
+
+module.exports = ZipStreamer;