Наладил сжатие файлов книг в /tmp

server/core/FileDecompressor.js

@@ -1,3 +1,6 @@
+const fs = require('fs-extra');
+const zlib = require('zlib');
+const crypto = require('crypto');
 const decompress = require('decompress');
 const FileDetector = require('./FileDetector');
 
@@ -28,6 +31,29 @@ class FileDecompressor {
 
         return result;
     }
+
+    async gzipBuffer(buf) {
+        return new Promise((resolve, reject) => {
+            zlib.gzip(buf, {level: 1}, (err, result) => {
+                if (err) reject(err);
+                resolve(result);
+            });
+        });
+    }
+
+    async gzipFileIfNotExists(filename, outDir) {
+        const buf = await fs.readFile(filename);
+
+        const hash = crypto.createHash('sha256').update(buf).digest('hex');
+
+        const outFilename = `${outDir}/${hash}`;
+
+        if (!await fs.pathExists(outFilename)) {
+            await fs.writeFile(outFilename, await this.gzipBuffer(buf))
+        }
+
+        return outFilename;
+    }
 }
 
 module.exports = FileDecompressor;