Подготовка к запуску внешних конвертеров, для обработки файлов pdf, doc, epub, mobi и пр.

server/core/utils.js

@@ -1,3 +1,4 @@
+const { spawn } = require('child_process');
 const fs = require('fs-extra');
 const crypto = require('crypto');
 
@@ -13,8 +14,46 @@ async function touchFile(filename) {
     await fs.utimes(filename, Date.now()/1000, Date.now()/1000);
 }
 
+function spawnProcess(cmd, opts) {
+    let {args, killAfter, onData} = opts;
+    killAfter = (killAfter ? killAfter : 30*1000);
+    onData = (onData ? onData : () => {});
+    args = (args ? args : []);
+
+    return new Promise(async(resolve, reject) => {
+        let resolved = false;
+        const proc = spawn(cmd, args);
+
+        let stdout = '';
+        proc.stdout.on('data', (data) => {
+            stdout += data;
+            onData(data);
+        });
+
+        let stderr = '';
+        proc.stderr.on('data', (data) => {
+            stderr += data;
+            onData(data);
+        });
+
+        proc.on('close', (code) => {
+            resolved = true;
+            resolve({status: 'close', code, stdout, stderr});
+        });
+
+        proc.on('error', (error) => {
+            reject({status: 'error', error, stdout, stderr});
+        });
+
+        await sleep(killAfter);
+        if (!resolved)
+            reject({status: 'killed', stdout, stderr});
+    });
+}
+
 module.exports = {
     sleep,
     randomHexString,
-    touchFile
+    touchFile,
+    spawnProcess
 };