perform actions on filestream close

Author: vedharish

lib/LocalBinary.js

@@ -28,7 +28,7 @@ function LocalBinary(){
 
     var destBinaryName = (this.windows) ? 'BrowserStackLocal.exe' : 'BrowserStackLocal';
     var binaryPath = path.join(destParentDir, destBinaryName);
-    var file = fs.createWriteStream(binaryPath);
+    var fileStream = fs.createWriteStream(binaryPath);
 
     var options = url.parse(this.httpPath);
     if(conf.proxyHost && conf.proxyPort){
@@ -39,12 +39,15 @@ function LocalBinary(){
     }
 
     https.get(options, function (response) {
-      response.on('end', function () {
+      response.pipe(fileStream);
+      fileStream.on('error', function (err) {
+        console.error('Got Error while downloading binary file', err);
+      });
+      fileStream.on('close', function () {
         fs.chmod(binaryPath, '0755', function() {
           callback(binaryPath);
         });
       });
-      response.pipe(file);
     });
   };