Node.js ncp | fs.readdir | недостающие файлы | использование обратного вызова

• ПОДСКАЗКА 1:

  Check the order reported on your fs.readdir

• ПОДСКАЗКА 2:

  Now, as it´s alphabetical order, look for the next ocurrence in your list (alphabetically)

• ПОДСКАЗКА 3:

  Check for special characters on it´s name.

• ПОДСКАЗКА 4 - ПРОВЕРЬТЕ ВОЗМОЖНОЕ РЕШЕНИЕ *

  As you can see, there is a space on the name of `new dictionary.json". Remove the spaces on this name and try again.

• ПОДСКАЗКА 5 - Измените свой звонок и добавьте StopOnError

Add an StopOnError option to show if it stops there and why

ncp ( 
  path.join(req.body.uploadPath, req.body.packageName,   resourceDirectoryName),
  path.join(req.body.uploadPath,req.body.packageName), 
  {stopOnErr: true},
  (err) => {
        if (err) 
        {
          return console.error(err);
        }
      console.info("ok");
   }
)

РЕШЕНИЕ

After dealing with this for a little of time, the problem was located: The user was executing the fs.readdir right after the execution of NCP. As NCP is asyncronous, fs.readdir was not reading the whole bunch of copied files, as they were still not copied.

Then, just a delay before fs.readdir was the solution to see all of them. Not a Spaces or special characters thing.

НАКОНЕЦ РЕАЛЬНОЕ РЕШЕНИЕ

As async programming has a first-day-of-school where everybody learns how to deal with callbacks, there is an example to deal with callbacks, and solve the question.

var ncp = require('ncp').ncp;
var fs = require('fs');


ncp.limit = 16;
var source = "dir1"
var destination = "dir2"
console.info('Starting');
console.info(new Date().toISOString());

ncp(source, destination, mycallback );

function mycallback(err)
{
 //here we are inside a callback declared in an outer function
 if (err) {
   return console.info(err);
 }
 console.info('done!');
 console.info(new Date().toISOString());
 fs.readdir(destination, function (err, files){
            console.info("Files Copied to Dir2 "+ files.length);
            //here we are inside fs.readdir callback
            copyTwo();
              });
 //as fs.readdir is also async, I cannot execute copyTwo() here, and I must execute inside fs.reddir callback
}


function copyTwo()
{
console.info('Starting CopyTwo');
console.info(new Date().toISOString());
source = "dir2"
destination = "dir3"
  //This function uses an embedded callback
  ncp(source, destination, function (err)
  {
   // here we are inside the function declared (with-no-name) to use directly asembedded  callback
   if (err) {
     return console.info(err);
   }
   console.info('done!');
   console.info(new Date().toISOString());
   fs.readdir(destination, function (err, files){
              console.info("Files Copied to Dir3 "+ files.length);
                });
  });
}




[admin-sp@localhost pruebaApp]$ ls dir1 | wc -l
7777
[admin-sp@localhost pruebaApp]$ ls dir2 | wc -l
0
[admin-sp@localhost pruebaApp]$ ls dir3 | wc -l
0
[admin-sp@localhost pruebaApp]$ node index.js
Starting
2018-05-01T00:55:50.683Z
done!
2018-05-01T00:55:57.063Z
Files Copied to Dir2 7777
Starting CopyTwo
2018-05-01T00:55:57.069Z
done!
2018-05-01T00:56:03.030Z
Files Copied to Dir3 7777
[admin-sp@localhost pruebaApp]$