node.js - Strongloop file upload - conflicting containers during simultaneous uploads -

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i'm developing application on strongloop has multiple image uploads. i'm using loopback component-storage uploading files using rest api.

the containers dynamic (client app sends unique container ids) , i'm creating folder container within 'beforeremote' using container id. have application logic inside 'afterremote'.

recently faced strange issue image uploading under 1 container gets overridden image upload happens under different container id. rare issue came across twice.

beforeremote method:

mymodel.beforeremote('upload', function (ctx, res, callback) {     var arrstr = ctx.req.url.split(/[//]/);     var mkdirp = require('mkdirp');     var path = '../storage/images/' + arrstr[1];  //arrstr[1] container folder     mkdirp(path, function (err) {         console.log(err);     });      callback(); });

afterremote method:

mymodel.afterremote('upload', function (ctx, res, callback) {       var mainlogics = function(){            var file = res.result.files.file[0];            if (file != undefined) {               if (file != null) {                      var mydata = res.result.fields.data[0];                      if (mydata != undefined) {                            //my application logic                            callback();                       }                       else                           callback();                }                else                    callback();              }           }           mainlogics();          });

the conflict of images occurred during sequence of steps. images more 500 kb in size , image set contains 2 images.

  1. clienta starts upload of image set -1 (upload a1)
  2. clientb starts upload of image set -1 (upload b1)
  3. clienta starts upload of image set -2 (upload a2)
  4. b1 upload finish - images saved correctly
  5. a2 upload finish - 1 of images missing
  6. a1 upload finish - one image overridden 1 image of b1 , partly saved in disk.

note: client having poor internet connectivity , client b having moderate level of internet connectivity.

i re-checked ids sent client , unique. tried re-create following same steps above failed.

i'm wondering how images got overridden other uploads when uploading happens in parallel. i'm new strongloop , appreciate if give me clue on cause of problem.

here versions:

  • nodejs : 6.0.0
  • loopback : 2.18.0
  • loopback-component-storage : 1.4.0


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