diagnose memory issues logging memwatch diffs and uploading heapdumps to a Box.com folder

memdiag.js

var heapdump = require('heapdump');
var memwatch = require('memwatch');
var fs = require('fs');
var os = require("os");

var hostname = os.hostname();

var rest = require('restler');

var timeoutVal = process.env.DUMP_TIMEOUT_VAL;
var accessToken = process.env.BOX_ACCESS_TOKEN;
var parentId = process.env.BOX_FOLDER_PARENT_ID;

var hd = new memwatch.HeapDiff();
var periodicDump = function () {
    setTimeout(function () {

        var filename = Date.now() + '.heapsnapshot';

        heapdump.writeSnapshot('/tmp/' + filename, function (err) {

            if (err) {
                console.error(err);
                diffAndReschedule()
            } else {

                var filenameWithDirPath = '/tmp/' + filename;
                var stats = fs.statSync(filenameWithDirPath);

                rest.post("https://upload.box.com/api/2.0/files/content", {
                    multipart: true,
                    headers: {Authorization: 'Bearer ' + accessToken},
                    data: {
                        attributes: JSON.stringify({
                            name: hostname + '-' + filename,
                            parent: {id: parentId}
                        }),
                        file: rest.file(filenameWithDirPath, null, stats.size, null, 'image/jpg')
                    }
                }).on("complete", function (data, response) {
                    if (response.statusCode == 201) {
                        console.log('memdiag: uploaded heapdump from ' + filename + ' to box.com');
                    } else {
                        console.log('memdiag: error uploading heapdump to box.com, status code : ' + response.statusCode);
                    }
                    fs.unlink(filenameWithDirPath);
                    diffAndReschedule();
                }).on("error", function (err, response) {
                    console.log('memdiag: error uploading heapdump to box.com : ' + JSON.stringify(error, null, 2));
                    fs.unlink(filenameWithDirPath);
                    diffAndReschedule();
                });

            }

            function diffAndReschedule() {
                var diff = hd.end();
                console.log('memdiag: ' + JSON.stringify(diff, null, 2));

                hd = new memwatch.HeapDiff();
                periodicDump();
            }

        });
    }, timeoutVal);
};

periodicDump();