akanshgulati ( Akansh Gulati )

Akansh Gulati akanshgulati @ixigo, Ex @wingify India https://www.akansh.com Open Source Language Leader @duckduckgo and front-end artisan.

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akanshgulati/commit-semantics 37

Commit semantics is a git aliases installation script to follow a fix format for commits

akanshgulati/covid19-tracker-extension 4

A popup extension to get latest statistics on COVID-19 infected cases globally

akanshgulati/are 2

Library for type checking elements of array

akanshgulati/akanshgulati.github.io 1

akanshgulati/bk-murli-alexa-skill 1

Alexa audio skill to play brahma kumari murli

akanshgulati/duckduckgo-locales 1

Translation files for duckduckgo.com

akanshgulati/Access-Control-Allow-Origin 0

Chrome extension: https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi

akanshgulati/akansh.com 0

akanshgulati/angular 0

One framework. Mobile & desktop.

akanshgulati/api 0

Our Database

issue commentlykmapipo/mongoose-gridfs

Write Callback not giving a error or success state

@jakesjews No problem. I tagged you assuming you contributing in core part of package. cc: @lykmapipo

akanshgulati

comment created time in 3 days

issue openedlykmapipo/mongoose-gridfs

Write Callback not giving a error or success state

I am using a CRON job to fetch 50MB around data from remote server and writing that data to MongoDB server.

The issue with current code is that the console.log('data stream formed'); is executed in writeLargeData method, data is being added to mongo DB server but data added successfully is not coming in logs and due to this the parent promise is never resolved. Could you please suggest what's being done wrong.

const { createModel } = require('mongoose-gridfs');
const mongoose = require('mongoose');
const connection = mongoose.connection;
const Readable = require('stream').Readable;
const cron = require('node-cron');
const axios = require('axios');

const ExampleModel = createModel({
  modelName: 'fs',
  connection: connection,
});

async function addDataToMongo(dataStream) {
  const options = ({filename: 'data.txt', contentType: 'text/plain'});
  return new Promise((res, rej)=>{
    ExampleModel.write(options, dataStream, (error, file) => {
      if (error) {
        console.log('error', error);
        rej(error);
        return;
      }
      res(file._id.toString());
      console.log('data added successfully' + file._id.toString());
    });
  });
}

function getReadableStreamFromString(string) {
  let count = 0;
  const chunkSize = 10000;
  return new Readable({
    read() {
      if (count < string.length) {
        this.push(string.slice(count, count + chunkSize));
        count += chunkSize;
      } else {
        this.push(null);
      }
    }
  });
}

async function writeLargeData() {
  const response = await axios.request({
    url: 'https://abc.com',
    method: 'GET',
  });
  console.log('response fetched');
  const dataStream = getReadableStreamFromString(response);
  console.log('data stream formed');
  await addDataToMongo(dataStream);
    
}

cron.schedule('30 12,18,22 * * *', writeLargeData);

@jakesjews Please suggest what should be done in this case.

created time in 4 days

issue commentlykmapipo/mongoose-gridfs

write() callback not working, and connection not closing

@vrmerlin I think you have used await in a wrong way here as when the write process is called it will call callback method and not a promise getting resolved.

You can wrap this login inside a promise to make this work.

vrmerlin