To manage and collaborate the API documentations of a large project, we follow the below steps Write details of each endpoints in a separate yaml files. Write each models in separate yaml files so that we can reuse it. Combine all the yaml files using `swagger-cli` Serve the swagger doc…

Scenario — Our application has a different authentication mechanism for login. Google, Facebook, custom login etc. Customers upload images after login Storing images in Amazon S3 Generating thumbnails for each images to use in the list view Traditional way This approach has some drawbacks Bandwidth usage of application server — Since we upload the…

How to find the difference between 2 dates, which are in string format ? The solution was very simple, after execution of below code snippet we will get the required result in the variable dates tm start_parsed = {}; strptime("2020-01-21 05:00", "%Y-%m-%d %H:%M", &start_parsed) tm end_parsed = {}; strptime("2038-12-23 05:00", "%Y-%m-%d %H:%M", &end_parsed) time_t…

First, you need to download the key json file into your computer from google cloud console. One simple solution is to export the absolute path of key json file as below export GOOGLE_APPLICATION_CREDENTIALS=absolute/path/of/key.json If you are not satisfied with the above solutions, then do it programmatically from java. …

Checkout the project from github and start using it, if you are familiar with DialogFlow. Create a GCM Project in google console. Go to google console dashboard and create a new Project. I created a project with name `Dialogflow-Test`

Let us create a multiple database application (multi tenant application) Problem : Create an application to manage schools and colleges. Each school/college data should save in separate database. Also students in each years should save in separate collections. I solved these problem by using `mongoose.connection.useDb` …

To communicate between python and C, we have a library `ctypes` Step — 1 : create a c program, in which one function receives another function pointer as parameter. In the below example, the function divide receives another function pointer as first parameter, which receives 2 parameters, quotient and remainder. …

If your csv files are very large say more than 100MB, then it would be very difficult to concatenate the csv files using conventional methods. In Python we can use the library shutil to concatenate multiple large csv files into a single csv file. Sample code is import shutil csv_files =…

Install VLC player in your android device (I used amazone firetv stick) Start VLC activity from your android application as follows Intent i = new Intent(Intent.ACTION_MAIN); i.setComponent(new ComponentName("org.videolan.vlc", "org.videolan.vlc.gui.video.VideoPlayerActivity")); String url = 'Your youtube url'; i.putExtra("url", url); i.setDataAndType(Uri.parse(url), "video/*"); context.startActivity(i);