Django Rest Framework and Polls App presentation and code.
Download Presentation from google docs
Download code from GitHub
Download Presentation from google docs
Download code from GitHub
Sunday, February 2, 2020
Sunday, December 1, 2019
Workspace !!
It took me one day to paint the wall and arrange the workspace.
And the Gang goes here...
Groot, Batman, Meowth, Croc, Dino, Alexa, and Buddha.
Re-arrangement...
And the Gang goes here...
Groot, Batman, Meowth, Croc, Dino, Alexa, and Buddha.
Re-arrangement...
Monday, July 22, 2019
Half Century with Github Repository.
Today I created my 50th repository named as ArtSeptor.
Working on project structure so that everything will be organized. Maybe in 2-3 days, I'll push the codebase.
Working on project structure so that everything will be organized. Maybe in 2-3 days, I'll push the codebase.
Sunday, July 21, 2019
Working on community driven Online E-Commerce Portal!
Why community-driven?
I feel community-driven business is really good to start with where you don't have to worry about building an in-house team of experts. It is like outsourcing someone to do the work and give them loyalty. Building a kind of online artist community, sell their arts and give them loyalty.
What is the name?
ArtSeptor: A community for artist
The name came after Loki's Septor. Technology Stack
Python/Django and there is a really very good eCommerce package written in Python/Django called Django-Shuup! It's quite active in terms of development and I've already tested the feature and I feel it's easy to set up and ready to use.
Launch Date and Hiring Developer
Open to talk to contributors and YES, we are about to launch the portal in October 2019.Contributors can only join if the idea excites you!
Generate wildcard certificate with Let's Encrypt/Certbot and install on GoDaddy, cPanel.
Why there is a need for an SSL certificate?
SSL is the backbone of our secure Internet and it protects your sensitive information as it travels across the world's computer networks. The primary reason why SSL is used is to keep sensitive information sent across the Internet encrypted so that only the intended recipient can access it.If you don't have SSL then google-chrome or any browser will flag your website as Not-Secure which means, if you do any kind of transaction then there is a high chance that your data will be compromised.
In this blog, I'm going to generate one wild-card certificate for my blog site, ashishtiwari.me. A WildCard certificate can be used with subdomain as well, for example -
blog.ashishtiwari.me, contact.ashishtiwari.me, tech.ashishtiwari.me
1. Set up your machine to generate the SSL certificate [ Ubuntu ].
apt-get update
apt-get install git-core2. Install Let's Encrypt/Certbot
apt-get install letsencrypt3. Generate SSL certificate using Certbot
Now with the help of Certbot, we will generate wildcard certificate for our test domain ashishtiwari.me
certbot certonly --manual --preferred-challenges=dns --email writetoashishtiwari@gmail.com
--server https://acme-v02.api.letsencrypt.org/directory --agree-tos -d *.ashishtiwari.me4. Setup DNS TXT record to authenticate Ownership.
For wildcard certificates, the only challenge method Let’s Encrypt accepts is the DNS challenge, which we can invoke via the preferred-challenges=dns flag.
After executing the above command, the Certbot will share a text record to add to your DNS TXT field.
Please deploy a DNS TXT record under the name
_acme-challenge.ashishtiwari.me with the following value:
iroa8XXXhpTah-h4Az4UZuuXslHCdkxIuDiL2XXXv2Y
Create TXT record via DNS console and setup key and value
TXT Record Name : _acme-challenge
TXT Record Value : iroa8XXXhpTah-h4Az4UZuuXslHCdkxIuDiL2XXXv2Y4. Finally, Generate the Certificate.
Once you authenticate the domain ownership; by setting up DNS TXT record, Certbot generates the ssl certificate and required keys [ PEM/CERTIFICATE ].
5. Complete Logs.
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/ashishtiwari.me/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/ashishtiwari.me/privkey.pem
Your cert will expire on 2019-10-14. To obtain a new or tweaked
version of this certificate in the future, simply run certbot
again. To non-interactively renew *all* of your certificates, run
"certbot renew"
- If you like Certbot, please consider supporting our work by:
Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate
Donating to EFF: https://eff.org/donate-le
5. Complete Logs.
Plugins selected: Authenticator manual, Installer None
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for ashishtiwari.me
dns-01 challenge for ashishtiwari.me
-------------------------------------------------------------------------------
Please deploy a DNS TXT record under the name
_acme-challenge.ashishtiwari.me with the following value:
iroa8XXXhpTah-h4Az4UZuuXslHCdkxIuDiL2XXXv2Y
Before continuing, verify the record is deployed.
-------------------------------------------------------------------------------
Press Enter to Continue
-------------------------------------------------------------------------------
Please deploy a DNS TXT record under the name
_acme-challenge.ashishtiwari.me with the following value:
V781k3nW6GaSdpyfbTYJBJpt1IJYBehMQa1je2gFg3Q
Before continuing, verify the record is deployed.
-------------------------------------------------------------------------------
Press Enter to Continue
Waiting for verification...
Cleaning up challenges
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/ashishtiwari.me/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/ashishtiwari.me/privkey.pem
Your cert will expire on 2019-10-14. To obtain a new or tweaked
version of this certificate in the future, simply run certbot
again. To non-interactively renew *all* of your certificates, run
"certbot renew"
- If you like Certbot, please consider supporting our work by:
Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate
Donating to EFF: https://eff.org/donate-le
6. Install SSL on cPanel.
Wednesday, April 17, 2019
Flask Minimal Setup and Hello World with NGROK
Setup VirtualEnv, Flask Installation and Project Directory
pip3 install virtualenvvirtualenv -p /usr/bin/python3 flask-samplesource flask-sample/bin/activatepip install flaskmkdir flask-demo && cd flask-demotouch main.py
Edit main.py file
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello():
return "Hello World!"
if __name__ == '__main__':
app.run()
Run Flask app and visit localhost:5000
python main.pyConsole Log * Serving Flask app "main" (lazy loading) * Environment: production WARNING: Do not use the development server in a production environment. Use a production WSGI server instead. * Debug mode: off * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
NGROK Setup
Signup for NGROK and get AuthToken
Console Logwget https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zipunzip ngrok-stable-linux-amd64.zip./ngrok authtoken./ngrok http 5000
ngrok by @inconshreveable (Ctrl+C to quit)
Session Status online
Account Ashish Tiwari (Plan: Free)
Version 2.3.25
Region United States (us)
Web Interface http://127.0.0.1:4040
Forwarding http://b6ad4280.ngrok.io -> http://localhost:5000
Forwarding https://b6ad4280.ngrok.io -> http://localhost:5000
Connections ttl opn rt1 rt5 p50 p90
0 0 0.00 0.00 0.00 0.00
Tuesday, March 5, 2019
Believe in yourself :Photography In Layman's Voice
First of all, I'm not a professional photographer but I know a few tricks. :)
So, this post is not for professional photographers who have already mastered their camera features.
Let's Start.
Believe In Your Skills.
If you are just starting the Photography Walk then I'm sure you already have an account on Instagram.
If you go through your photographs on Instagram you will see the pattern, the trail of your Photography journey and believe me you are clicking really awesome shots.
Just go through your Instagram feed from the beginning. I knew it! You loved your photographs.
You can learn more about this from Photography Presentation
My Journey as The_Travelling_Monk
“Your first 10,000 photographs are your worst.”
- Henri Cartier-Bresson
Read More About Henri At : https://en.wikipedia.org/wiki/Henri_Cartier-Bresson
Monday, March 4, 2019
Flower Collection ( Bokeh Effect )
Various Types of Flower from different different locations
Sunflower
Genda Phool ( Marigold )
MatchStick Flower
Pink Rose
Sunday, February 24, 2019
Fuzzy Django Flask App : Django Like Project Structure
While I was going through some legacy system which had 75,000 lines of code written in python/flask. I was wondering why it's not borken up into applications.
After discussion with other developers I came to know about that those codes were written by ex-developers 2 yrs back.
It seems those legends only knew about hello-world-in-flask from documentation because everything is written in myflaskapplication.py file ( 75,000 lines ).
Because, models, controller, blueprints, admin, forms and etc etc were written in myflaskapplication.py file.
Now big pain is to break this system into small application and then into microservices.
Since I've spend so much time working with python/django it wasn't difficult to break system's structure into small application and divide task between other developers.
Sample app can be found at, https://github.com/codetarsier/fuzzy-django-flask
Here is the sample structure.
Project Folders
- common : models and serializer for other application
- <application_structure> : contains, models, views, helpers, serializer, urls and views.
- static : contains all css, js, images
- templates : contains html files and broken into application structure like, templates/portal_setup and templates/common
- config : database, packages, secret settings
Project Structure
├── common
│ ├── __init__.py
│ ├── models.py
│ └── serializers.py
├── config
│ ├── constants.py
│ ├── __init__.py
│ ├── sample_secrets.json
│ └── settings.py
├── config.py
├── manage.py
├── portal_setup
│ ├── admin.py
│ ├── forms.py
│ ├── helpers.py
│ ├── __init__.py
│ ├── models.py
│ ├── serializers.py
│ ├── urls.py
│ └── views.py
├── README.md
├── reports.json
├── requirements.txt
├── static
│ └── portal_setup
│ ├── css
│ └── js
└── templates
└── portal_setup
├── add_portal.html
├── base.html
├── edit_portal.html
├── index.html
└── portal_details.html
Monday, December 31, 2018
Flask Assignment and Solution for Health On Demand.
Interview At Health On Demand :
After Puzzle and Face to Face round I got an assignment to build in Python-Flask in a week. I Haven't touched flask in 4 yrs and that is why it was quite challenging but I did it.
Flask usually doesn't have any project structure like Django or Pyramid.
Flask usually doesn't have any project structure like Django or Pyramid.
I got selected and this task helped me a lot to convert HODs Monolith code base into micro-services.
Problem Statement :
A fictitious health-care startup that does health checks for multiple connected instruments. The instruments currently save results via mobile client when all check-ups are done, it does the bulk upload reports.
The organization is having trouble with querying it's a single source of truth database ( PostgreSQL) and need to transforming and migrating user reports data to separate database ( NoSQL ) on a periodic basis to store and serve user report data via the mobile client.
The project contains two services along with documentation,
MyHealthApp: to collect reports from doctors and machine
ReportsApp: for clients to browse the reports.
Additional Task
- Write Test Case
- REST-API testing with Postman
- API Documentation
Details and Code can be found at Github https://github.com/codetarsier/MyHealthApp/
Solution Goes Here
Reading Material
ClassBasedViews: http://flask.pocoo.org/docs/0.12/views/#method-views-for-apis
Flask Blueprint: https://exploreflask.com/en/latest/blueprints.html
ClassBasedViews: http://flask.pocoo.org/docs/0.12/views/#method-views-for-apis
Flask Blueprint: https://exploreflask.com/en/latest/blueprints.html
System Workflow
- User comes for a health checkup
- With HealthCheckup Machine doctor does the health checkup and machine stores all these reports in its local memory.
- MyHealthCheckupApp mobile/tab application pulls those reports from HC-Machine.
- MyHealthCheckupApp sends all the reports to MyHealthApp-API backend server.
- TaskRunner runs a background task and keeps checking for the new record on some interval ( Interval Time can be set in the settings file ). TaskRunner fetches the record and stores last checkup-reportID and when next time it runs, it fetches the incremental reports from previously-stored checkup-reportID.
- TaskRunner converts these reports into JSON then it sends them to ReportsApp-Server using ReportsAPI.
- Client/Customer login into ReportsApp mobile application and browse those reports from ReportsApp-API backend server.
- When the client provides username/password it gets authenticated from MyHealthApp-API.
- After authentication users can browse Reports.
Project Structure of 1. My Health App
Project Structure of 2. Reports App
Thanks.
├── LICENSE
├── README.md
├── docs
│ ├── postman-api-collections
│ └── postman-api-docs
├── myhealthapp
│ ├── applications
│ │ ├── __init__.py
│ │ ├── checkups
│ │ │ ├── __init__.py
│ │ │ ├── models.py
│ │ │ └── views.py
│ │ ├── common
│ │ │ ├── __init__.py
│ │ │ └── models.py
│ │ ├── machines
│ │ │ ├── __init__.py
│ │ │ ├── models.py
│ │ │ └── views.py
│ │ └── profiles
│ │ ├── __init__.py
│ │ ├── models.py
│ │ └── views.py
│ ├── config
│ │ ├── __init__.py
│ │ ├── development_sqlite.db
│ │ ├── secrets.json
│ │ └── settings.py
│ ├── manage.py
│ ├── migrations
│ │ ├── README
│ │ ├── alembic.ini
│ │ ├── env.py
│ │ ├── script.py.mako
│ │ └── versions
│ │ ├── 4cecc0d2ed8a_.py
│ │ └── cc805ab1bc28_.py
│ └── tests
│ ├── __init__.py
│ └── test_flaskr.py
└── requirements.txtProject Structure of 2. Reports App
├── README.md
├── config
│ ├── __init__.py
│ ├── __pycache__
│ ├── secrets.json
│ └── settings.py
├── docs
│ └── ReportsAPIs.postman_collection.json
├── manage.py
├── reports
│ ├── __pycache__
│ ├── managers.py
│ ├── models.py
│ └── views.py
├── requirements.txt
├── tests
│ ├── __init__.py
│ ├── __pycache__
│ ├── conftest.py
│ ├── flask_test.cfg
│ └── test_user_reports.py
└── utils
├── __pycache__
├── random_hex.py
├── response_handler.py
└── rest_auth.pyThanks.
Wednesday, December 5, 2018
Tuesday, December 4, 2018
Rancho, observing everyone to snatch their food.
Rancho,
He is observing everyone to snatch their food. :P
Found him on indore trip.
He is observing everyone to snatch their food. :P
Found him on indore trip.
Monday, November 19, 2018
Working with Multiple Databases in Django.
Working with Multiple Databases in Django.
As usual django-doc is great to start with any topics. I was just giving a try to use multiple database in single application.1. Database Settings
First step is to tell your django application that you want to use more than one database. So look for the DATABASES in your project's settings.py file.project/settings.py
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
},
'blogs': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': os.path.join(BASE_DIR, 'blogs_db.sqlite3')
}
}
2. Define Model
blogs/models.py
from django.db import models
class Blog(models.Model):
title = models.CharField(max_length=200)
3. Setup Database Router
You can define a database router that implements a policy constraining the availability of particular models.project/settings.py
DATABASE_ROUTERS = ['blogs.router.BlogRouter']
blogs/router.py
class BlogRouter:
"""
A router to control all database operations on models in the
auth application.
"""
def db_for_read(self, model, **hints):
"""
Attempts to read auth models go to auth_db.
"""
if model._meta.app_label == 'blogs':
return 'blogs'
return None
def db_for_write(self, model, **hints):
"""
Attempts to write auth models go to auth_db.
"""
if model._meta.app_label == 'blogs':
return 'blogs'
return None
def allow_relation(self, obj1, obj2, **hints):
"""
Allow relations if a model in the auth app is involved.
"""
if obj1._meta.app_label == 'blogs' or \
obj2._meta.app_label == 'blogs':
return True
return None
def allow_migrate(self, db, app_label, model_name=None, **hints):
"""
Make sure the auth app only appears in the 'auth_db'
database.
"""
if app_label == 'blogs':
return db == 'blogs'
return None
./manage.py makemigrations --database=default
./manage.py makemigrations --database=blogs
4. Create Blog
There are multiple ways to create blog entry in blogs_db,4.1. By using "using(
example,
from blogs.models import Blog
Blog.objects.using('blogs').create(title='python goes here')
4.2. Create a blog through admin interface.
blogs/admin.py
from django.contrib import admin
from .models import Blog
admin.site.register(Blog)
5. Test Your Config Using Shell
Create a blog entry using the admin site and will check which database has stored the blog info../manage.py shell
from blogs.models import Blog
# This will run on the DEFAULT-DATABASE/BLOG-DATABASE
Blog.objects.all()
QuerySet [Blog: Blog object (1)]
# This will run on the BLOGS-DATABASE
Blog.objects.using('blogs').all()
QuerySet [Blog: Blog object (1)]
# returns blogs
#This will run on the DEFAULT-DATABASE
Blog.objects.using('default').all()
301 return Database.Cursor.execute(self, query)
302 query = self.convert_query(query)
--> 303 return Database.Cursor.execute(self, query, params)
304
305 def executemany(self, query, param_list):
OperationalError: no such table: blogs_blog
returns error.
Sunday, August 12, 2018
Beauty of Gateway Of India and Tajmahal Palace Hotel
The Taj Mahal Palace Hotel
The Taj Mahal Palace Hotel is a heritage, five-star luxury hotel in the Colaba region of Mumbai, Maharashtra, India, situated next to the Gateway of India. Historically it was known as the "Taj Mahal Hotel" or the "Taj Palace Hotel" or simply "the Taj".The Gateway of India
The Gateway of India is an arch monument built during the 20th century in Bombay, India. The monument was erected to commemorate the landing of King George V and Queen Mary at Apollo Bunder on their visit to India in 1911.
Thursday, August 2, 2018
Python Selenium : Generating the HTML Test Report and Screenshot feature.
Python Selenium : HtmlTestRunner and Screenshot feature.
Introduction
HtmlTest runner
HtmlTest runner is a unittest test runner that save test results in Html files, for human readable presentation of results.Screenshots
In automation, it is mandatory to take the screenshot for verification so that can prove also that your test case has covered certain functionality or not. Screenshots help you a lot when your test case will fail so that you can identify what went wrong in your script or in your application.1. HtmlTestRunner Installation
You can install and read more about HtmlTestRunner from the Github..HtmlTestRunner Github Page
Using pip, you can install selenium like this:
pip install html-testRunner2. Sample Selenium Test
create pythonorg-sample.py
import unittest
import HtmlTestRunner
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
class PythonOrgSearch(unittest.TestCase):
def setUp(self):
self.driver = webdriver.Chrome()
def test_search_in_python_org(self):
driver = self.driver
driver.get("http://www.python.org")
# take screen shot
self.driver.save_screenshot("python-org.png")
elem = driver.find_element_by_name("q")
elem.send_keys("pycon")
elem.send_keys(Keys.RETURN)
# take screen shot after search
self.driver.save_screenshot("python-org-after-search.png")
assert "No results found." not in driver.page_source
def test_error(self):
""" This test should be marked as error one. """
raise ValueError
def test_fail(self):
""" This test should fail. """
self.assertEqual(1, 2)
def tearDown(self):
self.driver.close()
if __name__ == "__main__":
unittest.main(testRunner=HtmlTestRunner.HTMLTestRunner(output='report'))
3. Run Selenium Test
python pythonorg-sample.py4. Screenshots
HtmlTestRunner
Console Log
Running tests...
----------------------------------------------------------------------
This test should be marked as error one. ... ERROR (1.961452)s
This test should fail. ... FAIL (1.838222)s
test_search_in_python_org (__main__.PythonOrgSearch) ... OK (12.246906)s
======================================================================
ERROR [1.961452s]: This test should be marked as error one.
----------------------------------------------------------------------
Traceback (most recent call last):
File "pythonorg-sample.py", line 31, in test_error
raise ValueError
ValueError
======================================================================
FAIL [1.838222s]: This test should fail.
----------------------------------------------------------------------
Traceback (most recent call last):
File "pythonorg-sample.py", line 35, in test_fail
self.assertEqual(1, 2)
AssertionError: 1 != 2
----------------------------------------------------------------------
Ran 3 tests in 0:00:16
FAILED
(Failures=1, Errors=1)
Generating HTML reports...
Wednesday, August 1, 2018
Getting Started with Python Selenium on Mac OS X
1. Introduction
Selenium Python bindings provides a simple API to write functional/acceptance tests using Selenium WebDriver. Through Selenium Python API you can access all functionalities of Selenium WebDriver in an intuitive way. Selenium Python bindings provide a convenient API to access Selenium WebDrivers like Firefox, Ie, Chrome, Remote etc. The current supported Python versions are 2.7, 3.5 and above.2. Downloading Python bindings for Selenium and Installation
You can download Python bindings for Selenium from the PyPI page for selenium package. However, a better approach would be to use pip to install the selenium package. Python 3.6 has pip available in the standard library. Using pip, you can install selenium like this:pip install selenium3. Drivers
Selenium requires a driver to interface with the chosen browser. Firefox, for example, requires geckodriver, which needs to be installed before the below examples can be run. Make sure it’s in your PATH, e. g., place it in /usr/bin or /usr/local/bin.cp chromedriver /usr/local/bin/4. Sample Selenium Test
create main.py file
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
driver = webdriver.Chrome()
driver.get("http://www.python.org")
assert "Python" in driver.title
elem = driver.find_element_by_name("q")
elem.clear()
elem.send_keys("pycon")
elem.send_keys(Keys.RETURN)
assert "No results found." not in driver.page_source
driver.close()
5. Run Script
python main.py