1382 lines
49 KiB
Markdown
1382 lines
49 KiB
Markdown
# PyConES17
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 Workshop: Flask-wallapop-watcher (Application to monitor prices in Wallapop)
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 Taller: Flask-wallapop-watcher (Aplicación para vigilar precios en Wallapop)
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## Demo
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 Currently implemented on a real site:
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 Actualmente esta implementado en un sitio real:
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[wallaviso.com](http://wallaviso.com)
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## Run (Ejecutar)
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 For the impatient, you can play with the finished exercise. You should download the code and execute the following commands.
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 Para los impacientes, podéis jugar con el ejercicio acabado. Debéis descargar el código y ejecutar los siguientes comandos.
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```bash
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cd flask-wallapop-watcher
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pip3 install virtualenv
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virtualenv --python=python3 .venv
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source .venv/bin/activate
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pip3 install -r requirements.txt
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python3 models.py db init
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python3 models.py db migrate
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python3 models.py db upgrade
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python3 app.py
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````
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 Then open in your favorite browser, which will possibly be the fantastic Firefox, a new tab with [http://127.0.0.1:5000](http://127.0.0.1:5000)
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 Después abrir en tu navegador favorito, que posiblemente será el fantástico Firefox, una pestaña nueva con [http://127.0.0.1:5000](http://127.0.0.1:5000)
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---
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## Workshop (Taller)
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### Minimum requirements (Requisitos mínimos)
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* python3
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* wget
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* Editor de texto enriquecido: Vim, Sublime Text, VSCode, Atom...
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* sqlite3
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* Conexión a internet
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### We checked everything (Comprobamos que tenemos todo)
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```bash
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python3 --help
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wget --help
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sqlite3 --help
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ping -c 5 google.com
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```
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---
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### Part 1 - Flask Core y Search (Parte 1 - Nucleo de Flask y Buscador) 50 min
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#### 1.1 Ready?
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 We prepare our virtual environment.
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 Preparamos nuestro entorno virtual.
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```bash
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mkdir flask-wallapop-watcher
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cd flask-wallapop-watcher
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pip3 install virtualenv
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virtualenv --python=python3 .venv
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source .venv/bin/activate
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wget https://raw.githubusercontent.com/tanrax/flask-wallapop-watcher/master/requirements.txt
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pip3 install -r requirements.txt
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```
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---
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#### 1.1 Hello PyConES17
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 Template Flask. We created a new file called **app.py**.
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 Plantilla Flask. Creamos un nuevo archivo llamado **app.py**.
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```python3
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from flask import Flask
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# Flask
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app = Flask(__name__)
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app.config['DEBUG'] = True
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app.config['SECRET_KEY'] = 'mi secreto'
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@app.route('/')
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def buscador():
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return 'Hello PyConES17 !!!'
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if __name__ == '__main__':
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app.run()
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```
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 We run and check that everything works.
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 Ejecutamos y comprobamos que todo funciona.
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```bash
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python3 app.py
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```
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```bash
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http://127.0.0.1:5000
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```
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---
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#### 1.2 Templates
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 We created a folder called **templates**. Inside we make two more folders: **layouts** and **items**. In **layouts** we will make a new one with the name **master.html**.
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 Creamos una carpeta llamada **templates**. Dentro dos más: **layouts** y **items**. En **layouts** haremos uno nuevo con el nombre **master.html**.
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```jinja2
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<!DOCTYPE html>
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<html lang="es">
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<head>
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<title>{% block title %}{% endblock %} | Vigilador de Wallapop</title>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="https://bootswatch.com/superhero/bootstrap.css">
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</head>
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<body>
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<div class="container">
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<ul class="nav nav-pills nav-justified">
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<li role="presentation" {% if active_page == "buscador" or not active_page %}class="active"{% endif %}><a href="">Buscador</a></li>
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<li role="presentation" {% if active_page == "programadas" %}class="active"{% endif %}><a href="#">Programadas</a></li>
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</ul>
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{% block body %}{% endblock %}
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</div>
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</body>
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</html>
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```
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 In **items** we are going to have our first real page that will inherit from **master.html**. Within **items** we create **searcher.html**.
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 En **items** vamos a tener nuestra primera página real que va a heredar de **master.html**. Dentro de **items** creamos **buscador.html**.
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```jinja2
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{% extends 'layouts/master.html' %}
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{% set active_page = "buscador" %}
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{% block title %}Buscador{% endblock %}
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{% block body %}
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<h1>Buscador</h1>
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{% endblock %}
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```
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 You update **app.py** to work with our template engine.
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 Actulizamos **app.py** para que trabaje nuestro motor de plantillas.
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```python3
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from flask import Flask, render_template
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# Flask
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app = Flask(__name__)
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app.config['DEBUG'] = True
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app.config['SECRET_KEY'] = 'mi secreto'
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@app.route('/')
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def buscador():
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return render_template('items/buscador.html')
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if __name__ == '__main__':
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app.run()
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```
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 We create the second page where we will have our searches stored. Within **items** we create a new file with the name of **programadas.html**.
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 Creamos la segunda página donde tendremos nuestras busquedas almacenadas. Dentro de **items** creamos un fichero nuevo con el nombre de **programadas.html**.
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```jinja2
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{% extends 'layouts/master.html' %}
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{% set active_page = "programadas" %}
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{% block title %}Programadas{% endblock %}
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{% block body %}
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<h1>Soy la página donde estará las programadas</h1>
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{% endblock %}
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```
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 We update **app.py** with the new page.
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 Actulizamos **app.py** con la nueva página.
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```python3
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from flask import Flask, render_template
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# Flask
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app = Flask(__name__)
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app.config['DEBUG'] = True
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app.config['SECRET_KEY'] = 'mi secreto'
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@app.route('/')
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def buscador():
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return render_template('items/buscador.html')
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@app.route('/programadas')
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def programadas():
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return render_template('items/programadas.html')
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if __name__ == '__main__':
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app.run()
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```
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 As a final detail we will make our browser buttons have the correct routes.
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 Como último detalle haremos que nuestros botones del navegador tengan las rutas correctas.
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```jinja2
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<!DOCTYPE html>
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<html lang="es">
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<head>
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<title>{% block title %}{% endblock %} | Vigilador de Wallapop</title>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="https://bootswatch.com/superhero/bootstrap.css">
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</head>
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<body>
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<div class="container">
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<ul class="nav nav-pills nav-justified">
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<li role="presentation" {% if active_page == "buscador" or not active_page %}class="active"{% endif %}><a href="{{ url_for('buscador') }}">Buscador</a></li>
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<li role="presentation" {% if active_page == "programadas" %}class="active"{% endif %}><a href="{{ url_for('programadas') }}">Programadas</a></li>
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</ul>
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{% block body %}{% endblock %}
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</div>
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</body>
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</html>
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```
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---
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#### 1.3 Forms
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 We make the new file **forms.py**.
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 Realizamos el nuevo archivo **forms.py**.
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```python3
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from flask_wtf import FlaskForm
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from wtforms import StringField, IntegerField
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from wtforms.validators import DataRequired, Length, NumberRange, Optional
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class SearchForm(FlaskForm):
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name = StringField('Nombre', [Length(min=1, max=100, message='Es demasiado largo'), DataRequired(message='Campo obligatorio')])
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price_max = IntegerField('Precio', [NumberRange(1, message='No puede ser inferior a 1'), Optional()])
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```
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 We load it and pass it to the template.
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 Lo cargamos y se lo pasamos a la plantilla.
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```python3
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from flask import Flask, render_template
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from forms import SearchForm
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# Flask
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app = Flask(__name__)
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app.config['DEBUG'] = True
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app.config['SECRET_KEY'] = 'mi secreto'
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@app.route('/', methods=('GET', 'POST'))
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def buscador():
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form = SearchForm()
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if form.validate_on_submit():
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pass
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return render_template('items/buscador.html', form=form)
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@app.route('/programadas')
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def programadas():
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return render_template('items/programadas.html')
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if __name__ == '__main__':
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app.run()
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```
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 We print the fields with a **loop** in our template **buscador.html**.
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 Imprimimos los campos con un **bucle** en nuestra plantilla **buscador.html**.
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```jinja2
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{% extends 'layouts/master.html' %}
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{% set active_page = "buscador" %}
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{% block title %}Buscador{% endblock %}
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{% block body %}
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<h1>Buscador</h1>
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<div class="row">
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<div class="col-xs-12">
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<form method="post">
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{{ form.csrf_token }}
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{% for input in form %}
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{% if input.type != 'CSRFTokenField' %}
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<div class="form-group">
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{# Label #}
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{{ input.label }}
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{# Input #}
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{{ input(class="form-control") }}
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{# Errors #}
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{% if input.errors %}
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<div class="has-error">
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{% for error in input.errors %}
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<label class="help-block">
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{{ error }}
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</label>
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{% endfor %}
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</div>
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{% endif %}
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</div>
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{% endif %}
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{% endfor %}
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<input type="submit" class="btn btn-primary" value="Buscar">
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</form>
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</div>
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</div>
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{% endblock %}
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```
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---
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#### 1.4 Search
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 It's time for fun. First we update our **app.py** to get the form data if you pass the validations. Then, with that information, we will make a call to the Wallapop API. We will only need the URL that they use in your APP. With **urllib3** we will have all the results in a simple dictionary. Which is great, since it is easy to iterate within our template.
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 Ha llegado la hora de lo divertido. Primero actulizamos nuestro **app.py** para obtener los datos del formulario si pasa las validaciones. Después, con esa información, haremos una llamada al API de Wallapop. Solo necesitaremos la URL que utilizan en su APP. Con *urllib3* tendremos todos los resultados en un sencillo diccionario. Lo cual es magnífico, ya que es fácil de iterar dentro de nuestra plantilla.
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```python3
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from flask import Flask, render_template, request
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from forms import SearchForm
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# Get data Wallapop
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import json
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from urllib3 import PoolManager
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import urllib.parse
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# Flask
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app = Flask(__name__)
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app.config['DEBUG'] = True
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app.config['SECRET_KEY'] = 'mi secreto'
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@app.route('/', methods=('GET', 'POST'))
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def buscador():
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form = SearchForm()
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results = None
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if form.validate_on_submit():
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name = form.name.data
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price_max = form.price_max.data or ''
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# Search in Wallapop
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results = get_resultados(name, price_max)
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return render_template('items/buscador.html', form=form, results=results)
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@app.route('/programadas')
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def programadas():
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return render_template('items/programadas.html')
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def get_resultados(name='', price_max=''):
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http = PoolManager()
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url_api = 'http://es.wallapop.com/rest/items?minPrice=&maxPrice={price_max}&dist=&order=creationDate-des&lat=41.398077&lng=2.170432&kws={kws}'.format(
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kws=urllib.parse.quote(name, safe=''),
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price_max=price_max
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)
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results = http.request('GET', url_api)
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results = json.loads(
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results.data.decode('utf-8')
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)
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return results['items']
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if __name__ == '__main__':
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app.run()
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```
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 And in our template of **buscador.html**.
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 Y en nuestra plantilla de **buscador.html**.
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```jinja2
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{% extends 'layouts/master.html' %}
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{% set active_page = "buscador" %}
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{% block title %}Buscador{% endblock %}
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{% block body %}
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<h1>Buscador</h1>
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<div class="row">
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<div class="col-xs-12">
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<form method="post">
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{{ form.csrf_token }}
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{% for input in form %}
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{% if input.type != 'CSRFTokenField' %}
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<div class="form-group">
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{# Label #}
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{{ input.label }}
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{# Input #}
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{{ input(class="form-control") }}
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{# Errors #}
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{% if input.errors %}
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<div class="has-error">
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{% for error in input.errors %}
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<label class="help-block">
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{{ error }}
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</label>
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{% endfor %}
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</div>
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{% endif %}
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</div>
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{% endif %}
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{% endfor %}
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<input type="submit" class="btn btn-primary" value="Buscar">
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</form>
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</div>
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</div>
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{% if results %}
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<table class="table">
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{% for item in results %}
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<tr>
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<td><img class="img-responsive" src="{{ item.pictureURL }}" alt="{{ item.title }}"></td>
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<td>{{ item.title }}</td>
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<td>{{ item.price }}</td>
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<td><a href="#" class="btn btn-success">+</a></td>
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</tr>
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{% endfor %}
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</table>
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{% endif %}
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{% endblock %}
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```
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 And ... *Voilá*.
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 Y... *Voilá*.
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### Break (Descanso) - 10 min
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 We debug bugs and prepare for the next point.
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 Depuramos bugs y nos preparamos para el siguiente punto.
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---
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### Part 2 - Databases and CRUD with Flask (Bases de datos y CRUD elementos con Flask)
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#### 2.1 Models
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 Con **Flask-alquemy** vamos a definir la estructura de nuestra base de datos. En este caso tendremos una única tabla llamada *Programado* con los campos: *id*, *title* y *last_item*. Para ello crearemos un nuevo archivo con el nombre **models.py**.
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```python3
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from flask import Flask
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from flask_sqlalchemy import SQLAlchemy
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app = Flask(__name__)
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app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.sqlite'
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app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
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db = SQLAlchemy(app)
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class Programado(db.Model):
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id = db.Column(db.Integer, primary_key=True)
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title = db.Column(db.String(128))
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last_item = db.Column(db.Integer)
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```
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 Esta forma de trabajar tan limpia carece de varias funcionalidades básicas, como migraciones o la posibilidad de ejecutar ordenes por medio del terminal. Para ello le sumaremos **Flask-Migrate** para las migraciones automáticas y **Flask-Script** para su gestión.
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```python3
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from flask import Flask
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from flask_sqlalchemy import SQLAlchemy
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from flask_script import Manager
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from flask_migrate import Migrate, MigrateCommand
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app = Flask(__name__)
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app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.sqlite'
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app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
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db = SQLAlchemy(app)
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migrate = Migrate(app, db)
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manager = Manager(app)
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manager.add_command('db', MigrateCommand)
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class Programado(db.Model):
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id = db.Column(db.Integer, primary_key=True)
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title = db.Column(db.String(128))
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last_item = db.Column(db.Integer)
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if __name__ == "__main__":
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manager.run()
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```
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 Abrimos nuestro terminal e iniciamos la base de datos, creamos la primera migración y actualizamos la base de datos.
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```bash
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python3 models.py db init
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python3 models.py db migrate
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python3 models.py db upgrade
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```
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 Comprobamos que todo ha ido bien.
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```bash
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sqlite3 database.sqlite
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.schema Programado
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.exit
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```
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---
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#### 2.2 Save item
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 Para guarda un elemento necesitamos modificar nuestra plantilla **buscador.html**. Enviaremos un *POST*. Qué sencillamente será un **<form>** con las variables ocultas. En este caso lo que haremos será mostrar el botón solamente visible cuando recibamos una petición *POST*. Su finalidad será realizar una petición a la página *programadas_nuevo()* con el nombre que hemos buscado.
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```jinja2
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{% extends 'layouts/master.html' %}
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{% set active_page = "buscador" %}
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{% block title %}Buscador{% endblock %}
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{% block body %}
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<h1>Buscador</h1>
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<div class="row">
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<div class="col-xs-12">
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<form method="post">
|
|
{{ form.csrf_token }}
|
|
{% for input in form %}
|
|
{% if input.type != 'CSRFTokenField' %}
|
|
<div class="form-group">
|
|
{# Label #}
|
|
{{ input.label }}
|
|
{# Input #}
|
|
{{ input(class="form-control") }}
|
|
{# Errors #}
|
|
{% if input.errors %}
|
|
<div class="has-error">
|
|
{% for error in input.errors %}
|
|
<label class="help-block">
|
|
{{ error }}
|
|
</label>
|
|
{% endfor %}
|
|
</div>
|
|
{% endif %}
|
|
</div>
|
|
{% endif %}
|
|
{% endfor %}
|
|
<input type="submit" class="btn btn-primary" value="Buscar">
|
|
</form>
|
|
{% if results %}
|
|
<form action="{{ url_for('programadas_nuevo') }}" method="post">
|
|
<input type="hidden" name="title" value="{{ form.name.data }}">
|
|
<input type="submit" class="btn btn-success" value="Programar">
|
|
</form>
|
|
{% endif %}
|
|
</div>
|
|
</div>
|
|
{% if results %}
|
|
<table class="table">
|
|
{% for item in results %}
|
|
<tr>
|
|
<td><img class="img-responsive" src="{{ item.pictureURL }}" alt="{{ item.title }}"></td>
|
|
<td>{{ item.title }}</td>
|
|
<td>{{ item.price }}</td>
|
|
</tr>
|
|
{% endfor %}
|
|
</table>
|
|
{% endif %}
|
|
{% endblock %}
|
|
```
|
|
|
|
 Ahora, es el momento de crear la función para *programadas_nuevo()* en **app.py**. Lo primero que le indicamos es que solo puede aceptar peticiones *POST*. A continuación creamos variables para guardar la información del formulario. Después creamos el registro en la base de datos. Por último redireccionamos a la anterior página para ver el nuevo elemento.
|
|
|
|
 Vayamos por partes. Importamos **db** que será nuestro *ORM*, y **Programado** que será la tabla a manipular.
|
|
|
|
```python3
|
|
from models import db, Programado
|
|
```
|
|
|
|
 Creamos el nuevo registro.
|
|
|
|
```python3
|
|
my_program = Programado(
|
|
title=title
|
|
)
|
|
```
|
|
|
|
 Lo añadimos a la cola.
|
|
|
|
```python3
|
|
db.session.add(my_program)
|
|
```
|
|
|
|
 Y ejecutamos las modificaciones. En caso que fallara, dejaría los datos como estaban.
|
|
|
|
```python3
|
|
try:
|
|
db.session.commit()
|
|
except:
|
|
db.session.rollback()
|
|
```
|
|
|
|
 Todo junto quedará así.
|
|
|
|
```python3
|
|
from flask import Flask, render_template, request, redirect, url_for
|
|
from forms import SearchForm
|
|
# Get data Wallapop
|
|
import json
|
|
from urllib3 import PoolManager
|
|
import urllib.parse
|
|
# Database
|
|
from models import db, Programado
|
|
|
|
# Flask
|
|
app = Flask(__name__)
|
|
app.config['DEBUG'] = True
|
|
app.config['SECRET_KEY'] = 'mi secreto'
|
|
|
|
@app.route('/', methods=('GET', 'POST'))
|
|
def buscador():
|
|
form = SearchForm()
|
|
results = None
|
|
if form.validate_on_submit():
|
|
name = form.name.data
|
|
price_max = form.price_max.data or ''
|
|
# Search in Wallapop
|
|
results = get_resultados(name, price_max)
|
|
return render_template('items/buscador.html', form=form, results=results)
|
|
|
|
|
|
def get_resultados(name='', price_max=''):
|
|
http = PoolManager()
|
|
url_api = 'http://es.wallapop.com/rest/items?minPrice=&maxPrice={price_max}&dist=&order=creationDate-des&lat=41.398077&lng=2.170432&kws={kws}'.format(
|
|
kws=urllib.parse.quote(name, safe=''),
|
|
price_max=price_max
|
|
)
|
|
results = http.request('GET', url_api)
|
|
results = json.loads(
|
|
results.data.decode('utf-8')
|
|
)
|
|
return results['items']
|
|
|
|
|
|
@app.route('/programadas/nuevo', methods=('POST',))
|
|
def programadas_nuevo():
|
|
title = request.form['title']
|
|
# We saved in the database
|
|
my_program = Programado(
|
|
title=title
|
|
)
|
|
db.session.add(my_program)
|
|
try:
|
|
db.session.commit()
|
|
except:
|
|
db.session.rollback()
|
|
|
|
return redirect(url_for('programadas'))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
app.run()
|
|
```
|
|
|
|
---
|
|
#### 2.3 View items
|
|
|
|
 Lamentablemente veremos la página vacía. Por ahora. Haremos una consulta a la base de datos para que nos de todos los registros de la tabla **Programado**, y se lo pasaremos a la plantilla. Para ello modificaremos la función que renderiza la plantilla **programadas.html**, que en nuestro caso se llama **programadas()** y esta en **app.py**.
|
|
|
|
```python3
|
|
from flask import Flask, render_template, request, redirect, url_for
|
|
from forms import SearchForm
|
|
# Get data Wallapop
|
|
import json
|
|
from urllib3 import PoolManager
|
|
import urllib.parse
|
|
# Database
|
|
from models import db, Programado
|
|
|
|
# Flask
|
|
app = Flask(__name__)
|
|
app.config['DEBUG'] = True
|
|
app.config['SECRET_KEY'] = 'mi secreto'
|
|
|
|
@app.route('/', methods=('GET', 'POST'))
|
|
def buscador():
|
|
form = SearchForm()
|
|
results = None
|
|
if form.validate_on_submit():
|
|
name = form.name.data
|
|
price_max = form.price_max.data or ''
|
|
# Search in Wallapop
|
|
results = get_resultados(name, price_max)
|
|
return render_template('items/buscador.html', form=form, results=results)
|
|
|
|
|
|
@app.route('/programadas')
|
|
def programadas():
|
|
programado_all = Programado.query.all()
|
|
return render_template('items/programadas.html', programado_all=programado_all)
|
|
|
|
|
|
def get_resultados(name='', price_max=''):
|
|
http = PoolManager()
|
|
url_api = 'http://es.wallapop.com/rest/items?minPrice=&maxPrice={price_max}&dist=&order=creationDate-des&lat=41.398077&lng=2.170432&kws={kws}'.format(
|
|
kws=urllib.parse.quote(name, safe=''),
|
|
price_max=price_max
|
|
)
|
|
results = http.request('GET', url_api)
|
|
results = json.loads(
|
|
results.data.decode('utf-8')
|
|
)
|
|
return results['items']
|
|
|
|
|
|
@app.route('/programadas/nuevo', methods=('POST',))
|
|
def programadas_nuevo():
|
|
title = request.form['title']
|
|
# We saved in the database
|
|
|
|
my_program = Programado(
|
|
title=title
|
|
)
|
|
db.session.add(my_program)
|
|
try:
|
|
db.session.commit()
|
|
except:
|
|
db.session.rollback()
|
|
|
|
return redirect(url_for('programadas'))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
app.run()
|
|
```
|
|
|
|
 Actualizamos la plantilla **programadas.html** con un *bucle* para mostrar todos los resultados en una tabla de HTML.
|
|
|
|
```jinja2
|
|
{% extends 'layouts/master.html' %}
|
|
{% set active_page = "programadas" %}
|
|
{% block title %}Programadas{% endblock %}
|
|
{% block body %}
|
|
<h1>Programadas</h1>
|
|
<table class="table">
|
|
<thead>
|
|
<tr>
|
|
<th scope="col">Titulo</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
{% for item in programado_all %}
|
|
<tr>
|
|
<td>{{ item.title }}</td>
|
|
</tr>
|
|
{% endfor %}
|
|
</tbody>
|
|
</table>
|
|
{% endblock %}
|
|
```
|
|
|
|
---
|
|
#### 2.4 Delete item
|
|
|
|
 Repetiremos la estrategia anterior. En el *bucle* que muestra todos los resultados en **programadas.html**, añadimos un formulario que nos envíe un *id* a una futura función que definiremos en **app.py**.
|
|
|
|
```jinja2
|
|
{% extends 'layouts/master.html' %}
|
|
{% set active_page = "programadas" %}
|
|
{% block title %}Programadas{% endblock %}
|
|
{% block body %}
|
|
<h1>Programadas</h1>
|
|
<table class="table">
|
|
<thead>
|
|
<tr>
|
|
<th scope="col">Titulo</th>
|
|
<th></th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
{% for item in programado_all %}
|
|
<tr>
|
|
<td>{{ item.title }}</td>
|
|
<td>
|
|
<form action="{{ url_for('programadas_borrar') }}" method="post">
|
|
<input type="hidden" name="id" value="{{ item.id }}">
|
|
<input type="submit" class="btn btn-danger" value="-">
|
|
</form>
|
|
</td>
|
|
</tr>
|
|
{% endfor %}
|
|
</tbody>
|
|
</table>
|
|
{% endblock %}
|
|
```
|
|
|
|
 La manera de eliminar un registro consiste en realizar una busqueda de los elementos que quieres eliminar, y luego ponerlo en la cola para eliminarlos. Por último ejecutas la orden como antes.
|
|
|
|
```python3
|
|
db.session.delete(my_program)
|
|
try:
|
|
db.session.commit()
|
|
except:
|
|
db.session.rollback()
|
|
```
|
|
|
|
 Quedaría así.
|
|
|
|
```python3
|
|
from flask import Flask, render_template, request, redirect, url_for
|
|
from forms import SearchForm
|
|
# Get data Wallapop
|
|
import json
|
|
from urllib3 import PoolManager
|
|
import urllib.parse
|
|
# Database
|
|
from models import db, Programado
|
|
|
|
# Flask
|
|
app = Flask(__name__)
|
|
app.config['DEBUG'] = True
|
|
app.config['SECRET_KEY'] = 'mi secreto'
|
|
|
|
@app.route('/', methods=('GET', 'POST'))
|
|
def buscador():
|
|
form = SearchForm()
|
|
results = None
|
|
if form.validate_on_submit():
|
|
name = form.name.data
|
|
price_max = form.price_max.data or ''
|
|
# Search in Wallapop
|
|
results = get_resultados(name, price_max)
|
|
return render_template('items/buscador.html', form=form, results=results)
|
|
|
|
|
|
@app.route('/programadas')
|
|
def programadas():
|
|
programado_all = Programado.query.all()
|
|
return render_template('items/programadas.html', programado_all=programado_all)
|
|
|
|
|
|
def get_resultados(name='', price_max=''):
|
|
http = PoolManager()
|
|
url_api = 'http://es.wallapop.com/rest/items?minPrice=&maxPrice={price_max}&dist=&order=creationDate-des&lat=41.398077&lng=2.170432&kws={kws}'.format(
|
|
kws=urllib.parse.quote(name, safe=''),
|
|
price_max=price_max
|
|
)
|
|
results = http.request('GET', url_api)
|
|
results = json.loads(
|
|
results.data.decode('utf-8')
|
|
)
|
|
return results['items']
|
|
|
|
|
|
@app.route('/programadas/nuevo', methods=('POST',))
|
|
def programadas_nuevo():
|
|
title = request.form['title']
|
|
# We saved in the database
|
|
|
|
my_program = Programado(
|
|
title=title
|
|
)
|
|
db.session.add(my_program)
|
|
try:
|
|
db.session.commit()
|
|
except:
|
|
db.session.rollback()
|
|
|
|
return redirect(url_for('programadas'))
|
|
|
|
|
|
@app.route('/programadas/borrar', methods=('POST',))
|
|
def programadas_borrar():
|
|
my_program = Programado.query.get(request.form['id'])
|
|
db.session.delete(my_program)
|
|
try:
|
|
db.session.commit()
|
|
except:
|
|
db.session.rollback()
|
|
|
|
return redirect(url_for('programadas'))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
app.run()
|
|
```
|
|
|
|
---
|
|
#### 2.5 Flash messages
|
|
|
|
 Tenemos un problema de usabilidad: ¡El usuario esta a ciegas cuando añade o borra! Tenemos que informarle de que esta pasando cuando apreta botones. Para ello nos haremos uso de los **Fash messages**. Como queremos que se vean en todas nuestras páginas, modificamos **master.html**.
|
|
|
|
```jinja2
|
|
<!DOCTYPE html>
|
|
<html lang="es">
|
|
<head>
|
|
<title>{% block title %}{% endblock %} | Vigilador de Wallapop</title>
|
|
<meta charset="UTF-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
|
<link rel="stylesheet" href="https://bootswatch.com/superhero/bootstrap.css">
|
|
</head>
|
|
<body>
|
|
<div class="container">
|
|
<ul class="nav nav-pills nav-justified">
|
|
<li role="presentation" {% if active_page == "buscador" or not active_page %}class="active"{% endif %}><a href="{{ url_for('buscador') }}">Buscador</a></li>
|
|
<li role="presentation" {% if active_page == "programadas" %}class="active"{% endif %}><a href="{{ url_for('programadas') }}">Programadas</a></li>
|
|
</ul>
|
|
{# Flashed messages #}
|
|
{% with messages = get_flashed_messages() %}
|
|
{% if messages %}
|
|
{% for message in messages %}
|
|
<div class="alert alert-success" role="alert">{{ message }}</div>
|
|
{% endfor %}
|
|
{% endif %}
|
|
{% endwith %}
|
|
{# End Flashed messages #}
|
|
{% block body %}{% endblock %}
|
|
</div>
|
|
</body>
|
|
</html>
|
|
```
|
|
|
|
 Ahora ya será visible todos los mensajes en cajas elegantes de *Bootstrap*. Importamos **flash**.
|
|
|
|
```python3
|
|
from flask import Flask, render_template, request, redirect, url_for, flash
|
|
```
|
|
|
|
 Y añadimos los mensajes que deseamos ver. Por ejemplo.
|
|
|
|
```python3
|
|
try:
|
|
db.session.commit()
|
|
flash('Añadida con éxito.')
|
|
except:
|
|
db.session.rollback()
|
|
```
|
|
|
|
 Nuestro **app.py** se nos quedaría así.
|
|
|
|
```python3
|
|
from flask import Flask, render_template, request, redirect, url_for, flash
|
|
from forms import SearchForm
|
|
# Get data Wallapop
|
|
import json
|
|
from urllib3 import PoolManager
|
|
import urllib.parse
|
|
# Database
|
|
from models import db, Programado
|
|
|
|
# Flask
|
|
app = Flask(__name__)
|
|
app.config['DEBUG'] = True
|
|
app.config['SECRET_KEY'] = 'mi secreto'
|
|
|
|
@app.route('/', methods=('GET', 'POST'))
|
|
def buscador():
|
|
form = SearchForm()
|
|
results = None
|
|
if form.validate_on_submit():
|
|
name = form.name.data
|
|
price_max = form.price_max.data or ''
|
|
# Search in Wallapop
|
|
results = get_resultados(name, price_max)
|
|
return render_template('items/buscador.html', form=form, results=results)
|
|
|
|
|
|
@app.route('/programadas')
|
|
def programadas():
|
|
programado_all = Programado.query.all()
|
|
return render_template('items/programadas.html', programado_all=programado_all)
|
|
|
|
|
|
def get_resultados(name='', price_max=''):
|
|
http = PoolManager()
|
|
url_api = 'http://es.wallapop.com/rest/items?minPrice=&maxPrice={price_max}&dist=&order=creationDate-des&lat=41.398077&lng=2.170432&kws={kws}'.format(
|
|
kws=urllib.parse.quote(name, safe=''),
|
|
price_max=price_max
|
|
)
|
|
results = http.request('GET', url_api)
|
|
results = json.loads(
|
|
results.data.decode('utf-8')
|
|
)
|
|
return results['items']
|
|
|
|
|
|
@app.route('/programadas/nuevo', methods=('POST',))
|
|
def programadas_nuevo():
|
|
title = request.form['title']
|
|
# We saved in the database
|
|
|
|
my_program = Programado(
|
|
title=title
|
|
)
|
|
db.session.add(my_program)
|
|
try:
|
|
db.session.commit()
|
|
flash('Añadida con éxito.')
|
|
except:
|
|
db.session.rollback()
|
|
|
|
return redirect(url_for('programadas'))
|
|
|
|
|
|
@app.route('/programadas/borrar', methods=('POST',))
|
|
def programadas_borrar():
|
|
my_program = Programado.query.get(request.form['id'])
|
|
db.session.delete(my_program)
|
|
try:
|
|
db.session.commit()
|
|
flash('Borrada "{title}".'.format(title=my_program.title))
|
|
except:
|
|
db.session.rollback()
|
|
|
|
return redirect(url_for('programadas'))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
app.run()
|
|
```
|
|
|
|
---
|
|
### Break (Descanso) - 10 min
|
|
|
|
 We take air for the last part. Otherwise, we make as we go to the bathroom and do not come back.
|
|
|
|
 Cogemos aire para la última parte. En caso contrario, hacemos como que vamos al baño y nos piramos.
|
|
|
|
---
|
|
### Part 3 - Sending emails with new items (Envío de emails con nuevos elementos)
|
|
|
|
#### 3.1 Command
|
|
|
|
 Ya tenemos montado nuestra interfaz para gestionar nuestras busquedas. Lo siguiente será crear un *script* que se encargue de verificar si hay nuevos resultados. Y si es así, enviarnos un *email*. El primer paso será crear con Flask un comando personalizado. Realizamos un nuevo archivo llamado **avisador.py**.
|
|
|
|
```python3
|
|
#!/usr/bin/env python3
|
|
from flask_script import Manager
|
|
from app import app
|
|
|
|
manager = Manager(app)
|
|
|
|
@manager.command
|
|
def hello():
|
|
print('hello PyConES17')
|
|
|
|
if __name__ == "__main__":
|
|
manager.run()
|
|
```
|
|
|
|
 Para probar que funciona ejecutamos, siempre con el entorno virtual activo, lo siguiente.
|
|
|
|
```bash
|
|
chmod +x avisador.py
|
|
./avisador.py hello
|
|
```
|
|
|
|
 Si todo ha ido bien nos responderá.
|
|
|
|
```bash
|
|
hello PyConES17
|
|
```
|
|
|
|
---
|
|
#### 3.2 SMTP Server
|
|
|
|
 Para enviar un email si o si necesitaremos una servidor SMTP. Podéis usar GMail, Hotmail, Fastmail... o cualquier cuenta de correo. Para el taller, usaremos Mailgun. Un poderoso servicio profesional para el envío de emails. Nos permite 10.000 envíos mensuales gratuitos. Suficientes para lo que necesitamos. Entramos aquí.
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[Mailgun](https://signup.mailgun.com/new/signup)
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 Creamos una nueva cuenta.
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 Confirmamos nuestra cuenta por el enlace que nos han enviado a nuestro email.
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 Al pulsar sobre el enlace nos llevará a esta página. Confirmamos nuestro teléfono y pulsamos en *Domains*. ¡Ojo! Si no confirmáis vuestro teléfono, Mailgun no funcionará.
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 Entramos en nuestro dominio activo.
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 Aquí tendremos los accesos que necesitaremos. Dejamos abierta esta página para más adelante.
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---
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#### 3.3 Send email
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 Ya tenemos nuestro servidor de email. Ahora vamos a enviar un correo de prueba. Abrimos **avisador.py** para importar **flask-mail**.
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```python3
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from flask_mail import Mail, Message
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```
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 Configuramos **flask-mail**. **MAIL_USERNAME** será **Default SMTP Login** de *mailgun*. Y **MAIL_PASSWORD** será **Default Password** de *mailgun*.
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```python3
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app.config.update(
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MAIL_SERVER='smtp.mailgun.org',
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MAIL_PORT=587,
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MAIL_USERNAME='tu_default_smtp_login',
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MAIL_PASSWORD='tu_default_password'
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)
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mail = Mail(app)
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```
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 Creamos un comando para que nos envíe un *email* de prueba.
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```python3
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@manager.command
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def send_email():
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msg = Message(
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"Nuevo aviso",
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sender="no-reply@pycon17.es",
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recipients=["tu_email"]
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)
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msg.body = "testing"
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msg.html = "<b>testing</b>"
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mail.send(msg)
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```
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 Todo junto quedaría así.
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```python3
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#!/usr/bin/env python3
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from flask_script import Manager
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from app import app
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from flask_mail import Mail, Message
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app.config.update(
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MAIL_SERVER='smtp.mailgun.org',
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MAIL_PORT=587,
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MAIL_USERNAME='tu_default_smtp_login',
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MAIL_PASSWORD='tu_default_password'
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)
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mail = Mail(app)
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manager = Manager(app)
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@manager.command
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def send_email():
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msg = Message(
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"Nuevo aviso",
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sender="no-reply@pycon17.es",
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recipients=["tu_email"]
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)
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msg.body = "testing"
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msg.html = "<b>testing</b>"
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mail.send(msg)
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if __name__ == "__main__":
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manager.run()
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```
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 Ejecutamos.
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```bash
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./avisador.py send_email
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```
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 Revisamos nuestra bandeja de entrada. En caso contrario buscamos en *spam*.
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--
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#### 3.4 Notification
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 Estamos listos para realizar el sistema de notificación. La lógica será básica: buscamos todos los productos que tenga la palabra que tenemos guarda. Nos quedamos con la primera *id*. Si la *id* es la misma que tenemos en la base de datos, no hacemos nada. Si es diferente, actualizamos la base de datos y enviamos un email.
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 Abrimos **avisador.py**. Primero, importamos nuestra funcion para obtener los elementos del API de Wallapop.
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```python3
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from app import app, get_resultados
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```
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 Además, importamos nuestra tabla con las palabras guardadas.
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```python3
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from models import db, Programado
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```
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 Recorremos todas las palabras almacenadas.
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```python3
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@manager.command
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def send_email():
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programados = Programado.query.all()
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for item in programados:
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```
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 Obtenemos el primer *id*. Que lo usaremos para comparar si la tenemos guardada.
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|
```python3
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@manager.command
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def send_email():
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programados = Programado.query.all()
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for item in programados:
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# Get last id
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results = get_resultados(item.title)
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itemId = results[0]['itemId']
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if int(itemId) != item.last_item:
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```
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 Para actualizar en SQLAlchemy hay que obtener el resultado, modificar el objeto, y devolverlo. Para ilustrar la forma de trabajar dejo un ejemplo. Modifico la columna *gana* que es un *boolean* y la columna *nombre* que es un *string*.
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```python3
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spartano = User.query.filter_by(id=1).first()
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spartano.gana = False
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spartano.nombre = 'Leónidas'
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db.session.add(spartano)
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db.session.commit()
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```
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|
 En nuestro código quedaría implementado de la siguiente forma.
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|
```python3
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@manager.command
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def send_email():
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programados = Programado.query.all()
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for item in programados:
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# Get last id
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results = get_resultados(item.title)
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itemId = results[0]['itemId']
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# Update last item in database
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if int(itemId) != item.last_item:
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programado_update = Programado.query.filter_by(id=item.id).first()
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programado_update.last_item = itemId
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db.session.add(programado_update)
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try:
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db.session.commit()
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except:
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db.session.rollback()
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```
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|
|
 Ya solo nos queda enviar el *email*.
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|
|
```python3
|
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@manager.command
|
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def send_email():
|
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programados = Programado.query.all()
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for item in programados:
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# Get last id
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results = get_resultados(item.title)
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itemId = results[0]['itemId']
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# Update last item in database
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if int(itemId) != item.last_item:
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programado_update = Programado.query.filter_by(id=item.id).first()
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programado_update.last_item = itemId
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db.session.add(programado_update)
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try:
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db.session.commit()
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except:
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db.session.rollback()
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# Send email
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msg = Message(
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"Nuevo aviso",
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sender="no-reply@pycon17.es",
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recipients=["tu email"]
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)
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msg.body = render_template('emails/notificacion.txt', title=results[0]['title'], id=itemId)
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msg.html = render_template('emails/notificacion.html', title=results[0]['title'], id=itemId)
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mail.send(msg)
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```
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|
 Todo junto quedaría.
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|
|
|
|
```python3
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#!/usr/bin/env python3
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from flask import render_template
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from flask_script import Manager
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from app import app, get_resultados
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from flask_mail import Mail, Message
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from models import db, Programado
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|
|
|
app.config.update(
|
|
MAIL_SERVER='smtp.mailgun.org',
|
|
MAIL_PORT=587,
|
|
MAIL_USERNAME='tu_default_smtp_login',
|
|
MAIL_PASSWORD='tu_default_password'
|
|
)
|
|
mail = Mail(app)
|
|
|
|
manager = Manager(app)
|
|
|
|
@manager.command
|
|
def send_email():
|
|
programados = Programado.query.all()
|
|
for item in programados:
|
|
# Get last id
|
|
results = get_resultados(item.title)
|
|
itemId = results[0]['itemId']
|
|
# Update last item in database
|
|
if int(itemId) != item.last_item:
|
|
programado_update = Programado.query.filter_by(id=item.id).first()
|
|
programado_update.last_item = itemId
|
|
db.session.add(programado_update)
|
|
try:
|
|
db.session.commit()
|
|
except:
|
|
db.session.rollback()
|
|
# Send email
|
|
msg = Message(
|
|
"Nuevo aviso",
|
|
sender="no-reply@pycon17.es",
|
|
recipients=["tu email"]
|
|
)
|
|
msg.body = render_template('emails/notificacion.txt', title=results[0]['title'], id=itemId)
|
|
msg.html = render_template('emails/notificacion.html', title=results[0]['title'], id=itemId)
|
|
mail.send(msg)
|
|
|
|
if __name__ == "__main__":
|
|
manager.run()
|
|
```
|
|
|
|
---
|
|
#### 3.5 View email
|
|
|
|
 Ya no estoy enviando un texto sencillo en el *email*. Necesito la magia de *flask* con su *render_template*. Puedes observar como hago uso de dos plantillas donde paso dos variables. El *titulo* y la *id* del item.
|
|
|
|
 Creamos una carpeta nueva dentro de *templates* con el nombre *emails*. Y dentro de esta, el archivo *notificacion.html* y *notificacion.txt*. Quedará la estructura así.
|
|
|
|
```bash
|
|
--> templates
|
|
--> emails
|
|
--> notificacion.html
|
|
--> notificacion.txt
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|
--> items
|
|
--> buscador.html
|
|
--> programadas.html
|
|
--> layouts
|
|
--> master.html
|
|
```
|
|
|
|
 Abrimos *notificacion.txt* e introducimos.
|
|
|
|
```txt
|
|
Aviso
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|
|
|
{{ title }}
|
|
|
|
http://p.wallapop.com/i/{{ id }}?_pid=web&_me=www&campaign=mobile_item
|
|
```
|
|
|
|
 Y en *notificacion.html* lo siguiente.
|
|
|
|
```html
|
|
<!DOCTYPE html>
|
|
<html lang="es">
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
<meta http-equiv="X-UA-Compatible" content="ie=edge">
|
|
<title>Notificacion</title>
|
|
</head>
|
|
<body>
|
|
<h1>Aviso</h1>
|
|
<h2>{{ title }}</h2>
|
|
<a href="http://p.wallapop.com/i/{{ id }}?_pid=web&_me=www&campaign=mobile_item">Ver</a>
|
|
</body>
|
|
</html>
|
|
```
|
|
|
|
 ¡E voilà! Ya hemos terminado. Cuando nos llegue los nuevos avisos podremos pulsar en el enlace para ver la ficha del producto. Y si estamos en el smartphone, se nos abrirá la aplicación oficial.
|
|
|
|
---
|
|
#### 3.6 Automation
|
|
|
|
 Para revisar y recibir los emails solo tendrás que ejecutar el comando personalizado. De la misma forma que antes.
|
|
|
|
```bash
|
|
./avisador.py send_email
|
|
```
|
|
|
|
 Mi recomendación es ejecutarlo en un *cron* cada hora y listo.
|
|
|
|
 |