Uploading chapter 11 code examples

Chapter11/grades_ms/grades/grades/asgi.py

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+"""
+ASGI config for grades project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/3.2/howto/deployment/asgi/
+"""
+
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'grades.settings')
+
+application = get_asgi_application()

Chapter11/students_ms/Dockerfile

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+# Use the official lightweight Python image.
+# https://hub.docker.com/_/python
+FROM python:3.8-slim
+
+# Allow statements and log messages to immediately appear in the Knative logs
+ENV PYTHONUNBUFFERED True
+
+# Copy local code to the container image.
+WORKDIR /app
+COPY . ./
+
+# Install production dependencies.
+RUN pip install -r requirements.txt
+RUN pip install Flask gunicorn
+
+# Run the web service on container startup. Here we use the gunicorn
+# webserver, with one worker process and 8 threads.
+# For environments with multiple CPU cores, increase the number of workers
+# to be equal to the cores available.
+# Timeout is set to 0 to disable the timeouts of the workers to allow Cloud Run to handle instance scaling.
+CMD exec gunicorn --bind :$PORT --workers 1 --threads 8 --timeout 0 api_app:app

Chapter11/students_ms/api_app.py

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+# api_app: REST API for student resource
+from flask_sqlalchemy import SQLAlchemy
+from flask import Flask
+from flask_restful import Resource, Api, reqparse
+
+app = Flask(__name__)
+api = Api(app)
+
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///student.db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db = SQLAlchemy(app)
+
+parser = reqparse.RequestParser()
+parser.add_argument('name', type=str)
+parser.add_argument('grade', type=str)
+
+
+class Student(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(80), nullable=False)
+    grade = db.Column(db.String(20), nullable=True)
+
+    def __repr__(self):
+        return f"{'id':{self.id}, 'name':{self.name},'grade':{self.grade}}"
+
+    def serialize(self):
+        return {
+            'id': self.id,
+            'name': self.name,
+            'grade': self.grade
+        }
+
+
+class StudentDao(Resource):
+    def get(self, student_id):
+        student = Student.query.filter_by(id=student_id).\
+            first_or_404(
+                description='Record with id={} is not available'.format(student_id))
+        return student.serialize()
+
+    def delete(self, student_id):
+        student = Student.query.filter_by(id=student_id).\
+            first_or_404(
+                description='Record with id={} is not available'.format(student_id))
+        db.session.delete(student)
+        db.session.commit()
+        return '', 204
+
+    def put(self, student_id):
+        student = Student.query.filter_by(id=student_id).first_or_404(
+            description='Record with id={} is not available'.format(student_id))
+        args = parser.parse_args()
+        name = args['name']
+        grade = args['grade']
+        if (name):
+            student.name = name
+        if (grade):
+            student.grade = grade
+        db.session.commit()
+        return student.serialize(), 200
+
+
+class StudentListDao(Resource):
+    def get(self):
+        students = Student.query.all()
+        return [Student.serialize(student) for student in students]
+
+    def post(self):
+        args = parser.parse_args()
+        name = args['name']
+        grade = args['grade']
+        student = Student(name=name, grade=grade)
+        db.session.add(student)
+        db.session.commit()
+        return student.serialize(), 200
+
+
+api.add_resource(StudentDao, '/students/<student_id>')
+api.add_resource(StudentListDao, '/students')
+
+
+if __name__ == '__main__':
+    # app.run(debug=True)
+    app.run(debug=True, host="0.0.0.0", port=int(os.environ.get("PORT", 8080)))

Chapter11/students_ms/requirements.txt

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+aniso8601==9.0.1
+attrs==21.2.0
+certifi==2021.5.30
+chardet==4.0.0
+click==8.0.1
+Flask==2.0.1
+Flask-RESTful==0.3.9
+flask-restplus==0.13.0
+Flask-SQLAlchemy==2.5.1
+greenlet==1.1.0
+idna==2.10
+itsdangerous==2.0.1
+Jinja2==3.0.1
+jsonschema==3.2.0
+MarkupSafe==2.0.1
+pyrsistent==0.17.3
+pytz==2021.1
+requests==2.25.1
+six==1.16.0
+SQLAlchemy==1.4.19
+urllib3==1.26.6
+utils-flask-sqlalchemy==0.1.4
+Werkzeug==2.0.1

Chapter11/webapp/templates/base.html

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+<!doctype html>
+<html lang="en">
+
+<head>
+    <!-- Required meta tags -->
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+
+    <!-- Bootstrap CSS -->
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/css/bootstrap.min.css" rel="stylesheet"
+        integrity="sha384-BmbxuPwQa2lc/FVzBcNJ7UAyJxM6wuqIj61tLrc4wSX0szH/Ev+nYRRuWlolflfl" crossorigin="anonymous">
+    <link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
+        <script src="{{ url_for('static', filename='js/test.js') }}"></script>
+    <title> {% block title %} {% endblock title %} - Students</title>
+</head>
+
+<body>
+    <nav class="navbar navbar-expand-lg navbar-light bg-light">
+        <div class="container-fluid">
+            <a class="navbar-brand" href="/">Students</a>
+            <button class="navbar-toggler" type="button" data-bs-toggle="collapse"
+                data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false"
+                aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="navbarSupportedContent">
+                <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+                    <li class="nav-item">
+                        <a class="nav-link active" aria-current="page" href="#">Home</a>
+                    </li>
+                    <li class="nav-item">
+                        <a class="nav-link" href="#">About</a>
+                    </li>
+                </ul>
+
+            </div>
+        </div>
+    </nav>
+{% block body %}
+    
+{% endblock body %}
+</body>
+
+</html>

Chapter11/webapp/templates/main.html

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+{% extends 'base.html' %}
+{% block title %} Home{% endblock title %} 
+{% block body %}
+
+
+    <div class="container my-3">
+        <h2>Add a Student</h2>
+        <form action="/" method="POST">
+
+            <div class="mb-2">
+              <label for="fname" class="form-label">First name</label>
+              <input type="text" class="form-control" name="fname" id="fname" aria-describedby="emailHelp">
+            </div>
+            <div class="mb-2">
+              <label for="lname" class="form-label">Last Name</label>
+              <input type="text" class="form-control" name="lname" id="lname" aria-describedby="emailHelp">
+            </div>
+            <div class="mb-2">
+              <label for="grade" class="form-label">Grade</label>
+              <input type="text" class="form-control" name="grade" id="grade">
+            </div>
+            <button type="submit" class="btn btn-dark">Submit</button>
+          </form>
+    </div>
+
+    <div class="container my-3">
+        <h2>Students</h2>
+            {% if students|length == 0 %}
+                <div class="alert alert-dark" role="alert">
+                    No student found. Add your first student now!
+                  </div>
+                    {% else %} 
+                    <table class="table">
+                        <thead>
+                          <tr>
+                              <th scope="col">No</th>
+                              <th scope="col">Name</th>
+                              <th scope="col">Grade</th>
+                              <th scope="col">Building</th>
+                              <th scope="col">Teacher</th>
+                            <th scope="col">Actions</th>
+                          </tr>
+                        </thead>
+                        
+                        <tbody>
+              {% for student in students %}
+              <tr>
+                <th scope="row">{{loop.index}}</th>
+                <td>{{student.name}}</td>
+                <td>{{student.grade}}</td>
+                  <td>{{student.building}}</td>
+                  <td>{{student.teacher}}</td>
+                <td>
+                  <a href="/update/{{student.id}}" type="button" class="btn btn-outline-dark btn-sm mx-1">Update</button>
+                  <a href="/delete/{{student.id}}" type="button" class="btn btn-outline-dark btn-sm mx-1">Delete</button>
+                
+                </td>
+              </tr>
+              
+              {% endfor %}
+            </tbody>
+            </table>
+            {% endif %}
+               
+           
+    </div>
+    <!-- Optional JavaScript; choose one of the two! -->
+
+    <!-- Option 1: Bootstrap Bundle with Popper -->
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/js/bootstrap.bundle.min.js"
+        integrity="sha384-b5kHyXgcpbZJO/tY9Ul7kGkf1S0CWuKcCD38l8YkeH8z8QjE0GmW1gYU5S9FOnJ0"
+        crossorigin="anonymous"></script>
+
+    <!-- Option 2: Separate Popper and Bootstrap JS -->
+    <!--
+    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.6.0/dist/umd/popper.min.js" integrity="sha384-KsvD1yqQ1/1+IA7gi3P0tyJcT3vR+NdBTt13hSJ2lnve8agRGXTTyNaBYmCR/Nwi" crossorigin="anonymous"></script>
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/js/bootstrap.min.js" integrity="sha384-nsg8ua9HAw1y0W1btsyWgBklPnCUAFLuTMS2G72MMONqmOymq585AcH49TLBQObG" crossorigin="anonymous"></script>
+    -->
+
+{% endblock body %}

Chapter11/webapp/templates/update.html

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+{% extends 'base.html' %}
+{% block title %} Home{% endblock title %} 
+{% block body %}
+
+    <div class="container my-3">
+        <h2>Update Student</h2>
+        <form action="/update/{{student.id}}" method="POST">
+           <div class="mb-3">
+              <label for="fname" class="form-label">First name</label>
+              <input type="text" class="form-control" name="fname" id="fname" value="{{fname}}" aria-describedby="emailHelp">
+            </div>
+            <div class="mb-3">
+              <label for="lname" class="form-label">Last Name</label>
+              <input type="text" class="form-control" name="lname" id="lname" value="{{lname}}"  aria-describedby="emailHelp">
+            </div>
+            <div class="mb-3">
+              <label for="grade" class="form-label">Grade</label>
+              <input type="text" class="form-control" name="grade" id="grade" value="{{student.grade}}" >
+            </div>
+
+            <button type="submit" class="btn btn-dark">Update</button>
+          </form>
+    </div>
+   
+    <!-- Optional JavaScript; choose one of the two! -->
+
+    <!-- Option 1: Bootstrap Bundle with Popper -->
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/js/bootstrap.bundle.min.js"
+        integrity="sha384-b5kHyXgcpbZJO/tY9Ul7kGkf1S0CWuKcCD38l8YkeH8z8QjE0GmW1gYU5S9FOnJ0"
+        crossorigin="anonymous"></script>
+
+    <!-- Option 2: Separate Popper and Bootstrap JS -->
+    <!--
+    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.6.0/dist/umd/popper.min.js" integrity="sha384-KsvD1yqQ1/1+IA7gi3P0tyJcT3vR+NdBTt13hSJ2lnve8agRGXTTyNaBYmCR/Nwi" crossorigin="anonymous"></script>
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/js/bootstrap.min.js" integrity="sha384-nsg8ua9HAw1y0W1btsyWgBklPnCUAFLuTMS2G72MMONqmOymq585AcH49TLBQObG" crossorigin="anonymous"></script>
+    -->
+
+{% endblock body %}

Chapter11/webapp/webapp.py

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+#webapp.py: interacting with business latyer via REST API
+# for create, delete and list objects
+from flask import Flask, render_template, redirect, request
+import requests, json
+
+app = Flask(__name__)
+
+#STUDENTS_MS = "http://localhost:8080/students"
+STUDENTS_MS = "https://students2-wwzgfqvyaa-de.a.run.app/students"
+
+GRADES_MS = "http://localhost:8000/grades"
+
+@app.get('/')
+def list():
+    student_svc_resp = requests.get(STUDENTS_MS)
+    students = json.loads(student_svc_resp.text)
+
+    grades_svc_resp = requests.get(GRADES_MS)
+    grades_list = json.loads(grades_svc_resp.text)
+
+    grades_dict = {grade_item['grade_id']:
+                        grade_item for grade_item in grades_list}
+    for student in students:
+        student['building'] = grades_dict[student['grade']]['building']
+        student['teacher'] = grades_dict[student['grade']]['teacher']
+
+    return render_template('main.html', students=students)
+
+@app.post('/')
+def add():
+    fname = request.form['fname']
+    lname = request.form['lname']
+    grade = request.form['grade']
+    payload = {'name': f"{fname} {lname}", 'grade': grade}
+    respone = requests.post(STUDENTS_MS, data=payload)
+    return redirect("/")
+
+@app.get('/delete/<int:id>')
+def delete(id):
+    response = requests.delete(STUDENTS_MS+'/'+str(id))
+    return redirect("/")
+
+@app.post('/update/<int:id>')
+def update(id):
+    fname = request.form['fname']
+    lname = request.form['lname']
+    grade = request.form['grade']
+    payload = {'name' : f"{fname} {lname}", 'grade':grade}
+    respone = requests.put(STUDENTS_MS+'/' + str(id), data = payload)
+    return redirect("/")
+
+@app.get('/update/<int:id>')
+def load_student_for_update(id):
+    response = requests.get(STUDENTS_MS+'/'+str(id))
+    student = json.loads(response.text)
+    fname = student['name'].split()[0]
+    lname = student['name'].split()[1]
+    return render_template('update.html', fname=fname, lname=lname, student= student)
+
+if __name__ == '__main__':
+    app.run(debug=True, host='0.0.0.0', port=80)