CN 2023-03-29

# app.py
from flask import Flask, request, render_template
from tools import str_to_date,\
    diff_between_dates
from datetime import datetime

app = Flask(__name__)

HTML_NAME_FOR_THE_DATE = "d"

# NOT a view
def obtain_user_date():
    str_user_date = None
    b_GET:bool = request.method=='GET'
    b_POST:bool = request.method=='POST'

    if(b_GET):
        b_caution:bool = HTML_NAME_FOR_THE_DATE in\
            request.args.keys()
        if(b_caution):
            str_user_date = \
                request.args[HTML_NAME_FOR_THE_DATE]
            return str_user_date
        # if
    else:
        if(b_POST):
            b_caution:bool = HTML_NAME_FOR_THE_DATE in\
                request.form.keys()
            if(b_caution):
                str_user_date = \
                    request.form[HTML_NAME_FOR_THE_DATE]
                return str_user_date
            # if
        # if
    # if-else
    #return "no user date"
    return None
# obtain_user_date

# decorator
@app.route("/", methods=['POST', 'GET'])
def respond_to_distance_request():
    the_user_date = obtain_user_date()

    if(the_user_date!=None):
        the_date:datetime = \
            str_to_date(the_user_date)

        response:dict = diff_between_dates(
            the_date
        )

        #return response # dict (appears as a JSON response }
        return render_template(
            "date_input.html",
            response_available=True,
            d_days=response['days'],
            d_hours=response['hours']
        )
    #
    else:
        # tested OK - displays the input form
        return render_template(
            "date_input.html"
        )
# def respond_to_distance_request

app.run(
    host="0.0.0.0", # all network interfaces
    port=5555,
    debug=True
)

***********************
# tools.py
from datetime import\
    datetime, timedelta

def str_to_date(
    p_date:str,
    p_format:str="%Y-%m-%d"
):
    d:datetime =\
        datetime.strptime(
            p_date,
            p_format
        )
    return d
# def str_to_date

def diff_between_dates(
    p_d1:datetime,
    p_d2:datetime=None
):
    if(p_d2==None):
        p_d2=datetime.now()
    # if
    diff:timedelta = abs(p_d1-p_d2)
    diff_days:float = diff.days
    diff_seconds:float = diff.total_seconds()
    diff_hours:float = diff_seconds/60/60
    """
    dict_response:dict = dict()
    dict_response['days']=diff_days
    dict_response['hours']=diff_hours
    """
    dict_response:dict = {
        "days":diff_days,
        "hours":diff_hours
    }
    # import json
    # return json.dumps(dict_response)
    return dict_response
# def diff_between_dates

********

<!-- ./templates/date_input.html -->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Date Input</title>
</head>
<body>
    <form
        action="http://127.0.0.1:5555/"
        method="POST"
        enctype="application/x-www-form-urlencoded"
    >
        <label for="id_d">Your date:</label>
        <input
            id="id_d"
            name="d"
            type="date"
            pattern="\d{2,4}-\d{1,2}-\d{1,2}"
            value="1969-06-21"
        ><br>
        <input
            type="submit"
            value="compute distance to today">
    </form>
    <hr>
    <!-- results in a conditional Jinja2 template -->
    {% if response_available is defined %}
    <ul>
        <li>Distance in days: {{d_days}}</li>
        <li>Distance in days: {{d_hours}}</li>
    </ul>
    {% endif %}
</body>
</html>

********

cloudbuild.yaml
steps:
- name: "gcr.io/cloud-builders/gcloud"
  args: ["app", "deploy"]
timeout: "1600s"

app.yaml
runtime: python38
entrypoint: gunicorn -w 2 name-of-flask-app-python-module:name-of-flask-var