balises/balises.py

#!/usr/bin/env python3

from argparse import ArgumentParser
from configparser import ConfigParser
from datetime import datetime, timedelta

import bs4
import requests
import os

from peewee import *
from bottle import hook, request, route, run, view

# ------------------------------------------------------------
conf = ConfigParser()
conf.read(os.path.dirname(__file__) + '/balises.ini')

db = MySQLDatabase(conf['mysql'].get('database'),
                   user=conf['mysql'].get('user'),
                   password=conf['mysql'].get('password'),
                   host=conf['mysql'].get('host', 'localhost'),
                   port=conf['mysql'].getint('port', 3306))

class BaseModel(Model):
    class Meta:
        database = db

class Song(BaseModel):
    id = AutoField()
    artist = CharField(default='')
    title = CharField(default='')

    class Meta:
        indexes = (
            (('artist', 'title'), True),  # Unique on artist + title
        )

class AirCast(BaseModel):
    id = AutoField()
    date = DateTimeField()
    song = ForeignKeyField(Song, backref='dates')


# ----------------------------------------------------------------------
# Util functions

def http_get(url):
    response = requests.get(url);
    if response.status_code == 200:
        pass
    else:
        print('Uh, oh, unable to fetch', url)
        print('Http status code:', response.status_code)
        raise Error('Download error')
    return response


# ----------------------------------------------------------------------
# Get song informations

last_ten_url = 'https://radiobalises.com/Play-list/last10.html'

def get_last_ten():
    response = http_get(last_ten_url)
    soup = bs4.BeautifulSoup(response.content, 'html5lib')
    dates = soup.select('p.rldj-cell span.post-date')
    for elem in dates:
        dt = datetime.fromisoformat(elem.text)
        artist, title = [x.strip() for x in elem.previous.previous.split(' - ', 1)]
        song, _ = Song.get_or_create(artist=artist, title=title)
        # get_or_create does not play nice with the unique constraint on the date
        # so we use a simple try/except instead
        try:
            aircast = AirCast.get(date=dt, song=song)
        except DoesNotExist:
            aircast = AirCast.create(date=dt, song=song)

        line_template = '{:<10} | {:<25} {:<40}'
        print(line_template.format(str(dt), artist, title))


# ----------------------------------------------------------------------
# Search song

def search_song(query):
    # query must be a datetime
    delta = timedelta(minutes=30)

    query = AirCast.select().order_by(AirCast.date).where(
        (AirCast.date > query - delta) &
        (AirCast.date < query + delta))
    results = [x for x in query]

    return results

def print_aircast(x):
    line_template = '{:<10} | {:<25} {:<40}'
    print(line_template.format(str(x.date), x.song.artist, x.song.title))


# ----------------------------------------------------------------------
# Web application
#
# Very simple, just a page with an input for a date/time, a query button and a
# list of results

@route('/', method='GET')
@view('search_form')
def main_page():
    now = datetime.now()
    date = '{}'.format(now.date())
    time = '{}:{}'.format(now.hour, now.minute)
    return dict(title='', date=date, time=time)

@route('/', method='POST')
@view('search_results')
def results_page():
    date = request.forms.date
    time = request.forms.time
    dt = datetime.fromisoformat('{} {}'.format(date, time))
    results = search_song(dt)
    return dict(results=[x for x in results], date=date, time=time)

@hook('before_request')
def connect_to_db():
    db.connect()

@hook('after_request')
def close_db_connection():
    db.close()

# ----------------------------------------------------------------------
# Argument parsing
# use a decorator to simplify argparse usage, as suggested by
# https://mike.depalatis.net/blog/simplifying-argparse.html

cli = ArgumentParser(description='Balises')
subparsers = cli.add_subparsers(dest="subcommand")

def subcommand(args=[], parent=subparsers):
    def decorator(func):
        parser = parent.add_parser(func.__name__, description=func.__doc__)
        for arg in args:
            parser.add_argument(*arg[0], **arg[1])
        parser.set_defaults(func=func)
    return decorator

def argument(*name_or_flags, **kwargs):
    return ([*name_or_flags], kwargs)


@subcommand([argument('query', help='Search query')])
def search(args):
    results = search_song(datetime.fromisoformat(args.query))
    for res in results:
        print_aircast(res)


@subcommand()
def update(args):
    get_last_ten()


@subcommand()
def serve(args):
    run(host=conf['server'].get('host', 'localhost'),
        port=conf['server'].getint('port', 9980),
        debug=conf['server'].getboolean('debug', False))


# ----------------------------------------------------------------------
# Main

def main():
    args = cli.parse_args()
    if args.subcommand is None:
        cli.print_help()
    else:
        args.func(args)

if __name__ == '__main__':
    main()