dellwatch-release.py

import logging
from pathlib import Path
import time

import requests

MAILGUN_API_KEY = 'key-xxxxx'
MAILGUN_DOMAIN = 'yourdomain.ca'
MAILGUN_FROM = 'dellwatch <dellwatch@yourdomain.ca>'
MAILGUN_TO = 'you@yourdomain.ca'

DELL_API_URL = 'http://www.dell.com/csbapi/en-ca/productanavfilter/GetSystemsResults?ProductCode=xps-15-9560-laptop&page=1&pageSize=16&sappOrderCode=nxps159560_bt_s1637e&preview'

APP_NAME = 'dellwatch'
DEFAULT_LOG_LEVEL = 'INFO'
LOG_PATH = str(Path('~/.dellwatch.log').expanduser())
log = logging.getLogger(APP_NAME)

# if someone set our log level before we initialized, keep their preference
# example: ipython initialization script
if not log.level:
    log.setLevel(DEFAULT_LOG_LEVEL)

fmt = logging.Formatter(
    '{asctime} {levelname} {filename}:{lineno}: {message}',
    datefmt='%b %d %H:%M:%S',
    style='{'
)

# prevent adding of extra handlers if autoreload is in use
for handler in log.handlers:
    if isinstance(handler, logging.FileHandler):
        break
else:
    hnd = logging.FileHandler(LOG_PATH)
    hnd.setFormatter(fmt)
    log.addHandler(hnd)


relevant_specs = ['PROC', 'MEMRY', 'HDRV', 'VIDEO', 'DISPLY', 'BTRY']

sale_fmt = """
Sale: {pricing[MarketValue][Value]} -> {pricing[DellPrice][Value]} on {itemid}
{exp_block}
{specs}
""".lstrip().rstrip()

seen_deals = set()

def is_on_sale(pricing):
    return pricing['DellPrice']['InnerValue'] < pricing['MarketValue']['InnerValue']

def make_specs(stack):
    spec_list = []
    for ts in stack['Specs']['TechSpecs']:
        if ts['Code'] in relevant_specs:
            spec_list.append(' '.join((ts['Code'], str(ts['Values']))))
    return spec_list

def process_stack(stack):
    pricing = stack['Stack']['Pricing']
    if not is_on_sale(pricing):
        return
    itemid = stack['Specs']['ItemIdentifier']
    specs = '\n'.join(make_specs(stack))
    exp_block = '\n'.join([itm['ExpirationText'] for itm in pricing['SavingsDetails']['Details']])
    return sale_fmt.format(pricing=pricing, itemid=itemid, specs=specs, exp_block=exp_block)

def process_resp(json_resp):
    deals = []
    for stack in json_resp['Results']['Stacks']:
        pretty = process_stack(stack)
        if pretty in seen_deals:
            log.debug('Found seen deal, skipping...')
            continue
        if pretty:
            deals.append(pretty)
            seen_deals.add(pretty)
    return deals

def mail_report(deals):
    return requests.post(
        f'https://api.mailgun.net/v3/{MAILGUN_DOMAIN}/messages',
        auth=('api', MAILGUN_API_KEY),
        data={'from': MAILGUN_FROM,
              'to': [MAILGUN_TO],
              'subject': 'dellwatch sales',
              'text': '\n\n'.join(deals)})


def check_sales():
    resp = requests.get(DELL_API_URL)
    deals = process_resp(resp.json())
    log.info('Checked for sales')
    if len(deals) <= 0:
        return
    mail_report(deals)

if __name__ == '__main__':
    while True:
        try:
            check_sales()
        except Exception as e:
            if isinstance(e, KeyboardInterrupt):
                break
            log.exception('Encountered an error!', e)
        time.sleep(60 * 60 * 24)