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flaskapp.py
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flaskapp.py
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import datetime
import json
from sqlalchemy.sql.expression import ClauseElement
from flask import Flask
from flask import render_template
from flask_sqlalchemy import SQLAlchemy
from flask.ext.cors import CORS, cross_origin
from flask.ext.security import Security, SQLAlchemyUserDatastore, \
UserMixin, RoleMixin, login_required
from sqlalchemy import event, desc
from settings import *
from api_helper import ApiHelper
from matplotlib import pyplot as plt
import os
import sys
import logging
import hashlib
import time
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.sqlite3'
app.config['SECRET_KEY'] = SECRET_KEY
CORS(app)
db = SQLAlchemy(app)
def dget(d, fields):
res = None
for field in fields:
res = d.get(field, {})
d = res
return res == {} and None or res
def create_or_update(session, model, defaults=None, **kwargs):
instance = session.query(model).filter_by(**kwargs).first()
if instance:
for k, v in (defaults or {}).items():
setattr(instance, k, v)
return instance, False
else:
params = dict((k, v) for k, v in kwargs.iteritems() if not isinstance(v, ClauseElement))
params.update(defaults or {})
instance = model(**params)
session.add(instance)
return instance, True
"""*********** User management ************"""
roles_users = db.Table('roles_users',
db.Column('user_id', db.Integer(), db.ForeignKey('user.id')),
db.Column('role_id', db.Integer(), db.ForeignKey('role.id')))
class Role(db.Model, RoleMixin):
id = db.Column(db.Integer(), primary_key=True)
name = db.Column(db.String(80), unique=True)
description = db.Column(db.String(255))
class User(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(255), unique=True)
password = db.Column(db.String(255))
active = db.Column(db.Boolean())
confirmed_at = db.Column(db.DateTime())
roles = db.relationship('Role', secondary=roles_users,
backref=db.backref('users', lazy='dynamic'))
offers = db.relationship("UserOffer", backref="user")
trackers = db.relationship("UserTracker", backref="user")
# Setup Flask-Security
user_datastore = SQLAlchemyUserDatastore(db, User, Role)
security = Security(app, user_datastore)
""" ****************** Models ******************** """
class Category(db.Model):
category_id = db.Column(db.String(STR_LEN), primary_key=True)
name = db.Column(db.String(STR_LEN))
has_children = db.Column(db.Boolean)
parent_id = db.Column(db.String(STR_LEN), db.ForeignKey('category.category_id'))
children = db.relationship('Category', backref=db.backref('parent', remote_side=[category_id]))
@classmethod
def fetch_all_categories(cls):
categories = cls.query.filter()
@classmethod
def save_categories(cls, category_data_list):
session = db.session
for category_data in category_data_list:
cls.save_category(category_data, session=session)
session.commit()
@classmethod
def save_category(cls, category_data, session=None):
category = cls(category_id=category_data['id'],
name=category_data.get('name'),
has_children=category_data.get('hasChildren'))
if session:
session.add(category)
else:
db.session.add(category)
db.session.commit()
class AllegroUser(db.Model):
THRESHOLDS = [5, 50, 250, 2500, 12500, 1e9]
login = db.Column(db.String(STR_LEN), primary_key=True)
rating = db.Column(db.Integer)
@classmethod
def user_rating_class(cls, rating):
rclass = 0
for threshold in cls.THRESHOLDS:
if rating < threshold:
return rclass
rclass += 1
class Offer(db.Model):
JSON_FIELDS = ['offer_id', 'title', 'seller_login', 'url', 'image_url', 'sold', 'finished',
'buy_now_price', 'highest_bid_amount', 'sold_price', 'cheapest_shipment',
'bids_number', 'published_dt', 'end_dt', 'changed_dt', 'sold_dt']
offer_id = db.Column(db.String(STR_LEN), primary_key=True)
title = db.Column(db.Text)
seller = db.relationship('AllegroUser')
seller_login = db.Column(db.String(STR_LEN), db.ForeignKey('allegro_user.login'))
url = db.Column(db.String(STR_LEN))
image_url = db.Column(db.String(STR_LEN))
sold = db.Column(db.Boolean)
finished = db.Column(db.Boolean)
buy_now_price = db.Column(db.Float)
highest_bid_amount = db.Column(db.Float)
sold_price = db.Column(db.Float)
cheapest_shipment = db.Column(db.Float)
bids_number = db.Column(db.Integer)
published_dt = db.Column(db.DateTime)
end_dt = db.Column(db.DateTime)
changed_dt = db.Column(db.DateTime)
sold_dt = db.Column(db.DateTime)
@classmethod
def from_api_to_dict(cls, data):
seller, created = create_or_update(db.session, AllegroUser, login=data['seller']['login'],
defaults={'rating': data['seller']['rating']})
image_urls = [dget(data, ['mainImage', size]) for size in IMAGE_SIZE_ORDER]
ending_time = data.get('endingTime')
res = {
'offer_id': data['id'],
'title' : data.get('name'),
'seller': seller,
'url': data.get('url'),
'image_url': image_urls and image_urls[0],
'buy_now_price': dget(data, ['prices', 'buyNow']),
'highest_bid_amount': dget(data, ['prices', 'bid']),
'cheapest_shipment': dget(data, ['prices', 'cheapestShipment']),
'bids_number': dget(data, ['bids', 'count'])
}
if ending_time is not None:
res['end_dt'] = datetime.datetime.fromtimestamp(ending_time)
return res
class TrackerOffer(db.Model):
offer_id = db.Column(db.String(STR_LEN), db.ForeignKey('offer.offer_id'), primary_key=True)
tracker_id = db.Column(db.Integer, db.ForeignKey('tracker.id'), primary_key=True)
offer = db.relationship("Offer")
class UserOffer(db.Model):
# statuses
OFFER_NOT_VIEWED = "not_viewed"
OFFER_VIEWED = "viewed"
OFFER_DISMISSED = "dismissed"
offer_id = db.Column(db.String(STR_LEN), db.ForeignKey('offer.offer_id'), primary_key=True)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), primary_key=True)
offer = db.relationship("Offer")
status = db.Column(db.String(STR_LEN), default=OFFER_NOT_VIEWED)
last_seen = db.Column(db.DateTime)
class UserTracker(db.Model):
tracker_id = db.Column(db.Integer, db.ForeignKey('tracker.id'), primary_key=True)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), primary_key=True)
tracker = db.relationship("Tracker")
class Purchase(db.Model):
offer = db.relationship("Offer", backref="purchases")
offer_id = db.Column(db.String(STR_LEN), db.ForeignKey('offer.offer_id'), primary_key=True)
buyer = db.relationship('AllegroUser')
buyer_login = db.Column(db.String(STR_LEN), db.ForeignKey('allegro_user.login'))
sold_price = db.Column(db.Integer)
sold_dt = db.Column(db.DateTime)
buy_now = db.Column(db.Boolean)
class OfferLog(db.Model):
offer = db.relationship("Offer", backref="logs")
offer_id = db.Column(db.String(STR_LEN), db.ForeignKey('offer.offer_id'), primary_key=True)
highest_bid_amount = db.Column(db.Integer)
buy_now_price = db.Column(db.Integer)
end_dt = db.Column(db.DateTime)
created_at_dt = db.Column(db.DateTime, primary_key=True)
class Tracker(db.Model):
JSON_FIELDS = ['id', 'name', 'query_string', 'min_price', 'max_price', 'image_url']
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(STR_LEN))
query_string = db.Column(db.String(STR_LEN))
min_price = db.Column(db.Integer)
max_price = db.Column(db.Integer)
image_url = db.Column(db.String(STR_LEN))
offers = db.relationship('TrackerOffer', backref='tracker')
def get_image_url(self):
if self.image_url:
return self.image_url
offers = sorted(filter(lambda x: x.offer.image_url, self.offers),
key=lambda x: max(x.offer.buy_now_price, x.offer.highest_bid_amount),
reverse=True)
if offers:
self.image_url = offers[0].offer.image_url
db.session.commit()
return self.image_url
def fetch_offers(self, reset=False):
if reset or (not self.offers):
for offer_data in ApiHelper.request_offers(self.query_string,
min_price=self.min_price,
max_price=self.max_price):
offer_data_dict = Offer.from_api_to_dict(offer_data)
offer, created = create_or_update(db.session, Offer,
offer_id=offer_data_dict.get('offer_id'),
defaults=offer_data_dict)
tracker_offer, created = create_or_update(db.session, TrackerOffer,
tracker_id=self.id, offer_id=offer.offer_id)
db.session.commit()
def on_offer_field_change(field):
from sqlalchemy.util import symbol
def _on_field_change(offer, value, old_value, initiator):
if old_value == symbol('NO_VALUE') or old_value == symbol('NEVER_SET'):
old_value = None
if offer.offer_id and value != old_value and old_value is not None:
log = OfferLog(offer=offer)
log.offer_id = offer.offer_id
setattr(log, field, old_value)
db.session.add(log)
db.session.commit()
return _on_field_change
event.listen(Offer.buy_now_price, 'set', on_offer_field_change('buy_now_price'))
event.listen(Offer.end_dt, 'set', on_offer_field_change('end_dt'))
event.listen(Offer.highest_bid_amount, 'set', on_offer_field_change('highest_bid_amount'))
def instance_to_dict(mapper, instance):
res = dict()
for field in mapper.JSON_FIELDS:
res[field] = getattr(instance, field)
return res
@event.listens_for(OfferLog, 'before_insert')
def on_offer_log_insert(mapper, connection, offer_log):
offer_log.created_at_dt = datetime.datetime.now()
app.logger.addHandler(logging.StreamHandler(sys.stdout))
app.logger.setLevel(logging.ERROR)
@cross_origin()
@app.route("/trackers")
def get_trackers():
#global_user = User.query.filter(User.email==USER_EMAIL).first()
trackers = []
#for user_tracker in UserTracker.query.filter(UserTracker.user==global_user):
for tracker in Tracker.query.all():
tracker.fetch_offers()
print(tracker.name, tracker.get_image_url())
tracker_dict = instance_to_dict(Tracker, tracker)
print(tracker_dict)
trackers.append(tracker_dict)
return json.dumps(trackers)
@cross_origin()
@app.route("/create_tracker", methods=['POST'])
def create_tracker():
global_user = User.query.filter(User.email==USER_EMAIL).first()
data = json.loads(request.data)
tracker = Tracker(**data)
db.session.add(tracker)
user_tracker = UserTracker(user=global_user, tracker=tracker)
db.session.add(user_tracker)
db.session.commit()
tracker.fetch_offers(reset=data.get('reset', False))
@cross_origin()
@app.route("/offers_for_tracker/<tracker_id>")
def user_offers_for_tracker(tracker_id):
tracker_offer_ids = map(lambda x: x.offer.offer_id,
TrackerOffer.query.filter(TrackerOffer.tracker_id==tracker_id))
offers = []
for user_offer in UserOffer.query.filter(UserOffer.offer_id.in_(tracker_offer_ids)):
offer_data = instance_to_dict(Offer, user_offer.offer)
offer_data['status'] = user_offer.status
offers.append(offer_data)
return json.dumps(offers)
@cross_origin()
@app.route("/dismiss_offer/<offer_id>")
def dismiss_offer(offer_id):
global_user = User.query.filter(User.email==USER_EMAIL).first()
user_offer = UserOffer.query.filter(UserOffer.user==global_user).filter(UserOffer.offer_id==offer_id).first()
if user_offer:
user_offer.status = UserOffer.OFFER_DISMISSED
db.session.commit()
return app.send_static_file('index.html')
@cross_origin()
@app.route("/view_offer/<offer_id>")
def view_offer(offer_id):
global_user = User.query.filter(User.email==USER_EMAIL).first()
user_offer = UserOffer.query.filter(UserOffer.user==global_user).filter(UserOffer.offer_id==offer_id).first()
if user_offer:
user_offer.status = UserOffer.OFFER_VIEWED
db.session.commit()
return app.send_static_file('index.html')
@app.route("/")
def index():
return app.send_static_file('index.html')
@app.route("/mvp/<query>")
def mvp(query):
offers = list(ApiHelper.request_offers(query_string=query,
min_price=100,
max_price=9000))
prices = []
for offer in offers:
if(offer['prices']['buyNow']>1):
prices.append(offer['prices']['buyNow'])
plt.figure(2)
plt.hist(prices, bins=20, normed=True)
m=hashlib.md5()
m.update(query)
hash = str(int(time.time()))
plt.savefig('static/histogram'+hash+'.png')
return render_template("mvp.html", offers=offers, hash=hash, req=query)
if __name__ == '__main__':
app.run(debug=True)