vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

pmav99

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: Panagiotis Mavrogiorgos
# email: gmail, pmav99

from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
from __future__ import absolute_import

lechup

from __future__ import absolute_import

import signal
import gevent
import gevent.pool
from rq import Worker
from rq.timeouts import BaseDeathPenalty, JobTimeoutException
from rq.worker import StopRequested, green, blue
from rq.exceptions import DequeueTimeout

corydolphin

from flask import Flask
from flask.json import JSONEncoder
from bson import json_util
from mongoengine.base import BaseDocument
from mongoengine.queryset.base import BaseQuerySet

class MongoEngineJSONEncoder(JSONEncoder):
    def default(self,obj):
        if isinstance(obj,BaseDocument):
            return json_util._json_convert(obj.to_mongo())

podhmo

import sqlalchemy as sa
import sqlalchemy.orm as orm
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.orm import scoped_session, sessionmaker

DBSession = scoped_session(sessionmaker())
class BaseMixin(object):
    query = DBSession.query_property()
    id = sa.Column(sa.Integer, primary_key=True)