system-design-primer/solutions/object_oriented_design/online_chat/online_chat.py
2018-05-06 21:26:01 -04:00

105 lines
2.4 KiB
Python

from abc import ABCMeta
from enum import Enum
class UserService(object):
def __init__(self):
self.users_by_id = {} # key: user id, value: User
def add_user(self, user_id, name, pass_hash):
pass
def remove_user(self, user_id):
pass
def add_friend_request(self, from_user_id, to_user_id):
pass
def approve_friend_request(self, from_user_id, to_user_id):
pass
def reject_friend_request(self, from_user_id, to_user_id):
pass
class User(object):
def __init__(self, user_id, name, pass_hash):
self.user_id = user_id
self.name = name
self.pass_hash = pass_hash
self.friends_by_id = {} # key: friend id, value: User
self.friend_ids_to_private_chats = {} # key: friend id, value: private chats
self.group_chats_by_id = {} # key: chat id, value: GroupChat
self.received_friend_requests_by_friend_id = {} # key: friend id, value: AddRequest
self.sent_friend_requests_by_friend_id = {} # key: friend id, value: AddRequest
def message_user(self, friend_id, message):
pass
def message_group(self, group_id, message):
pass
def send_friend_request(self, friend_id):
pass
def receive_friend_request(self, friend_id):
pass
def approve_friend_request(self, friend_id):
pass
def reject_friend_request(self, friend_id):
pass
class Chat(metaclass=ABCMeta):
def __init__(self, chat_id):
self.chat_id = chat_id
self.users = []
self.messages = []
class PrivateChat(Chat):
def __init__(self, first_user, second_user):
super(PrivateChat, self).__init__()
self.users.append(first_user)
self.users.append(second_user)
class GroupChat(Chat):
def add_user(self, user):
pass
def remove_user(self, user):
pass
class Message(object):
def __init__(self, message_id, message, timestamp):
self.message_id = message_id
self.message = message
self.timestamp = timestamp
class AddRequest(object):
def __init__(self, from_user_id, to_user_id, request_status, timestamp):
self.from_user_id = from_user_id
self.to_user_id = to_user_id
self.request_status = request_status
self.timestamp = timestamp
class RequestStatus(Enum):
UNREAD = 0
READ = 1
ACCEPTED = 2
REJECTED = 3