约束和限制
- 假设我们聚焦在以下的工作流
-
只是输入Text进行对话
-
Users
- Add a User
- Remove a User
- Update a user
- Add to a user’s friends list
- Add friend request
- Approve friend request
- Reject friend request
- Remove from a user’s friends list
- Add friend request
-
Create a group chat
- 邀请朋友到一个 group chat
- 发送一个消息到一个 group chat
-
私人 1-1 chat
- 邀请一个朋友到一个 Private Chat
- 发送一个消息到一个 Private Chat
-
不需要担心初始化的扩展问题
-
编码实现
from abc import ABCMeta
class UserService(object):
def __init__(self):
self.users_by_id = {}
def add_user(self, user_id, name, pass_hash): #...
def remove_user(self, user_id): #...
def add_friend_request(self, from_user_id, to_user_id): #...
def approve_friend_request(self, from_user_id, to_user_id): #...
def reject_friend_request(self, from_user_id, to_user_id): #...
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 = {}
self.friend_ids_to_private_chats = {}
self.group_chats_by_id = {}
self.received_friend_requests_by_friend_id = {}
self.sent_friend_requests_by_friend_id = {}
def message_user(self, friend_id, message): #...
def message_group(self, group_id, message): #...
def send_friend_request(self, friend_id): #...
def receive_friend_request(self, friend_id): #...
def approve_friend_request(self, friend_id): #...
def reject_friend_request(self, friend_id): #...
class Chat(metaclass=ABCMeta):
def __init__(self, chat_id):
self.chat_id = chat_id
self.users = []
self.message = []
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): #...
def remove_user(self, user): #...
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, message_id, message, timestamp):
self.message_id = message_id
self.message = message
self.timestamp = timestamp
class RequestStatus(Enum):
UNREAD = 0
READ = 1
ACCEPTED = 2
REJETED = 3
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