48 lines
1.9 KiB
Python
48 lines
1.9 KiB
Python
from pymongo import MongoClient
|
|
from typing import Optional
|
|
|
|
class Database:
|
|
_instance: Optional["Database"] = None
|
|
|
|
def __init__(self, host: str, port: int, db_name: str, username: Optional[str] = None, password: Optional[str] = None, auth_source: Optional[str] = None):
|
|
if username and password:
|
|
# 如果有用户名和密码，使用认证连接
|
|
# TODO: 复杂情况直接支持URI吧
|
|
self.client = MongoClient(host, port, username=username, password=password, authSource=auth_source)
|
|
else:
|
|
# 否则使用无认证连接
|
|
self.client = MongoClient(host, port)
|
|
self.db = self.client[db_name]
|
|
|
|
@classmethod
|
|
def initialize(cls, host: str, port: int, db_name: str, username: Optional[str] = None, password: Optional[str] = None, auth_source: Optional[str] = None) -> "Database":
|
|
if cls._instance is None:
|
|
cls._instance = cls(host, port, db_name, username, password, auth_source)
|
|
return cls._instance
|
|
|
|
@classmethod
|
|
def get_instance(cls) -> "Database":
|
|
if cls._instance is None:
|
|
raise RuntimeError("Database not initialized")
|
|
return cls._instance
|
|
|
|
|
|
#测试用
|
|
|
|
def get_random_group_messages(self, group_id: str, limit: int = 5):
|
|
# 先随机获取一条消息
|
|
random_message = list(self.db.messages.aggregate([
|
|
{"$match": {"group_id": group_id}},
|
|
{"$sample": {"size": 1}}
|
|
]))[0]
|
|
|
|
# 获取该消息之后的消息
|
|
subsequent_messages = list(self.db.messages.find({
|
|
"group_id": group_id,
|
|
"time": {"$gt": random_message["time"]}
|
|
}).sort("time", 1).limit(limit))
|
|
|
|
# 将随机消息和后续消息合并
|
|
messages = [random_message] + subsequent_messages
|
|
|
|
return messages |