forked from sangge/tpre-python
151 lines
3.7 KiB
Python
151 lines
3.7 KiB
Python
from fastapi import FastAPI
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from fastapi.encoders import jsonable_encoder
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from fastapi.responses import JSONResponse
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from contextlib import asynccontextmanager
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import sqlite3
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import asyncio
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import time
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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init()
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yield
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clean_env()
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app = FastAPI(lifespan=lifespan)
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# 连接到数据库（如果数据库不存在，则会自动创建）
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conn = sqlite3.connect("server.db")
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# 创建游标对象，用于执行SQL语句
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cursor = conn.cursor()
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# 创建表: id: int; ip: TEXT
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cursor.execute(
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"""CREATE TABLE IF NOT EXISTS nodes (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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ip TEXT NOT NULL,
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last_heartbeat INTEGER
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)"""
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)
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def init():
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asyncio.create_task(receive_heartbeat_internal())
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def clean_env():
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clear_database()
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# 关闭游标和连接
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cursor.close()
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conn.close()
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@app.get("/server/show_nodes")
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async def show_nodes() -> list:
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nodes_list = []
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# 查询数据
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cursor.execute("SELECT * FROM nodes")
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rows = cursor.fetchall()
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for row in rows:
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nodes_list.append(row)
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return nodes_list
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@app.get("/server/get_node")
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async def get_node(ip: str) -> int:
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"""
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中心服务器与节点交互, 节点发送ip, 中心服务器接收ip存入数据库并将ip转换为int作为节点id返回给节点
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params:
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ip: node ip
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return:
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id: ip按点分割成四部分, 每部分转二进制后拼接再转十进制作为节点id
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"""
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ip_parts = ip.split(".")
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ip_int = 0
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for i in range(4):
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ip_int += int(ip_parts[i]) << (24 - (8 * i))
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# 获取当前时间
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current_time = int(time.time())
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# 插入数据
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cursor.execute(
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"INSERT INTO nodes (id, ip, last_heartbeat) VALUES (?, ?, ?)",
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(ip_int, ip, current_time),
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)
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conn.commit()
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return ip_int
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@app.get("/server/delete_node")
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async def delete_node(ip: str) -> None:
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"""
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param:
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ip: 待删除节点的ip地址
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return:
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None
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"""
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# 查询要删除的节点
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cursor.execute("SELECT * FROM nodes WHERE ip=?", (ip,))
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row = cursor.fetchone()
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if row is not None:
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# 执行删除操作
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cursor.execute("DELETE FROM nodes WHERE ip=?", (ip,))
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conn.commit()
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print(f"Node with IP {ip} deleted successfully.")
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else:
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print(f"Node with IP {ip} not found.")
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# 接收节点心跳包
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@app.get("/server/heartbeat")
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async def receive_heartbeat(ip: str):
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cursor.execute(
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"UPDATE nodes SET last_heartbeat = ? WHERE ip = ?", (time.time(), ip)
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)
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return {"status": "received"}
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async def receive_heartbeat_internal():
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while 1:
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timeout = 7
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# 删除超时的节点
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cursor.execute("DELETE FROM nodes WHERE last_heartbeat < ?", (time.time() - timeout,))
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conn.commit()
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await asyncio.sleep(timeout)
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@app.get("/server/send_nodes_list")
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async def send_nodes_list(count: int) -> list:
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"""
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中心服务器与客户端交互, 客户端发送所需节点个数, 中心服务器从数据库中顺序取出节点封装成list格式返回给客户端
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params:
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count: 所需节点个数
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return:
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nodes_list: list
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"""
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nodes_list = []
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# 查询数据库中的节点数据
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cursor.execute("SELECT * FROM nodes LIMIT ?", (count,))
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rows = cursor.fetchall()
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for row in rows:
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id, ip, last_heartbeat = row
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nodes_list.append(ip)
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return nodes_list
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# @app.get("/server/clear_database")
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def clear_database() -> None:
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cursor.execute("DELETE FROM nodes")
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conn.commit()
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if __name__ == "__main__":
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import uvicorn # pylint: disable=e0401
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uvicorn.run("server:app", host="0.0.0.0", port=8000, reload=True)
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