问题描述
我对编程和 Python 非常陌生,我使用 FastAPI 创建了一个 API,我需要在 Windows 上运行它,我想将它作为服务运行。服务器将启动并运行良好,但是当我尝试停止它时,Windows 会抛出一个错误,我认为这是因为我没有“停止”uvicorn,我不知道该怎么做。我一直在谷歌搜索并尝试在守护进程线程中运行 Uvicorn,因为我读到守护线程将在主线程退出时关闭,但这也无济于事。 我使用 cx_Freeze 将应用程序转换为 exe。有人能指出我正确的方向吗?
我将这个模板用于 cx_Freeze:https://github.com/marcelotduarte/cx_Freeze/tree/main/cx_Freeze/samples/service
我使用的是 Windows 10、Python 3.9.1、Uvicorn 0.13.3、cx_Freeze 6.5
ServiceHandler.py
import os
import sys
import cx_Logging
import api
import logging
import threading
from uvicorn import Config,Server
logging.basicConfig(
filename = os.path.join(os.path.dirname(sys.executable),"log.txt"),level = logging.DEBUG,format = '[API] %(levelname)-7.7s %(message)s'
)
class Handler:
# no parameters are permitted; all configuration should be placed in the
# configuration file and handled in the initialize() method
def __init__(self):
self.stopEvent = threading.Event()
self.stopRequestedEvent = threading.Event()
# called when the service is starting
def initialize(self,configFileName):
self.directory = os.path.dirname(sys.executable)
cx_Logging.StartLogging(os.path.join(self.directory,"testing.log"),cx_Logging.DEBUG)
#pass
# called when the service is starting immediately after initialize()
# use this to perform the work of the service; don't forget to set or check
# for the stop event or the service GUI will not respond to requests to
# stop the service
def run(self):
cx_Logging.Debug("stdout=%r",sys.stdout)
sys.stdout = open(os.path.join(self.directory,"stdout.log"),"a")
sys.stderr = open(os.path.join(self.directory,"stderr.log"),"a")
self.main()
self.stopRequestedEvent.wait()
self.stopEvent.set()
# called when the service is being stopped by the service manager GUI
def stop(self):
try:
logging.debug("Stopping Service")
self.stopRequestedEvent.set()
self.stopEvent.wait()
# How to stop the server???
except Exception as e:
logging.error(e)
def main(self):
try:
self.config = Config(app=api.app,host="0.0.0.0",port=8004,reload=False)
self.app_server = Server(self.config)
self.app_server.install_signal_handlers = lambda: None # Need this line,or the server wont start
self.app_server.run()
except Exception as e:
logging.error(e)
setup.py
from cx_Freeze import setup,Executable
options = {
"build_exe": {
"packages": ["uvicorn","fastapi","pydantic","threading"],"includes": ["ServiceHandler","cx_Logging","ipaddress","colorsys"],"excludes": ["tkinter"],}
}
executables = [
Executable(
"Config.py",base="Win32Service",target_name="api.exe",)
]
setup(
name="TestService",version="0.1",description="Sample Windows serice",executables=executables,options=options,)
我也读过这个; https://github.com/encode/uvicorn/issues/742 但是我的知识有限,所以我不太明白如何在我的应用程序中实现它?
解决方法
所以我得到了服务。 Uvicorn/FastAPI 现在将作为 Windows 服务启动和停止,我不知道是否有任何潜在的缺点,但这里是工作代码;
import os
import sys
import cx_Logging
import api
import logging
import threading
from uvicorn import Config,Server
logging.basicConfig(
filename = os.path.join(os.path.dirname(sys.executable),"log.txt"),level = logging.DEBUG,format = '[API] %(levelname)-7.7s %(message)s'
)
#My class for creating and running Uvicorn in a thread
class AppServer:
def __init__(self,app,host: str = "0.0.0.0",port: int = 8004,reload: bool = False):
self.config = Config(app=app,host=host,port=port,reload=reload)
self.server = Server(self.config)
self.server.install_signal_handlers = lambda: None # Need this line,or the server wont start
self.proc = None
def run(self):
self.server.run()
def start(self):
self.proc = threading.Thread(target=self.run,name="Test",args=())
self.proc.setDaemon(True)
self.proc.start()
def stop(self):
if self.proc:
self.proc.join(0.25)
class Handler:
# no parameters are permitted; all configuration should be placed in the
# configuration file and handled in the initialize() method
def __init__(self):
self.stopEvent = threading.Event()
self.stopRequestedEvent = threading.Event()
# called when the service is starting
def initialize(self,configFileName):
self.directory = os.path.dirname(sys.executable)
cx_Logging.StartLogging(os.path.join(self.directory,"testing.log"),cx_Logging.DEBUG)
#pass
# called when the service is starting immediately after initialize()
# use this to perform the work of the service; don't forget to set or check
# for the stop event or the service GUI will not respond to requests to
# stop the service
def run(self):
cx_Logging.Debug("stdout=%r",sys.stdout)
sys.stdout = open(os.path.join(self.directory,"stdout.log"),"a")
sys.stderr = open(os.path.join(self.directory,"stderr.log"),"a")
self.main()
self.stopRequestedEvent.wait()
self.stopEvent.set()
# called when the service is being stopped by the service manager GUI
def stop(self):
try:
logging.debug("Stopping Service")
self.server.stop()
self.stopRequestedEvent.set()
self.stopEvent.wait()
# How to stop the server???
except Exception as e:
logging.error(e)
def main(self):
try:
logging.debug("Starting server,")
self.server = AppServer(app=api.app)
self.server.start()
except Exception as e:
logging.error(e)
我在这里得到了答案; How to use FastAPI and uvicorn.run without blocking the thread?