fastapi 基本部署使用

基本包：

在centos7.6 下，安装了python3.8 版本，同时与python2 共存，因此安装fastapi的时候，应该使用pip3 进行安装

安装的模块：

			pip3 install fastapi
			pip3 install uvicron
			pip3 install gunicorn  #管理uvicron应用

基本main.py 文件

[root@iZh pytest]# cat main.py 
from fastapi import FastAPI
import uvicorn

app = FastAPI()

@app.get("/")
def read_root():
    return {"message":"ok"}

if __name__=='__main__':
    uvicorn.run(app='main:app',host="127.0.0.1",port=8000,reload=True,debug=True)

启动

1. python3 main.py 默认python为2的版本，系统自带不支持

[root@iZh pytest]# python main.py 
Traceback (most recent call last):
  File "main.py", line 1, in <module>
    from fastapi import FastAPI
ImportError: No module named fastapi
[root@iZhppytest]# python3 main.py 
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [9591] using statreload
INFO:     Started server process [9599]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

2. uvicorn main:app --reload

[root@iZh pytest]# uvicorn main:app --reload
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [9626] using statreload
INFO:     Started server process [9633]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

3.前两个都是阻塞式的，并且在控制台关闭之后，程序也就关闭了。使用gunicron 解决

gunicorn main:app -b 127.0.0.1:8000  -w 4 -k uvicorn.workers.UvicornH11Worker --daemon

关闭gunicron 进程
1. 查询进程pid

[root@iZh pytest]# pstree -ap|grep gunicorn
  |-gunicorn,9362 /usr/local/bin/gunicorn main:app -b 127.0.0.1:8000 -w 4 -k uvicorn.workers.UvicornH11Worker --daemon
  |-gunicorn,9363 /usr/local/bin/gunicorn main:app -b 127.0.0.1:8000 -w 4 -k uvicorn.workers.UvicornH11Worker --daemon
  |-gunicorn,9364 /usr/local/bin/gunicorn main:app -b 127.0.0.1:8000 -w 4 -k uvicorn.workers.UvicornH11Worker --daemon
  |-gunicorn,9365 /usr/local/bin/gunicorn main:app -b 127.0.0.1:8000 -w 4 -k uvicorn.workers.UvicornH11Worker --daemon
  |   `-{gunicorn},9377
  |           |-grep,9479 --color=auto gunicorn

2. 关闭进程

[root@iZhp3blin25ak7ob1v9hfeZ pytest]# kill -9 9362
[root@iZhp3blin25ak7ob1v9hfeZ pytest]# kill -9 9363
[root@iZhp3blin25ak7ob1v9hfeZ pytest]# kill -9 9364
[root@iZhp3blin25ak7ob1v9hfeZ pytest]# kill -9 9365

测试访问

使用curl测试工具进行测试：

 安装curl 工具：
     yum -y install  curl

 访问测试：
	curl 127.0.0.1：8000

[root@iZhp3b local]# curl 127.0.0.1:8000
{"message":"ok"}  #返回测试数据
[root@iZ local]# 

fastapi 多文件

1. 在项目目录下新建python包，例如orders包，即带有 init.py 文件的目录
2. 在python中新建普通的python文件：index.py
3. index.py 文件中导入fastapi的路由，使用路由进行api的配置

from fastapi import APIRouter

router = APIRouter()

#tags为表明这个方法的用途等等
@router.get('/index',tags=['myorder'])
async  def readOrders():
    return {"message":"allorders"}

4. 在项目入口文件中，将路由文件全部进行导入，并配置api路径

from fastapi import FastAPI
from order import index 
#导入router
app = FastAPI()

#配置router和api访问前缀路径
app.include_router(index.router,prefix="/order")

6. 调用方法与主入口中app修饰下的方法相同调用即可

127.0.0.1:8000/order/index 

fastapi 跨域设置

1. 使用中间件进行设置，入口文件中进行设置即可。 CORSMiddleware

from fastapi.middleware.cors import  CORSMiddleware

2. 基本配置，可跨域的域名，请求的方法等等

#可跨域访问的域名
origins = [
    "http://localhost",
    "http://localhost:8080",
]

#可跨域访问的基本请求设置
app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)