使用flask，uwsgi，nginx写一个中转请求的服务，安装、代码、部署全流程

安装flask及环境

1.使用虚拟环境

mkdir transfer
cd transfer
python3 -m venv .venv

激活虚拟环境

. .venv/bin/activate

在虚拟环境中安装

pip install Flask
pip install requests
pip install pyuwsgi

2.代码描述，接受一个请求，然后将请求的内容转发到另一个地址上，并返回相应结果。vim transfer.py

from flask import Flask, request
import requests

app = Flask(__name__)

@app.route('/transfer', methods=['GET', 'POST'])
def transfer():
    data = request.get_json()
    method = data.get('method')
    url = data.get('url')
    headers = data.get('headers')
    postdata = data.get('postdata')
    response = requests.request(method=method, url=url, headers=headers, data=postdata)
    return response.content


@app.route('/', methods=['GET', 'POST'])
def index():
    return 'hello world'


if __name__ == '__main__':
    app.run()

3.测试运行

export FLASK_APP=transfer #文件名称，如果文件名为 app.py 或者 wsgi.py ，那么不需要设置 FLASK_APP 环境变量
flask run

4.uwsgi启动

创建wsgi.py

from transfer import app as application

启动uwsgi 

#前台运行
uwsgi -s :8801 -b 8192 --master -p 1 --threads 2 --virtualenv /home/ubuntu/www/transfer/.venv  --wsgi-file wsgi.py

#后台运行
uwsgi -s :8801 -b 8192 --master -p 1 --threads 2 --virtualenv /home/ubuntu/www/transfer/.venv  --wsgi-file wsgi.py --daemonize /dev/null 

也可以将启动命令放入脚本中，方便使用

PORT=8801  #
PROCESS=1
THREADS=2


FILEPATH=$(cd "$(dirname "$0")"; pwd)

UWSGI_FILE=$FILEPATH/wsgi.py
PIDS=`ps -ef |grep $UWSGI_FILE |grep -v grep | awk '{print $2}'` 

if [ ! $1 ] || [ "$1" == 'false' ]; then
    if [ "$PIDS" != "" ]; then
        kill -7 $PIDS
        echo 'kill process...'
    else
        if [ "$1" == 'false' ];then
            uwsgi -s :$PORT -b 8192 --master -p $PROCESS --threads $THREADS --virtualenv $FILEPATH/.venv    --wsgi-file $UWSGI_FILE 
        else
            uwsgi -s :$PORT -b 8192 --master -p $PROCESS --threads $THREADS --virtualenv $FILEPATH/.venv  --wsgi-file $UWSGI_FILE --daemonize /dev/null 

            echo 'start success'
        fi  
    fi  
fi

5.nginx配置

server {
    listen       80;
    server_name test.com;
    location / {
        uwsgi_pass 127.0.0.1:8801;
        uwsgi_read_timeout 120s;
        include uwsgi_params;
    }
}

6.重启nginx

service nginx reload