1.web服务基本流程
1)client
首先客户端请求服务资源，
2)nginx
nginx作为直接对外的服务接口,接收到客户端发送过来的http请求,会解包、分析，
如果是静态文件请求就根据nginx配置的静态文件目录，返回请求的资源，
如果是动态的请求,nginx就通过配置文件,将请求传递给uWSGI；
3)uWSGI
uWSGI 将接收到的包进行处理，并转发给wsgi，
4)wsgi
wsgi根据请求调用django, flask工程的某个文件或函数，
5)web application
处理完后django,flask将返回值交给wsgi，
6)wsgi
wsgi将返回值进行打包，转发给uWSGI，
7)uWSGI
uWSGI接收后转发给nginx,
8)nginx
nginx最终将返回值返回给客户端(如浏览器)。
2.nginx配制
- flask_nginx.conf
- sudo ln -s /home/wyz/flask_nginx.conf /etc/nginx/conf.d/
- service nginx start/stop/restart
- ps -ef | grep nginx
server {
listen 80; //默认的web访问端口
server_name xxxxxx; //服务器名
#charset koi8-r;
access_log /home/wyz/flask/logs/access.log; //服务器接收的请求日志，logs目录若不存在需要创建，否则nginx报错
error_log /home/wyz/flask/logs/error.log; //错误日志
location / {
include uwsgi_params; //这里是导入的uwsgi配置
uwsgi_pass 127.0.0.1:5051; //需要和uwsgi的配置文件里socket项的地址
//相同,否则无法让uwsgi接收到请求。
uwsgi_param UWSGI_CHDIR /home/wyz/flask; //项目根目录
uwsgi_param UWSGI_PYTHON /home/wyz/flask/env36 //python虚拟环境
uwsgi_param UWSGI_SCRIPT manage:app; //启动项目的主程序(在本地上运行
//这个主程序可以在flask内置的
//服务器上访问你的项目)
}
}
3.uWSGI配制
- flask_uwsgi.ini
- uwsgi --ini /home/wyz/flask/flask_uwsgi.ini
- ps -ef | grep uwsgi
[uwsgi]
socket = 127.0.0.1:5051
#http = 127.0.0.1:5051
pythonpath = /home/wyz/flask
module = manage
wsgi-file = /home/wyz/flask/manage.py
callable = app
master = true
processes = 4
#threads = 2
daemonize = /home/wyz/flask/server.log
4.flask web应用
实现接收上传文件，并存放在upload目录下
from werkzeug.utils import secure_filename
from flask import Flask,render_template,jsonify,request
import time
import os
import base64
app = Flask(__name__)
UPLOAD_FOLDER='upload'
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
basedir = os.path.abspath(os.path.dirname(__file__))
ALLOWED_EXTENSIONS = set(['txt','png','jpg','xls','JPG','PNG','xlsx','gif','GIF'])
# 用于判断文件后缀
def allowed_file(filename):
return '.' in filename and filename.rsplit('.',1)[1] in ALLOWED_EXTENSIONS
# 用于测试上传，稍后用到
@app.route('/test/upload')
def upload_test():
return render_template('upload.html')
# 上传文件
@app.route('/api/upload',methods=['POST'],strict_slashes=False)
def api_upload():
file_dir=os.path.join(basedir,app.config['UPLOAD_FOLDER'])
if not os.path.exists(file_dir):
os.makedirs(file_dir)
f=request.files['myfile'] # 从表单的file字段获取文件，myfile为该表单的name值
if f and allowed_file(f.filename): # 判断是否是允许上传的文件类型
fname=secure_filename(f.filename)
print fname
ext = fname.rsplit('.',1)[1] # 获取文件后缀
unix_time = int(time.time())
new_filename=str(unix_time)+'.'+ext # 修改了上传的文件名
f.save(os.path.join(file_dir,new_filename)) #保存文件到upload目录
token = base64.b64encode(new_filename)
print token
return jsonify({"errno":0,"errmsg":"上传成功","token":token})
else:
return jsonify({"errno":1001,"errmsg":"上传失败"})
if __name__ == '__main__':
app.run(debug=True)
