[py]彻底细究web框架的wsgi+逻辑处理模块

wsgi逻辑结构初探

web框架 = wsgi+逻辑处理app

接收请求,返回对应的内容

python wsgiref实现了wsgi规范.

from wsgiref.simple_server import make_server

def RunServer(environ, start_response):

    start_response('200 OK', [('Content-Type', 'text/html')])

    return "<h1>maotai</h1>"

if __name__ == '__main__':

    httpd = make_server('', 8080, RunServer)

    print 'http://127.0.0.1:8080'

    httpd.serve_forever()

访问http://127.0.0.1:8080

打断点,看下wsgi给environ传了什么参数: 里面包含url

实现不同的请求由不同的逻辑模块处理

from wsgiref.simple_server import make_server

def new():

    return "new"

def bbs():

    return "bbs"

urls = {

    "/new": new,

    "/bbs": bbs,

}

def RunServer(environ, start_response):

    start_response('200 OK', [('Content-Type', 'text/html')])

    # 获取url

    url = environ["PATH_INFO"]

    # 根据url路由

    if url == "/new":

        msg = new()

    elif url == "/bbs":

        msg = bbs()

    else:

        msg = "404"

    return msg

if __name__ == '__main__':

    httpd = make_server('', 8080, RunServer)

    print("http://127.0.0.1:8080")

    httpd.serve_forever()

优化urls写法

from wsgiref.simple_server import make_server

def new():

    return "new"

def bbs():

    return "bbs"

urls = {

    "/new": new,

    "/bbs": bbs

}

def RunServer(environ, start_response):

    start_response('200 OK', [('Content-Type', 'text/html')])

    url = environ["PATH_INFO"]

    # 当url在urls里时,获取到url对应的view名

    if url in urls.keys():

        func_name = urls[url]

        res = func_name()

    else:

        res = "404"

    return res

if __name__ == '__main__':

    httpd = make_server('', 8003, RunServer)

    print("http://127.0.0.1:8003")

    httpd.serve_forever()

将一整坨代码模块化-搞成mvc模式

拆分有2个原因:

项目大了,代码多了,拆分方便管理
拆分模块化简化复用

controller.py: 通过file操作,获取模板内容,返回

def new():

    # return "index"

    f=open("./index.html",'r')

    tmpl = f.read()

    f.close()

    return tmpl

def bbs():

    return "bbs"

urls.py

import controller

urls={

    "/new":controller.new,

    "/bbs":controller.bbs,

}

start.py

from wsgiref.simple_server import make_server

from urls import urls

def RunServer(environ, start_response):

    start_response('200 OK', [('Content-Type', 'text/html')])

    url = environ["PATH_INFO"]

    if url in urls.keys():

        msg = urls[url]()

    else:

        msg = "404"

    return msg

if __name__ == '__main__':

    httpd = make_server('', 8003, RunServer)

    print "http://127.0.0.1:8003"

    httpd.serve_forever()

template: 返回time到网页: 字符串replace

index.html

<body>

here is maotai's bbs

<h1>{{item}}</h1>

</body>

controller.py

思路: 使用字符串替换方法替换html中的指定字符

import os

import time

def bbs():

    f = open(os.path.join("views", "bbs.html"), 'r')

    html = f.read()

    f.close()

    html = html.replace("{{item}}", str(time.time()))

    return html

template: 使用jinjia2渲染模板

jinjia2使用参考

controller.py: 使用jinjia2渲染(字符串替换思路一样,只不过在html里支持循环等语法.)

import os

from jinja2 import Template

def bbs():

    f = open(os.path.join("views", "bbs.html"), 'r')

    html = f.read()

    f.close()

    tmp=Template(html)

    # 使用jinjia2渲染(字符串替换思路一样)

    html=tmp.render(name="maotai",user_list=['maotai','alice','cristin'])

    return html.encode("utf-8")

巴特西