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打造 python web 框架 (三): Python WSGI 架构升级

本文主要讲web框架架构会有两种形式，一种装饰器和另外一种正则表达式实现路由。

装饰器

创建WSGI服务类

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class WSGIapp(object):
# 初始化路由routes
    def __init__(self):
        self.routes = {}
# routes 装饰器
    def route(self,path=None):
        def decorator(func):
            self.routes[path] = func
            return func
        return decorator
    # 执行wsgi方法，进行路由验证
    def __call__(self,environ,start_response):
        print 'call'
        return self.wsgi(environ,start_response)
 
    def wsgi(self,environ,start_response):
        path = environ['PATH_INFO'] # 获取路由地址
        print path
        if path in self.routes:
            status = '200 OK' # 返回状态200
            response_headers = [('Content-Type','text/plain')]
            start_response(status,response_headers)
            print self.routes[path]()
            return self.routes[path]() # 进行路由跳转
        else:
            status = '404 Not Found' # 访问当前地址不在路由数组里返回404
            response_headers = [('Content-Type','text/plain')]
            start_response(status,response_headers)
            return '404 Not Found!'

 

进行路由跳转

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app = WSGIapp() # 创建对象
app.route('/') # 创建路由
def index(): # 方法名不能重复
    return ['This is index'] # 返回信息
    
@app.route('/hello') # 创建路由
def hello():
    return ['hello'] # 返回信息

启动服务

 

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from wsgiref.simple_server import make_server
httpd = make_server('',8000,app)
print 'start....'
httpd.serve_forever()



完整代码

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class WSGIapp(object):
 
    def __init__(self):
        self.routes = {}
 
    def route(self,path=None):
        def decorator(func):
            self.routes[path] = func
            return func
        return decorator
    
    def __call__(self,environ,start_response):
        return self.wsgi(environ,start_response)
 
    def wsgi(self,environ,start_response):
        path = environ['PATH_INFO']
        print path
        if path in self.routes:
            status = '200 OK'
            response_headers = [('Content-Type','text/plain')]
            start_response(status,response_headers)
            print self.routes[path]()
            return self.routes[path]()
        else:
            status = '404 Not Found'
            response_headers = [('Content-Type','text/plain')]
            start_response(status,response_headers)
            return '404 Not Found!'
 
app = WSGIapp()
@app.route('/')
def index():
    return ['This is index']
    
@app.route('/hello')
def hello():
    return ['hello']
 
from wsgiref.simple_server import make_server
httpd = make_server('',8000,app)
print 'start....'
httpd.serve_forever()

 

运行
untitled

正则

创建WSGI服务类

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import re #导入模块
 
class WSGIapp:
    headers = []
    def __init__(self,urls=()):
        self.urls = urls
        self.status = '200 OK'
    def __call__(self,environ,start_response):
        x = self.mapping_urls(environ)
        start_response(self.status,self.headers)
        if isinstance(x,str):
            return iter([x])
        else:
            return iter(x)
    def mapping_urls(self,environ): # 进行正则路由查找
        path = environ['PATH_INFO'] # 获取路由地址
        for pattern,name in self.urls:
            m = re.match('^'+pattern+'$',path)
            if m:
                args = m.groups()
                func = globals()[name]
                return func(*args)
        return self.notfound()
    def notfound(self): # 找不到返回404
        self.status = '404 Not Found'
        self.headers = [('Content-Type','text/plain')]
        return '404 Not Found\n'
    @classmethod # 定义类方法
    def header(cls,name,value):
        cls.headers.append((name,value))

 

进行路由跳转,定义方法，通过正则匹配

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def GET_index(*args):
    WSGIapp.header('Content-Type','text/plain')
    return 'Welcome!\n'
 
def GET_hello(*args):
    WSGIapp.header('Content-Type','text/plain')
    return 'Hello %s!\n' % args
 
urls = [
    ('/','GET_index'),
    ('/hello/(.*)','GET_hello')
    ]
    
wsgiapp = WSGIapp(urls)

 

启动服务

 

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if __name__ == '__main__':
    from wsgiref.simple_server import make_server
    httpd = make_server('',8000,wsgiapp)
    print 'server starting...'
    httpd.serve_forever()


完整代码

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import re
 
class WSGIapp:
    headers = []
    def __init__(self,urls=()):
        self.urls = urls
        self.status = '200 OK'
    def __call__(self,environ,start_response):
        x = self.mapping_urls(environ)
        print x
        start_response(self.status,self.headers)
        if isinstance(x,str):
            return iter([x])
        else:
            return iter(x)
    def mapping_urls(self,environ):
        path = environ['PATH_INFO']
        for pattern,name in self.urls:
            m = re.match('^'+pattern+'$',path)
            if m:
                args = m.groups()
                func = globals()[name]
                return func(*args)
        return self.notfound()
    def notfound(self):
        self.status = '404 Not Found'
        self.headers = [('Content-Type','text/plain')]
        return '404 Not Found\n'
    @classmethod
    def header(cls,name,value):
        cls.headers.append((name,value))
 
 
def GET_index(*args):
    WSGIapp.header('Content-Type','text/plain')
    return 'Welcome!\n'
 
def GET_hello(*args):
    WSGIapp.header('Content-Type','text/plain')
    return 'Hello %s!\n' % args
 
urls = [
    ('/','GET_index'),
    ('/hello/(.*)','GET_hello')
    ]
    
wsgiapp = WSGIapp(urls)
if __name__ == '__main__':
    from wsgiref.simple_server import make_server
    httpd = make_server('',8000,wsgiapp)
    print 'server starting...'
    httpd.serve_forever()

 

运行
u1ntitled

5 thoughts on “打造 python web 框架 (三): Python WSGI 架构升级”

  1. MrHgx

    第一个装饰器的那个实现，怎么实现如下的例子啊：
    @app.route(‘XXX/a’)
    def a(args):
    print args
    然后对应url：localhost：8000/xxx/a/args

    回复
  2. MrHgx

    第一个装饰器的那个实现，怎么实现如下的例子啊：
    @app.route(‘XXX/a’)
    def a(args):
    print args
    然后对应url：localhost：8000/xxx/a/args

    回复
    1. 天才小三斤 天才小三斤

      继续往下看,下面几章有写。

      回复
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        回复
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      回复
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    回复
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