WSGI应用常见的几种写法

wsgi_app_style.py

from webob import Request
from webob import Response
from webob import exc
import pprint
 
def app6(environ, start_response):
    req = Request(environ)
    resp_body = ''
    for k,v in req.environ.iteritems():
        resp_body += '%s:%s\n' % (k,v)
    resp = Response(body=resp_body)
    return resp(environ, start_response)
 
def controller1(func):
    def application(environ,start_response):
        #do something else
        resp_body = func(environ)
        start_response("200 OK",[("Content-type","text/plain")])
        return resp_body
    return application
 
@controller1
def app7(environ):
    content = []
    for k,v in environ.iteritems():
        content.append('%s:%s \n' % (k,v))
    return content
    
    
 
def controller2(func):
    def replacement(environ, start_response):
        req = Request(environ)
        try:
            resp_body = func(req)
        except exc.HTTPException, e:
            resp_body = e
        resp = Response(body=resp_body)#body must be a string
        resp.status = '200 very OK'
        return resp(environ, start_response)
    return replacement
 
@controller2
def app8(req):
    ret = ''
    for k,v in req.environ.iteritems():
        ret = ret + '%s:%s \n' % (k,v)
    return ret
 
def controller3(cls):
    def replacement(environ, start_response):
        req = Request(environ)
        instance = cls(req, **req.urlvars)
        method = req.method
        if method == 'GET':       
            func = getattr(instance, method.lower())
            resp_body = func()
            if isinstance(resp_body, basestring):
                resp = Response(body=resp_body)
        return resp(environ,start_response)
    return replacement
 
class App9(object):
    def __init__(self,req,**args):
        self.req = req
    def get(self):
        body = ''
        for k,v in self.req.environ.iteritems():
            body += '%s"%s \n' % (k,v)
        return body
 
app9 = controller3(App9)
 
 
 
def app1(environ,start_response):
    start_response("200 OK",[("Content-type","text/plain")])
    content = []
    for k,v in environ.iteritems():
        content.append('%s:%s \n' % (k,v))
    return content
 
 
 
class app2(object):
    def __init__(self):
       pass
    def __call__(self,environ,start_response):
       start_response("200 OK",[("Content-type","text/plain")])
       content = []
       for k,v in environ.iteritems():
           content.append('%s:%s \n' % (k,v))
       return content
 
application = app2()
 
 
 
class app3(object):
    def __init__(self, environ, start_response):
        self.environ = environ
        self.start = start_response
 
    def __iter__(self):
        status = '200 OK'
        response_headers = [('Content-type', 'text/plain')]
        self.start(status, response_headers)
        content = ''
        for k,v in self.environ.iteritems():
            content += '%s:%s \n' % (k,v)
        yield content 
 
 
class app4(object):
    def __init__(self):
        pass
    @staticmethod
    def wsgi(environ,start_response):
        start_response("200 OK",[("Content-type","text/plain")])
        content = []
        for k,v in environ.iteritems():
            content.append('%s:%s \n' % (k,v))
        return content
 
class app5(object):
    def __init__(self):
        print 'This is app5'
        pass
    @classmethod
    def wsgi(cls,environ,start_response):
        start_response("200 OK",[("Content-type","text/plain")])
        #content = []
        #for k,v in environ.iteritems():
        #    content.append('%s:%s \n' % (k,v))
        #return content
        return "Hello World"
 
 
 
if __name__ == '__main__':
    from wsgiref.simple_server import make_server
    server = make_server('192.168.1.11', 7070, app9)
    server.serve_forever(