paste deploy python ini 配置文件简单说明

配合 http://www.python.org/dev/peps/pep-0333/
http://pythonpaste.org/deploy/
看下面的example（从网络上改造而来，出处URL也搞忘记的），很快会对python的paste如何组织wsgi有一个简单的了解，

pastedeploylab.ini

[DEFAULT]  
key1=value1  
key2=value2  
key3=values  
[composite:pdl]  
use=egg:Paste#urlmap  
/:root  
/calc:calc  
[filter:logrequest]  
username = root  
password = root123  
paste.filter_factory = pastedeploylab:LogFilter.factory  
[filter:testrequest]  
username = admin 
password = admin
paste.filter_factory = pastedeploylab:TestFilter.factory  

[app:calculator]  
description = This is an "+-*/" Calculator   
paste.app_factory = pastedeploylab:Calculator.factory  

[app:showversion]  
version = 1.0.0  
paste.app_factory = pastedeploylab:ShowVersion.factory  

[pipeline:root]  
pipeline = logrequest testrequest showversion 
[pipeline:calc]  
pipeline = logrequest calculator

pastedeployed.py

import os
import webob
from webob import Request
from webob import Response
from paste.deploy import loadapp
from wsgiref.simple_server import make_server

#Filter
class LogFilter():
    def __init__(self,app):
        self.app = app

    def __call__(self,environ,start_response):
        print "filter:LogFilter is called."
        return self.app(environ,start_response)

    @classmethod
    def factory(cls, global_conf, **kwargs):
        print "in LogFilter.factory", global_conf, kwargs
        return LogFilter


class TestFilter():
    def __init__(self,app):
        self.app = app

    def __call__(self,environ,start_response):
        print "filter:TestFilter is called."
        return self.app(environ,start_response)

    @classmethod
    def factory(cls, global_conf, **kwargs):
        print "in TestFilter.factory", global_conf, kwargs
        return TestFilter
    
class ShowVersion():
    def __init__(self):
        pass

    def __call__(self,environ,start_response):
        start_response("200 OK",[("Content-type", "text/plain")])
        return ["Paste Deploy LAB: Version = 1.0.0",]

    @classmethod
    def factory(cls,global_conf,**kwargs):
        print 
        print "in ShowVersion.factory:"
        print "global_conf=", global_conf
        print "kwargs     =", kwargs
        return ShowVersion()


class Calculator():
    def __init__(self):
        pass
    
    def __call__(self,environ,start_response):
        req = Request(environ)
        res = Response()
        res.status = "200 OK"
        res.content_type = "text/plain"
        # get operands
        operator = req.GET.get("operator", None)
        operand1 = req.GET.get("operand1", None)
        operand2 = req.GET.get("operand2", None)
        print req.GET
        opnd1 = int(operand1)
        opnd2 = int(operand2)
        if operator == u'plus':
            opnd1 = opnd1 + opnd2
        elif operator == u'minus':
            opnd1 = opnd1 - opnd2
        elif operator == u'star':
            opnd1 = opnd1 * opnd2
        elif operator == u'slash':
            opnd1 = opnd1 / opnd2
        res.body = "%s /nRESULT= %d" % (str(req.GET) , opnd1)
        return res(environ,start_response)
    @classmethod
    def factory(cls,global_conf,**kwargs):
        print "in Calculator.factory", global_conf, kwargs
        return Calculator()


if __name__ == '__main__':
    configfile="pastedeploylab.ini"
    appname="pdl"
    wsgi_app = loadapp("config:%s" % os.path.abspath(configfile), appname)
    server = make_server('localhost',8989,wsgi_app)
  

  server.serve_forever()