from werkzeug.wsgi import DispatcherMiddleware

from werkzeug.serving import run_simple

from flask import Flask, current_app

app1 = Flask('app01')

app2 = Flask('app02')

@app1.route('/index')

def index():

    return "app01"

@app2.route('/index2')

def index2():

    return "app2"

# app1匹配路由时不需要前缀，app2匹配路由时要加上/sec前缀

dm = DispatcherMiddleware(app1, {

    '/sec': app2,

})

# 得到的这个dm对象没有run方法

# 所以要用run_simple

if __name__ == "__main__":

    app2.__call__

    run_simple('localhost', 5000, dm)

class DispatcherMiddleware(object):

    def __init__(self, app, mounts=None):

        # dm = DispatcherMiddleware(

        #       app1,

        # {  '/sec': app2,})

        # 所以app就是app1，mounts就是{  '/sec': app2,}

        self.app = app

        self.mounts = mounts or {}

    def __call__(self, environ, start_response):

        # 得到当前请求对应的url，比如、/sec/index

        # 第二种情况，app1对应的url，比如/index没有前缀

        # 那么while只循环一次就推出了

        script = environ.get('PATH_INFO', '')

        path_info = ''

        # 循环判断/是否在url中

        # 第二次循环script就变成/sec了

        while '/' in script:

            # 第一次进来时这个条件不成立,mounts={"/sec":app2}

            # 第二次进来时条件成立

            if script in self.mounts:

                # 获取到的app就是app2

                app = self.mounts[script]

                break

            # 将url按/右分割，得到script是/sec，last_item是index

            script, last_item = script.rsplit('/', 1)

            # 拼接url，得到path_info就是/index

            path_info = '/%s%s' % (last_item, path_info)

        else:

            # while循环结束后依照字典中对应的url前缀取出app2

            # 第二种情况while循环结束后，字典中没有对应的url前缀，所以就用默认值self.app就是app1

            app = self.mounts.get(script, self.app)

        original_script_name = environ.get('SCRIPT_NAME', '')

        environ['SCRIPT_NAME'] = original_script_name + script

        environ['PATH_INFO'] = path_info

        # app即是app2，加括号，执行对象的__call__方法，也就是Flask的__call__方法，从这里开始就是我们熟悉的了

        # 第二种情况url没有前缀这里的app就是app1

        return app(environ, start_response)

from flask import Flask, current_app, globals, _app_ctx_stack

app1 = Flask('app01')

app1.debug = False  # 用户/密码/邮箱

app2 = Flask('app02')

app2.debug = True  # 用户/密码/邮箱

# 这样嵌套的app，stack属性列表中就不会只有一个值了，

with app1.app_context():  # __enter__方法 -> push -> app_ctx添加到_app_ctx_stack.local

    # {<greenlet.greenlet object at 0x00000000036E2340>: {'stack': [<flask.ctx.AppContext object at 0x00000000037CA438>]}}

    print(_app_ctx_stack._local.__storage__)

    print(current_app.config['DEBUG'])

    with app2.app_context():

        # {<greenlet.greenlet object at 0x00000000036E2340>: {'stack': [<flask.ctx.AppContext object at 0x00000000037CA438> ]}}

        print(_app_ctx_stack._local.__storage__)

        print(current_app.config['DEBUG'])

    print(current_app.config['DEBUG'])