Flask - 多APP应用

目录

一、简单使用

二、 源码分析

---

一、简单使用

总结：可以使用蓝图的路由分发实现，无需一定使用DispatcherMiddleware对象

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"

# http://www.oldboyedu.com/index
# http://www.oldboyedu.com/sec/index2
dm = DispatcherMiddleware(app1, {
    '/sec': app2,
})

if __name__ == "__main__":
    run_simple('localhost', 5000, dm)

二、 源码分析

允许在WSGI应用程序中挂载中间件或应用程序。如果您想组合多个WSGI应用程序，这非常有用

class DispatcherMiddleware(object):

    """Allows one to mount middlewares or applications in a WSGI application.
    This is useful if you want to combine multiple WSGI applications::

        app = DispatcherMiddleware(app, {
            '/app2':        app2,
            '/app3':        app3
        })
    """

    def __init__(self, app, mounts=None):
        self.app = app
        self.mounts = mounts or {}

    def __call__(self, environ, start_response):
        script = environ.get('PATH_INFO', '')
        path_info = ''
        while '/' in script:
            if script in self.mounts:
                app = self.mounts[script]
                break
            script, last_item = script.rsplit('/', 1)
            path_info = '/%s%s' % (last_item, path_info)
        else:
            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
        return app(environ, start_response)