如何解决瓶子服务器:删除路线
我想在我的瓶子服务器运行时添加和删除路由。
我的一般问题:是否有删除路由的正确方法?
换句话说:我该如何撤消对app.route
所做的操作?
在下文中,我将更详细地描述我的问题。如果您知道我的一般问题的答案,请不要浪费时间阅读它。
这是一个演示脚本,描述了我如何解决问题:
如果致电 GET / add :添加了“ Hello World”路线
如果调用 GET / remove (获取/删除):所有具有相同前缀(例如'Hello World'路线)的路线都会触发 404错误
import bottle
from bottle import redirect,abort
def addRoute():
app.route('/route/hello')(lambda :'Hello World')
print('Routes after calling /add:\n' + '\n'.join([str(route) for route in app.routes]))
redirect('route/hello')
def removeRoute():
prefix = '/route/hello'
#making a list of all routes having the prefix
#because this is a testfile there is only one rule that startswith prefix
routes = [route for route in app.routes if route.rule.startswith(prefix)]
#because there could be multiple routes with the same rule and method,#making a list without duplicates
ruleMethodTuples = list(dict.fromkeys([(route.rule,route.method) for route in routes]))
for ruleMethod in ruleMethodTuples :
#Workaround: Overwriting the existing route with a 404
#Here I'd prefer to make a statement that removes the existing route instead,#so the default 404 would be called
app.route(ruleMethod[0],method = ruleMethod[1])(lambda **kwords: abort(404,'Route deleted'))
print('Routes after calling /remove:\n' + '\n'.join([str(route) for route in app.routes]))
redirect('/route/hello')
if __name__ == '__main__':
app = bottle.app()
app.route('/add')(addRoute)
app.route('/remove')(removeRoute)
print('Initial routes:\n' + '\n'.join([str(route) for route in app.routes]))
bottle.run(app,host = 'localhost',port = 8080)
因此,这是启动并调用后的输出:
/添加
/删除
/添加
显示每次呼叫后 app.routes 中的路由。
Initial routes:
<GET '/add' <function addRoute at 0x02A876A8>>
<GET '/remove' <function removeRoute at 0x00F5F420>>
Bottle v0.12.17 server starting up (using WSGIRefServer())...
Listening on http://localhost:8080/
Hit Ctrl-C to quit.
Routes after calling /add:
<GET '/add' <function addRoute at 0x02A876A8>>
<GET '/remove' <function removeRoute at 0x00F5F420>>
<GET '/route/hello' <function addRoute.<locals>.<lambda> at 0x030C3E88>>
127.0.0.1 - - [25/Aug/2020 23:19:09] "GET /add HTTP/1.1" 303 0
127.0.0.1 - - [25/Aug/2020 23:19:09] "GET /route/hello HTTP/1.1" 200 11
Routes after calling /remove:
<GET '/add' <function addRoute at 0x02A876A8>>
<GET '/remove' <function removeRoute at 0x00F5F420>>
<GET '/route/hello' <function addRoute.<locals>.<lambda> at 0x030C3E88>>
<GET '/route/hello' <function removeRoute.<locals>.<lambda> at 0x030C3FA8>>
127.0.0.1 - - [25/Aug/2020 23:19:14] "GET /remove HTTP/1.1" 303 0
127.0.0.1 - - [25/Aug/2020 23:19:14] "GET /route/hello HTTP/1.1" 404 720
Routes after calling /add:
<GET '/add' <function addRoute at 0x02A876A8>>
<GET '/remove' <function removeRoute at 0x00F5F420>>
<GET '/route/hello' <function addRoute.<locals>.<lambda> at 0x030C3E88>>
<GET '/route/hello' <function removeRoute.<locals>.<lambda> at 0x030C3FA8>>
<GET '/route/hello' <function addRoute.<locals>.<lambda> at 0x030E0270>>
127.0.0.1 - - [25/Aug/2020 23:19:17] "GET /add HTTP/1.1" 303 0
127.0.0.1 - - [25/Aug/2020 23:19:18] "GET /route/hello HTTP/1.1" 200 11
因此,代替了 GET'/ route / hello',呼叫: app.route 使用相同的方法添加了更多路由,并且规则在列表的末尾。
到目前为止,这仍然有效,因为首先选择了最新的匹配路由,但是我敢肯定,这会(早晚)导致性能问题或在调用某些 / add后导致服务器崩溃 strong>和 /删除。
我还注意到,我可以更改 app.routes 而无需更改实际路由,因此第二个问题:
我是否可以从app.routes中删除“已弃用”的路由以防止堆栈溢出?
第三个问题:
我是否正在以完全错误的方式进行操作?
解决方法
我检查了add_route的源代码
它将route
添加到两个对象:self.routes
和self.router
(app.routes
和app.router
),这会带来问题。
def add_route(self,route):
""" Add a route object,but do not change the :data:`Route.app`
attribute."""
self.routes.append(route)
self.router.add(route.rule,route.method,route,name=route.name)
if DEBUG: route.prepare()
self.router
是对象Router,具有rules
,builder
,static
dyna_routes
,dyna_regexes
如果在添加新路线之前和之后进行检查,则会看到builder
和static
中的变化。
def addRoute():
print('--- before ---')
print(app.router.rules)
print(app.router.builder)
print(app.router.static)
print(app.router.dyna_routes)
app.route('/route/hello')(lambda :'Hello World')
print('--- after ---')
print(app.router.rules)
print(app.router.builder)
print(app.router.static)
print(app.router.dyna_routes)
print('Routes after calling /add:\n' + '\n'.join([str(route) for route in app.routes]))
redirect('route/hello')
如果我从'/route/hello'
和builder
中删除了static
,则'/route/hello'
停止工作,但是app.routes
仍然显示了它们,因此您必须删除{{1} } '/route/hello'
和app.routes
中的}-但它们没有特殊的功能:)
app.router
我的完整代码:
def removeRoute():
prefix = '/route/hello'
del app.router.builder[prefix]
del app.router.static['GET'][prefix]
print('Routes after calling /remove:\n' + '\n'.join([str(route) for route in app.routes]))
redirect('/route/hello')
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