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import re
from utils import NOT_FOUND, add_text_headers, HTTP_METHODS
import db
from backend import *
class Route:
def __init__(self, callback, url_format, methods=None):
self.methods = ['GET'] if methods is None else methods
self.url_pattern = re.compile(url_format)
self.callback = callback
def check_route(self, url, method):
match = self.url_pattern.fullmatch(url)
return bool(match) and len(match.groups()) == self.url_pattern.groups and method in self.methods
def invoke_callback(self, url, method, query):
match = self.url_pattern.fullmatch(url)
groups = match.groups()
matched = match and len(groups) == self.url_pattern.groups and method in self.methods
if not matched:
return NOT_FOUND, NOT_FOUND
return self.callback(query, *match.groups())
# url_format - регулярное выражение
def route(url_format, methods=None):
if methods is None:
methods = ['GET']
def wrapper(func):
def inner(url, query, *args, **kwargs):
pattern = re.compile(url_format)
match = re.fullmatch(pattern, url)
if match is None or len(match.groups()) != pattern.groups:
return NOT_FOUND, '404 NOT FOUND'
return func(query, *match.groups(), *args, **kwargs)
# Добавляем вызываемую функцию в дерево роутера.
# Благодаря этому указывать паттерн url и метод нужно указывать
# только в инициализаторе декоратора, а функция run сама разберется
# при каких условиях нужно вызвать конкретную функцию
_router_table.append(Route(func, url_format, methods))
return inner
return wrapper
def run(request):
res = NOT_FOUND, NOT_FOUND
for key, value in request['cookies'].items():
db.set_cookie(key, value)
method, url = request['method'], request['url']
for route in _router_table:
if route.check_route(url, method):
res = route.invoke_callback(url, method, request['query'])
break
return add_text_headers(*res)
_router_table = [
# Пока ничего лучше не придумал
Route(fallback_wrong_method, '/.*', list(set(HTTP_METHODS) ^ {'GET', 'POST'})),
Route(index_get, '/'),
Route(divide_get, r'/div/(\d+)/to/(\d+)/?'),
Route(divide_post, r'/div/?', ['POST']),
Route(show_errors_get, r'/show_errors/(\d{1})/?'),
Route(show_errors_post, r'/show_errors/?', ['POST']),
Route(set_cookie_get, r'/set_cookie/=/(.*)/?'),
Route(set_cookie_post, r'/set_cookie/=/?', ['POST']),
Route(short_log_get, r'/short_log/(\d{1})/?'),
Route(short_log_post, r'/short_log/?', ['POST']),
]
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