From d31296d87f86ca817b6d7c41c46bc83fe403a093 Mon Sep 17 00:00:00 2001
From: Andrew <saintruler@gmail.com>
Date: Tue, 28 May 2019 21:58:51 +0400
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---
 day7/router.py | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 day7/router.py

(limited to 'day7/router.py')

diff --git a/day7/router.py b/day7/router.py
new file mode 100644
index 0000000..b0705c3
--- /dev/null
+++ b/day7/router.py
@@ -0,0 +1,87 @@
+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_tree.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_tree:
+        if route.check_route(url, method):
+            res = route.invoke_callback(url, method, request['query'])
+            break
+
+    return add_text_headers(*res)
+
+
+_router_tree = [
+    # 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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