In diesem Artikel werden 200 Codezeilen verwendet, um ein asynchrones, nicht blockierendes Miniatur-Webframework zu vervollständigen: Snow. Es hat einen sehr guten Referenzwert, werfen wir einen Blick mit dem Editor unten
Unter den Web-Frameworks von Python ist Tornado für seine asynchrone Nichtblockierung bekannt. In diesem Artikel werden 200 Codezeilen verwendet, um ein asynchrones, nicht blockierendes Miniatur-Webframework zu vervollständigen: Snow.
1. Quellcode
Dieser Artikel basiert auf nicht-blockierendem Socket- und IO-Multiplexing, um ein asynchrones, nicht-blockierendes Web-Framework zu implementieren, darunter viele asynchrone, nicht blockierende -blockierende Web-Frameworks Interne Prinzipien des Frameworks.
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import re
import socket
import select
import time
class HttpResponse(object):
"""
封装响应信息
"""
def init(self, content=''):
self.content = content
self.headers = {}
self.cookies = {}
def response(self):
return bytes(self.content, encoding='utf-8')
class HttpNotFound(HttpResponse):
"""
404时的错误提示
"""
def init(self):
super(HttpNotFound, self).init('404 Not Found')
class HttpRequest(object):
"""
用户封装用户请求信息
"""
def init(self, conn):
self.conn = conn
self.header_bytes = bytes()
self.header_dict = {}
self.body_bytes = bytes()
self.method = ""
self.url = ""
self.protocol = ""
self.initialize()
self.initialize_headers()
def initialize(self):
header_flag = False
while True:
try:
received = self.conn.recv(8096)
except Exception as e:
received = None
if not received:
break
if header_flag:
self.body_bytes += received
continue
temp = received.split(b'\r\n\r\n', 1)
if len(temp) == 1:
self.header_bytes += temp
else:
h, b = temp
self.header_bytes += h
self.body_bytes += b
header_flag = True
@property
def header_str(self):
return str(self.header_bytes, encoding='utf-8')
def initialize_headers(self):
headers = self.header_str.split('\r\n')
first_line = headers[0].split(' ')
if len(first_line) == 3:
self.method, self.url, self.protocol = headers[0].split(' ')
for line in headers:
kv = line.split(':')
if len(kv) == 2:
k, v = kv
self.header_dict[k] = v
class Future(object):
"""
异步非阻塞模式时封装回调函数以及是否准备就绪
"""
def init(self, callback):
self.callback = callback
self._ready = False
self.value = None
def set_result(self, value=None):
self.value = value
self._ready = True
@property
def ready(self):
return self._ready
class TimeoutFuture(Future):
"""
异步非阻塞超时
"""
def init(self, timeout):
super(TimeoutFuture, self).init(callback=None)
self.timeout = timeout
self.start_time = time.time()
@property
def ready(self):
current_time = time.time()
if current_time > self.start_time + self.timeout:
self._ready = True
return self._ready
class Snow(object):
"""
微型Web框架类
"""
def init(self, routes):
self.routes = routes
self.inputs = set()
self.request = None
self.async_request_handler = {}
def run(self, host='localhost', port=9999):
"""
事件循环
:param host:
:param port:
:return:
"""
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind((host, port,))
sock.setblocking(False)
sock.listen(128)
sock.setblocking(0)
self.inputs.add(sock)
try:
while True:
readable_list, writeable_list, error_list = select.select(self.inputs, [], self.inputs,0.005)
for conn in readable_list:
if sock == conn:
client, address = conn.accept()
client.setblocking(False)
self.inputs.add(client)
else:
gen = self.process(conn)
if isinstance(gen, HttpResponse):
conn.sendall(gen.response())
self.inputs.remove(conn)
conn.close()
else:
yielded = next(gen)
self.async_request_handler[conn] = yielded
self.polling_callback()
except Exception as e:
pass
finally:
sock.close()
def polling_callback(self):
"""
遍历触发异步非阻塞的回调函数
:return:
"""
for conn in list(self.async_request_handler.keys()):
yielded = self.async_request_handler[conn]
if not yielded.ready:
continue
if yielded.callback:
ret = yielded.callback(self.request, yielded)
conn.sendall(ret.response())
self.inputs.remove(conn)
del self.async_request_handler[conn]
conn.close()
def process(self, conn):
"""
处理路由系统以及执行函数
:param conn:
:return:
"""
self.request = HttpRequest(conn)
func = None
for route in self.routes:
if re.match(route[0], self.request.url):
func = route[1]
break
if not func:
return HttpNotFound()
else:
return func(self.request)
snow.py2. Verwendung
1. Grundlegende Verwendung
from snow import Snow from snow import HttpResponse def index(request): return HttpResponse('OK') routes = [ (r'/index/', index), ] app = Snow(routes) app.run(port=8012)
2. Asynchrone Nicht-Blockierung: Zeitüberschreitung
from snow import Snow from snow import HttpResponse from snow import TimeoutFuture request_list = [] def async(request): obj = TimeoutFuture(5) yield obj def home(request): return HttpResponse('home') routes = [ (r'/home/', home), (r'/async/', async), ] app = Snow(routes) app.run(port=8012)
3. Asynchrone Nicht-Blockierung: Warten
Benutzerdefinierte Vorgänge können basierend auf dem Wartemodus abgeschlossen werden
from snow import Snow from snow import HttpResponse from snow import Future request_list = [] def callback(request, future): return HttpResponse(future.value) def req(request): obj = Future(callback=callback) request_list.append(obj) yield obj def stop(request): obj = request_list[0] del request_list[0] obj.set_result('done') return HttpResponse('stop') routes = [ (r'/req/', req), (r'/stop/', stop), ] app = Snow(routes) app.run(port=8012)
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