Tornado基本使用
1、快速上手
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world")
application = tornado.web.Application([
(r"/index", MainHandler),
])
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
第一步：執行腳本，監聽 8888 端口css
第二步：瀏覽器客戶端訪問 /index --> http://127.0.0.1:8888/indexhtml
第三步：服務器接受請求，並交由對應的類處理該請求python
第四步：類接受到請求以後，根據請求方式（post / get / delete ...）的不一樣調用並執行相應的方法jquery
第五步：方法返回值的字符串內容發送瀏覽器git
2、路由系統
路由系統其實就是 url 和 類 的對應關係，這裏不一樣於其餘框架，其餘不少框架均是 url 對應 函數，Tornado中每一個url對應的是一個類。程序員
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world")
class StoryHandler(tornado.web.RequestHandler):
def get(self, story_id):
self.write("You requested the story " + story_id)
class BuyHandler(tornado.web.RequestHandler):
def get(self):
self.write("buy.wupeiqi.com/index")
application = tornado.web.Application([
(r"/index", MainHandler),
(r"/story/([0-9]+)", StoryHandler),
])
application.add_handlers('buy.wupeiqi.com$', [
(r'/index',BuyHandler),
])
if __name__ == "__main__":
application.listen(80)
tornado.ioloop.IOLoop.instance().start()
3、模板
Tornao中的模板語言和django中相似，模板引擎將模板文件載入內存，而後將數據嵌入其中，最終獲取到一個完整的字符串，再將字符串返回給請求者。github
Tornado 的模板支持「控制語句」和「表達語句」，控制語句是使用 {% 和 %} 包起來的 例如 {% if len(items) > 2 %}。表達語句是使用 {{ 和 }} 包起來的，例如 {{ items[0] }}。web
控制語句和對應的 Python 語句的格式基本徹底相同。咱們支持 if、for、while 和 try，這些語句邏輯結束的位置須要用 {% end %} 作標記。還經過 extends 和 block 語句實現了模板繼承。這些在 template 模塊 的代碼文檔中有着詳細的描述。ajax
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <title>123456</title> <link href="{{static_url("css/common.css")}}" rel="stylesheet" /> {% block CSS %}{% end %} </head> <body> <div class="pg-header"> </div> {% block RenderBody %}{% end %} <script src="{{static_url("js/jquery-1.8.2.min.js")}}"></script> {% block JavaScript %}{% end %} </body> </html>
{% extends 'layout.html'%} {% block CSS %} <link href="{{static_url("css/index.css")}}" rel="stylesheet" /> <link href="/static/css/common.css" rel="stylesheet" /> {% end %} {% block RenderBody %} <h1>Index</h1> {% end %} {% block JavaScript %} {% end %}
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.render('index.html')
settings = {
'template_path': 'template',
'static_path': 'static',
'static_url_prefix': '/static/',
}
application = tornado.web.Application([
(r"/index", MainHandler),
], **settings)
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
在模板中默認提供了一些函數、字段、類以供模板使用：正則表達式
escape:tornado.escape.xhtml_escape的別名xhtml_escape:tornado.escape.xhtml_escape的別名url_escape:tornado.escape.url_escape的別名json_encode:tornado.escape.json_encode的別名squeeze:tornado.escape.squeeze的別名linkify:tornado.escape.linkify的別名datetime: Python 的datetime模組handler: 當前的RequestHandler對象request:handler.request的別名current_user:handler.current_user的別名locale:handler.locale的別名_:handler.locale.translate的別名static_url: forhandler.static_url的別名xsrf_form_html:handler.xsrf_form_html的別名
Tornado默認提供的這些功能其實本質上就是 UIMethod 和 UIModule，咱們也能夠自定義從而實現相似於Django的simple_tag的功能：
一、定義
# uimethods.py def tab(self): return 'UIMethod'
#!/usr/bin/env python # -*- coding:utf-8 -*- from tornado.web import UIModule from tornado import escape class custom(UIModule): def render(self, *args, **kwargs): return escape.xhtml_escape('<h1>chenchao</h1>')
二、註冊
#!/usr/bin/env python # -*- coding:utf-8 -*- #!/usr/bin/env python # -*- coding:utf-8 -*- import tornado.ioloop import tornado.web from tornado.escape import linkify import uimodules as md import uimethods as mt class MainHandler(tornado.web.RequestHandler): def get(self): self.render('index.html') settings = { 'template_path': 'template', 'static_path': 'static', 'static_url_prefix': '/static/', 'ui_methods': mt, 'ui_modules': md, } application = tornado.web.Application([ (r"/index", MainHandler), ], **settings) if __name__ == "__main__": application.listen(8009) tornado.ioloop.IOLoop.instance().start() main.py
三、使用
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <link href="{{static_url("commons.css")}}" rel="stylesheet" /> </head> <body> <h1>hello</h1> {% module custom(123) %} {{ tab() }} </body>
4、實用功能
一、靜態文件
對於靜態文件，能夠配置靜態文件的目錄和前段使用時的前綴，而且Tornaodo還支持靜態文件緩存。
#!/usr/bin/env python # -*- coding:utf-8 -*- import tornado.ioloop import tornado.web import uimodules as md import uimethods as mt class MainHandler(tornado.web.RequestHandler): def get(self): self.render('index.html') settings = { 'template_path': 'template', 'static_path': 'static', 'static_url_prefix': '/static/', 'ui_methods': mt, 'ui_modules': md, } application = tornado.web.Application([ (r"/index", MainHandler), ], **settings) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>123456</title>
<link href="{{static_url("css/common.css")}}" rel="stylesheet" />
</head>
<body>
<div class="pg-header">
<h1>Index</h1>
</div>
<script src="{{static_url("js/jquery-1.8.2.min.js")}}"></script>
</body>
</html>
備註：靜態文件緩存的實現
def get_content_version(cls, abspath): data = cls.get_content(abspath) hasher = hashlib.md5() if isinstance(data, bytes): hasher.update(data) else: for chunk in data: hasher.update(chunk) return hasher.hexdigest()
二、csrf
Tornado中的跨站請求僞造和Django中的類似，跨站僞造請求(Cross-site request forgery)
settings = { "xsrf_cookies": True, } application = tornado.web.Application([ (r"/", MainHandler), (r"/login", LoginHandler), ], **settings)
<form action="/new_message" method="post"> {{ xsrf_form_html() }} <input type="text" name="message"/> <input type="submit" value="Post"/> </form>
function getCookie(name) { var r = document.cookie.match("\\b" + name + "=([^;]*)\\b"); return r ? r[1] : undefined; } jQuery.postJSON = function(url, args, callback) { args._xsrf = getCookie("_xsrf"); $.ajax({url: url, data: $.param(args), dataType: "text", type: "POST", success: function(response) { callback(eval("(" + response + ")")); }}); };
注：Ajax使用時，本質上就是去獲取本地的cookie，攜帶cookie再來發送請求
三、cookie
Tornado中能夠對cookie進行操做，而且還能夠對cookie進行簽名以防止僞造。
a、基本操做
class MainHandler(tornado.web.RequestHandler): def get(self): if not self.get_cookie("mycookie"): self.set_cookie("mycookie", "myvalue") self.write("Your cookie was not set yet!") else: self.write("Your cookie was set!")
b、簽名
Cookie 很容易被惡意的客戶端僞造。加入你想在 cookie 中保存當前登錄用戶的 id 之類的信息，你須要對 cookie 做簽名以防止僞造。Tornado 經過 set_secure_cookie 和 get_secure_cookie 方法直接支持了這種功能。 要使用這些方法，你須要在建立應用時提供一個密鑰，名字爲 cookie_secret。 你能夠把它做爲一個關鍵詞參數傳入應用的設置中：
class MainHandler(tornado.web.RequestHandler): def get(self): if not self.get_secure_cookie("mycookie"): self.set_secure_cookie("mycookie", "myvalue") self.write("Your cookie was not set yet!") else: self.write("Your cookie was set!") application = tornado.web.Application([ (r"/", MainHandler), ], cookie_secret="61oETzKXQAGaYdkL5gEmGeJJFuYh7EQnp2XdTP1o/Vo=")
簽名Cookie的本質是：
寫cookie過程：
- 將值進行base64加密
- 對除值之外的內容進行簽名，哈希算法（沒法逆向解析）
- 拼接 簽名 + 加密值
讀cookie過程：
- 讀取 簽名 + 加密值
- 對簽名進行驗證
- base64解密，獲取值內容
注：許多API驗證機制和安全cookie的實現機制相同。
#!/usr/bin/env python # -*- coding:utf-8 -*- import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): login_user = self.get_secure_cookie("login_user", None) if login_user: self.write(login_user) else: self.redirect('/login') class LoginHandler(tornado.web.RequestHandler): def get(self): self.current_user() self.render('login.html', **{'status': ''}) def post(self, *args, **kwargs): username = self.get_argument('name') password = self.get_argument('pwd') if username == 'wupeiqi' and password == '123': self.set_secure_cookie('login_user', '陳超') self.redirect('/') else: self.render('login.html', **{'status': '用戶名或密碼錯誤'}) settings = { 'template_path': 'template', 'static_path': 'static', 'static_url_prefix': '/static/', 'cookie_secret': 'aiuasdhflashjdfoiuashdfiuh' } application = tornado.web.Application([ (r"/index", MainHandler), (r"/login", LoginHandler), ], **settings) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()
#!/usr/bin/env python # -*- coding:utf-8 -*- import tornado.ioloop import tornado.web class BaseHandler(tornado.web.RequestHandler): def get_current_user(self): return self.get_secure_cookie("login_user") class MainHandler(BaseHandler): @tornado.web.authenticated def get(self): login_user = self.current_user self.write(login_user) class LoginHandler(tornado.web.RequestHandler): def get(self): self.current_user() self.render('login.html', **{'status': ''}) def post(self, *args, **kwargs): username = self.get_argument('name') password = self.get_argument('pwd') if username == 'wupeiqi' and password == '123': self.set_secure_cookie('login_user', '陳超') self.redirect('/') else: self.render('login.html', **{'status': '用戶名或密碼錯誤'}) settings = { 'template_path': 'template', 'static_path': 'static', 'static_url_prefix': '/static/', 'cookie_secret': 'aiuasdhflashjdfoiuashdfiuh', 'login_url': '/login' } application = tornado.web.Application([ (r"/index", MainHandler), (r"/login", LoginHandler), ], **settings) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start()
5、擴展功能
一、自定義Session
a.知識儲備
類的特殊成員
#!/usr/bin/env python
# -*- coding:utf-8 -*-
class Foo(object):
def __getitem__(self, key):
print '__getitem__',key
def __setitem__(self, key, value):
print '__setitem__',key,value
def __delitem__(self, key):
print '__delitem__',key
obj = Foo()
result = obj['k1']
#obj['k2'] = 'chenchao'
#del obj['k1']
b.session實現機制
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import tornado.ioloop
import tornado.web
from hashlib import sha1
import os, time
session_container = {}
# 建立MD516進制的session_id
create_session_id = lambda: sha1('%s%s' % (os.urandom(16), time.time())).hexdigest()
class Session(object):
session_id = "__sessionId__" # 自定義session的key名稱
def __init__(self, request):
# 默認先從請求信息裏獲取自定義的cookie值
session_value = request.get_cookie(Session.session_id)
if not session_value:
self._id = create_session_id()
else:
self._id = session_value
# 設置cookie
request.set_cookie(Session.session_id, self._id)
def __getitem__(self, key):
return session_container[self._id][key]
def __setitem__(self, key, value):
if session_container.has_key(self._id):
session_container[self._id][key] = value
else:
session_container[self._id] = {key: value}
def __delitem__(self, key):
del session_container[self._id][key]
class BaseHandler(tornado.web.RequestHandler):
def initialize(self):
# 建立Session的對象，將MainHandler的對象傳入
self.my_session = Session(self)
# 繼承自定義的BaseHandler
class MainHandler(BaseHandler):
def get(self):
print self.my_session['c_user'] # 獲取session的值
print self.my_session['c_card']
self.write('index')
class LoginHandler(BaseHandler):
def get(self):
self.render('login.html', **{'status': ''})
def post(self, *args, **kwargs):
username = self.get_argument('name')
password = self.get_argument('pwd')
if username == 'chenchao' and password == '123':
# 設置session的值
self.my_session['c_user'] = 'chenchao'
self.my_session['c_card'] = '12312312309823012'
self.redirect('/index')
else:
self.render('login.html', **{'status': '用戶名或密碼錯誤'})
settings = {
'template_path': 'template',
'static_path': 'static',
'static_url_prefix': '/static/',
'cookie_secret': 'aiuasdhflashjdfoiuashdfiuh',
'login_url': '/login'
}
application = tornado.web.Application([
(r"/index", MainHandler),
(r"/login", LoginHandler),
], **settings)
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
二、自定義模型綁定
模型綁定有兩個主要功能：
- 自動生成html表單
- 用戶輸入驗證
在以前學習的Django中爲程序員提供了很是便捷的模型綁定功能，可是在Tornado中，一切須要本身動手！！！
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <link href="{{static_url("commons.css")}}" rel="stylesheet" /> </head> <body> <h1>hello</h1> <form action="/index" method="post"> <p>hostname: <input type="text" name="host" /> </p> <p>ip: <input type="text" name="ip" /> </p> <p>port: <input type="text" name="port" /> </p> <p>phone: <input type="text" name="phone" /> </p> <input type="submit" /> </form> </body> </html>
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import tornado.ioloop
import tornado.web
from hashlib import sha1
import os, time
import re
class MainForm(object):
def __init__(self):
self.host = "(.*)"
self.ip = "^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$"
self.port = '(\d+)'
self.phone = '^1[3|4|5|8][0-9]\d{8}$'
def check_valid(self, request):
form_dict = self.__dict__
for key, regular in form_dict.items():
post_value = request.get_argument(key)
# 讓提交的數據 和 定義的正則表達式進行匹配
ret = re.match(regular, post_value)
print key,ret,post_value
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.render('index.html')
def post(self, *args, **kwargs):
obj = MainForm()
result = obj.check_valid(self)
self.write('ok')
settings = {
'template_path': 'template',
'static_path': 'static',
'static_url_prefix': '/static/',
'cookie_secret': 'aiuasdhflashjdfoiuashdfiuh',
'login_url': '/login'
}
application = tornado.web.Application([
(r"/index", MainHandler),
], **settings)
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
因爲請求的驗證時，須要考慮是否能夠爲空以及正則表達式的複用，因此：
#!/usr/bin/env python # -*- coding:utf-8 -*- import tornado.ioloop import tornado.web import re class Field(object): def __init__(self, error_msg_dict, required): self.id_valid = False self.value = None self.error = None self.name = None self.error_msg = error_msg_dict self.required = required def match(self, name, value): self.name = name if not self.required: self.id_valid = True self.value = value else: if not value: if self.error_msg.get('required', None): self.error = self.error_msg['required'] else: self.error = "%s is required" % name else: ret = re.match(self.REGULAR, value) if ret: self.id_valid = True self.value = ret.group() else: if self.error_msg.get('valid', None): self.error = self.error_msg['valid'] else: self.error = "%s is invalid" % name class IPField(Field): REGULAR = "^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$" def __init__(self, error_msg_dict=None, required=True): error_msg = {} # {'required': 'IP不能爲空', 'valid': 'IP格式錯誤'} if error_msg_dict: error_msg.update(error_msg_dict) super(IPField, self).__init__(error_msg_dict=error_msg, required=required) class IntegerField(Field): REGULAR = "^\d+$" def __init__(self, error_msg_dict=None, required=True): error_msg = {'required': '數字不能爲空', 'valid': '數字格式錯誤'} if error_msg_dict: error_msg.update(error_msg_dict) super(IntegerField, self).__init__(error_msg_dict=error_msg, required=required) class CheckBoxField(Field): def __init__(self, error_msg_dict=None, required=True): error_msg = {} # {'required': 'IP不能爲空', 'valid': 'IP格式錯誤'} if error_msg_dict: error_msg.update(error_msg_dict) super(CheckBoxField, self).__init__(error_msg_dict=error_msg, required=required) def match(self, name, value): self.name = name if not self.required: self.id_valid = True self.value = value else: if not value: if self.error_msg.get('required', None): self.error = self.error_msg['required'] else: self.error = "%s is required" % name else: if isinstance(name, list): self.id_valid = True self.value = value else: if self.error_msg.get('valid', None): self.error = self.error_msg['valid'] else: self.error = "%s is invalid" % name class FileField(Field): REGULAR = "^(\w+\.pdf)|(\w+\.mp3)|(\w+\.py)$" def __init__(self, error_msg_dict=None, required=True): error_msg = {} # {'required': '數字不能爲空', 'valid': '數字格式錯誤'} if error_msg_dict: error_msg.update(error_msg_dict) super(FileField, self).__init__(error_msg_dict=error_msg, required=required) def match(self, name, value): self.name = name self.value = [] if not self.required: self.id_valid = True self.value = value else: if not value: if self.error_msg.get('required', None): self.error = self.error_msg['required'] else: self.error = "%s is required" % name else: m = re.compile(self.REGULAR) if isinstance(value, list): for file_name in value: r = m.match(file_name) if r: self.value.append(r.group()) self.id_valid = True else: self.id_valid = False if self.error_msg.get('valid', None): self.error = self.error_msg['valid'] else: self.error = "%s is invalid" % name break else: if self.error_msg.get('valid', None): self.error = self.error_msg['valid'] else: self.error = "%s is invalid" % name def save(self, request, upload_path=""): file_metas = request.files[self.name] for meta in file_metas: file_name = meta['filename'] with open(file_name,'wb') as up: up.write(meta['body']) class Form(object): def __init__(self): self.value_dict = {} self.error_dict = {} self.valid_status = True def validate(self, request, depth=10, pre_key=""): self.initialize() self.__valid(self, request, depth, pre_key) def initialize(self): pass def __valid(self, form_obj, request, depth, pre_key): """ 驗證用戶表單請求的數據 :param form_obj: Form對象（Form派生類的對象） :param request: Http請求上下文（用於從請求中獲取用戶提交的值） :param depth: 對Form內容的深度的支持 :param pre_key: Html中name屬性值的前綴（多層Form時，內部遞歸時設置，無需理會） :return: 是否驗證經過，True：驗證成功；False：驗證失敗 """ depth -= 1 if depth < 0: return None form_field_dict = form_obj.__dict__ for key, field_obj in form_field_dict.items(): print key,field_obj if isinstance(field_obj, Form) or isinstance(field_obj, Field): if isinstance(field_obj, Form): # 獲取以key開頭的全部的值，以參數的形式傳至 self.__valid(field_obj, request, depth, key) continue if pre_key: key = "%s.%s" % (pre_key, key) if isinstance(field_obj, CheckBoxField): post_value = request.get_arguments(key, None) elif isinstance(field_obj, FileField): post_value = [] file_list = request.request.files.get(key, None) for file_item in file_list: post_value.append(file_item['filename']) else: post_value = request.get_argument(key, None) print post_value # 讓提交的數據 和 定義的正則表達式進行匹配 field_obj.match(key, post_value) if field_obj.id_valid: self.value_dict[key] = field_obj.value else: self.error_dict[key] = field_obj.error self.valid_status = False class ListForm(object): def __init__(self, form_type): self.form_type = form_type self.valid_status = True self.value_dict = {} self.error_dict = {} def validate(self, request): name_list = request.request.arguments.keys() + request.request.files.keys() index = 0 flag = False while True: pre_key = "[%d]" % index for name in name_list: if name.startswith(pre_key): flag = True break if flag: form_obj = self.form_type() form_obj.validate(request, depth=10, pre_key="[%d]" % index) if form_obj.valid_status: self.value_dict[index] = form_obj.value_dict else: self.error_dict[index] = form_obj.error_dict self.valid_status = False else: break index += 1 flag = False class MainForm(Form): def __init__(self): # self.ip = IPField(required=True) # self.port = IntegerField(required=True) # self.new_ip = IPField(required=True) # self.second = SecondForm() self.fff = FileField(required=True) super(MainForm, self).__init__() # # class SecondForm(Form): # # def __init__(self): # self.ip = IPField(required=True) # self.new_ip = IPField(required=True) # # super(SecondForm, self).__init__() class MainHandler(tornado.web.RequestHandler): def get(self): self.render('index.html') def post(self, *args, **kwargs): # for i in dir(self.request): # print i # print self.request.arguments # print self.request.files # print self.request.query # name_list = self.request.arguments.keys() + self.request.files.keys() # print name_list # list_form = ListForm(MainForm) # list_form.validate(self) # # print list_form.valid_status # print list_form.value_dict # print list_form.error_dict # obj = MainForm() # obj.validate(self) # # print "驗證結果：", obj.valid_status # print "符合驗證結果：", obj.value_dict # print "錯誤信息:" # for key, item in obj.error_dict.items(): # print key,item # print self.get_arguments('favor'),type(self.get_arguments('favor')) # print self.get_argument('favor'),type(self.get_argument('favor')) # print type(self.get_argument('fff')),self.get_argument('fff') # print self.request.files # obj = MainForm() # obj.validate(self) # print obj.valid_status # print obj.value_dict # print obj.error_dict # print self.request,type(self.request) # obj.fff.save(self.request) # from tornado.httputil import HTTPServerRequest # name_list = self.request.arguments.keys() + self.request.files.keys() # print name_list # print self.request.files,type(self.request.files) # print len(self.request.files.get('fff')) # obj = MainForm() # obj.validate(self) # print obj.valid_status # print obj.value_dict # print obj.error_dict # obj.fff.save(self.request) self.write('ok') settings = { 'template_path': 'template', 'static_path': 'static', 'static_url_prefix': '/static/', 'cookie_secret': 'aiuasdhflashjdfoiuashdfiuh', 'login_url': '/login' } application = tornado.web.Application([ (r"/index", MainHandler), ], **settings) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start() Form驗證框架
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相關文章
- 1. tornado基本使用一
- 2. Tornado的使用
- 3. Tornado的基本知識
- 4. Tornado介紹和開始使用Tornado
- 5. tornado cookie的使用
- 6. tornado 使用入門
- 7. tornado-redis的使用
- 8. Tornado中sqlalchemy使用
- 9. 〖Python〗-- Tornado基礎
- 10. Tornado 框架的使用