1
2 """
3 Tutorial 06 - Aspects
4
5 CherryPy2 的 投影机制 可以让你动态的在响应请求之前和之后 增加一些代码.
6 这对于 多个函式或是类需要共同的行为情景非常有用！
7 (aspects can be part of derived classes).
8 """
9
10 from cherrypy import cpg
11
12
13 from cherrypy.lib.aspect import Aspect, STOP, CONTINUE
14
15 class Page(Aspect):
16 """要求从 Aspect 继承类
17 """
18 title = 'Untitled Page'
19
20 def header(self):
21 """与05_derived_objects.py相同的代码
22 """
23 return '''
24 <html>
25 <head>
26 <title>%s</title>
27 <head>
28 <body>
29 <h2>%s</h2>
30 ''' % (self.title, self.title)
31
32 def footer(self):
33 return '''
34 </body>
35 </html>
36 '''
37
38 def _before(self, methodName, method):
39 """投影函式 _before 会在任何函式运行时被调用，如果你有一些函式不想如此处理
40 可以在调用前检测一下
41 """
42 if methodName not in ['header', 'footer']:
43 return CONTINUE, self.header()
44 else:
45 return CONTINUE, ''
46
47 def _after(self, methodName, method):
48 """同上投影函式 _after 是在任何函式运行后自动调用
49 """
50 if methodName not in ['header', 'footer']:
51 return CONTINUE, self.footer()
52 else:
53 return CONTINUE, ''
54
55 class HomePage(Page):
56 title = 'Tutorial 6 -- Aspect Powered!'
57
58 def __init__(self):
59 """初始化下层页面引用
60 """
61 self.another = AnotherPage()
62
63 def index(self):
64 """注意！这里我们不用调用 header 和 footer
65 - 从Page 继承爱厂如家类都会被 投影机制 自动处理
66 """
67 return '''
68 <p>
69 Isn't this exciting? There's
70 <a href="./another/">another page</a>, too!
71 </p>
72 '''
73
74 index.exposed = True
75
76
77 class AnotherPage(Page):
78 title = 'Another Page'
79
80 def __init__(self):
81 self.deep = DeepPage()
82
83 def index(self):
84
85 return '''
86 <p>
87 And this is the amazing second page!
88 </p>
89 <!--我添加的再下层链接-->
90 <a href="deep">deep goon!</a>
91 '''
92 index.exposed = True
93
94 class DeepPage(Page):
95 title = 'Deep Page'
96
97 def index(self):
98
99 return '''
100 <p>
101 And this is the amazing 3td page!
102 </p>
103 '''
104 index.exposed = True
105
106 cpg.root = HomePage()
107
108 cpg.server.start(configFile = 'tutorial.conf')
