Mercurial > repos > bcclaywell > argo_navis

comparison venv/lib/python2.7/site-packages/boto/plugin.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 # Copyright 2010 Google Inc.
2 #
3 # Permission is hereby granted, free of charge, to any person obtaining a
4 # copy of this software and associated documentation files (the
5 # "Software"), to deal in the Software without restriction, including
6 # without limitation the rights to use, copy, modify, merge, publish, dis-
7 # tribute, sublicense, and/or sell copies of the Software, and to permit
8 # persons to whom the Software is furnished to do so, subject to the fol-
9 # lowing conditions:
10 #
11 # The above copyright notice and this permission notice shall be included
12 # in all copies or substantial portions of the Software.
13 #
14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
20 # IN THE SOFTWARE.
21
22
23 """
24 Implements plugin related api.
25
26 To define a new plugin just subclass Plugin, like this.
27
28 class AuthPlugin(Plugin):
29 pass
30
31 Then start creating subclasses of your new plugin.
32
33 class MyFancyAuth(AuthPlugin):
34 capability = ['sign', 'vmac']
35
36 The actual interface is duck typed.
37 """
38
39 import glob
40 import imp
41 import os.path
42
43
44 class Plugin(object):
45 """Base class for all plugins."""
46
47 capability = []
48
49 @classmethod
50 def is_capable(cls, requested_capability):
51 """Returns true if the requested capability is supported by this plugin
52 """
53 for c in requested_capability:
54 if c not in cls.capability:
55 return False
56 return True
57
58
59 def get_plugin(cls, requested_capability=None):
60 if not requested_capability:
61 requested_capability = []
62 result = []
63 for handler in cls.__subclasses__():
64 if handler.is_capable(requested_capability):
65 result.append(handler)
66 return result
67
68
69 def _import_module(filename):
70 (path, name) = os.path.split(filename)
71 (name, ext) = os.path.splitext(name)
72
73 (file, filename, data) = imp.find_module(name, [path])
74 try:
75 return imp.load_module(name, file, filename, data)
76 finally:
77 if file:
78 file.close()
79
80 _plugin_loaded = False
81
82
83 def load_plugins(config):
84 global _plugin_loaded
85 if _plugin_loaded:
86 return
87 _plugin_loaded = True
88
89 if not config.has_option('Plugin', 'plugin_directory'):
90 return
91 directory = config.get('Plugin', 'plugin_directory')
92 for file in glob.glob(os.path.join(directory, '*.py')):
93 _import_module(file)