1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
'''This module implements a templating generator based on Genshi'''
__revision__ = '$Revision$'
from genshi.template import TemplateLoader, TextTemplate, MarkupTemplate, TemplateError
import logging, lxml.etree, posixpath, re, os
import Bcfg2.Server.Plugin
logger = logging.getLogger('Bcfg2.Plugins.TGenshi')
info = re.compile('^owner:(\s)*(?P<owner>\w+)$|group:(\s)*(?P<group>\w+)$|' +
'perms:(\s)*(?P<perms>\w+)$')
class TemplateFile:
'''Template file creates Genshi template structures for the loaded file'''
def __init__(self, name, loader, properties):
self.name = name
self.states = {'template': False, 'info': False}
self.metadata = {'owner': 'root', 'group': 'root', 'perms': '0644'}
self.properties = properties
self.loader = loader
def HandleEvent(self, event):
'''Handle all fs events for this template'''
if event.filename in ['template.xml', 'template.txt']:
try:
if event.filename.endswith('.txt'):
self.template = self.loader.load(os.path.join(self.name[1:], event.filename), cls=TextTemplate)
else:
self.template = self.loader.load(os.path.join(self.name[1:], event.filename), cls=MarkupTemplate)
except TemplateError, terror:
logger.error('Genshi template error: %s' % terror)
elif event.filename == 'info':
for line in open(self.name + '/info').readlines():
match = info.match(line)
if not match:
logger.warning("Failed to match line: %s"%line)
continue
else:
mgd = match.groupdict()
if mgd['owner']:
self.metadata['owner'] = mgd['owner']
elif mgd['group']:
self.metadata['group'] = mgd['group']
elif mgd['perms']:
self.metadata['perms'] = mgd['perms']
if len(self.metadata['perms']) == 3:
self.metadata['perms'] = "0%s" % (self.metadata['perms'])
else:
logger.info('Ignoring event for %s' % event.filename)
def BuildFile(self, entry, metadata):
'''Build literal file information'''
try:
stream = self.template.generate(name=entry.get('name'), metadata=metadata, properties=self.properties)
if isinstance(self.template, TextTemplate):
entry.text = stream.render('text')
else:
entry.text = stream.render('xml')
except TemplateError, terror:
logger.error('Genshi template error: %s' % terror)
raise Bcfg2.Server.Plugin.PluginExecutionError
[entry.attrib.__setitem__(key, value) for (key, value) in self.metadata.iteritems()]
class GenshiProperties(Bcfg2.Server.Plugin.SingleXMLFileBacked):
'''Class for Genshi properties'''
def Index(self):
'''Build data into an elementtree object for templating usage'''
try:
self.properties = lxml.etree.XML(self.data)
del self.data
except lxml.etree.XMLSyntaxError:
logger.error("Failed to parse properties")
class FakeProperties:
'''Dummy class used when properties dont exist'''
def __init__(self):
self.properties = lxml.etree.Element("Properties")
class TGenshi(Bcfg2.Server.Plugin.Plugin):
'''The TGenshi generator implements a templating mechanism for configuration files'''
__name__ = 'TGenshi'
__version__ = '$Id$'
__author__ = 'jeff@ocjtech.us'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
if self.data[-1] == '/':
self.data = self.data[:-1]
self.Entries['ConfigFile'] = {}
self.entries = {}
self.handles = {}
self.loader = TemplateLoader(self.data, auto_reload=True)
self.AddDirectoryMonitor('')
try:
self.properties = GenshiProperties('%s/../etc/properties.xml' \
% (self.data), self.core.fam)
except:
self.properties = FakeProperties()
self.logger.info("Failed to read properties file; TGenshi properties disabled")
def BuildEntry(self, entry, metadata):
'''Dispatch fetch calls to the correct object'''
self.entries[entry.get('name')].BuildFile(entry, metadata)
def HandleEvent(self, event):
'''Unified FAM event handler for DirShadow'''
action = event.code2str()
if event.filename[0] == '/':
return
epath = "".join([self.data, self.handles[event.requestID], event.filename])
if event.filename in ['info', 'template.xml', 'template.txt']:
identifier = self.handles[event.requestID][:-1]
else:
identifier = self.handles[event.requestID] + event.filename
if action in ['exists', 'created']:
if posixpath.isdir(epath):
self.AddDirectoryMonitor(epath[len(self.data):])
elif event.filename in ['info', 'template.xml', 'template.txt']:
if not self.entries.has_key(identifier):
self.entries[identifier] = TemplateFile(identifier, self.loader, self.properties)
self.Entries['ConfigFile'][identifier] = self.BuildEntry
self.entries[identifier].HandleEvent(event)
else:
logger.info('Not creating template for %s' % identifier)
elif action == 'changed':
if self.entries.has_key(identifier):
self.entries[identifier].HandleEvent(event)
elif action == 'deleted':
if event.filename in ['template.xml', 'template.txt'] and self.entries.has_key(identifier):
del self.entries[identifier]
del self.Entries['ConfigFile'][identifier]
def AddDirectoryMonitor(self, relative):
'''Add new directory to FAM structures'''
if not relative:
relative = '/'
if relative[-1] != '/':
relative += '/'
name = self.data + relative
if relative not in self.handles.values():
if not posixpath.isdir(name):
print "Genshi: Failed to open directory %s" % (name)
return
reqid = self.core.fam.AddMonitor(name, self)
self.handles[reqid] = relative
|
