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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
# Copyright 2015 Canonical Ltd.
# This file is part of cloud-init. See LICENCE file for license information.
#
# vi: ts=4 expandtab
"""
cloud-init reporting framework
The reporting framework is intended to allow all parts of cloud-init to
report events in a structured manner.
"""
from cloudinit.registry import DictRegistry
from cloudinit.reporting.handlers import available_handlers
FINISH_EVENT_TYPE = 'finish'
START_EVENT_TYPE = 'start'
DEFAULT_CONFIG = {
'logging': {'type': 'log'},
}
instantiated_handler_registry = DictRegistry()
class _nameset(set):
def __getattr__(self, name):
if name in self:
return name
raise AttributeError("%s not a valid value" % name)
status = _nameset(("SUCCESS", "WARN", "FAIL"))
class ReportingEvent(object):
"""Encapsulation of event formatting."""
def __init__(self, event_type, name, description):
self.event_type = event_type
self.name = name
self.description = description
def as_string(self):
"""The event represented as a string."""
return '{0}: {1}: {2}'.format(
self.event_type, self.name, self.description)
class FinishReportingEvent(ReportingEvent):
def __init__(self, name, description, result=status.SUCCESS):
super(FinishReportingEvent, self).__init__(
FINISH_EVENT_TYPE, name, description)
self.result = result
if result not in status:
raise ValueError("Invalid result: %s" % result)
def as_string(self):
return '{0}: {1}: {2}: {3}'.format(
self.event_type, self.name, self.result, self.description)
def add_configuration(config):
for handler_name, handler_config in config.items():
handler_config = handler_config.copy()
cls = available_handlers.registered_items[handler_config.pop('type')]
instance = cls(**handler_config)
instantiated_handler_registry.register_item(handler_name, instance)
def report_event(event):
"""Report an event to all registered event handlers.
This should generally be called via one of the other functions in
the reporting module.
:param event_type:
The type of the event; this should be a constant from the
reporting module.
"""
for _, handler in instantiated_handler_registry.registered_items.items():
handler.publish_event(event)
def report_finish_event(event_name, event_description,
result=status.SUCCESS):
"""Report a "finish" event.
See :py:func:`.report_event` for parameter details.
"""
event = FinishReportingEvent(event_name, event_description, result)
return report_event(event)
def report_start_event(event_name, event_description):
"""Report a "start" event.
:param event_name:
The name of the event; this should be a topic which events would
share (e.g. it will be the same for start and finish events).
:param event_description:
A human-readable description of the event that has occurred.
"""
event = ReportingEvent(START_EVENT_TYPE, event_name, event_description)
return report_event(event)
class ReportEventStack(object):
def __init__(self, name, description, message=None, parent=None,
reporting_enabled=None, result_on_exception=status.FAIL):
self.parent = parent
self.name = name
self.description = description
self.message = message
self.result_on_exception = result_on_exception
self.result = status.SUCCESS
# use parents reporting value if not provided
if reporting_enabled is None:
if parent:
reporting_enabled = parent.reporting_enabled
else:
reporting_enabled = True
self.reporting_enabled = reporting_enabled
if parent:
self.fullname = '/'.join((parent.fullname, name,))
else:
self.fullname = self.name
self.children = {}
def __repr__(self):
return ("%s reporting=%s" % (self.fullname, self.reporting_enabled))
def __enter__(self):
self.result = status.SUCCESS
if self.reporting_enabled:
report_start_event(self.fullname, self.description)
if self.parent:
self.parent.children[self.name] = (None, None)
return self
def childrens_finish_info(self):
for cand_result in (status.FAIL, status.WARN):
for name, (value, msg) in self.children.items():
if value == cand_result:
return (value, "[" + name + "]" + msg)
return (self.result, self.message)
@property
def message(self):
if self._message is not None:
return self._message
return self.description
@message.setter
def message(self, value):
self._message = value
def finish_info(self, exc):
# return tuple of description, and value
if exc:
return (self.result_on_exception, self.message)
return self.childrens_finish_info()
def __exit__(self, exc_type, exc_value, traceback):
(result, msg) = self.finish_info(exc_value)
if self.parent:
self.parent.children[self.name] = (result, msg)
if self.reporting_enabled:
report_finish_event(self.fullname, msg, result)
add_configuration(DEFAULT_CONFIG)
|
