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
|
# Copyright 2016 Rackspace Hosting
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from oslo_config import cfg
from ironic_python_agent import errors
from ironic_python_agent.metrics_lib import metrics
from ironic_python_agent.metrics_lib import metrics_collector
from ironic_python_agent.metrics_lib import metrics_statsd
metrics_opts = [
cfg.StrOpt('backend',
default='noop',
choices=[
('noop', 'Do nothing in relation to metrics.'),
('statsd', 'Transmits metrics data to a statsd backend.'),
('collector', 'Collects metrics data and saves it in '
'memory for use by the running application.'),
],
help='Backend to use for the metrics system.'),
cfg.BoolOpt('prepend_host',
default=False,
help='Prepend the hostname to all metric names. '
'The format of metric names is '
'[global_prefix.][host_name.]prefix.metric_name.'),
cfg.BoolOpt('prepend_host_reverse',
default=True,
help='Split the prepended host value by "." and reverse it '
'(to better match the reverse hierarchical form of '
'domain names).'),
cfg.StrOpt('global_prefix',
help='Prefix all metric names with this value. '
'By default, there is no global prefix. '
'The format of metric names is '
'[global_prefix.][host_name.]prefix.metric_name.')
]
CONF = cfg.CONF
def get_metrics_logger(prefix='', backend=None, host=None, delimiter='.'):
"""Return a metric logger with the specified prefix.
The format of the prefix is:
[global_prefix<delim>][host_name<delim>]prefix
where <delim> is the delimiter (default is '.')
:param prefix: Prefix for this metric logger.
Value should be a string or None.
:param backend: Backend to use for the metrics system.
Possible values are 'noop' and 'statsd'.
:param host: Name of this node.
:param delimiter: Delimiter to use for the metrics name.
:return: The new MetricLogger.
"""
if not isinstance(prefix, str):
msg = ("This metric prefix (%s) is of unsupported type. "
"Value should be a string or None"
% str(prefix))
raise errors.InvalidMetricConfig(msg)
if CONF.metrics.prepend_host and host:
if CONF.metrics.prepend_host_reverse:
host = '.'.join(reversed(host.split('.')))
if prefix:
prefix = delimiter.join([host, prefix])
else:
prefix = host
if CONF.metrics.global_prefix:
if prefix:
prefix = delimiter.join([CONF.metrics.global_prefix, prefix])
else:
prefix = CONF.metrics.global_prefix
backend = backend or CONF.metrics.backend
if backend == 'statsd':
return metrics_statsd.StatsdMetricLogger(prefix, delimiter=delimiter)
elif backend == 'noop':
return metrics.NoopMetricLogger(prefix, delimiter=delimiter)
elif backend == 'collector':
return metrics_collector.DictCollectionMetricLogger(
prefix, delimiter=delimiter)
else:
msg = ("The backend is set to an unsupported type: "
"%s. Value should be 'noop' or 'statsd'."
% backend)
raise errors.InvalidMetricConfig(msg)
|
