94024d7b7bdba906c18bc372735704a51f379441
1 # -*- coding: utf-8 -*-
3 # Copyright 2018 Whitestack, LLC
4 # *************************************************************
6 # This file is part of OSM Monitoring module
7 # All Rights Reserved to Whitestack, LLC
9 # Licensed under the Apache License, Version 2.0 (the "License"); you may
10 # not use this file except in compliance with the License. You may obtain
11 # a copy of the License at
13 # http://www.apache.org/licenses/LICENSE-2.0
15 # Unless required by applicable law or agreed to in writing, software
16 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
17 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
18 # License for the specific language governing permissions and limitations
20 # For those usages not covered by the Apache License, Version 2.0 please
21 # contact: bdiaz@whitestack.com or glavado@whitestack.com
27 from osm_mon
.core
.config
import Config
28 from osm_mon
.evaluator
.backends
.base
import BaseBackend
30 log
= logging
.getLogger(__name__
)
32 OSM_METRIC_PREFIX
= "osm_"
35 class PrometheusBackend(BaseBackend
):
36 def __init__(self
, config
: Config
):
37 super().__init
__(config
)
40 def get_metric_value(self
, metric_name
: str, tags
: dict):
41 query
= self
._build
_query
(metric_name
, tags
)
42 request_url
= self
._build
_url
(query
)
43 log
.info("Querying Prometheus: %s", request_url
)
45 request_url
, timeout
=int(self
.conf
.get("global", "request_timeout"))
47 if r
.status_code
== 200:
48 json_response
= r
.json()
49 if json_response
["status"] == "success":
50 return self
._get
_metric
_value
_from
_response
(json_response
)
53 "Prometheus response is not success. Got status %s",
54 json_response
["status"],
58 "Error contacting Prometheus. Got status code %s: %s",
64 def _build_query(self
, metric_name
: str, tags
: dict) -> str:
65 query_section_tags
= []
66 for k
, v
in tags
.items():
67 query_section_tags
.append(k
+ '="' + v
+ '"')
68 query_section
= "query={0}{{{1}}}".format(
69 OSM_METRIC_PREFIX
+ metric_name
, ",".join(query_section_tags
)
73 def _build_url(self
, query
: str):
74 return self
.conf
.get("prometheus", "url") + "/api/v1/query?" + query
76 def _get_metric_value_from_response(self
, json_response
):
77 result
= json_response
["data"]["result"]
79 metric_value
= float(result
[0]["value"][1])
80 log
.info("Metric value: %s", metric_value
)