vnfs/DAaaS/lib/promql_api/prom_ql_api.py

   1 from __future__ import print_function
   2 from os import environ
   3 import logging
   4 import requests
   5 from requests.exceptions import HTTPError
   6
   7
   8
   9 API_VERSION = '/api/v1/query'
  10 LIST_OF_ENV_VARIABLES = ["DATA_ENDPOINT"]
  11 MAP_ENV_VARIABLES = dict()
  12 LOG = logging.getLogger(__name__)
  13
  14 def set_log_config():
  15     logging.basicConfig(format='%(asctime)s ::%(filename)s :: %(funcName)s :: %(levelname)s :: %(message)s',
  16                     datefmt='%m-%d-%Y %I:%M:%S%p',
  17                     level=logging.DEBUG,
  18                     filename='promql_api.log',
  19                     filemode='w')
  20     LOG.info("Set the log configs.")
  21
  22
  23 def load_and_validate_env_vars(list_of_env_vars):
  24     LOG.info("Loading the env variables ...")
  25     for env_var in list_of_env_vars:
  26         if env_var in environ:
  27             LOG.info("Found env variable: {} ".format(env_var.upper()))
  28             MAP_ENV_VARIABLES[env_var.upper()] = environ.get(env_var)
  29         else:
  30             #MAP_ENV_VARIABLES['DATA_ENDPOINT']='http://127.0.0.1:30090' # to be deleted
  31             LOG.error("Env var: {} not found ! ".format(env_var.upper()))
  32             raise KeyError("Env variable: {} not found ! ".format(env_var.upper()))
  33
  34
  35 def query(LABELS):
  36     """
  37     Input parameters:
  38         LABELS : a list of the LABELS like ['irate(collectd_cpufreq{exported_instance="otconap7",cpufreq="1"}[2m])']
  39     Return:
  40         returns a list of  result sets of different labels.
  41         SAMPLE O/P:
  42         [{'metric': {'cpufreq': '1',
  43              'endpoint': 'collectd-prometheus',
  44              'exported_instance': 'otconap7',
  45              'instance': '172.25.103.1:9103',
  46              'job': 'collectd',
  47              'namespace': 'edge1',
  48              'pod': 'plundering-liger-collectd-wz7xg',
  49              'service': 'collectd'},
  50         'value': [1559177169.415, '119727200']}]
  51     """
  52     set_log_config()
  53     load_and_validate_env_vars(LIST_OF_ENV_VARIABLES)
  54     LOG.info("Forming the get request ...")
  55     list_of_substrings = []
  56     params_map = {}
  57     list_of_result_sets = []
  58     list_of_substrings.append(MAP_ENV_VARIABLES['DATA_ENDPOINT'])
  59     list_of_substrings.append(API_VERSION)
  60     url = ''.join(list_of_substrings)
  61
  62     for each_label in LABELS:
  63         params_map['query'] = each_label
  64         try:
  65             LOG.info('API request::: URL: {} '.format(url))
  66             LOG.info('API request::: params: {} '.format(params_map))
  67             response = requests.get(url, params=params_map)
  68             response.raise_for_status()
  69         except HTTPError as http_err:
  70             print(f'HTTP error occurred: {http_err}')
  71             return None
  72         except Exception as err:
  73             print(f'Other error occurred: {err}')
  74             return None
  75         else:
  76
  77             results = response.json()['data']['result']
  78             LOG.info('::::::::::RESULTS::::::::::::: {}'.format(each_label))
  79             for each_result in results:
  80                 LOG.info(each_result)
  81             list_of_result_sets.append(results)
  82     return list_of_result_sets