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path: root/vnfs/DAaaS/lib/promql_api/prom_ql_api.py
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from __future__ import print_function
from os import environ
import logging
import requests
from requests.exceptions import HTTPError



API_VERSION = '/api/v1/query'
LIST_OF_ENV_VARIABLES = ["DATA_ENDPOINT"]
MAP_ENV_VARIABLES = dict()
LOG = logging.getLogger(__name__)

def set_log_config():
    logging.basicConfig(format='%(asctime)s ::%(filename)s :: %(funcName)s :: %(levelname)s :: %(message)s',
                    datefmt='%m-%d-%Y %I:%M:%S%p',
                    level=logging.DEBUG,
                    filename='promql_api.log',
                    filemode='w')
    LOG.info("Set the log configs.")


def load_and_validate_env_vars(list_of_env_vars):
    LOG.info("Loading the env variables ...")
    for env_var in list_of_env_vars:
        if env_var in environ:
            LOG.info("Found env variable: {} ".format(env_var.upper()))
            MAP_ENV_VARIABLES[env_var.upper()] = environ.get(env_var)
        else:
            #MAP_ENV_VARIABLES['DATA_ENDPOINT']='http://127.0.0.1:30090' # to be deleted
            LOG.error("Env var: {} not found ! ".format(env_var.upper()))
            raise KeyError("Env variable: {} not found ! ".format(env_var.upper()))


def query(LABELS):
    """
    Input parameters:
        LABELS : a list of the LABELS like ['irate(collectd_cpufreq{exported_instance="otconap7",cpufreq="1"}[2m])']
    Return:
        returns a list of  result sets of different labels.
        SAMPLE O/P:
        [{'metric': {'cpufreq': '1',
             'endpoint': 'collectd-prometheus',
             'exported_instance': 'otconap7',
             'instance': '172.25.103.1:9103',
             'job': 'collectd',
             'namespace': 'edge1',
             'pod': 'plundering-liger-collectd-wz7xg',
             'service': 'collectd'},
        'value': [1559177169.415, '119727200']}]
    """
    set_log_config()
    load_and_validate_env_vars(LIST_OF_ENV_VARIABLES)
    LOG.info("Forming the get request ...")
    list_of_substrings = []
    params_map = {}
    list_of_result_sets = []
    list_of_substrings.append(MAP_ENV_VARIABLES['DATA_ENDPOINT'])
    list_of_substrings.append(API_VERSION)
    url = ''.join(list_of_substrings)

    for each_label in LABELS:
        params_map['query'] = each_label
        try:
            LOG.info('API request::: URL: {} '.format(url))
            LOG.info('API request::: params: {} '.format(params_map))
            response = requests.get(url, params=params_map)
            response.raise_for_status()
        except HTTPError as http_err:
            print(f'HTTP error occurred: {http_err}')
            return None
        except Exception as err:
            print(f'Other error occurred: {err}')
            return None
        else:

            results = response.json()['data']['result']
            LOG.info('::::::::::RESULTS::::::::::::: {}'.format(each_label))
            for each_result in results:
                LOG.info(each_result)
            list_of_result_sets.append(results)
    return list_of_result_sets