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#!/usr/bin/env python3


# Copyright 2020 University Of Delhi.
#
# 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.



"""(Post)Deployment State Validation tool
"""

import argparse
import logging
import os
import re
import ast
import sys
from datetime import datetime
import requests

from tools.conf import settings
from tools.result_api import result_api, Local
from internal import load_pdf
from internal import display_report
from internal.validator import AirshipValidator


VERBOSITY_LEVELS = {
    'debug': logging.DEBUG,
    'info': logging.INFO,
    'warning': logging.WARNING,
    'error': logging.ERROR,
    'critical': logging.CRITICAL
}

_LOGGER = logging.getLogger()
_CURR_DIR = os.path.dirname(os.path.realpath(__file__))



def parse_param_string(values):
    """
    Parse and split a single '--test-params' argument.

    This expects either 'x=y', 'x=y,z' or 'x' (implicit true)
    values. For multiple overrides use a ; separated list for
    e.g. --test-params 'x=z; y=(a,b)'
    """
    results = {}

    if values == '':
        return {}

    for param, _, value in re.findall('([^;=]+)(=([^;]+))?', values):
        param = param.strip()
        value = value.strip()
        if param:
            if value:
                # values are passed inside string from CLI, so we must retype them accordingly
                try:
                    results[param] = ast.literal_eval(value)
                except ValueError:
                    # for backward compatibility, we have to accept strings without quotes
                    _LOGGER.warning(f'Adding missing quotes around string value: {param} = {str(value)}')
                    results[param] = str(value)
            else:
                results[param] = True
    return results

def parse_arguments():
    """
    Parse command line arguments.
    """

    class _SplitTestParamsAction(argparse.Action):
        """
        Parse and split '--conf-params' arguments.

        This expects either a single list of ; separated overrides
        as 'x=y', 'x=y,z' or 'x' (implicit true) values.
        e.g. --test-params 'x=z; y=(a,b)'
        Or a list of these ; separated lists with overrides for
        multiple tests.
        e.g. --test-params "['x=z; y=(a,b)','x=z']"
        """
        def __call__(self, parser, namespace, values, option_string=None):
            if values[0] == '[':
                input_list = ast.literal_eval(values)
                parameter_list = []
                for test_params in input_list:
                    parameter_list.append(parse_param_string(test_params))
            else:
                parameter_list = parse_param_string(values)
            results = parameter_list
            setattr(namespace, self.dest, results)


    class _ValidateFileAction(argparse.Action):
        """Validate a file can be read from before using it.
        """
        def __call__(self, parser, namespace, values, option_string=None):
            if not os.path.isfile(values):
                raise argparse.ArgumentTypeError(
                    'the path \'%s\' is not a valid path' % values)
            if not os.access(values, os.R_OK):
                raise argparse.ArgumentTypeError(
                    'the path \'%s\' is not accessible' % values)

            setattr(namespace, self.dest, values)

    def list_logging_levels():
        """Give a summary of all available logging levels.

        :return: List of verbosity level names in decreasing order of
            verbosity
        """
        return sorted(VERBOSITY_LEVELS.keys(),
                      key=lambda x: VERBOSITY_LEVELS[x])

    parser = argparse.ArgumentParser(description='(Post)Deployment State Validation tool')

    parser.add_argument('--version', action='version', version='%(prog)s 0.1')

    parser.add_argument('--log-verbosity', choices=list_logging_levels(),
                        help='logging level')
    parser.add_argument('-s', '--save-results-locally', action="store_true",
                        default=None, help='turn on local storage of results')

    group = parser.add_argument_group('test configuration options')
    group.add_argument('--conf-file', action=_ValidateFileAction,
                       help='settings file')
    group.add_argument('--conf-params', action=_SplitTestParamsAction,
                       help='csv list of conf-file parameters: key=val; e.g. '
                       'KUBE_CONFIG=/path/to/kubeconfig/file;PDF_FILE=path/to/pdf/file'
                       ' or a list of csv lists of conf-file parameters: key=val; e.g. '
                       '[\'KUBE_CONFIG=/path/to/kubeconfig/file\','
                       '\'PDF_FILE=path/to/pdf/file\']')
    group.add_argument('--test-suite', help='set of checks to perform. values: default, k8s')

    group = parser.add_argument_group('override conf-file options')
    group.add_argument('--pdf-file', help='Path to PDF file')



    args = vars(parser.parse_args())

    return args


def main():
    """Main Function
    """
    args = parse_arguments()

    ##################################
    # Load settings:
    #    precedence: cli > env > conf-file > settings-dir
    ##################################

    settings.load_from_dir(os.path.join(_CURR_DIR, 'settings'))

    if args["conf_file"]:
        settings.load_from_file(os.path.join(_CURR_DIR, args["conf_file"]))

    settings.load_from_env()

    if args['conf_params']:
        args = {**args.pop('conf_params'), **args} #merge 2 dicts
    for key in args:
        settings.setValue(key, args[key])


    ##################################
    # Results settings:
    ##################################
    now = datetime.now().strftime("%d-%m-%Y_%H-%M-%S/")
    results_path = settings.getValue('results_dir') + now
    settings.setValue('results_path', results_path)
    if not os.path.exists(results_path):
        os.makedirs(results_path)


    ##################################
    # Logs settings:
    ##################################

    log_file = results_path + settings.getValue('log_filename')
    stream_handler = logging.StreamHandler(sys.stdout)
    file_handler = logging.FileHandler(filename=log_file)

    level = settings.getValue('LOG_VERBOSITY')
    _LOGGER.setLevel(logging.DEBUG)
    stream_handler.setLevel(VERBOSITY_LEVELS[level])
    file_handler.setLevel(VERBOSITY_LEVELS[level])

    form = '[%(levelname)-8s] : %(msg)s'
    if level == 'debug':
        form = '["%(asctime)s"][%(levelname)-8s][%(pathname)s:%(funcName)s:%(lineno)-4s] : %(msg)s'
    stream_handler.setFormatter(logging.Formatter(form))
    file_handler.setFormatter(logging.Formatter(form))

    _LOGGER.addHandler(stream_handler)
    _LOGGER.addHandler(file_handler)


    ##################################
    # ResultAPI settings:
    ##################################

    if settings.getValue('save_results_locally'):
        result_api.register_storage(Local())


    ####
    # Still Developing
    ####
    load_pdf()

    installer = settings.getValue('pdf_file')["deployment_info"]["installer_used"].lower()

    if installer == 'airship':
        airship = AirshipValidator()
        airship.validate()
        report = airship.get_report()


    # Displaying Report
    display_report(report)

    if settings.getValue('enable_testapi'):
        logger = logging.getLogger(__name__)
        logger.info('Publishing results to TestAPI')
        url = settings.getValue('testapi_url')
        url += "/results/"
        response = requests.post(url, json=report)
        logger.info(response)




if __name__ == "__main__":
    main()