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  • # Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
    #
    # 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.
    
    
    import operator
    from typing import Any, Callable, List, Tuple, Union
    
    ACTION_MSG_GET         = 'Get resource(key={:s})'
    ACTION_MSG_SET         = 'Set resource(key={:s}, value={:s})'
    ACTION_MSG_DELETE      = 'Delete resource(key={:s}, value={:s})'
    ACTION_MSG_SUBSCRIBE   = 'Subscribe subscription(key={:s}, duration={:s}, interval={:s})'
    ACTION_MSG_UNSUBSCRIBE = 'Unsubscribe subscription(key={:s}, duration={:s}, interval={:s})'
    
    def _get(resource_key : str):
        return ACTION_MSG_GET.format(str(resource_key))
    
    def _set(resource : Tuple[str, Any]):
        return ACTION_MSG_SET.format(*tuple(map(str, resource)))
    
    def _delete(resource : Tuple[str, Any]):
        return ACTION_MSG_SET.format(*tuple(map(str, resource)))
    
    def _subscribe(subscription : Tuple[str, float, float]):
        return ACTION_MSG_SUBSCRIBE.format(*tuple(map(str, subscription)))
    
    def _unsubscribe(subscription : Tuple[str, float, float]):
        return ACTION_MSG_UNSUBSCRIBE.format(*tuple(map(str, subscription)))
    
    def _check_errors(
        error_func : Callable, parameters_list : List[Any], results_list : List[Union[bool, Exception]]
        ) -> List[str]:
        errors = []
        for parameters, results in zip(parameters_list, results_list):
            if not isinstance(results, Exception): continue
            errors.append('Unable to {:s}; error({:s})'.format(error_func(parameters), str(results)))
        return errors
    
    def check_get_errors(
        resource_keys : List[str], results : List[Tuple[str, Union[Any, None, Exception]]]
        ) -> List[str]:
        return _check_errors(_get, resource_keys, map(operator.itemgetter(1), results))
    
    def check_set_errors(
        resources : List[Tuple[str, Any]], results : List[Union[bool, Exception]]
        ) -> List[str]:
        return _check_errors(_set, resources, results)
    
    def check_delete_errors(
        resources : List[Tuple[str, Any]], results : List[Union[bool, Exception]]
        ) -> List[str]:
        return _check_errors(_delete, resources, results)
    
    def check_subscribe_errors(
        subscriptions : List[Tuple[str, float, float]], results : List[Union[bool, Exception]]
        ) -> List[str]:
        return _check_errors(_subscribe, subscriptions, results)
    
    def check_unsubscribe_errors(
        subscriptions : List[Tuple[str, float, float]], results : List[Union[bool, Exception]]
        ) -> List[str]:
        return _check_errors(_unsubscribe, subscriptions, results)