# Path: golem/core/parsing/date_utils.py
# def process_datetime(values, duration=None):
# def timedelta_from_grain(grain):
# def date_now(tzinfo):
# def date_today(tzinfo):
# def date_this_week(tzinfo):
# def date_this_month(tzinfo):
# def format_date_interval(from_date, to_date, grain):
# 
# Path: golem/core/parsing/entity_extractor.py
# class EntityExtractor(ABC):
#     """
#     Abstract class for entity extractors.
#     Responsible for processing text and extracting entities such as names, dates, places etc.
#     """
# 
#     def __init__(self):
#         pass
# 
#     @abstractmethod
#     def extract_entities(self, text: str, max_retries=5):
#         """
#         Extracts entities from text (a message from user).
#         :param text:        a string.
#         :param max_retries: how many times to retry on error.
#         :return: A dict of extracted entities.
#                  For example:
#                  {
#                     "place": [
#                         {"value": "Prague"},
#                         {"value": "New York", "metadata": {}}
#                     ],
#                     "name": [{"value": "Golem"}],
#                     ...
#                  }
#         """
#         return dict()
# 
# Path: golem/core/persistence.py
# def get_redis():
#     global _connection_pool
#     global _redis
#     if not _connection_pool:
#         config = settings.GOLEM_CONFIG.get('REDIS')
#         _connection_pool = redis.ConnectionPool(
#             host=config['HOST'],
#             port=config['PORT'],
#             password=config['PASSWORD'],
#             db=0,
#             max_connections=2
#         )
#     if not _redis:
#         _redis = redis.StrictRedis(connection_pool=_connection_pool)
#     return _redis


import json
import logging
import pickle
    import requests
from wit import Wit
from golem.core.parsing import date_utils
from golem.core.parsing.entity_extractor import EntityExtractor
from golem.core.persistence import get_redis
                # parse string metadata from Wit into a dict
                metadata = value.get('metadata')
                if metadata and isinstance(metadata, str):
                    try:
                        value['metadata'] = json.loads(metadata)
                    except:
                        self.log.warning("Ignoring invalid metadata for entity {}: {}".format(
                            entity, metadata
                        ))
                        value['metadata'] = None
        return entities

    def _load_from_cache(self, text):
        if self.cache:
            db = get_redis()
            if db.hexists('wit_cache', text):
                parsed = pickle.loads(db.hget('wit_cache', text))
                self.log.debug('Got cached wit key: "{}" = {}'.format(self.cache_key, parsed))
                return parsed
        return None

    def save_to_cache(self, text, entities):
        if self.cache and 'date_interval' not in entities:
            db = get_redis()
            self.log.debug('Caching wit key: {} = {}'.format(text, entities))
            db.hset('wit_cache', text, pickle.dumps(entities))

    def clear_wit_cache(self):
        if self.cache:
            self.log.debug('Clearing Wit cache...')

# Path: golem/core/parsing/date_utils.py
# def process_datetime(values, duration=None):
# def timedelta_from_grain(grain):
# def date_now(tzinfo):
# def date_today(tzinfo):
# def date_this_week(tzinfo):
# def date_this_month(tzinfo):
# def format_date_interval(from_date, to_date, grain):
# 
# Path: golem/core/parsing/entity_extractor.py
# class EntityExtractor(ABC):
#     """
#     Abstract class for entity extractors.
#     Responsible for processing text and extracting entities such as names, dates, places etc.
#     """
# 
#     def __init__(self):
#         pass
# 
#     @abstractmethod
#     def extract_entities(self, text: str, max_retries=5):
#         """
#         Extracts entities from text (a message from user).
#         :param text:        a string.
#         :param max_retries: how many times to retry on error.
#         :return: A dict of extracted entities.
#                  For example:
#                  {
#                     "place": [
#                         {"value": "Prague"},
#                         {"value": "New York", "metadata": {}}
#                     ],
#                     "name": [{"value": "Golem"}],
#                     ...
#                  }
#         """
#         return dict()
# 
# Path: golem/core/persistence.py
# def get_redis():
#     global _connection_pool
#     global _redis
#     if not _connection_pool:
#         config = settings.GOLEM_CONFIG.get('REDIS')
#         _connection_pool = redis.ConnectionPool(
#             host=config['HOST'],
#             port=config['PORT'],
#             password=config['PASSWORD'],
#             db=0,
#             max_connections=2
#         )
#     if not _redis:
#         _redis = redis.StrictRedis(connection_pool=_connection_pool)
#     return _redis


# Path: golem/core/parsing/wit_extractor.py
import json
import logging
import pickle
    import requests
from wit import Wit
from golem.core.parsing import date_utils
from golem.core.parsing.entity_extractor import EntityExtractor
from golem.core.persistence import get_redis

                # parse string metadata from Wit into a dict
                metadata = value.get('metadata')
                if metadata and isinstance(metadata, str):
                    try:
                        value['metadata'] = json.loads(metadata)
                    except:
                        self.log.warning("Ignoring invalid metadata for entity {}: {}".format(
                            entity, metadata
                        ))
                        value['metadata'] = None
        return entities

    def _load_from_cache(self, text):
        if self.cache:
            db = get_redis()
            if db.hexists('wit_cache', text):
                parsed = pickle.loads(db.hget('wit_cache', text))
                self.log.debug('Got cached wit key: "{}" = {}'.format(self.cache_key, parsed))
                return parsed
        return None

    def save_to_cache(self, text, entities):
        if self.cache and 'date_interval' not in entities:
            db = get_redis()
            self.log.debug('Caching wit key: {} = {}'.format(text, entities))
            db.hset('wit_cache', text, pickle.dumps(entities))

    def clear_wit_cache(self):
        if self.cache:
            self.log.debug('Clearing Wit cache...')

            db = get_redis()