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import pymongo |
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import os |
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import pandas as pd |
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from config import DATABASE, COLLECTION |
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from logger import get_logger |
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logger = get_logger() |
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class DBRead: |
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""" |
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Reads news from MongoDB |
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""" |
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def __init__(self): |
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self.url = os.getenv('DB_URL') |
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self.database = DATABASE |
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self.collection = COLLECTION |
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self.__client = None |
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self.__error = 0 |
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def __connect(self): |
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try: |
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self.__client = pymongo.MongoClient(self.url) |
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_ = self.__client.list_database_names() |
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except Exception as conn_exception: |
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self.__error = 1 |
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self.__client = None |
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raise |
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def __read(self): |
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try: |
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db = self.__client[self.database] |
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coll = db[self.collection] |
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docs = [] |
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for doc in coll.find(): |
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docs.append(doc) |
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rss_df = pd.DataFrame(docs) |
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except Exception as insert_err: |
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self.__error = 1 |
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rss_df = pd.DataFrame({'_id': '', 'title': '', 'url': '', |
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'description': '', 'parsed_date': '', |
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'src': ''}, index=[0]) |
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return rss_df |
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def __close_connection(self): |
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if self.__client is not None: |
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self.__client.close() |
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self.__client = None |
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def read_news_from_db(self): |
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logger.warning('Entering read_news_from_db() to read old news') |
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rss_df = pd.DataFrame({'_id': '', 'title': '', 'url': '', |
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'description': '', 'parsed_date': '', |
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'src': ''}, index=[0]) |
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if self.url is not None: |
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if self.__error == 0: |
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self.__connect() |
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if self.__error == 0: |
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rss_df = self.__read() |
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if self.__error == 0: |
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print("Read Successful") |
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if self.__client is not None: |
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self.__close_connection() |
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logger.warning('Entering read_news_from_db()') |
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return rss_df |