| import pymongo | |
| import os | |
| import pandas as pd | |
| from config import PRODUCTION_URL, PRODUCTION_DATABASE, PRODUCTION_COLLECTION | |
| from logger import get_logger | |
| logger = get_logger() | |
| class DBRead: | |
| """ | |
| Reads news from MongoDB | |
| """ | |
| def __init__(self): | |
| self.url = PRODUCTION_URL | |
| self.database = PRODUCTION_DATABASE | |
| self.collection = PRODUCTION_COLLECTION | |
| self.__client = None | |
| self.__error = 0 | |
| def __connect(self): | |
| try: | |
| self.__client = pymongo.MongoClient(self.url) | |
| _ = self.__client.list_database_names() | |
| except Exception as conn_exception: | |
| self.__error = 1 | |
| self.__client = None | |
| def __read(self): | |
| try: | |
| db = self.__client[self.database] | |
| coll = db[self.collection] | |
| docs = [] | |
| for doc in coll.find(): | |
| docs.append(doc) | |
| rss_df = pd.DataFrame(docs) | |
| except Exception as insert_err: | |
| self.__error = 1 | |
| rss_df = pd.DataFrame() | |
| return rss_df | |
| def __close_connection(self): | |
| if self.__client is not None: | |
| self.__client.close() | |
| self.__client = None | |
| def read_news_from_db(self): | |
| logger.warning('Entering read_news_from_db() to read old news') | |
| rss_df = pd.DataFrame() | |
| if self.url is not None: | |
| if self.__error == 0: | |
| self.__connect() | |
| if self.__error == 0: | |
| rss_df = self.__read() | |
| if self.__error == 0: | |
| logger.warning(f"Read Successful. Read {len(rss_df)} documents.") | |
| if self.__client is not None: | |
| self.__close_connection() | |
| logger.warning(f'Exiting read_news_from_db()') | |
| if len(rss_df) == 0: | |
| rss_df = None | |
| return rss_df |