151 lines
5.8 KiB
Python
151 lines
5.8 KiB
Python
import sqlite3
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from exceptions import DisplayableException
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class Database:
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"""Implement interaction with the database."""
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def __init__(self, path: str) -> None:
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"""Create a database file if not exists."""
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# TODO: think about removing check_same_thread=False
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self.conn = sqlite3.connect(path, check_same_thread=False)
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self.cur = self.conn.cursor()
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self.__init_schema()
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def add_user(self, telegram_id: int) -> int:
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"""Add a user's telegram id to the database and return its database id."""
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self.cur.execute('INSERT INTO users (telegram_id) VALUES (?)', [telegram_id])
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self.conn.commit()
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return self.cur.lastrowid
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def find_user(self, telegram_id: int) -> int | None:
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"""Get a user's telegram id and return its database id."""
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self.cur.execute('SELECT id FROM users WHERE telegram_id = ?', [telegram_id])
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row = self.cur.fetchone()
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if row is None:
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return None
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return row[0]
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def add_feed(self, url: str) -> int:
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"""Add a feed to the database and return its id."""
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self.cur.execute('INSERT INTO feeds (url) VALUES (?)', [url])
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self.conn.commit()
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return self.cur.lastrowid
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def find_feed_by_url(self, url: str) -> int | None:
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"""Find feed ID by url."""
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self.cur.execute('SELECT id FROM feeds WHERE url = ?', [url])
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row = self.cur.fetchone()
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if row is None:
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return None
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return row[0]
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def subscribe_user_by_url(self, user_id: int, url: str) -> None:
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"""Subscribe user to the feed creating it if does not exist yet."""
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feed_id = self.find_feed_by_url(url)
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if feed_id is None:
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feed_id = self.add_feed(url)
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if self.is_user_subscribed(user_id, feed_id):
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raise DisplayableException('Already subscribed')
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self.subscribe_user(user_id, feed_id)
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def subscribe_user(self, user_id: int, feed_id: int) -> None:
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"""Subscribe a user to the feed."""
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self.cur.execute('INSERT INTO subscriptions (user_id, feed_id) VALUES (?, ?)', [user_id, feed_id])
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self.conn.commit()
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def unsubscribe_user_by_url(self, user_id: int, url: str) -> None:
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feed_id = self.find_feed_by_url(url)
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if feed_id is None:
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raise DisplayableException('Feed does not exist')
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if not self.is_user_subscribed(user_id, feed_id):
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raise DisplayableException('Not subscribed')
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self.unsubscribe_user(user_id, feed_id)
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if self.get_feed_subscribers_count(feed_id) == 0:
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# Feed is not used anymore. Removing.
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self.delete_feed(feed_id)
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def unsubscribe_user(self, user_id: int, feed_id: int) -> None:
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"""Unsubscribe a user from the feed."""
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self.cur.execute('DELETE FROM subscriptions WHERE feed_id = ? AND user_id = ?', [feed_id, user_id])
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self.conn.commit()
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def is_user_subscribed(self, user_id: int, feed_id: int) -> bool:
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"""Check if user subscribed to specific feed."""
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self.cur.execute('SELECT 1 FROM subscriptions WHERE user_id = ? AND feed_id = ?', [user_id, feed_id])
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row = self.cur.fetchone()
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if row is None:
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return False
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return True
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def delete_feed(self, feed_id: int) -> None:
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"""Delete a feed."""
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self.cur.execute('DELETE FROM feeds WHERE id = ?', [feed_id])
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self.conn.commit()
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def get_feed_subscribers_count(self, feed_id: int) -> int:
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"""Count feed subscribers."""
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self.cur.execute('SELECT COUNT(user_id) FROM subscriptions WHERE feed_id = ?', [feed_id])
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row = self.cur.fetchone()
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if row is None:
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return 0
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return int(row[0])
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def find_feeds(self) -> list:
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"""Get a list of feeds."""
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self.cur.execute('SELECT * FROM feeds')
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return self.cur.fetchall()
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def find_user_feeds(self, user_id: int) -> list:
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"""Return a list of feeds the user is subscribed to."""
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self.cur.execute('SELECT * FROM feeds WHERE id IN (SELECT feed_id FROM subscriptions WHERE user_id = ?)',
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[user_id])
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return self.cur.fetchall()
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def find_feed_items(self, feed_id: int) -> list:
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"""Get last feed items."""
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self.cur.execute('SELECT * FROM feeds_last_items WHERE feed_id = ?', [feed_id])
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return self.cur.fetchall()
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def update_feed_items(self, feed_id: int, new_items: list) -> None:
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"""Replace last feed items with a list items that receive."""
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for i in range(len(new_items)):
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new_items[i] = (feed_id,) + new_items[i]
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self.cur.execute('DELETE FROM feeds_last_items WHERE feed_id = ?', [feed_id])
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self.cur.executemany(
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'INSERT INTO feeds_last_items (feed_id, url, title, description, date) VALUES (?, ?, ?, ?, ?)', new_items)
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self.conn.commit()
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def __init_schema(self):
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# TODO: Move to migrations
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self.cur.execute(
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'CREATE TABLE IF NOT EXISTS users (id INTEGER, telegram_id INTEGER NOT NULL UNIQUE, PRIMARY KEY(id))'
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)
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self.cur.execute('CREATE TABLE IF NOT EXISTS feeds (id INTEGER, url TEXT NOT NULL UNIQUE, PRIMARY KEY(id))')
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self.cur.execute(
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'CREATE TABLE IF NOT EXISTS subscriptions ('
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' user_id INTEGER,'
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' feed_id INTEGER,'
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' UNIQUE (user_id, feed_id),'
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' FOREIGN KEY(user_id) REFERENCES users(id),'
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' FOREIGN KEY(feed_id) REFERENCES feeds(id)'
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')'
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)
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self.cur.execute(
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'CREATE TABLE IF NOT EXISTS feeds_last_items ('
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' feed_id INTEGER,'
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' url TEXT NOT NULL UNIQUE,'
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' title TEXT,'
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' description TEXT,'
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' date NUMERIC,'
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' FOREIGN KEY(feed_id) REFERENCES feeds(id)'
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')'
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)
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