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84 lines
3.1 KiB
Python
84 lines
3.1 KiB
Python
import logging
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import sqlite3
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import threading
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from typing import List
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import constants
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logger = logging.getLogger('database')
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logger.setLevel(logging.DEBUG)
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lock = threading.Lock()
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class Database(object):
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def __init__(self):
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logger.debug(f"Connected to '{constants.DATABASE}'")
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self.conn = sqlite3.connect(constants.DATABASE)
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self.__isClosed = False
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@property
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def is_closed(self) -> bool:
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return self.__isClosed
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def close(self) -> None:
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"""
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Closes the database connection and record it's connection status.
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"""
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if self.__isClosed:
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logger.warning(f'Database connection is already closed.', exc_info=True)
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else:
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self.conn.close()
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self.__isClosed = True
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def construct(self):
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with lock:
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cur = self.conn.cursor()
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try:
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# check if the table exists
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cur.execute('''SELECT name FROM sqlite_master WHERE type='table' AND name='?';''', 'message')
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# if it doesn't exist, create the table and report it
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if cur.fetchone() is None:
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self.conn.execute('''CREATE TABLE message
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(id INTEGER PRIMARY KEY,
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nickname TEXT NOT NULL,
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connection_hash TEXT NOT NULL,
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color TEXT DEFAULT '#000000',
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message TEXT DEFAULT '',
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timestamp INTEGER NOT NULL)''')
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logger.debug("'message' table created.")
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finally:
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cur.close()
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def add_message(self, nickname: str, user_hash: str, color: str, message: str, timestamp: int) -> int:
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"""
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Insert a message into the database. Returns the message ID.
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:param nickname: A non-unique identifier for the user.
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:param user_hash: A unique hash (usually) denoting the sender's identity.
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:param color: The color of the user who sent the message.
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:param message: The string content of the message echoed to all clients.
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:param timestamp: The epoch time of the sent message.
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:return: The unique integer primary key chosen for the message, i.e. it's ID.
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"""
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with lock:
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with self.conn:
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cur = self.conn.cursor()
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try:
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cur.execute('''INSERT INTO message (nickname, connection_hash, color, message, timestamp)
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VALUES (?, ?, ?, ?, ?)''', [nickname, user_hash, color, message, timestamp])
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logger.debug(f'Message {cur.lastrowid} recorded.')
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return cur.lastrowid
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finally:
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cur.close()
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def get_messages(self, columns: List[str] = None):
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with lock:
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cur = self.conn.cursor()
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try:
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if columns is None:
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cur.execute('''SELECT * FROM message''')
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return cur.fetchall()
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finally:
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cur.close()
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