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141 lines
4.2 KiB
Python
141 lines
4.2 KiB
Python
import sqlite3
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import contextlib
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import time
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from pathlib import Path
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class DBError(Exception):
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"""error during an operation on the database."""
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class Connection:
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def __init__(self, sqlconn, write):
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self._sqlconn = sqlconn
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self._write = write
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def close(self):
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self._sqlconn.close()
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def commit(self):
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self._sqlconn.commit()
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def rollback(self):
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self._sqlconn.rollback()
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def execute(self, query, params=()):
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cur = self.cursor()
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try:
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cur.execute(query, params)
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except sqlite3.IntegrityError as e:
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raise DBError(e)
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return cur
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def cursor(self):
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return self._sqlconn.cursor()
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def create_user(self, addr: str, password: str):
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"""Create a row in the users table."""
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self.execute("PRAGMA foreign_keys=on")
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q = """INSERT INTO users (addr, password, last_login)
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VALUES (?, ?, ?)"""
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self.execute(q, (addr, password, int(time.time())))
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def get_user(self, addr: str) -> {}:
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"""Get a row from the users table."""
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q = "SELECT addr, password, last_login from users WHERE addr = ?"
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row = self._sqlconn.execute(q, (addr,)).fetchone()
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result = {}
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if row:
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result = dict(
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user=row[0],
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password=row[1],
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last_login=row[2],
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)
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return result
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class Database:
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def __init__(self, path: str):
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self.path = Path(path)
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self.ensure_tables()
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def _get_connection(
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self, write=False, transaction=False, closing=False
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) -> Connection:
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# we let the database serialize all writers at connection time
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# to play it very safe (we don't have massive amounts of writes).
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mode = "ro"
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if write:
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mode = "rw"
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if not self.path.exists():
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mode = "rwc"
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uri = "file:%s?mode=%s" % (self.path, mode)
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sqlconn = sqlite3.connect(
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uri,
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timeout=60,
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isolation_level=None if transaction else "DEFERRED",
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uri=True,
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)
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# Enable Write-Ahead Logging to avoid readers blocking writers and vice versa.
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if write:
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sqlconn.execute("PRAGMA journal_mode=wal")
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if transaction:
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start_time = time.time()
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while 1:
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try:
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sqlconn.execute("begin immediate")
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break
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except sqlite3.OperationalError:
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# another thread may be writing, give it a chance to finish
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time.sleep(0.1)
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if time.time() - start_time > 5:
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# if it takes this long, something is wrong
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raise
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conn = Connection(sqlconn, write=write)
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if closing:
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conn = contextlib.closing(conn)
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return conn
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@contextlib.contextmanager
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def write_transaction(self):
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conn = self._get_connection(closing=False, write=True, transaction=True)
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try:
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yield conn
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except Exception:
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conn.rollback()
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conn.close()
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raise
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else:
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conn.commit()
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conn.close()
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def read_connection(self, closing=True) -> Connection:
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return self._get_connection(closing=closing, write=False)
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def get_schema_version(self) -> int:
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with self.read_connection() as conn:
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dbversion = conn.execute("PRAGMA user_version").fetchone()[0]
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return dbversion
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CURRENT_DBVERSION = 1
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def ensure_tables(self):
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with self.write_transaction() as conn:
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if self.get_schema_version() > 1:
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raise DBError(
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"version is %s; downgrading schema is not supported"
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% (self.get_schema_version(),)
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)
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conn.execute(
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"""
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CREATE TABLE IF NOT EXISTS users (
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addr TEXT PRIMARY KEY,
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password TEXT,
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last_login INTEGER
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)
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""",
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)
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conn.execute("PRAGMA user_version=%s" % (self.CURRENT_DBVERSION,))
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