vvzvlad
57a96044bc
Add a new `mime_type` column to the media_file_ids table and provide functions to get and set cached MIME types. The API now attempts to retrieve the MIME type from the database before falling back to python-magic, persisting the detected type for future requests. This reduces I/O overhead and improves response performance. Also adjust logging to debug level to reduce noise.
120 lines
4.4 KiB
Python
120 lines
4.4 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# flake8: noqa
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# pylint: disable=missing-function-docstring
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import os
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import sqlite3
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from contextlib import contextmanager
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from typing import List
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# Path to SQLite database file
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DB_PATH = os.path.join(os.path.abspath("./data"), "media_file_ids.db")
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def _open_db(db_path: str) -> sqlite3.Connection:
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"""Open a SQLite connection with WAL journal mode enabled."""
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conn = sqlite3.connect(db_path)
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conn.execute("PRAGMA journal_mode=WAL")
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return conn
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@contextmanager
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def _db_connection(db_path: str):
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"""Context manager that opens a WAL-mode SQLite connection and ensures it is closed."""
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conn = _open_db(db_path)
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try:
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yield conn
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conn.commit()
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except Exception:
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conn.rollback()
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raise
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finally:
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conn.close()
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def init_db_sync(db_path: str) -> None:
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"""Create the media_file_ids table if it does not exist."""
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with _db_connection(db_path) as conn:
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conn.execute(
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"""
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CREATE TABLE IF NOT EXISTS media_file_ids (
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channel TEXT NOT NULL,
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post_id INTEGER NOT NULL,
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file_unique_id TEXT NOT NULL,
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added REAL NOT NULL,
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PRIMARY KEY (channel, post_id, file_unique_id)
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)
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"""
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)
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# Add mime_type column if it does not exist yet (idempotent migration)
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try:
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conn.execute("ALTER TABLE media_file_ids ADD COLUMN mime_type TEXT")
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except sqlite3.OperationalError as e:
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if "duplicate column name" not in str(e):
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raise # Re-raise any OperationalError that is not "duplicate column name"
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def upsert_media_file_id_sync(db_path: str, channel: str, post_id: int, file_unique_id: str, added: float) -> None:
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"""Insert or replace a single media file ID record."""
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with _db_connection(db_path) as conn:
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conn.execute(
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"""INSERT INTO media_file_ids (channel, post_id, file_unique_id, added)
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VALUES (?, ?, ?, ?)
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ON CONFLICT(channel, post_id, file_unique_id)
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DO UPDATE SET added = excluded.added""",
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(channel, post_id, file_unique_id, added),
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)
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def update_media_file_access_sync(db_path: str, channel: str, post_id: int, file_unique_id: str, added: float) -> None:
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"""Update the access timestamp for an existing media file ID record."""
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with _db_connection(db_path) as conn:
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conn.execute(
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"UPDATE media_file_ids SET added = ? WHERE channel = ? AND post_id = ? AND file_unique_id = ?",
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(added, channel, post_id, file_unique_id),
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)
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def get_all_media_file_ids_sync(db_path: str) -> List[dict]:
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"""Return all rows from media_file_ids as a list of dicts."""
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with _db_connection(db_path) as conn:
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conn.row_factory = sqlite3.Row
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cursor = conn.execute("SELECT channel, post_id, file_unique_id, added FROM media_file_ids")
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rows = cursor.fetchall()
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return [dict(row) for row in rows]
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def remove_media_file_ids_sync(db_path: str, entries: List[tuple]) -> None:
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"""Remove media file ID records identified by (channel, post_id, file_unique_id) tuples."""
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with _db_connection(db_path) as conn:
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conn.executemany(
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"DELETE FROM media_file_ids WHERE channel = ? AND post_id = ? AND file_unique_id = ?",
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entries,
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)
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def get_mime_type_sync(db_path: str, channel: str, post_id: int, file_unique_id: str) -> str | None:
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"""Return the cached MIME type for a given media key, or None if not stored yet."""
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with _db_connection(db_path) as conn:
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cursor = conn.execute(
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"SELECT mime_type FROM media_file_ids WHERE channel = ? AND post_id = ? AND file_unique_id = ?",
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(channel, post_id, file_unique_id),
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)
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row = cursor.fetchone()
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if row is None:
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return None
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return row[0] # May be None if the column value was never set
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def set_mime_type_sync(db_path: str, channel: str, post_id: int, file_unique_id: str, mime_type: str) -> None:
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"""Persist a detected MIME type for an existing media file ID record."""
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with _db_connection(db_path) as conn:
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conn.execute(
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"UPDATE media_file_ids SET mime_type = ? WHERE channel = ? AND post_id = ? AND file_unique_id = ?",
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(mime_type, channel, post_id, file_unique_id),
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)
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