Добавлено описание проекта PVideoDl, включая функциональность, стек технологий, архитектуру, инструкции по запуску и API. Обновлён README.md для лучшего понимания проекта.

2026-06-19 12:07:55 +03:00
parent e15d0af056
commit 3281fa2a5d
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+"""Абстракция хранилища загрузок.
+
+Интерфейс Storage + реализация на aiosqlite. Сегодня SQLite, завтра Postgres —
+сервисы и роуты зовут только методы Storage и не знают о бэкенде.
+"""
+
+from __future__ import annotations
+
+import json
+from abc import ABC, abstractmethod
+from datetime import datetime
+from pathlib import Path
+from typing import Any
+
+import aiosqlite
+
+from app.models import Download, DownloadStatus
+
+
+class Storage(ABC):
+    @abstractmethod
+    async def init(self) -> None: ...
+
+    @abstractmethod
+    async def close(self) -> None: ...
+
+    @abstractmethod
+    async def create(self, download: Download) -> None: ...
+
+    @abstractmethod
+    async def update(self, download_id: str, **fields: Any) -> Download | None: ...
+
+    @abstractmethod
+    async def get(self, download_id: str) -> Download | None: ...
+
+    @abstractmethod
+    async def list(self) -> list[Download]: ...
+
+    @abstractmethod
+    async def delete(self, download_id: str) -> bool: ...
+
+
+_COLUMNS = (
+    "id",
+    "url",
+    "filename",
+    "status",
+    "progress",
+    "size_bytes",
+    "downloaded_bytes",
+    "speed",
+    "eta",
+    "error",
+    "created_at",
+)
+
+
+def _row_to_download(row: aiosqlite.Row) -> Download:
+    data = dict(row)
+    data["status"] = DownloadStatus(data["status"])
+    data["created_at"] = datetime.fromisoformat(data["created_at"])
+    return Download.model_validate(data)
+
+
+def _to_db_value(key: str, value: Any) -> Any:
+    if isinstance(value, DownloadStatus):
+        return value.value
+    if isinstance(value, datetime):
+        return value.isoformat()
+    return value
+
+
+class SqliteStorage(Storage):
+    def __init__(self, db_path: Path) -> None:
+        self._db_path = db_path
+        self._db: aiosqlite.Connection | None = None
+
+    @property
+    def _conn(self) -> aiosqlite.Connection:
+        if self._db is None:
+            raise RuntimeError("Storage не инициализирован — вызовите init()")
+        return self._db
+
+    async def init(self) -> None:
+        self._db_path.parent.mkdir(parents=True, exist_ok=True)
+        self._db = await aiosqlite.connect(self._db_path)
+        self._db.row_factory = aiosqlite.Row
+        await self._db.execute(
+            """
+            CREATE TABLE IF NOT EXISTS downloads (
+                id               TEXT PRIMARY KEY,
+                url              TEXT NOT NULL,
+                filename         TEXT,
+                status           TEXT NOT NULL,
+                progress         REAL NOT NULL DEFAULT 0,
+                size_bytes       INTEGER,
+                downloaded_bytes INTEGER NOT NULL DEFAULT 0,
+                speed            REAL,
+                eta              REAL,
+                error            TEXT,
+                created_at       TEXT NOT NULL
+            )
+            """
+        )
+        # На старте всё, что осталось "качающимся" после прошлого запуска,
+        # помечаем упавшим — воркеры этого процесса о них не знают.
+        await self._db.execute(
+            "UPDATE downloads SET status = ?, error = ? WHERE status = ?",
+            (
+                DownloadStatus.FAILED.value,
+                "Прервано при перезапуске приложения",
+                DownloadStatus.DOWNLOADING.value,
+            ),
+        )
+        await self._db.commit()
+
+    async def close(self) -> None:
+        if self._db is not None:
+            await self._db.close()
+            self._db = None
+
+    async def create(self, download: Download) -> None:
+        await self._conn.execute(
+            f"INSERT INTO downloads ({', '.join(_COLUMNS)}) "
+            f"VALUES ({', '.join('?' for _ in _COLUMNS)})",
+            tuple(_to_db_value(c, getattr(download, c)) for c in _COLUMNS),
+        )
+        await self._conn.commit()
+
+    async def update(self, download_id: str, **fields: Any) -> Download | None:
+        if not fields:
+            return await self.get(download_id)
+        allowed = {k: v for k, v in fields.items() if k in _COLUMNS and k != "id"}
+        if not allowed:
+            return await self.get(download_id)
+        assignments = ", ".join(f"{k} = ?" for k in allowed)
+        params = [_to_db_value(k, v) for k, v in allowed.items()]
+        params.append(download_id)
+        await self._conn.execute(
+            f"UPDATE downloads SET {assignments} WHERE id = ?", params
+        )
+        await self._conn.commit()
+        return await self.get(download_id)
+
+    async def get(self, download_id: str) -> Download | None:
+        async with self._conn.execute(
+            "SELECT * FROM downloads WHERE id = ?", (download_id,)
+        ) as cursor:
+            row = await cursor.fetchone()
+        return _row_to_download(row) if row else None
+
+    async def list(self) -> list[Download]:
+        async with self._conn.execute(
+            "SELECT * FROM downloads ORDER BY created_at DESC"
+        ) as cursor:
+            rows = await cursor.fetchall()
+        return [_row_to_download(r) for r in rows]
+
+    async def delete(self, download_id: str) -> bool:
+        cursor = await self._conn.execute(
+            "DELETE FROM downloads WHERE id = ?", (download_id,)
+        )
+        await self._conn.commit()
+        return cursor.rowcount > 0