Russell Ballestrini
96a3c9c786
- Rewrite test_filevault.py for new API (depth=9, hex pairs, content-addressable) - Rewrite test_async_filevault.py to import from filevault module - Fix test_screenshot.py defaults (enabled=True, 1024x768) - Add backward compatibility exports to filevault.py - All 196 tests passing
661 lines
22 KiB
Python
661 lines
22 KiB
Python
"""
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FileVault 2.0.0 - Hash-based file storage with sync and async support
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A Vault manages a hash directory tree of files on a filesystem.
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Features:
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- Content-addressable storage (store by MD5 hash)
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- Seed-based deterministic paths (store by arbitrary key)
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- Configurable directory depth with hex pairs (256 dirs/level)
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- Thread-safe file locking (fcntl)
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- Atomic write operations
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- Optional in-memory existence cache
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- Both sync (Vault) and async (AsyncVault) implementations
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Usage:
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# Sync
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vault = Vault("vault", depth=9)
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path = vault.store(md5_hash, data, ".jpg")
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data = vault.get(md5_hash)
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# Async
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vault = AsyncVault("vault", depth=9)
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await vault.init()
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path = await vault.store(md5_hash, data, ".jpg")
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data = await vault.get(md5_hash)
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"""
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import asyncio
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import contextlib
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import fcntl
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import json
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import os
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import tempfile
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from hashlib import md5, sha256
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from os import makedirs, path, rename
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from pathlib import Path
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from typing import Any, Dict, List, Optional, Union
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from uuid import uuid4
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import aiofiles
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import aiofiles.os
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__version__ = "2.0.0"
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__author__ = "Russell Ballestrini"
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def _ensure_bytes(s: Union[str, bytes]) -> bytes:
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"""Convert string to bytes if needed."""
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if isinstance(s, str):
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return s.encode("utf-8")
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return s
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def _hash_to_path(h: str, depth: int, ext: str = "") -> Path:
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"""
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Convert hash to directory path using hex pairs.
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Example (depth=9): abcdef123456... -> ab/cd/ef/12/34/56/78/9a/bc/abcdef123456...ext
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"""
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parts = [h[i:i+2] for i in range(0, depth * 2, 2)]
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if ext and not ext.startswith('.'):
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ext = '.' + ext
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return Path(*parts) / f"{h}{ext}"
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class Vault:
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"""
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Synchronous hash-based file storage.
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Supports two modes:
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1. Content-addressable: store(hash, data) - use content's MD5 as key
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2. Seed-based: create_filename(seed) - deterministic path from arbitrary seed
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Directory structure uses hex pairs for 256 subdirs per level:
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vault/ab/cd/ef/.../hash.ext
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"""
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def __init__(
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self,
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vaultpath: str = "vault",
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depth: int = 9,
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salt: str = "neopig",
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enable_memory_cache: bool = False,
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):
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"""
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Initialize vault.
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Args:
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vaultpath: Base directory for storage
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depth: Directory tree depth (default 9 = 18 hex chars used)
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salt: Salt for seed-based hashing
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enable_memory_cache: Cache file existence checks in memory
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"""
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self.vaultpath = Path(vaultpath)
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self.depth = depth
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self.salt = _ensure_bytes(salt)
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self.enable_memory_cache = enable_memory_cache
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self._cache: Optional[Dict[str, bool]] = {} if enable_memory_cache else None
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def init(self) -> None:
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"""Create vault base directory."""
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self.vaultpath.mkdir(parents=True, exist_ok=True)
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# Backwards compatibility
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init_vault = init
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# -------------------------------------------------------------------------
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# Content-Addressable Storage (by hash)
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# -------------------------------------------------------------------------
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def _get_hash_path(self, h: str, ext: str = "") -> Path:
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"""Get full path for a content hash."""
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return self.vaultpath / _hash_to_path(h, self.depth, ext)
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def _find_by_hash(self, h: str) -> Optional[Path]:
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"""Find file by hash prefix (any extension)."""
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subdir = self._get_hash_path(h).parent
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if not subdir.exists():
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return None
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for f in subdir.iterdir():
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if f.name.startswith(h):
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return f
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return None
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def store(self, content_hash: str, data: bytes, ext: str = "") -> Path:
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"""
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Store data by content hash.
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Args:
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content_hash: MD5 hash of the data (32 hex chars)
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data: Raw bytes to store
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ext: File extension (e.g., ".jpg" or "jpg")
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Returns:
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Path to stored file
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"""
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filepath = self._get_hash_path(content_hash, ext)
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filepath.parent.mkdir(parents=True, exist_ok=True)
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with open(filepath, 'wb') as f:
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fcntl.flock(f.fileno(), fcntl.LOCK_EX)
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f.write(data)
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f.flush()
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os.fsync(f.fileno())
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self._cache_set(str(filepath), True)
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return filepath
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def exists(self, content_hash: str) -> bool:
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"""Check if content exists by hash."""
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return self._find_by_hash(content_hash) is not None
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def get(self, content_hash: str) -> Optional[bytes]:
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"""Retrieve data by content hash."""
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filepath = self._find_by_hash(content_hash)
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if filepath is None:
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return None
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with open(filepath, 'rb') as f:
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fcntl.flock(f.fileno(), fcntl.LOCK_SH)
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return f.read()
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def get_path(self, content_hash: str) -> Optional[Path]:
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"""Get filesystem path for stored content."""
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return self._find_by_hash(content_hash)
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def delete(self, content_hash: str) -> bool:
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"""Delete content by hash. Returns True if deleted."""
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filepath = self._find_by_hash(content_hash)
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if filepath is None:
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return False
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filepath.unlink()
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self._cache_set(str(filepath), False)
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return True
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# -------------------------------------------------------------------------
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# Seed-Based Storage (deterministic paths from arbitrary keys)
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# -------------------------------------------------------------------------
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def create_filename(self, seed: str, ext: str = "", absolute: bool = True) -> str:
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"""
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Create deterministic path from seed string.
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Args:
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seed: Arbitrary string to hash
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ext: File extension
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absolute: Include vault base path
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Returns:
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Path string
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"""
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h = sha256(_ensure_bytes(seed) + self.salt).hexdigest()
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rel_path = _hash_to_path(h, self.depth, ext)
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if absolute:
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return str(self.vaultpath / rel_path)
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return str(rel_path)
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def create_random_filename(self, ext: str = "", absolute: bool = True) -> str:
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"""Create random vault path."""
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return self.create_filename(str(uuid4()), ext, absolute)
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# -------------------------------------------------------------------------
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# File Operations with Locking
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# -------------------------------------------------------------------------
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@contextlib.contextmanager
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def file_lock(self, file_path: str, mode: str = "r"):
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"""
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Context manager for locked file access.
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Args:
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file_path: Path to file
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mode: Open mode ('r', 'w', 'a', etc.)
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Yields:
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Locked file object
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"""
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p = Path(file_path)
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if "w" in mode or "a" in mode:
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p.parent.mkdir(parents=True, exist_ok=True)
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lock_type = fcntl.LOCK_EX if ("w" in mode or "a" in mode) else fcntl.LOCK_SH
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with open(file_path, mode) as f:
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try:
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fcntl.flock(f.fileno(), lock_type)
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yield f
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finally:
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fcntl.flock(f.fileno(), fcntl.LOCK_UN)
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def write_bytes(self, file_path: str, data: bytes) -> None:
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"""Write bytes with locking."""
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p = Path(file_path)
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p.parent.mkdir(parents=True, exist_ok=True)
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with open(file_path, 'wb') as f:
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fcntl.flock(f.fileno(), fcntl.LOCK_EX)
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f.write(data)
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f.flush()
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os.fsync(f.fileno())
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self._cache_set(file_path, True)
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def read_bytes(self, file_path: str) -> Optional[bytes]:
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"""Read bytes with locking."""
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if not path.exists(file_path):
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return None
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with open(file_path, 'rb') as f:
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fcntl.flock(f.fileno(), fcntl.LOCK_SH)
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return f.read()
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def write_text(self, file_path: str, content: str) -> None:
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"""Write text with locking."""
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p = Path(file_path)
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p.parent.mkdir(parents=True, exist_ok=True)
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with open(file_path, 'w') as f:
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fcntl.flock(f.fileno(), fcntl.LOCK_EX)
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f.write(content)
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f.flush()
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os.fsync(f.fileno())
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self._cache_set(file_path, True)
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def read_text(self, file_path: str, default: str = None) -> Optional[str]:
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"""Read text with locking."""
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if not path.exists(file_path):
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return default
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with open(file_path, 'r') as f:
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fcntl.flock(f.fileno(), fcntl.LOCK_SH)
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return f.read()
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def write_json(self, file_path: str, data: Any, indent: int = 2) -> None:
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"""Atomically write JSON with temp file + rename."""
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p = Path(file_path)
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p.parent.mkdir(parents=True, exist_ok=True)
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fd, temp_path = tempfile.mkstemp(
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dir=str(p.parent),
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prefix=f".tmp_{p.name}_",
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suffix=".json"
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)
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try:
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with open(temp_path, 'w') as f:
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fcntl.flock(f.fileno(), fcntl.LOCK_EX)
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json.dump(data, f, indent=indent)
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f.flush()
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os.fsync(f.fileno())
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rename(temp_path, file_path)
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self._cache_set(file_path, True)
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except Exception:
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try:
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os.unlink(temp_path)
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except OSError:
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pass
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raise
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finally:
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try:
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os.close(fd)
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except OSError:
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pass
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def read_json(self, file_path: str, default: Any = None) -> Any:
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"""Read JSON with locking."""
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if not path.exists(file_path):
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return default
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try:
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with self.file_lock(file_path, 'r') as f:
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return json.load(f)
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except (json.JSONDecodeError, IOError):
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return default
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def remove(self, file_path: str) -> bool:
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"""Remove file. Returns True if removed."""
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if not path.exists(file_path):
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self._cache_set(file_path, False)
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return False
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os.remove(file_path)
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self._cache_set(file_path, False)
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return True
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# -------------------------------------------------------------------------
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# Existence Cache
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# -------------------------------------------------------------------------
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def _cache_set(self, file_path: str, exists: bool) -> None:
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"""Update existence cache."""
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if self._cache is not None:
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self._cache[file_path] = exists
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def _cache_get(self, file_path: str) -> Optional[bool]:
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"""Check existence cache."""
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if self._cache is not None:
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return self._cache.get(file_path)
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return None
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def file_exists(self, file_path: str) -> bool:
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"""Check if file exists (uses cache if enabled)."""
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cached = self._cache_get(file_path)
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if cached is not None:
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return cached
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exists = path.exists(file_path)
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self._cache_set(file_path, exists)
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return exists
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def clear_cache(self) -> None:
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"""Clear existence cache."""
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if self._cache is not None:
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self._cache.clear()
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# -------------------------------------------------------------------------
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# Statistics
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# -------------------------------------------------------------------------
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def stats(self) -> Dict[str, Any]:
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"""Get vault statistics."""
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count = 0
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total_size = 0
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for f in self.vaultpath.rglob('*'):
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if f.is_file():
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count += 1
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total_size += f.stat().st_size
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return {
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'path': str(self.vaultpath),
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'depth': self.depth,
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'count': count,
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'total_size': total_size,
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'cache_enabled': self.enable_memory_cache,
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'cache_entries': len(self._cache) if self._cache else 0,
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}
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# Backwards compatibility aliases
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atomic_write_json = write_json
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safe_read_json = read_json
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write_text_file = write_text
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read_text_file = read_text
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remove_file = remove
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mark_file_exists = _cache_set
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class AsyncVault:
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"""
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Asynchronous hash-based file storage.
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Same API as Vault but with async/await. Uses aiofiles for I/O
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and asyncio.to_thread for CPU-bound operations.
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"""
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def __init__(
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self,
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vaultpath: str = "vault",
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depth: int = 9,
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salt: str = "neopig",
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enable_memory_cache: bool = False,
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):
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"""
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Initialize async vault.
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Args:
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vaultpath: Base directory for storage
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depth: Directory tree depth (default 9)
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salt: Salt for seed-based hashing
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enable_memory_cache: Cache file existence checks in memory
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"""
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self.vaultpath = Path(vaultpath)
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self.depth = depth
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self.salt = _ensure_bytes(salt)
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self.enable_memory_cache = enable_memory_cache
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self._cache: Optional[Dict[str, bool]] = {} if enable_memory_cache else None
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self._initialized = False
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async def init(self) -> None:
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"""Create vault base directory."""
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if self._initialized:
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return
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await aiofiles.os.makedirs(self.vaultpath, exist_ok=True)
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self._initialized = True
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# -------------------------------------------------------------------------
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# Content-Addressable Storage (by hash)
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# -------------------------------------------------------------------------
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def _get_hash_path(self, h: str, ext: str = "") -> Path:
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"""Get full path for a content hash."""
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return self.vaultpath / _hash_to_path(h, self.depth, ext)
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async def _find_by_hash(self, h: str) -> Optional[Path]:
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"""Find file by hash prefix (any extension)."""
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subdir = self._get_hash_path(h).parent
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def _find():
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if not subdir.exists():
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return None
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for f in subdir.iterdir():
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if f.name.startswith(h):
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return f
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return None
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return await asyncio.to_thread(_find)
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async def store(self, content_hash: str, data: bytes, ext: str = "") -> Path:
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"""
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Store data by content hash.
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Args:
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content_hash: MD5 hash of the data (32 hex chars)
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data: Raw bytes to store
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ext: File extension (e.g., ".jpg" or "jpg")
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Returns:
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Path to stored file
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"""
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filepath = self._get_hash_path(content_hash, ext)
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await aiofiles.os.makedirs(filepath.parent, exist_ok=True)
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async with aiofiles.open(filepath, 'wb') as f:
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await f.write(data)
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self._cache_set(str(filepath), True)
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return filepath
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async def exists(self, content_hash: str) -> bool:
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"""Check if content exists by hash."""
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return await self._find_by_hash(content_hash) is not None
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async def get(self, content_hash: str) -> Optional[bytes]:
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"""Retrieve data by content hash."""
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filepath = await self._find_by_hash(content_hash)
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if filepath is None:
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return None
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async with aiofiles.open(filepath, 'rb') as f:
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return await f.read()
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async def get_path(self, content_hash: str) -> Optional[Path]:
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"""Get filesystem path for stored content."""
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return await self._find_by_hash(content_hash)
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async def delete(self, content_hash: str) -> bool:
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"""Delete content by hash. Returns True if deleted."""
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filepath = await self._find_by_hash(content_hash)
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if filepath is None:
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return False
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await aiofiles.os.remove(filepath)
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self._cache_set(str(filepath), False)
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return True
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# -------------------------------------------------------------------------
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# Seed-Based Storage
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# -------------------------------------------------------------------------
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def create_filename(self, seed: str, ext: str = "", absolute: bool = True) -> str:
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"""Create deterministic path from seed string."""
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h = sha256(_ensure_bytes(seed) + self.salt).hexdigest()
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rel_path = _hash_to_path(h, self.depth, ext)
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if absolute:
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return str(self.vaultpath / rel_path)
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return str(rel_path)
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def create_random_filename(self, ext: str = "", absolute: bool = True) -> str:
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"""Create random vault path."""
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return self.create_filename(str(uuid4()), ext, absolute)
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# -------------------------------------------------------------------------
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# File Operations
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# -------------------------------------------------------------------------
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async def write_bytes(self, file_path: str, data: bytes) -> None:
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"""Write bytes."""
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p = Path(file_path)
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await aiofiles.os.makedirs(p.parent, exist_ok=True)
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async with aiofiles.open(file_path, 'wb') as f:
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await f.write(data)
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self._cache_set(file_path, True)
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async def read_bytes(self, file_path: str) -> Optional[bytes]:
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"""Read bytes."""
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if not await aiofiles.os.path.exists(file_path):
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return None
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async with aiofiles.open(file_path, 'rb') as f:
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return await f.read()
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async def write_text(self, file_path: str, content: str) -> None:
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"""Write text."""
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p = Path(file_path)
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await aiofiles.os.makedirs(p.parent, exist_ok=True)
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async with aiofiles.open(file_path, 'w') as f:
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await f.write(content)
|
|
self._cache_set(file_path, True)
|
|
|
|
async def read_text(self, file_path: str, default: str = None) -> Optional[str]:
|
|
"""Read text."""
|
|
if not await aiofiles.os.path.exists(file_path):
|
|
return default
|
|
async with aiofiles.open(file_path, 'r') as f:
|
|
return await f.read()
|
|
|
|
async def write_json(self, file_path: str, data: Any, indent: int = 2) -> None:
|
|
"""Atomically write JSON."""
|
|
p = Path(file_path)
|
|
await aiofiles.os.makedirs(p.parent, exist_ok=True)
|
|
|
|
# Create temp file
|
|
fd, temp_path = await asyncio.to_thread(
|
|
tempfile.mkstemp,
|
|
dir=str(p.parent),
|
|
prefix=f".tmp_{p.name}_",
|
|
suffix=".json"
|
|
)
|
|
try:
|
|
async with aiofiles.open(temp_path, 'w') as f:
|
|
await f.write(json.dumps(data, indent=indent))
|
|
|
|
await asyncio.to_thread(rename, temp_path, file_path)
|
|
self._cache_set(file_path, True)
|
|
except Exception:
|
|
try:
|
|
await aiofiles.os.remove(temp_path)
|
|
except OSError:
|
|
pass
|
|
raise
|
|
finally:
|
|
try:
|
|
os.close(fd)
|
|
except OSError:
|
|
pass
|
|
|
|
async def read_json(self, file_path: str, default: Any = None) -> Any:
|
|
"""Read JSON."""
|
|
if not await aiofiles.os.path.exists(file_path):
|
|
return default
|
|
try:
|
|
async with aiofiles.open(file_path, 'r') as f:
|
|
return json.loads(await f.read())
|
|
except (json.JSONDecodeError, IOError):
|
|
return default
|
|
|
|
async def remove(self, file_path: str) -> bool:
|
|
"""Remove file. Returns True if removed."""
|
|
if not await aiofiles.os.path.exists(file_path):
|
|
self._cache_set(file_path, False)
|
|
return False
|
|
await aiofiles.os.remove(file_path)
|
|
self._cache_set(file_path, False)
|
|
return True
|
|
|
|
# -------------------------------------------------------------------------
|
|
# Existence Cache
|
|
# -------------------------------------------------------------------------
|
|
|
|
def _cache_set(self, file_path: str, exists: bool) -> None:
|
|
"""Update existence cache."""
|
|
if self._cache is not None:
|
|
self._cache[file_path] = exists
|
|
|
|
def _cache_get(self, file_path: str) -> Optional[bool]:
|
|
"""Check existence cache."""
|
|
if self._cache is not None:
|
|
return self._cache.get(file_path)
|
|
return None
|
|
|
|
async def file_exists(self, file_path: str) -> bool:
|
|
"""Check if file exists (uses cache if enabled)."""
|
|
cached = self._cache_get(file_path)
|
|
if cached is not None:
|
|
return cached
|
|
exists = await aiofiles.os.path.exists(file_path)
|
|
self._cache_set(file_path, exists)
|
|
return exists
|
|
|
|
def clear_cache(self) -> None:
|
|
"""Clear existence cache."""
|
|
if self._cache is not None:
|
|
self._cache.clear()
|
|
|
|
# -------------------------------------------------------------------------
|
|
# Statistics
|
|
# -------------------------------------------------------------------------
|
|
|
|
async def stats(self) -> Dict[str, Any]:
|
|
"""Get vault statistics."""
|
|
def _count():
|
|
count = 0
|
|
total_size = 0
|
|
for f in self.vaultpath.rglob('*'):
|
|
if f.is_file():
|
|
count += 1
|
|
total_size += f.stat().st_size
|
|
return count, total_size
|
|
|
|
count, total_size = await asyncio.to_thread(_count)
|
|
return {
|
|
'path': str(self.vaultpath),
|
|
'depth': self.depth,
|
|
'count': count,
|
|
'total_size': total_size,
|
|
'cache_enabled': self.enable_memory_cache,
|
|
'cache_entries': len(self._cache) if self._cache else 0,
|
|
}
|
|
|
|
|
|
def content_hash(data: bytes) -> str:
|
|
"""Generate MD5 hash of bytes for content-addressable storage."""
|
|
return md5(data).hexdigest()
|
|
|
|
|
|
def hash_to_path(h: str, depth: int = 9, ext: str = "") -> Path:
|
|
"""
|
|
Convert hash to directory path using hex pairs.
|
|
|
|
Example (depth=9): abcdef123456... -> ab/cd/ef/12/34/56/78/9a/bc/abcdef123456...ext
|
|
"""
|
|
return _hash_to_path(h, depth, ext)
|
|
|
|
|
|
# Backward compatibility exports
|
|
ensure_bytes = _ensure_bytes
|
|
|
|
|
|
def create_vault(*args, **kwargs) -> Vault:
|
|
"""Factory function for Vault (backward compatibility)."""
|
|
return Vault(*args, **kwargs)
|
|
|
|
|
|
def create_async_vault(*args, **kwargs) -> AsyncVault:
|
|
"""Factory function for AsyncVault (backward compatibility)."""
|
|
return AsyncVault(*args, **kwargs)
|