Real-World Scenarios

import pyfuse3
import httpx
import trio

class NetworkFS(pyfuse3.Operations):
    """Filesystem backed by HTTP API."""
    
    def __init__(self, base_url):
        super().__init__()
        self.base_url = base_url
        self.client = httpx.AsyncClient()
        self.cache = {}
    
    async def read(self, fh, offset, size):
        """Read with caching and error recovery."""
        inode = self.open_files[fh]
        
        # Check cache
        if inode in self.cache:
            return self.cache[inode][offset:offset + size]
        
        # Fetch from network
        try:
            response = await self.client.get(f"{self.base_url}/files/{inode}")
            data = response.content
            self.cache[inode] = data
            return data[offset:offset + size]
        except httpx.RequestError as e:
            logger.error(f"Network error: {e}")
            raise pyfuse3.FUSEError(errno.EIO)

from cryptography.fernet import Fernet

class EncryptedFS(pyfuse3.Operations):
    """Filesystem with transparent encryption."""
    
    def __init__(self, key):
        super().__init__()
        self.cipher = Fernet(key)
    
    async def write(self, fh, offset, buf):
        """Encrypt before writing."""
        encrypted = self.cipher.encrypt(buf)
        # Write encrypted data
        return len(buf)
    
    async def read(self, fh, offset, size):
        """Decrypt after reading."""
        encrypted_data = self._read_encrypted(fh, offset, size)
        return self.cipher.decrypt(encrypted_data)