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"""
Virtual SSD Main Module - Integrates all components
"""
import os
import shutil
import json
import base64
from typing import Optional, Dict
from builtins import open
from .virtual_flash import VirtualFlash
from .file_system_map import FileSystemMap
from .ssd_controller import SSDController
from .virtual_ram_buffer import VirtualRAMBuffer
from .virtual_driver import VirtualDriver
from .virtual_os import VirtualOS
from .app_interface import AppInterface
from .persistent_virtual_disk import PersistentVirtualDisk
from .volatile_virtual_disk import VolatileVirtualDisk
class VirtualSSD:
"""
Main class to integrate all virtual SSD components.
Provides mount, shutdown, and application-level file operations.
"""
def __init__(self, capacity_gb: int = 2048, page_size: int = 4096, pages_per_block: int = 256):
self.capacity_gb = capacity_gb
self.page_size = page_size
self.pages_per_block = pages_per_block
# Calculate total logical blocks based on capacity and page size
# Assuming 1 logical block = 1 page for simplicity in initial FTL
self.total_logical_blocks = (capacity_gb * 1024 * 1024 * 1024) // page_size
self.flash: Optional[VirtualFlash] = None
self.ram_buffer: Optional[VirtualRAMBuffer] = None
self.controller: Optional[SSDController] = None
self.file_system: Optional[FileSystemMap] = None
self.driver: Optional[VirtualDriver] = None
self.os: Optional[VirtualOS] = None
self.app_interface: Optional[AppInterface] = None
self.mounted = False
# Persistent Virtual Disk
self.pvd = PersistentVirtualDisk(capacity_gb, page_size, pages_per_block)
self.vvd: Optional[VolatileVirtualDisk] = None
print("VirtualSSD instance created.")
def mount(self):
"""
Mount the virtual SSD, initializing all components.
"""
if self.mounted:
print("Virtual SSD already mounted.")
return
print("Mounting Virtual SSD...")
# Ensure storage directory exists for snapshot
os.makedirs("virtual_ssd_data", exist_ok=True)
try:
# Load PVD state
pvd_snapshot_path = os.path.join("virtual_ssd_data", "pvd_snapshot.json")
pvd_snapshot_data = None
if os.path.exists(pvd_snapshot_path):
with open(pvd_snapshot_path, 'r') as f:
pvd_snapshot_data = json.load(f)
self.pvd.load_from_storage(pvd_snapshot_data['pvd_state'])
else:
self.pvd.load_from_storage() # Initialize fresh state
self.flash = self.pvd.get_flash()
self.controller = self.pvd.get_controller()
self.file_system = self.pvd.get_file_system()
self.vvd = VolatileVirtualDisk(self.flash, self.file_system, self.controller)
self.ram_buffer = VirtualRAMBuffer(capacity_bytes=128 * 1024 * 1024) # 128MB buffer
self.driver = VirtualDriver(self.vvd, self.page_size) # Driver interacts with VVD
self.os = VirtualOS(self.file_system, self.driver, self.ram_buffer)
self.app_interface = AppInterface(self.os)
self.mounted = True
print("Virtual SSD mounted successfully.")
except Exception as e:
print(f"Error mounting Virtual SSD: {e}")
self.shutdown() # Attempt to clean up
self.mounted = False
def shutdown(self):
"""
Shutdown the virtual SSD, saving all states to a snapshot.
"""
if not self.mounted:
print("Virtual SSD not mounted.")
return
print("Shutting down Virtual SSD...")
try:
if self.app_interface:
self.app_interface.sync() # Ensure all data is flushed
if self.vvd:
self.vvd.shutdown() # Flush dirty pages to PVD
if self.os:
self.os.shutdown()
if self.driver:
self.driver.shutdown()
# Save PVD state
os.makedirs("virtual_ssd_data", exist_ok=True) # Ensure directory exists
pvd_snapshot_path = os.path.join("virtual_ssd_data", "pvd_snapshot.json")
pvd_state = self.pvd.save_to_storage()
with open(pvd_snapshot_path, 'w') as f:
json.dump({"pvd_state": pvd_state}, f, indent=2)
print(f"PVD state saved to snapshot: {pvd_snapshot_path}")
self.pvd.shutdown()
self.mounted = False
print("Virtual SSD shutdown complete.")
except Exception as e:
print(f"Error during Virtual SSD shutdown: {e}")
def save_file(self, filename: str, data: bytes) -> bool:
"""
Save a file to the virtual SSD.
"""
if not self.mounted or not self.app_interface:
print("Error: Virtual SSD not mounted.")
return False
return self.app_interface.save(filename, data)
def read_file(self, filename: str) -> Optional[bytes]:
"""
Read a file from the virtual SSD.
"""
if not self.mounted or not self.app_interface:
print("Error: Virtual SSD not mounted.")
return None
return self.app_interface.load(filename)
def delete_file(self, filename: str) -> bool:
"""
Delete a file from the virtual SSD.
"""
if not self.mounted or not self.app_interface:
print("Error: Virtual SSD not mounted.")
return False
return self.app_interface.delete(filename)
def list_files(self) -> Dict:
"""
List all files and their metadata on the virtual SSD.
"""
if not self.mounted or not self.app_interface:
print("Error: Virtual SSD not mounted.")
return {}
return self.app_interface.list_files()
def get_capacity_info(self) -> Dict:
"""
Get capacity information of the virtual SSD.
"""
if not self.mounted or not self.app_interface:
print("Error: Virtual SSD not mounted.")
return {}
return self.app_interface.get_capacity_info()
def get_full_stats(self) -> Dict:
"""
Get comprehensive statistics from all layers.
"""
if not self.mounted or not self.app_interface or not self.os or not self.flash or not self.controller:
print("Error: Virtual SSD not mounted or components missing.")
return {}
return {
"flash_stats": self.flash.get_flash_stats(),
"ftl_stats": self.controller.get_ftl_stats(),
"file_system_stats": self.file_system.get_usage_stats(),
"ram_buffer_stats": self.ram_buffer.get_buffer_status()
}
def format_ssd(self):
"""
Formats the virtual SSD, deleting all data and resetting state.
"""
if self.mounted:
self.shutdown()
print("Formatting Virtual SSD...")
storage_dir = "virtual_ssd_data"
if os.path.exists(storage_dir):
shutil.rmtree(storage_dir)
print(f"Removed existing storage directory: {storage_dir}")
self.pvd = PersistentVirtualDisk(self.capacity_gb, self.page_size, self.pages_per_block)
self.pvd.format_disk()
self.flash = self.pvd.get_flash()
self.controller = self.pvd.get_controller()
self.file_system = self.pvd.get_file_system()
self.ram_buffer = VirtualRAMBuffer(capacity_bytes=128 * 1024 * 1024)
self.driver = VirtualDriver(self.controller, self.page_size)
self.os = VirtualOS(self.file_system, self.driver, self.ram_buffer)
self.app_interface = AppInterface(self.os)
self.mounted = True
print("Virtual SSD formatted and re-mounted.")
def __del__(self):
"""
Ensure shutdown is called on object deletion.
"""
try:
if self.mounted:
self.shutdown()
except:
pass
if __name__ == "__main__":
# Example Usage
ssd = VirtualSSD(capacity_gb=2) # Create a 2GB virtual SSD for testing
ssd.mount()
# Test file operations
test_data_small = b"Hello, this is a small test file." * 10 # 330 bytes
test_data_large = b"This is a larger test file content." * 1000 # 35KB
test_data_very_large = b"A very large file for testing purposes. " * 100000 # ~4MB
print("\n--- Testing file saves ---")
ssd.save_file("small_file.txt", test_data_small)
ssd.save_file("large_file.bin", test_data_large)
ssd.save_file("video.mp4", test_data_very_large)
ssd.save_file("another_file.txt", b"Some more data.")
# Upload the created test file
with open("/home/ubuntu/test_upload_file.txt", "rb") as f:
uploaded_data = f.read()
ssd.save_file("uploaded_test_file.txt", uploaded_data)
print("Uploaded test_upload_file.txt to virtual SSD.")
print("\n--- Listing files ---")
files = ssd.list_files()
for filename, info in files.items():
print(f"File: {filename}, Size: {info['size']} bytes, Blocks: {len(info['blocks'])}")
print("\n--- Checking capacity info ---")
capacity_info = ssd.get_capacity_info()
print(f"Total: {capacity_info['total_gb']} GB, Used: {capacity_info['used_gb']} GB, Free: {capacity_info['free_gb']} GB, Usage: {capacity_info['usage_percent']:.2f}%")
print("\n--- Reading files ---")
read_small_data = ssd.read_file("small_file.txt")
print(f"Read small_file.txt: {read_small_data[:50]}...")
assert read_small_data == test_data_small
read_large_data = ssd.read_file("large_file.bin")
print(f"Read large_file.bin: {read_large_data[:50]}...")
assert read_large_data == test_data_large
read_video_data = ssd.read_file("video.mp4")
print(f"Read video.mp4: {read_video_data[:50]}...")
assert read_video_data == test_data_very_large
read_uploaded_data = ssd.read_file("uploaded_test_file.txt")
print(f"Read uploaded_test_file.txt: {read_uploaded_data[:50]}...")
assert read_uploaded_data == uploaded_data
print("\n--- Deleting a file ---")
ssd.delete_file("large_file.bin")
print("\n--- Listing files after deletion ---")
files = ssd.list_files()
for filename, info in files.items():
print(f"File: {filename}, Size: {info['size']} bytes, Blocks: {len(info['blocks'])}")
print("\n--- Checking capacity info after deletion ---")
capacity_info = ssd.get_capacity_info()
print(f"Total: {capacity_info['total_gb']} GB, Used: {capacity_info['used_gb']} GB, Free: {capacity_info['free_gb']} GB, Usage: {capacity_info['usage_percent']:.2f}%")
print("\n--- Testing persistence ---")
ssd.shutdown()
print("SSD shut down. Re-mounting to check persistence.")
ssd_reloaded = VirtualSSD(capacity_gb=2) # Same capacity
ssd_reloaded.mount()
print("\n--- Listing files after re-mount ---")
files_reloaded = ssd_reloaded.list_files()
for filename, info in files_reloaded.items():
print(f"File: {filename}, Size: {info['size']} bytes, Blocks: {len(info['blocks'])}")
read_small_data_reloaded = ssd_reloaded.read_file("small_file.txt")
assert read_small_data_reloaded == test_data_small
print("small_file.txt read successfully after remount.")
read_uploaded_data_reloaded = ssd_reloaded.read_file("uploaded_test_file.txt")
assert read_uploaded_data_reloaded == uploaded_data
print("uploaded_test_file.txt read successfully after remount.")
# Test formatting
print("\n--- Testing format ---")
ssd_reloaded.format_ssd()
print("\n--- Listing files after format ---")
files_after_format = ssd_reloaded.list_files()
print(f"Files after format: {files_after_format}")
assert not files_after_format
ssd_reloaded.shutdown()
print("All tests complete.")
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