134 lines
4.1 KiB
Python
134 lines
4.1 KiB
Python
import asyncio
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import os
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import threading
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from cista import config
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from cista.util import filename
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from cista.util.asynclink import AsyncLink
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from cista.util.lrucache import LRUCache
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def fuid(stat) -> str:
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"""Unique file ID. Stays the same on renames and modification."""
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return config.derived_secret("filekey-inode", stat.st_dev, stat.st_ino).hex()
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class File:
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def __init__(self, filename):
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self.path = config.config.path / filename
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self.fd = None
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self.writable = False
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def open_ro(self):
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self.close()
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self.fd = os.open(self.path, os.O_RDONLY)
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def open_rw(self):
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self.close()
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self.path.parent.mkdir(parents=True, exist_ok=True)
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self.fd = os.open(self.path, os.O_RDWR | os.O_CREAT)
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self.writable = True
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def write(self, pos, buffer, *, file_size=None):
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if not self.writable:
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# Create/open file
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self.open_rw()
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assert self.fd is not None
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if file_size is not None:
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assert pos + len(buffer) <= file_size
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os.ftruncate(self.fd, file_size)
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if buffer:
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os.lseek(self.fd, pos, os.SEEK_SET)
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os.write(self.fd, buffer)
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def __getitem__(self, slice):
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if self.fd is None:
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self.open_ro()
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assert self.fd is not None
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os.lseek(self.fd, slice.start, os.SEEK_SET)
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size = slice.stop - slice.start
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data = os.read(self.fd, size)
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if len(data) < size:
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raise EOFError("Error reading requested range")
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return data
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def close(self):
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if self.fd is not None:
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os.close(self.fd)
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self.fd = self.writable = None
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def __del__(self):
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self.close()
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class FileServer:
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async def start(self):
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self.alink = AsyncLink()
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self.worker = asyncio.get_event_loop().run_in_executor(
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None,
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self.worker_thread,
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self.alink.to_sync,
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)
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self.cache = LRUCache(File, capacity=10, maxage=5.0)
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self.cache_lock = threading.Lock()
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self.file_locks: dict[str, threading.Lock] = {}
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async def stop(self):
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await self.alink.stop()
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await self.worker
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def worker_thread(self, slink):
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try:
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for req in slink:
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with req as (command, *args):
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if command == "upload":
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req.set_result(self.upload(*args))
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elif command == "upload_info":
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req.set_result(self.upload_info(*args))
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elif command == "download":
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req.set_result(self.download(*args))
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else:
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raise NotImplementedError(f"Unhandled {command=} {args}")
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finally:
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self.cache.close()
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@staticmethod
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def _stat_size(path):
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try:
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return os.stat(path).st_size
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except FileNotFoundError:
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return None
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def upload(self, name, pos, data, file_size):
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name = filename.sanitize(name)
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with self.cache_lock:
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f = self.cache[name]
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lock = self.file_locks.setdefault(name, threading.Lock())
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with lock:
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f.write(pos, data, file_size=file_size)
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return len(data)
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def upload_info(self, name, pos, data, file_size):
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name = filename.sanitize(name)
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with self.cache_lock:
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f = self.cache[name]
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lock = self.file_locks.setdefault(name, threading.Lock())
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with lock:
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size_before = self._stat_size(f.path)
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f.write(pos, data, file_size=file_size)
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size_after = self._stat_size(f.path)
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return {
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"written": len(data),
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"created": size_before is None,
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"size_before": size_before,
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"size_after": size_after,
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}
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def download(self, name, start, end):
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name = filename.sanitize(name)
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with self.cache_lock:
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f = self.cache[name]
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lock = self.file_locks.setdefault(name, threading.Lock())
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with lock:
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return f[start:end]
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