84 lines
2.4 KiB
Python
84 lines
2.4 KiB
Python
import asyncio
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import os
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from asynclink import AsyncLink
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from lrucache import LRUCache
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class File:
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def __init__(self, filename):
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self.filename = 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.filename, os.O_RDONLY)
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def open_rw(self):
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self.close()
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self.fd = os.open(self.filename, 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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self.open_rw()
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if file_size is not None:
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os.ftruncate(self.fd, file_size)
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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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os.lseek(self.fd, slice.start, os.SEEK_SET)
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l = slice.stop - slice.start
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data = os.read(self.fd, l)
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if len(data) < l: 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(None, self.worker_thread, alink.to_sync)
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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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cache = LRUCache(File, capacity=10, maxage=5.0)
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for req in slink:
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with req as (command, msg, data):
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if command == "upload":
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req.set_result(self.upload(msg, data))
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else:
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raise NotImplementedError(f"Unhandled {command=} {msg}")
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def upload(self, msg, data):
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name = str(msg['name'])
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size = int(msg['size'])
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start = int(msg['start'])
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end = int(msg['end'])
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if not 0 <= start < end <= size:
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raise OverflowError("Invalid range")
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if end - start > 1<<20:
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raise OverflowError("Too much data, max 1 MiB.")
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if end - start != len(data):
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raise ValueError("Data length does not match range")
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f = self.cache[name]
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f.write(start, data, file_size=size)
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return {"written": len(data), **msg}
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