Formatting and fix Internal Server Error on upload

cista/__init__.py

@@ -1 +1,3 @@
 from cista._version import __version__
+
+__version__  # Public API

cista/__main__.py

@@ -34,6 +34,7 @@ User management:
   --password        Reset password
 """
 
+
 def main():
     # Dev mode doesn't catch exceptions
     if "--dev" in sys.argv:
@@ -45,6 +46,7 @@ def main():
         print("Error:", e)
         return 1
 
+
 def _main():
     args = docopt(doc)
     if args["--user"]:
@@ -64,19 +66,25 @@ def _main():
     if not necessary_opts:
         # Maybe run without arguments
         print(doc)
-        print("No config file found! Get started with:\n  cista -l :8000 /path/to/files, or\n  cista -l example.com --import-droppy  # Uses Droppy files\n")
+        print(
+            "No config file found! Get started with:\n  cista -l :8000 /path/to/files, or\n  cista -l example.com --import-droppy  # Uses Droppy files\n"
+        )
         return 1
     settings = {}
     if import_droppy:
         if exists:
-            raise ValueError(f"Importing Droppy: First remove the existing configuration:\n  rm {config.conffile}")
+            raise ValueError(
+                f"Importing Droppy: First remove the existing configuration:\n  rm {config.conffile}"
+            )
         settings = droppy.readconf()
-    if path: settings["path"] = path
+    if path:
-    if listen: settings["listen"] = listen
+        settings["path"] = path
+    if listen:
+        settings["listen"] = listen
     operation = config.update_config(settings)
     print(f"Config {operation}: {config.conffile}")
     # Prepare to serve
-    domain = unix = port = None
+    unix = None
     url, _ = serve.parse_listen(config.config.listen)
     if not config.config.path.is_dir():
         raise ValueError(f"No such directory: {config.config.path}")
@@ -88,6 +96,7 @@ def _main():
     # Run the server
     serve.run(dev=dev)
 
+
 def _confdir(args):
     if args["-c"]:
         # Custom config directory
@@ -99,6 +108,7 @@ def _confdir(args):
             confdir = confdir.parent
         config.conffile = config.conffile.with_parent(confdir)
 
+
 def _user(args):
     _confdir(args)
     config.load_config()
@@ -123,5 +133,6 @@ def _user(args):
     if res == "read":
         print("  No changes")
 
+
 if __name__ == "__main__":
     sys.exit(main())

cista/api.py

@@ -12,15 +12,18 @@ from cista.util.apphelpers import asend, websocket_wrapper
 bp = Blueprint("api", url_prefix="/api")
 fileserver = FileServer()
 
+
 @bp.before_server_start
 async def start_fileserver(app, _):
     await fileserver.start()
 
+
 @bp.after_server_stop
 async def stop_fileserver(app, _):
     await fileserver.stop()
 
-@bp.websocket('upload')
+
+@bp.websocket("upload")
 @websocket_wrapper
 async def upload(req, ws):
     alink = fileserver.alink
@@ -28,7 +31,9 @@ async def upload(req, ws):
         req = None
         text = await ws.recv()
         if not isinstance(text, str):
-            raise ValueError(f"Expected JSON control, got binary len(data) = {len(text)}")
+            raise ValueError(
+                f"Expected JSON control, got binary len(data) = {len(text)}"
+            )
         req = msgspec.json.decode(text, type=FileRange)
         pos = req.start
         data = None
@@ -43,7 +48,8 @@ async def upload(req, ws):
         await asend(ws, res)
         # await ws.drain()
 
-@bp.websocket('download')
+
+@bp.websocket("download")
 @websocket_wrapper
 async def download(req, ws):
     alink = fileserver.alink
@@ -51,7 +57,9 @@ async def download(req, ws):
         req = None
         text = await ws.recv()
         if not isinstance(text, str):
-            raise ValueError(f"Expected JSON control, got binary len(data) = {len(text)}")
+            raise ValueError(
+                f"Expected JSON control, got binary len(data) = {len(text)}"
+            )
         req = msgspec.json.decode(text, type=FileRange)
         pos = req.start
         while pos < req.end:
@@ -64,6 +72,7 @@ async def download(req, ws):
         await asend(ws, res)
         # await ws.drain()
 
+
 @bp.websocket("control")
 @websocket_wrapper
 async def control(req, ws):
@@ -71,6 +80,7 @@ async def control(req, ws):
     await asyncio.to_thread(cmd)
     await asend(ws, StatusMsg(status="ack", req=cmd))
 
+
 @bp.websocket("watch")
 @websocket_wrapper
 async def watch(req, ws):

cista/app.py

@@ -2,7 +2,6 @@ import mimetypes
 from importlib.resources import files
 from urllib.parse import unquote
 
-from html5tagger import E
 from sanic import Blueprint, Sanic, raw
 from sanic.exceptions import Forbidden, NotFound
 
@@ -16,15 +15,18 @@ app.blueprint(auth.bp)
 app.blueprint(bp)
 app.exception(Exception)(handle_sanic_exception)
 
+
 @app.before_server_start
 async def main_start(app, loop):
     config.load_config()
     await watching.start(app, loop)
 
+
 @app.after_server_stop
 async def main_stop(app, loop):
     await watching.stop(app, loop)
 
+
 @app.on_request
 async def use_session(req):
     req.ctx.session = session.get(req)
@@ -41,13 +43,21 @@ async def use_session(req):
     if origin and origin.split("//", 1)[1] != req.host:
         raise Forbidden("Invalid origin: Cross-Site requests not permitted")
 
+
 @app.before_server_start
 def http_fileserver(app, _):
     bp = Blueprint("fileserver")
     bp.on_request(auth.verify)
-    bp.static("/files/", config.config.path, use_content_range=True, stream_large_files=True, directory_view=True)
+    bp.static(
+        "/files/",
+        config.config.path,
+        use_content_range=True,
+        stream_large_files=True,
+        directory_view=True,
+    )
     app.blueprint(bp)
 
+
 @app.get("/<path:path>", static=True)
 async def wwwroot(req, path=""):
     """Frontend files only"""
@@ -55,6 +65,8 @@ async def wwwroot(req, path=""):
     try:
         index = files("cista").joinpath("wwwroot", name).read_bytes()
     except OSError as e:
-        raise NotFound(f"File not found: /{path}", extra={"name": name, "exception": repr(e)})
+        raise NotFound(
+            f"File not found: /{path}", extra={"name": name, "exception": repr(e)}
+        )
     mime = mimetypes.guess_type(name)[0] or "application/octet-stream"
     return raw(index, content_type=mime)

cista/auth.py

@@ -12,10 +12,12 @@ from sanic.exceptions import BadRequest, Forbidden, Unauthorized
 from cista import config, session
 
 _argon = argon2.PasswordHasher()
-_droppyhash = re.compile(r'^([a-f0-9]{64})\$([a-f0-9]{8})$')
+_droppyhash = re.compile(r"^([a-f0-9]{64})\$([a-f0-9]{8})$")
+
 
 def _pwnorm(password):
-    return normalize('NFC', password).strip().encode()
+    return normalize("NFC", password).strip().encode()
+
 
 def login(username: str, password: str):
     un = _pwnorm(username)
@@ -49,33 +51,51 @@ def login(username: str, password: str):
     u.lastSeen = now
     return u
 
+
 def set_password(user: config.User, password: str):
     user.hash = _argon.hash(_pwnorm(password))
 
+
 class LoginResponse(msgspec.Struct):
     user: str = ""
     privileged: bool = False
     error: str = ""
 
+
 def verify(request, privileged=False):
     """Raise Unauthorized or Forbidden if the request is not authorized"""
     if privileged:
         if request.ctx.user:
-            if request.ctx.user.privileged: return
+            if request.ctx.user.privileged:
+                return
             raise Forbidden("Access Forbidden: Only for privileged users")
-    elif config.config.public or request.ctx.user: return
+    elif config.config.public or request.ctx.user:
+        return
     raise Unauthorized("Login required", "cookie", context={"redirect": "/login"})
 
+
 bp = Blueprint("auth")
 
+
 @bp.get("/login")
 async def login_page(request):
     doc = Document("Cista Login")
     with doc.div(id="login"):
         with doc.form(method="POST", autocomplete="on"):
             doc.h1("Login")
-            doc.input(name="username", placeholder="Username", autocomplete="username", required=True).br
+            doc.input(
-            doc.input(type="password", name="password", placeholder="Password", autocomplete="current-password", required=True).br
+                name="username",
+                placeholder="Username",
+                autocomplete="username",
+                required=True,
+            ).br
+            doc.input(
+                type="password",
+                name="password",
+                placeholder="Password",
+                autocomplete="current-password",
+                required=True,
+            ).br
             doc.input(type="submit", value="Login")
         s = session.get(request)
         if s:
@@ -84,7 +104,12 @@ async def login_page(request):
                 doc.input(type="submit", value=f"Logout {name}")
     flash = request.cookies.message
     if flash:
-        doc.dialog(flash, id="flash", open=True, style="position: fixed; top: 0; left: 0; width: 100%; opacity: .8")
+        doc.dialog(
+            flash,
+            id="flash",
+            open=True,
+            style="position: fixed; top: 0; left: 0; width: 100%; opacity: .8",
+        )
     res = html(doc)
     if flash:
         res.cookies.delete_cookie("flash")
@@ -92,6 +117,7 @@ async def login_page(request):
         session.delete(res)
     return res
 
+
 @bp.post("/login")
 async def login_post(request):
     try:
@@ -118,6 +144,7 @@ async def login_post(request):
     session.create(res, username)
     return res
 
+
 @bp.post("/logout")
 async def logout_post(request):
     s = request.ctx.session

cista/config.py

@@ -17,26 +17,28 @@ class Config(msgspec.Struct):
     users: dict[str, User] = {}
     links: dict[str, Link] = {}
 
+
 class User(msgspec.Struct, omit_defaults=True):
     privileged: bool = False
     hash: str = ""
     lastSeen: int = 0
 
+
 class Link(msgspec.Struct, omit_defaults=True):
     location: str
     creator: str = ""
     expires: int = 0
 
+
 config = None
 conffile = Path.home() / ".local/share/cista/db.toml"
 
+
 def derived_secret(*params, len=8) -> bytes:
     """Used to derive secret keys from the main secret"""
     # Each part is made the same length by hashing first
     combined = b"".join(
-        sha256(
+        sha256(p if isinstance(p, bytes) else f"{p}".encode()).digest()
-            p if isinstance(p, bytes) else f"{p}".encode()
-        ).digest()
         for p in [config.secret, *params]
     )
     # Output a bytes of the desired length
@@ -48,11 +50,13 @@ def enc_hook(obj):
         return obj.as_posix()
     raise TypeError
 
+
 def dec_hook(typ, obj):
     if typ is Path:
         return Path(obj)
     raise TypeError
 
+
 def config_update(modify):
     global config
     if not conffile.exists():
@@ -93,21 +97,28 @@ def config_update(modify):
     config = c
     return "modified" if old else "created"
 
+
 def modifies_config(modify):
     """Decorator for functions that modify the config file"""
+
     @wraps(modify)
     def wrapper(*args, **kwargs):
-        m = lambda c: modify(c, *args, **kwargs)
+        def m(c):
+            return modify(c, *args, **kwargs)
+
         # Retry modification in case of write collision
         while (c := config_update(m)) == "collision":
             time.sleep(0.01)
         return c
+
     return wrapper
 
+
 def load_config():
     global config
     config = msgspec.toml.decode(conffile.read_bytes(), type=Config, dec_hook=dec_hook)
 
+
 @modifies_config
 def update_config(conf: Config, changes: dict) -> Config:
     """Create/update the config with new values, respecting changes done by others."""
@@ -116,6 +127,7 @@ def update_config(conf: Config, changes: dict) -> Config:
     settings.update(changes)
     return msgspec.convert(settings, Config, dec_hook=dec_hook)
 
+
 @modifies_config
 def update_user(conf: Config, name: str, changes: dict) -> Config:
     """Create/update a user with new values, respecting changes done by others."""
@@ -126,6 +138,7 @@ def update_user(conf: Config, name: str, changes: dict) -> Config:
         u = User()
     if "password" in changes:
         from . import auth
+
         auth.set_password(u, changes["password"])
         del changes["password"]
     udict = msgspec.to_builtins(u, enc_hook=enc_hook)
@@ -134,6 +147,7 @@ def update_user(conf: Config, name: str, changes: dict) -> Config:
     settings["users"][name] = msgspec.convert(udict, User, dec_hook=dec_hook)
     return msgspec.convert(settings, Config, dec_hook=dec_hook)
 
+
 @modifies_config
 def del_user(conf: Config, name: str) -> Config:
     """Delete named user account."""

cista/droppy.py

@@ -11,6 +11,7 @@ def readconf() -> dict:
     cf["listen"] = _droppy_listeners(cf)
     return cf | db
 
+
 def _droppy_listeners(cf):
     """Convert Droppy listeners to our format, for typical cases but not in full."""
     for listener in cf["listeners"]:
@@ -20,15 +21,19 @@ def _droppy_listeners(cf):
                 continue
             socket = listener.get("socket")
             if socket:
-                if isinstance(socket, list): socket = socket[0]
+                if isinstance(socket, list):
+                    socket = socket[0]
                 return f"{socket}"
             port = listener["port"]
-            if isinstance(port, list): port = port[0]
+            if isinstance(port, list):
+                port = port[0]
             host = listener["host"]
-            if isinstance(host, list): host = host[0]
+            if isinstance(host, list):
-            if host in ("127.0.0.1", "::", "localhost"): return f":{port}"
+                host = host[0]
+            if host in ("127.0.0.1", "::", "localhost"):
+                return f":{port}"
             return f"{host}:{port}"
         except (KeyError, IndexError):
             continue
     # If none matched, fallback to Droppy default
-    return f"0.0.0.0:8989"
+    return "0.0.0.0:8989"

cista/fileio.py

@@ -1,7 +1,5 @@
 import asyncio
 import os
-import unicodedata
-from pathlib import PurePosixPath
 
 from cista import config
 from cista.util import filename
@@ -13,6 +11,7 @@ def fuid(stat) -> str:
     """Unique file ID. Stays the same on renames and modification."""
     return config.derived_secret("filekey-inode", stat.st_dev, stat.st_ino).hex()
 
+
 class File:
     def __init__(self, filename):
         self.path = config.config.path / filename
@@ -30,23 +29,24 @@ class File:
         self.writable = True
 
     def write(self, pos, buffer, *, file_size=None):
-        assert self.fd is not None
         if not self.writable:
             # Create/open file
             self.open_rw()
+        assert self.fd is not None
         if file_size is not None:
             os.ftruncate(self.fd, file_size)
         os.lseek(self.fd, pos, os.SEEK_SET)
         os.write(self.fd, buffer)
 
     def __getitem__(self, slice):
-        assert self.fd is not None
         if self.fd is None:
             self.open_ro()
+        assert self.fd is not None
         os.lseek(self.fd, slice.start, os.SEEK_SET)
-        l = slice.stop - slice.start
+        size = slice.stop - slice.start
-        data = os.read(self.fd, l)
+        data = os.read(self.fd, size)
-        if len(data) < l: raise EOFError("Error reading requested range")
+        if len(data) < size:
+            raise EOFError("Error reading requested range")
         return data
 
     def close(self):
@@ -59,10 +59,11 @@ class File:
 
 
 class FileServer:
-
     async def start(self):
         self.alink = AsyncLink()
-        self.worker = asyncio.get_event_loop().run_in_executor(None, self.worker_thread, self.alink.to_sync)
+        self.worker = asyncio.get_event_loop().run_in_executor(
+            None, self.worker_thread, self.alink.to_sync
+        )
         self.cache = LRUCache(File, capacity=10, maxage=5.0)
 
     async def stop(self):

cista/serve.py

@@ -10,6 +10,7 @@ from cista import config, server80
 def run(dev=False):
     """Run Sanic main process that spawns worker processes to serve HTTP requests."""
     from .app import app
+
     url, opts = parse_listen(config.config.listen)
     # Silence Sanic's warning about running in production rather than debug
     os.environ["SANIC_IGNORE_PRODUCTION_WARNING"] = "1"
@@ -21,20 +22,33 @@ def run(dev=False):
         domain = opts["host"]
         check_cert(confdir / domain, domain)
         opts["ssl"] = str(confdir / domain)  # type: ignore
-    app.prepare(**opts, motd=False, dev=dev, auto_reload=dev, reload_dir={confdir, wwwroot}, access_log=True)  # type: ignore
+    app.prepare(
+        **opts,
+        motd=False,
+        dev=dev,
+        auto_reload=dev,
+        reload_dir={confdir, wwwroot},
+        access_log=True,
+    )  # type: ignore
     Sanic.serve()
 
+
 def check_cert(certdir, domain):
     if (certdir / "privkey.pem").exist() and (certdir / "fullchain.pem").exists():
         return
     # TODO: Use certbot to fetch a cert
-    raise ValueError(f"TLS certificate files privkey.pem and fullchain.pem needed in {certdir}")
+    raise ValueError(
+        f"TLS certificate files privkey.pem and fullchain.pem needed in {certdir}"
+    )
+
 
 def parse_listen(listen):
     if listen.startswith("/"):
         unix = Path(listen).resolve()
         if not unix.parent.exists():
-            raise ValueError(f"Directory for unix socket does not exist: {unix.parent}/")
+            raise ValueError(
+                f"Directory for unix socket does not exist: {unix.parent}/"
+            )
         return "http://localhost", {"unix": unix}
     elif re.fullmatch(r"(\w+(-\w+)*\.)+\w{2,}", listen, re.UNICODE):
         return f"https://{listen}", {"host": listen, "port": 443, "ssl": True}

cista/server80.py

@@ -2,6 +2,7 @@ from sanic import Sanic, exceptions, response
 
 app = Sanic("server80")
 
+
 # Send all HTTP users to HTTPS
 @app.exception(exceptions.NotFound, exceptions.MethodNotSupported)
 def redirect_everything_else(request, exception):
@@ -10,6 +11,7 @@ def redirect_everything_else(request, exception):
         return response.redirect(f"https://{server}{path}", status=308)
     return response.text("Bad Request. Please use HTTPS!", status=400)
 
+
 # ACME challenge for LetsEncrypt
 @app.get("/.well-known/acme-challenge/<challenge>")
 async def letsencrypt(request, challenge):
@@ -18,4 +20,5 @@ async def letsencrypt(request, challenge):
     except KeyError:
         return response.text(f"ACME challenge not found: {challenge}", status=404)
 
+
 acme_challenges = {}

cista/session.py

@@ -4,16 +4,21 @@ import jwt
 
 from cista.config import derived_secret
 
-session_secret = lambda: derived_secret("session")
+
+def session_secret():
+    return derived_secret("session")
+
+
 max_age = 365 * 86400  # Seconds since last login
 
+
 def get(request):
     try:
         return jwt.decode(request.cookies.s, session_secret(), algorithms=["HS256"])
-    except Exception as e:
+    except Exception:
-        s = None
         return False if "s" in request.cookies else None
 
+
 def create(res, username, **kwargs):
     data = {
         "exp": int(time()) + max_age,
@@ -23,12 +28,14 @@ def create(res, username, **kwargs):
     s = jwt.encode(data, session_secret())
     res.cookies.add_cookie("s", s, httponly=True, max_age=max_age)
 
+
 def update(res, s, **kwargs):
     s.update(kwargs)
     s = jwt.encode(s, session_secret())
     max_age = max(1, s["exp"] - int(time()))  # type: ignore
     res.cookies.add_cookie("s", s, httponly=True, max_age=max_age)
 
+
 def delete(res):
     res.cookies.delete_cookie("s")
 

cista/util/apphelpers.py

@@ -14,10 +14,12 @@ def asend(ws, msg):
     """Send JSON message or bytes to a websocket"""
     return ws.send(msg if isinstance(msg, bytes) else msgspec.json.encode(msg).decode())
 
+
 def jres(data, **kwargs):
     """JSON Sanic response, using msgspec encoding"""
     return raw(msgspec.json.encode(data), content_type="application/json", **kwargs)
 
+
 async def handle_sanic_exception(request, e):
     logger.exception(e)
     context, code = {}, 500
@@ -30,7 +32,9 @@ async def handle_sanic_exception(request, e):
     message = f"⚠️ {message}" if code < 500 else f"🛑 {message}"
     # Non-browsers get JSON errors
     if "text/html" not in request.headers.accept:
-        return jres(ErrorMsg({"code": code, "message": message, **context}), status=code)
+        return jres(
+            ErrorMsg({"code": code, "message": message, **context}), status=code
+        )
     # Redirections flash the error message via cookies
     if "redirect" in context:
         res = redirect(context["redirect"])
@@ -39,8 +43,10 @@ async def handle_sanic_exception(request, e):
     # Otherwise use Sanic's default error page
     return errorpages.HTMLRenderer(request, e, debug=request.app.debug).full()
 
+
 def websocket_wrapper(handler):
     """Decorator for websocket handlers that catches exceptions and sends them back to the client"""
+
     @wraps(handler)
     async def wrapper(request, ws, *args, **kwargs):
         try:
@@ -55,4 +61,5 @@ def websocket_wrapper(handler):
             message = f"⚠️ {message}" if code < 500 else f"🛑 {message}"
             await asend(ws, ErrorMsg({"code": code, "message": message, **context}))
             raise
+
     return wrapper

cista/util/lrucache.py

@@ -11,6 +11,7 @@ class LRUCache:
         maxage (float): Max age for items in cache in seconds.
         cache (list): Internal list storing the cache items.
     """
+
     def __init__(self, open: callable, *, capacity: int, maxage: float):
         """
         Initialize LRUCache.

cista/util/pwgen.py

@@ -6,6 +6,7 @@ def generate(n=4):
     wl = list(words)
     return ".".join(wl.pop(secrets.randbelow(len(wl))) for i in range(n))
 
+
 # A custom list of 1024 common 3-6 letter words, with unique 3-prefixes and no prefix words, entropy 2.1b/letter 10b/word
 words: list = """
 able about absent abuse access acid across act adapt add adjust admit adult advice affair afraid again age agree ahead

tests/test_control.py

@@ -13,11 +13,13 @@ def setup_temp_dir():
         config.config = config.Config(path=Path(tmpdirname), listen=":0")
         yield Path(tmpdirname)
 
+
 def test_mkdir(setup_temp_dir):
     cmd = MkDir(path="new_folder")
     cmd()
     assert (setup_temp_dir / "new_folder").is_dir()
 
+
 def test_rename(setup_temp_dir):
     (setup_temp_dir / "old_name").mkdir()
     cmd = Rename(path="old_name", to="new_name")
@@ -25,12 +27,14 @@ def test_rename(setup_temp_dir):
     assert not (setup_temp_dir / "old_name").exists()
     assert (setup_temp_dir / "new_name").is_dir()
 
+
 def test_rm(setup_temp_dir):
     (setup_temp_dir / "folder_to_remove").mkdir()
     cmd = Rm(sel=["folder_to_remove"])
     cmd()
     assert not (setup_temp_dir / "folder_to_remove").exists()
 
+
 def test_mv(setup_temp_dir):
     (setup_temp_dir / "folder_to_move").mkdir()
     (setup_temp_dir / "destination").mkdir()
@@ -39,6 +43,7 @@ def test_mv(setup_temp_dir):
     assert not (setup_temp_dir / "folder_to_move").exists()
     assert (setup_temp_dir / "destination" / "folder_to_move").is_dir()
 
+
 def test_cp(setup_temp_dir):
     (setup_temp_dir / "folder_to_copy").mkdir()
     (setup_temp_dir / "destination").mkdir()

tests/test_lrucache.py

@@ -1,8 +1,6 @@
 from time import sleep
 from unittest.mock import Mock
 
-import pytest
-
 from cista.util.lrucache import LRUCache  # Replace with actual import
 
 
@@ -12,24 +10,28 @@ def mock_open(key):
     mock.content = f"content-{key}"
     return mock
 
+
 def test_contains():
     cache = LRUCache(open=mock_open, capacity=2, maxage=10)
     assert "key1" not in cache
     cache["key1"]
     assert "key1" in cache
 
+
 def test_getitem():
     cache = LRUCache(open=mock_open, capacity=2, maxage=10)
     assert cache["key1"].content == "content-key1"
 
+
 def test_capacity():
     cache = LRUCache(open=mock_open, capacity=2, maxage=10)
     item1 = cache["key1"]
-    item2 = cache["key2"]
+    cache["key2"]
     cache["key3"]
     assert "key1" not in cache
     item1.close.assert_called()
 
+
 def test_expiry():
     cache = LRUCache(open=mock_open, capacity=2, maxage=0.1)
     item = cache["key1"]
@@ -38,6 +40,7 @@ def test_expiry():
     assert "key1" not in cache
     item.close.assert_called()
 
+
 def test_close():
     cache = LRUCache(open=mock_open, capacity=2, maxage=10)
     item = cache["key1"]
@@ -45,6 +48,7 @@ def test_close():
     assert "key1" not in cache
     item.close.assert_called()
 
+
 def test_lru_mechanism():
     cache = LRUCache(open=mock_open, capacity=2, maxage=10)
     item1 = cache["key1"]