Improve data read (#362)

* Improve data read

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

plugins/terminals/fps_terminals/win_server.py

@@ -1,6 +1,8 @@
 import asyncio
 import os
+from functools import partial
 
+from anyio import to_thread
 from winpty import PTY  # type: ignore
 
 from jupyverse_api.terminals import TerminalServer
@@ -32,12 +34,10 @@ async def serve(self, websocket):
     async def send_data(self):
         while True:
             try:
-                data = self.process.read(blocking=False)
+                data = await to_thread.run_sync(partial(self.process.read, blocking=True))
             except Exception:
                 await self.websocket.send_json(["disconnect", 1])
                 return
-            if not data:
-                await asyncio.sleep(0.1)
             else:
                 for websocket in self.websockets:
                     await websocket.send_json(["stdout", data])

plugins/terminals/pyproject.toml

@@ -11,6 +11,7 @@ dependencies = [
     "websockets",
     "pywinpty;platform_system=='Windows'",
     "jupyverse-api >=0.1.2,<1",
+    "anyio >=4,<5",
 ]
 dynamic = ["version"]
 [[project.authors]]