Add pult frontend stuff

pult/backend/.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+

pult/backend/frontend

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+../frontend/build

pult/backend/main.py

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+import asyncio
+from typing import *
+
+from fastapi import FastAPI, WebSocket, WebSocketDisconnect, Request
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse
+
+from pydantic import BaseModel, Field, ValidationError
+
+
+app = FastAPI()
+
+
+class Slider:
+    def __init__(self):
+        self.value = 0
+        self.owner: Optional[WebSocket] = None
+        self.release_timer: Optional[asyncio.Task] = None
+        self.release_event = asyncio.Event()
+
+    def cancel_release_timer(self):
+        if self.release_timer is not None:
+            self.release_timer.cancel()
+            self.release_timer = None
+
+    def reset_release_timer(self):
+        self.cancel_release_timer()
+        self.release_timer = asyncio.create_task(self._release_timer())
+
+    async def _release_timer(self):
+        await asyncio.sleep(1)
+        self.release_event.set()
+
+
+dmx_state = [Slider() for _ in range(8)]
+
+
+class GrabAction(BaseModel):
+    action_type: Literal["grab"]
+    slider: int
+
+
+class ReleaseAction(BaseModel):
+    action_type: Literal["release"]
+    slider: int
+
+
+class MoveAction(BaseModel):
+    action_type: Literal["move"]
+    slider: int
+    new_value: int
+
+
+class ClientAction(BaseModel):
+    action: Union[GrabAction, ReleaseAction, MoveAction] = Field(
+        ..., discriminator="action_type"
+    )
+
+
+class SocketManager:
+    def __init__(self):
+        self.sockets = set()
+
+    async def on_connect(self, ws: WebSocket):
+        self.sockets.add(ws)
+        await self.push_state(ws)
+
+    def on_disconnect(self, ws: WebSocket):
+        self.sockets.remove(ws)
+
+        for slider in dmx_state:
+            if slider.owner == ws:
+                slider.owner = None
+
+    async def on_action(
+        self, ws: WebSocket, action: Union[GrabAction, ReleaseAction, MoveAction]
+    ):
+        slider = dmx_state[action.slider]
+
+        if action.action_type == "grab":
+            print(f"grab {action.slider}")
+
+            if slider.owner is None:
+                slider.owner = ws
+                slider.reset_release_timer()
+
+        elif action.action_type == "release":
+            print(f"release {action.slider}")
+
+            if slider.owner == ws:
+                slider.owner = None
+                slider.cancel_release_timer()
+                
+        elif action.action_type == "move":
+            print(f"move {action.slider} -> {action.new_value}")
+
+            if slider.owner == ws:
+                slider.value = action.new_value
+                slider.reset_release_timer()
+
+        await self.push_all()
+
+    async def push_state(self, ws: WebSocket):
+
+        response = []
+
+        for slider in dmx_state:
+            value = slider.value
+
+            if slider.owner == ws:
+                status = "owned"
+            elif slider.owner is not None:
+                status = "locked"
+            else:
+                status = "open"
+
+            response.append({"value": value, "status": status})
+
+        await ws.send_json(response)
+
+    async def push_all(self):
+        await asyncio.gather(*[self.push_state(ws) for ws in self.sockets])
+
+    async def watch_auto_release(self):
+        async def _watch(slider):
+            while True:
+                await slider.release_event.wait()
+                print("resetteroni")
+                slider.release_event.clear()
+                slider.owner = slider.release_timer = None
+                await self.push_all()
+
+        await asyncio.gather(*[_watch(slider) for slider in dmx_state])
+
+
+socket_manager = SocketManager()
+
+
+@app.websocket("/ws")
+async def ws_handler(ws: WebSocket):
+    await ws.accept()
+    await socket_manager.on_connect(ws)
+    try:
+        while True:
+            data = await ws.receive_json()
+            try:
+                action = ClientAction.parse_obj(data)
+                await socket_manager.on_action(ws, action.action)
+            except ValidationError as e:
+                print(e)
+    except WebSocketDisconnect as e:
+        pass
+    finally:
+        socket_manager.on_disconnect(ws)
+
+
+app.mount("/", StaticFiles(directory="frontend", html=True))
+
+
+@app.on_event("startup")
+async def on_startup():
+    asyncio.create_task(socket_manager.watch_auto_release())

pult/backend/requirements.txt

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+anyio==3.5.0
+asgiref==3.5.0
+click==8.0.3
+fastapi==0.73.0
+h11==0.13.0
+idna==3.3
+pydantic==1.9.0
+sniffio==1.2.0
+starlette==0.17.1
+typing-extensions==4.1.1
+uvicorn==0.17.5