add base files for web interface

tools/web_testbench/app.py

@@ -0,0 +1,55 @@
+from fastapi import FastAPI, WebSocket, Request
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import HTMLResponse
+
+import uvicorn
+import os
+from fastapi.templating import Jinja2Templates
+
+
+app = FastAPI()
+
+app.mount("/public", StaticFiles(
+    directory=os.path.join(os.path.dirname(__file__), "public")), name="public")
+
+templates = Jinja2Templates(
+    directory=os.path.join(os.path.dirname(__file__), "templates"))
+
+
+class ConnectionManager:
+    _instance = None
+
+    def __init__(self):
+        self.connections = []
+
+    def __new__(cls):
+        if not cls._instance:
+            cls._instance = super(
+                ConnectionManager,
+                cls
+            ).__new__(cls)
+        return cls._instance
+
+    async def connect(self, websocket: WebSocket):
+        await websocket.accept()
+        self.connections.append(websocket)
+
+    async def broadcast_json(self, data: str):
+        for connection in self.connections:
+            await connection.json(data)
+
+
+@app.websocket("/ws")
+async def ws(websocket: WebSocket):
+    await ConnectionManager().connect(websocket)
+
+
+@app.get("/")
+def dashboard(request: Request):
+    return templates.TemplateResponse("index.html", {
+        "request": request,
+    })
+
+
+if __name__ == '__main__':
+    uvicorn.run("app:app", host="0.0.0.0", port=80)