examples(foundational): support multiple transports

examples/foundational/04-transports-small-webrtc.py

@@ -5,10 +5,17 @@
 #
 
 import argparse
+import asyncio
 import os
+from contextlib import asynccontextmanager
+from typing import Dict
 
+import uvicorn
 from dotenv import load_dotenv
+from fastapi import BackgroundTasks, FastAPI
+from fastapi.responses import RedirectResponse
 from loguru import logger
+from pipecat_ai_small_webrtc_prebuilt.frontend import SmallWebRTCPrebuiltUI
 
 from pipecat.audio.vad.silero import SileroVADAnalyzer
 from pipecat.pipeline.pipeline import Pipeline
@@ -20,14 +27,29 @@ from pipecat.services.deepgram.stt import DeepgramSTTService
 from pipecat.services.openai.llm import OpenAILLMService
 from pipecat.transports.base_transport import TransportParams
 from pipecat.transports.network.small_webrtc import SmallWebRTCTransport
-from pipecat.transports.network.webrtc_connection import SmallWebRTCConnection
+from pipecat.transports.network.webrtc_connection import IceServer, SmallWebRTCConnection
 
 load_dotenv(override=True)
 
+app = FastAPI()
 
-async def run_bot(webrtc_connection: SmallWebRTCConnection, _: argparse.Namespace):
+# Store connections by pc_id
+pcs_map: Dict[str, SmallWebRTCConnection] = {}
+
+ice_servers = [
+    IceServer(
+        urls="stun:stun.l.google.com:19302",
+    )
+]
+
+# Mount the frontend at /
+app.mount("/client", SmallWebRTCPrebuiltUI)
+
+
+async def run_example(webrtc_connection: SmallWebRTCConnection):
     logger.info(f"Starting bot")
 
+    # Create a transport using the WebRTC connection
     transport = SmallWebRTCTransport(
         webrtc_connection=webrtc_connection,
         params=TransportParams(
@@ -88,6 +110,7 @@ async def run_bot(webrtc_connection: SmallWebRTCConnection, _: argparse.Namespac
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info(f"Client disconnected")
+        await task.cancel()
 
     @transport.event_handler("on_client_closed")
     async def on_client_closed(transport, client):
@@ -99,7 +122,58 @@ async def run_bot(webrtc_connection: SmallWebRTCConnection, _: argparse.Namespac
     await runner.run(task)
 
 
-if __name__ == "__main__":
-    from run import main
+@app.get("/", include_in_schema=False)
+async def root_redirect():
+    return RedirectResponse(url="/client/")
 
-    main()
+
+@app.post("/api/offer")
+async def offer(request: dict, background_tasks: BackgroundTasks):
+    pc_id = request.get("pc_id")
+
+    if pc_id and pc_id in pcs_map:
+        pipecat_connection = pcs_map[pc_id]
+        logger.info(f"Reusing existing connection for pc_id: {pc_id}")
+        await pipecat_connection.renegotiate(
+            sdp=request["sdp"],
+            type=request["type"],
+            restart_pc=request.get("restart_pc", False),
+        )
+    else:
+        pipecat_connection = SmallWebRTCConnection(ice_servers)
+        await pipecat_connection.initialize(sdp=request["sdp"], type=request["type"])
+
+        @pipecat_connection.event_handler("closed")
+        async def handle_disconnected(webrtc_connection: SmallWebRTCConnection):
+            logger.info(f"Discarding peer connection for pc_id: {webrtc_connection.pc_id}")
+            pcs_map.pop(webrtc_connection.pc_id, None)
+
+        # Run example function with SmallWebRTC transport arguments.
+        background_tasks.add_task(run_example, pipecat_connection)
+
+    answer = pipecat_connection.get_answer()
+    # Updating the peer connection inside the map
+    pcs_map[answer["pc_id"]] = pipecat_connection
+
+    return answer
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    yield  # Run app
+    coros = [pc.close() for pc in pcs_map.values()]
+    await asyncio.gather(*coros)
+    pcs_map.clear()
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Pipecat Bot Runner")
+    parser.add_argument(
+        "--host", default="localhost", help="Host for HTTP server (default: localhost)"
+    )
+    parser.add_argument(
+        "--port", type=int, default=7860, help="Port for HTTP server (default: 7860)"
+    )
+    args = parser.parse_args()
+
+    uvicorn.run(app, host=args.host, port=args.port)