feat: started ping router and internal messaging for pings

ref: N25B-151

src/control_backend/agents/ri_communication_agent.py

@@ -5,11 +5,13 @@ from spade.agent import Agent
 from spade.behaviour import CyclicBehaviour
 import zmq
 
+
 from control_backend.core.config import settings
 from control_backend.core.zmq_context import context
-from control_backend.schemas.message import Message
+from control_backend.schemas.ri_message import RIMessage
 from control_backend.agents.ri_command_agent import RICommandAgent
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -63,6 +65,11 @@ class RICommunicationAgent(Agent):
                 logger.info(f"No ping back retrieved in {seconds_to_wait_total/2} seconds totalling {seconds_to_wait_total} of time, killing myself.")
                 self.agent.connected = False
                 # TODO: Send event to UI letting know that we've lost connection
+                topic = b"ping"
+                data = json.dumps(False).encode()
+                pub_socket = context.socket(zmq.PUB)
+                pub_socket.connect(settings.zmq_settings.internal_comm_address)
+                pub_socket.send_multipart([topic, data])
 
                 self.kill()
 
@@ -90,6 +97,7 @@ class RICommunicationAgent(Agent):
         logger.info("Setting up %s", self.jid)
         retries = 0
 
+
         # Let's try a certain amount of times before failing connection
         while retries < max_retries:
             # Bind request socket

src/control_backend/api/v1/endpoints/command.py

@@ -1,21 +0,0 @@
-from fastapi import APIRouter, Request
-import logging
-
-from zmq import Socket
-
-from control_backend.schemas.ri_message import SpeechCommand, RIEndpoint
-
-logger = logging.getLogger(__name__)
-
-router = APIRouter()
-
-
-@router.post("/command", status_code=202)
-async def receive_command(command: SpeechCommand, request: Request):
-    # Validate and retrieve data.
-    SpeechCommand.model_validate(command)
-    topic = b"command"
-    pub_socket: Socket = request.app.state.internal_comm_socket
-    pub_socket.send_multipart([topic, command.model_dump_json().encode()])
-
-    return {"status": "Command received"}

src/control_backend/api/v1/endpoints/robot.py

@@ -0,0 +1,74 @@
+from fastapi import APIRouter, Request
+from fastapi.responses import JSONResponse, StreamingResponse
+import logging
+import asyncio
+import zmq.asyncio
+import json
+import datetime
+
+from zmq import Socket
+from control_backend.core.zmq_context import context
+from control_backend.core.config import settings
+from control_backend.schemas.ri_message import SpeechCommand, RIEndpoint
+
+
+
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+@router.post("/command", status_code=202)
+async def receive_command(command: SpeechCommand, request: Request):
+    # Validate and retrieve data.
+    SpeechCommand.model_validate(command)
+    topic = b"command"
+    pub_socket: Socket = request.app.state.internal_comm_socket
+    pub_socket.send_multipart([topic, command.model_dump_json().encode()])
+
+    return {"status": "Command received"}
+
+
+@router.get("/ping_check")
+async def ping(request: Request):
+    pass
+
+
+@router.get("/ping_stream")
+async def ping_stream(request: Request):
+    """Stream live updates whenever the device state changes."""
+    async def event_stream():
+        # Set up internal socket to receive ping updates
+        logger.debug("Ping stream router event stream entered.")
+        sub_socket = zmq.asyncio.Context().socket(zmq.SUB)
+        sub_socket.connect(settings.zmq_settings.internal_comm_address)
+        sub_socket.setsockopt(zmq.SUBSCRIBE, b"ping")
+        connected = True
+
+        ping_frequency = 1 # How many seconds between ping attempts
+
+        # Even though its most likely the updates should alternate
+        # So, True - False - True - False for connectivity.
+        # Let's still check:)
+        while True:
+            logger.debug("Ping stream entered listening ")
+            try:
+                topic, body = await asyncio.wait_for(sub_socket.recv_multipart(), timeout=ping_frequency)
+                logger.debug("got ping change in ping_stream router")
+                connected = json.loads(body)
+            except TimeoutError as e:
+                await asyncio.sleep(0.1)
+                
+            # Stop if client disconnected
+            if await request.is_disconnected():
+                print("Client disconnected from SSE")
+                break
+
+
+            logger.debug(f"Yielded new connection event in robot ping router: {str(connected)}")
+            yield f"data: {str(connected)}, time:{str(datetime.datetime.now().strftime("%H:%M:%S"))}\n\n"
+
+            
+
+    return StreamingResponse(event_stream(), media_type="text/event-stream")

src/control_backend/api/v1/router.py

@@ -1,6 +1,6 @@
 from fastapi.routing import APIRouter
 
-from control_backend.api.v1.endpoints import message, sse, command
+from control_backend.api.v1.endpoints import message, sse, robot
 
 api_router = APIRouter()
 
@@ -8,4 +8,4 @@ api_router.include_router(message.router, tags=["Messages"])
 
 api_router.include_router(sse.router, tags=["SSE"])
 
-api_router.include_router(command.router, tags=["Commands"])
+api_router.include_router(robot.router, prefix="/robot", tags=["Pings", "Commands"])