fix: replace datetime.UTC with timezone.utc for Python 3.12+ compatibility

dev/gpu/gpu_miner_host.py

@@ -10,7 +10,7 @@ import logging
 import sys
 import subprocess
 import os
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 from typing import Dict, Optional
 
 # Configuration
@@ -211,7 +211,7 @@ def send_heartbeat():
         heartbeat_data = {
             "status": "active",
             "current_jobs": 0,
-            "last_seen": datetime.now(datetime.UTC).isoformat(),
+            "last_seen": datetime.now(timezone.utc).isoformat(),
             "gpu_utilization": gpu_info["utilization"],
             "memory_used": gpu_info["memory_used"],
             "memory_total": gpu_info["memory_total"],
@@ -223,7 +223,7 @@ def send_heartbeat():
         heartbeat_data = {
             "status": "active",
             "current_jobs": 0,
-            "last_seen": datetime.now(datetime.UTC).isoformat(),
+            "last_seen": datetime.now(timezone.utc).isoformat(),
             "gpu_utilization": 0,
             "memory_used": 0,
             "memory_total": 0,

dev/gpu/gpu_registry_demo.py

@@ -7,7 +7,7 @@ from fastapi import FastAPI, HTTPException
 from pydantic import BaseModel
 from typing import Dict, Any, Optional
 import uvicorn
-from datetime import datetime, UTC
+from datetime import datetime, timezone
 
 app = FastAPI(title="GPU Registry Demo")
 
@@ -37,8 +37,8 @@ async def register_gpu(miner_id: str, gpu_data: GPURegistration):
     """Register a GPU miner"""
     registered_gpus[miner_id] = {
         "id": miner_id,
-        "registered_at": datetime.now(datetime.UTC).isoformat(),
-        "last_heartbeat": datetime.now(datetime.UTC).isoformat(),
+        "registered_at": datetime.now(timezone.utc).isoformat(),
+        "last_heartbeat": datetime.now(timezone.utc).isoformat(),
         **gpu_data.dict()
     }
     return {"status": "ok", "message": f"GPU {miner_id} registered successfully"}
@@ -49,7 +49,7 @@ async def heartbeat(miner_id: str, heartbeat_data: Heartbeat):
     if miner_id not in registered_gpus:
         raise HTTPException(status_code=404, detail="GPU not registered")
     
-    registered_gpus[miner_id]["last_heartbeat"] = datetime.now(datetime.UTC).isoformat()
+    registered_gpus[miner_id]["last_heartbeat"] = datetime.now(timezone.utc).isoformat()
     registered_gpus[miner_id]["status"] = heartbeat_data.status
     registered_gpus[miner_id]["metadata"] = heartbeat_data.metadata