vastai-webhooks-events

# Vast.ai Webhooks & Events ## Overview Build event-driven workflows around Vast.ai GPU instance lifecycle. Vast.ai does not provide traditional webhooks, so event detection relies on polling the REST API at `cloud.vast.ai/api/v0` and reacting to instance status transitions (loading, running, exited, error, offline). ## Prerequisites - Vast.ai CLI authenticated - Understanding of instance lifecycle states - Python 3.8+ for event loop implementation ## Instructions ### Step 1: Instance Status Poller ```python import time, json, subprocess from typing import Callable, Dict, List class InstanceEventPoller: """Poll Vast.ai API and emit events on status transitions.""" def __init__(self, api_key: str, poll_interval: int = 30): self.api_key = api_key self.poll_interval = poll_interval self.previous_states: Dict[int, str] = {} self.handlers: Dict[str, List[Callable]] = {} def on(self, event: str, handler: Callable): self.handlers.setdefault(event, []).append(handler) def poll_once(self): result = subprocess.run( ["vastai", "show", "instances", "--raw"], capture_output=True, text=True) instances = json.loads(result.stdout) for inst in instances: inst_id = inst["id"] status = inst.get("actual_status", "unknown") prev = self.previous_states.get(inst_id) if prev and prev != status: event = f"{prev}_to_{status}"...