Add core service infrastructure
- NATS event bus (pub/sub, JetStream, KV storage) - Service registry with health monitoring - Base service class with lifecycle management - Config system - Logger with Vi formatting Adapted from Lyra's patterns, namespace changed to vi.* 🦊💕
This commit is contained in:
Alex Kazaiev
31
core/__init__.py
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31
core/__init__.py
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@@ -0,0 +1,31 @@
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# Vi Core Module
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# Nervous system infrastructure for Vivienne Rousseau
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from .config import config
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from .logger import setup_logger, logger
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from .nats_event_bus import NatsEventBus, nats_bus
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from .service_registry import (
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ServiceRegistry,
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ServiceManifest,
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ServiceOperation,
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ServiceInstance,
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ServiceStatus,
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service_registry
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)
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from .base_service import BaseService, SimpleService
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__all__ = [
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'config',
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'setup_logger',
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'logger',
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'NatsEventBus',
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'nats_bus',
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'ServiceRegistry',
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'ServiceManifest',
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'ServiceOperation',
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'ServiceInstance',
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'ServiceStatus',
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'service_registry',
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'BaseService',
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'SimpleService',
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]
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397
core/base_service.py
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397
core/base_service.py
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"""
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Base Service Class for Vi
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Provides standardized service lifecycle management, registration, and health monitoring.
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All Vi services should inherit from this base class.
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"""
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import asyncio
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import json
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import time
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import uuid
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from abc import ABC, abstractmethod
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from typing import Dict, Any, List, Optional
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from datetime import datetime
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from .logger import setup_logger
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from .service_registry import ServiceManifest, ServiceOperation, ServiceStatus, service_registry
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logger = setup_logger('base_service')
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class BaseService(ABC):
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"""Base class for all Vi services providing standardized lifecycle management"""
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def __init__(self, service_id: str, event_bus=None):
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self.service_id = service_id
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self.event_bus = event_bus
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self.instance_id = f"{service_id}-{uuid.uuid4().hex[:8]}"
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self._running = False
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self._heartbeat_task = None
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self._health_check_task = None
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self.heartbeat_interval = 60
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self.health_check_interval = 10
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self._health_data = {}
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self._status = ServiceStatus.UNKNOWN
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self._heartbeat_failures = 0
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self._max_heartbeat_failures = 3
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self._registration_confirmed = False
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self._first_heartbeat = True
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self.logger = setup_logger(service_id, service_name=service_id)
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@abstractmethod
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def get_service_manifest(self) -> ServiceManifest:
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"""Return service manifest with operations and metadata"""
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pass
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@abstractmethod
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async def initialize_service(self):
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"""Initialize service-specific resources"""
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pass
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@abstractmethod
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async def cleanup_service(self):
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"""Cleanup service-specific resources"""
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pass
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@abstractmethod
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async def perform_health_check(self) -> Dict[str, Any]:
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"""Perform service-specific health check"""
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pass
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async def start(self, event_bus=None):
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"""Start the service with full lifecycle management"""
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if event_bus:
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self.event_bus = event_bus
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if not self.event_bus:
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raise ValueError("Event bus is required")
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try:
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self.logger.info(f"[🚀] Starting service: {self.service_id}")
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if self.service_id == 'health':
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await service_registry.initialize(self.event_bus)
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manifest = self.get_service_manifest()
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if self.service_id == 'health':
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service_registry.register_service(self.service_id, manifest, self.instance_id)
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self._registration_confirmed = True
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else:
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await self._send_registration_message(manifest)
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await self.initialize_service()
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self._running = True
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self._heartbeat_task = asyncio.create_task(self._heartbeat_loop())
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self._health_check_task = asyncio.create_task(self._health_check_loop())
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self._status = ServiceStatus.HEALTHY
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await self._send_heartbeat()
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self.logger.info(f"[✅] Service started: {self.service_id}")
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except Exception as e:
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self.logger.exception(f"[❌] Failed to start {self.service_id}: {e}")
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self._status = ServiceStatus.UNHEALTHY
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raise
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async def stop(self):
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"""Stop the service gracefully"""
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self.logger.info(f"[🛑] Stopping service: {self.service_id}")
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self._running = False
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self._status = ServiceStatus.OFFLINE
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if self._heartbeat_task:
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self._heartbeat_task.cancel()
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try:
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await self._heartbeat_task
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except asyncio.CancelledError:
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pass
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if self._health_check_task:
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self._health_check_task.cancel()
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try:
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await self._health_check_task
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except asyncio.CancelledError:
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pass
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try:
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await self.cleanup_service()
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await self._send_heartbeat()
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if self.service_id == 'health':
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service_registry.deregister_service(self.service_id)
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else:
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await self._send_deregistration_message()
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self.logger.info(f"[✅] Service stopped: {self.service_id}")
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except Exception as e:
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self.logger.exception(f"[❌] Error during shutdown: {e}")
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async def _heartbeat_loop(self):
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"""Background task to send periodic heartbeats"""
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while self._running:
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try:
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await self._send_heartbeat()
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await asyncio.sleep(self.heartbeat_interval)
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except asyncio.CancelledError:
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break
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except Exception as e:
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self.logger.exception(f"[💔] Heartbeat error: {e}")
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await asyncio.sleep(5)
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async def _health_check_loop(self):
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"""Background task for periodic health checks"""
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while self._running:
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try:
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health_data = await self.perform_health_check()
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self._health_data = health_data
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if health_data.get('healthy', True):
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if self._status == ServiceStatus.UNHEALTHY:
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self._status = ServiceStatus.HEALTHY
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self.logger.info(f"[💚] Service recovered")
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else:
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if self._status == ServiceStatus.HEALTHY:
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self._status = ServiceStatus.UNHEALTHY
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self.logger.warning(f"[💔] Service unhealthy")
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await asyncio.sleep(self.health_check_interval)
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except asyncio.CancelledError:
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break
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except Exception as e:
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self.logger.exception(f"[💔] Health check error: {e}")
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self._status = ServiceStatus.UNHEALTHY
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await asyncio.sleep(10)
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async def _send_heartbeat(self):
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"""Send heartbeat to service registry"""
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try:
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health_data = {
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'status': self._status.value,
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'timestamp': datetime.utcnow().isoformat(),
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'instance_id': self.instance_id,
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**self._health_data
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}
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if self.service_id == 'health':
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service_registry.update_service_heartbeat(self.service_id, health_data)
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self._heartbeat_failures = 0
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else:
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if self.event_bus:
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await self._send_resilient_heartbeat(health_data)
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except Exception as e:
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self.logger.exception(f"[💔] Failed to send heartbeat: {e}")
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self._heartbeat_failures += 1
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if self._heartbeat_failures >= self._max_heartbeat_failures:
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await self._attempt_reregistration()
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async def request_service(self, target_service: str, operation: str,
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payload: Dict[str, Any], timeout: float = 5.0) -> Dict[str, Any]:
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"""Make a request to another service"""
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topic = f"vi.services.{target_service}.{operation}"
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try:
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request_data = json.dumps(payload).encode()
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response_msg = await self.event_bus.client.request(topic, request_data, timeout=timeout)
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return json.loads(response_msg.data.decode())
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except Exception as e:
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self.logger.exception(f"[🔗] Request failed {target_service}.{operation}: {e}")
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raise
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async def emit_event(self, event_type: str, payload: Dict[str, Any]):
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"""Emit an event using standardized topic naming"""
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if not self.event_bus:
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raise ValueError("Event bus not available")
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await self.event_bus.emit(event_type, payload)
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def register_handler(self, operation: str, handler):
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"""Register a request-reply handler for a service operation"""
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if not self.event_bus:
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raise ValueError("Event bus not available")
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async def wrapped_handler(msg):
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try:
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result = await handler(msg)
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if result is not None:
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await msg.respond(json.dumps(result).encode())
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except Exception as e:
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error_response = {"error": str(e), "status": "error"}
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await msg.respond(json.dumps(error_response).encode())
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self.logger.error(f"Handler error for {operation}: {e}")
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topic = f"vi.services.{self.service_id}.{operation}"
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return self.event_bus.on(topic, wrapped_handler)
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def create_service_operation(self, operation_id: str, description: str,
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request_topic: Optional[str] = None,
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response_pattern: str = "request-reply",
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timeout_ms: int = 5000,
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parameters: Optional[List[Dict[str, Any]]] = None,
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metadata: Optional[Dict[str, Any]] = None) -> ServiceOperation:
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"""Helper to create a ServiceOperation"""
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if request_topic is None:
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request_topic = f"vi.services.{self.service_id}.{operation_id}"
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return ServiceOperation(
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operation_id=operation_id,
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description=description,
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request_topic=request_topic,
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response_pattern=response_pattern,
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parameters=parameters or [],
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timeout_ms=timeout_ms,
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metadata=metadata or {}
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)
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def get_status(self) -> ServiceStatus:
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return self._status
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def set_status(self, status: ServiceStatus):
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if self._status != status:
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self.logger.info(f"[📊] Status: {self._status.value} → {status.value}")
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self._status = status
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def update_health_data(self, health_data: Dict[str, Any]):
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self._health_data.update(health_data)
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def get_health_data(self) -> Dict[str, Any]:
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return self._health_data.copy()
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def get_service_info(self) -> Dict[str, Any]:
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manifest = self.get_service_manifest()
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return {
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'service_id': self.service_id,
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'instance_id': self.instance_id,
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'status': self._status.value,
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'manifest': manifest.__dict__,
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'health_data': self._health_data,
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'running': self._running
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}
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async def _send_registration_message(self, manifest: ServiceManifest):
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"""Send registration message via NATS"""
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if not self.event_bus:
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return
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registration_payload = {
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'service_id': self.service_id,
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'instance_id': self.instance_id,
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'manifest': {
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'service_id': manifest.service_id,
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'name': manifest.name,
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'description': manifest.description,
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'version': manifest.version,
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'operations': [op.__dict__ for op in manifest.operations],
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'health_check_topic': manifest.health_check_topic,
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'metadata': manifest.metadata
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}
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}
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await self.event_bus.emit("vi.services.register", registration_payload)
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self.logger.info(f"[🗂️] Registered: {self.service_id}")
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async def _send_deregistration_message(self):
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"""Send deregistration message via NATS"""
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if not self.event_bus:
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return
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await self.event_bus.emit("vi.services.deregister", {
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'service_id': self.service_id,
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'instance_id': self.instance_id
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})
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self.logger.info(f"[🗂️] Deregistered: {self.service_id}")
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async def _send_resilient_heartbeat(self, health_data: Dict[str, Any]):
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"""Send heartbeat with acknowledgment"""
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try:
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heartbeat_payload = {
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'service_id': self.service_id,
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'instance_id': self.instance_id,
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'health_data': health_data
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}
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request_data = json.dumps(heartbeat_payload).encode()
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response_msg = await self.event_bus.client.request(
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"vi.services.heartbeat",
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request_data,
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timeout=5.0
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)
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response = json.loads(response_msg.data.decode())
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acknowledged = response.get('acknowledged', False)
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if acknowledged:
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self._heartbeat_failures = 0
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if not self._registration_confirmed:
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self._registration_confirmed = True
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self.logger.info(f"[✅] Registration confirmed")
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else:
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self._registration_confirmed = False
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await self._attempt_reregistration()
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except Exception as e:
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self._heartbeat_failures += 1
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self.logger.warning(f"[💔] Heartbeat failed ({self._heartbeat_failures}): {e}")
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if self._heartbeat_failures >= self._max_heartbeat_failures:
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await self._attempt_reregistration()
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async def _attempt_reregistration(self):
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"""Attempt to re-register service"""
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self.logger.warning(f"[🔄] Re-registering {self.service_id}")
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try:
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self._heartbeat_failures = 0
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manifest = self.get_service_manifest()
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await self._send_registration_message(manifest)
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self.logger.info(f"[✅] Re-registered {self.service_id}")
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except Exception as e:
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self.logger.error(f"[❌] Re-registration failed: {e}")
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class SimpleService(BaseService):
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"""Simple implementation of BaseService"""
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def __init__(self, service_id: str, name: str = "", description: str = "",
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version: str = "1.0.0", operations: Optional[List[ServiceOperation]] = None,
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event_bus=None):
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super().__init__(service_id, event_bus)
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self._name = name or service_id
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self._description = description or f"Service: {service_id}"
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self._version = version
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self._operations = operations or []
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def get_service_manifest(self) -> ServiceManifest:
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return ServiceManifest(
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service_id=self.service_id,
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name=self._name,
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description=self._description,
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version=self._version,
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operations=self._operations,
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health_check_topic=f"vi.services.{self.service_id}.health"
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)
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async def initialize_service(self):
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pass
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async def cleanup_service(self):
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pass
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async def perform_health_check(self) -> Dict[str, Any]:
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return {
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'healthy': True,
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'checks': {
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'running': self._running,
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'event_bus': self.event_bus is not None
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}
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}
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94
core/config.py
Normal file
94
core/config.py
Normal file
@@ -0,0 +1,94 @@
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import json
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import os
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from pathlib import Path
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from typing import Dict, Any
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|
||||
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class Config:
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_instance = None
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_config_data = None
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def __new__(cls):
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if cls._instance is None:
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cls._instance = super().__new__(cls)
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return cls._instance
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def __init__(self):
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if self._config_data is None:
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self._load_config()
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def _load_config(self):
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config_path = os.path.join(os.path.dirname(__file__), '..', 'config', 'config.json')
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config_path = os.path.abspath(config_path)
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try:
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with open(config_path, 'r') as f:
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self._config_data = json.load(f)
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except FileNotFoundError:
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# Default config if file doesn't exist
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self._config_data = {
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'nats': {
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'url': 'nats://localhost:4222',
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'connection_timeout': 30,
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'max_reconnect_attempts': 10
|
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}
|
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}
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except json.JSONDecodeError as e:
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raise ValueError(f"Invalid JSON in configuration file: {e}")
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||||
def get(self, key: str, default: Any = None) -> Any:
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keys = key.split('.')
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value = self._config_data
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for k in keys:
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if isinstance(value, dict) and k in value:
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value = value[k]
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else:
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return default
|
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|
||||
return value
|
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|
||||
@property
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||||
def nats_url(self) -> str:
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||||
return os.getenv('NATS_URL') or self.get('nats.url', 'nats://localhost:4222')
|
||||
|
||||
@property
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||||
def nats_connection_timeout(self) -> int:
|
||||
return self.get('nats.connection_timeout', 30)
|
||||
|
||||
@property
|
||||
def nats_max_reconnect_attempts(self) -> int:
|
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return self.get('nats.max_reconnect_attempts', 10)
|
||||
|
||||
def get_local_services(self) -> list:
|
||||
"""Get list of services that should run on this node"""
|
||||
systemd_services = self.get('auto_upgrade.systemd_services', [])
|
||||
local_services = []
|
||||
for systemd_service in systemd_services:
|
||||
service_name = systemd_service.replace('vi-', '').replace('.service', '')
|
||||
local_services.append(service_name)
|
||||
return local_services
|
||||
|
||||
def is_service_enabled(self, service_name: str) -> bool:
|
||||
"""Check if a service is enabled on this node"""
|
||||
return service_name in self.get_local_services()
|
||||
|
||||
@property
|
||||
def project_root(self) -> Path:
|
||||
"""Get the project root directory"""
|
||||
return Path(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
|
||||
|
||||
@property
|
||||
def data_dir(self) -> Path:
|
||||
"""Get the data directory for databases"""
|
||||
data_path = os.getenv('DATA_DIR', str(self.project_root / 'data'))
|
||||
data_dir = Path(data_path)
|
||||
data_dir.mkdir(exist_ok=True, parents=True)
|
||||
return data_dir
|
||||
|
||||
|
||||
config = Config()
|
||||
|
||||
# Database paths
|
||||
SHORT_TERM_DB = config.data_dir / 'memory_active.db'
|
||||
LONG_TERM_DB = config.data_dir / 'memory_archive.db'
|
||||
73
core/logger.py
Normal file
73
core/logger.py
Normal file
@@ -0,0 +1,73 @@
|
||||
import logging
|
||||
import sys
|
||||
import os
|
||||
from datetime import datetime
|
||||
from logging.handlers import TimedRotatingFileHandler
|
||||
|
||||
|
||||
class ViFormatter(logging.Formatter):
|
||||
"""Custom formatter for Vi services with symbolic level indicators"""
|
||||
def format(self, record):
|
||||
timestamp = datetime.now().strftime('%H:%M:%S')
|
||||
level_map = {
|
||||
'DEBUG': '·',
|
||||
'INFO': '✓',
|
||||
'WARNING': '⚠',
|
||||
'ERROR': '✗',
|
||||
'CRITICAL': '☠'
|
||||
}
|
||||
level_symbol = level_map.get(record.levelname, '?')
|
||||
return f"[{timestamp}] {level_symbol} {record.getMessage()}"
|
||||
|
||||
|
||||
def _get_project_root():
|
||||
"""Find the project root directory by looking for core/ directory"""
|
||||
current_dir = os.path.dirname(os.path.abspath(__file__))
|
||||
return os.path.dirname(current_dir)
|
||||
|
||||
|
||||
def setup_logger(name="vi", level=logging.INFO, service_name=None):
|
||||
"""Set up a logger with console and optional file output"""
|
||||
# Allow environment variable to override log level
|
||||
env_level = os.getenv('LOG_LEVEL', '').upper()
|
||||
if env_level in ['DEBUG', 'INFO', 'WARNING', 'ERROR']:
|
||||
level = getattr(logging, env_level)
|
||||
|
||||
logger = logging.getLogger(name)
|
||||
|
||||
if logger.handlers:
|
||||
return logger
|
||||
|
||||
logger.setLevel(level)
|
||||
|
||||
# Console handler
|
||||
console_handler = logging.StreamHandler(sys.stdout)
|
||||
console_handler.setFormatter(ViFormatter())
|
||||
logger.addHandler(console_handler)
|
||||
|
||||
# File handler with daily rotation if service_name is specified
|
||||
if service_name:
|
||||
project_root = _get_project_root()
|
||||
logs_dir = os.path.join(project_root, 'logs')
|
||||
|
||||
if not os.path.exists(logs_dir):
|
||||
os.makedirs(logs_dir, exist_ok=True)
|
||||
|
||||
log_file = os.path.join(logs_dir, f"{service_name}.log")
|
||||
|
||||
file_handler = TimedRotatingFileHandler(
|
||||
log_file,
|
||||
when='midnight',
|
||||
interval=1,
|
||||
backupCount=30,
|
||||
encoding='utf-8'
|
||||
)
|
||||
file_handler.setFormatter(ViFormatter())
|
||||
logger.addHandler(file_handler)
|
||||
|
||||
logger.propagate = False
|
||||
|
||||
return logger
|
||||
|
||||
|
||||
logger = setup_logger()
|
||||
209
core/nats_event_bus.py
Normal file
209
core/nats_event_bus.py
Normal file
@@ -0,0 +1,209 @@
|
||||
"""
|
||||
NATS Event Bus for Vi
|
||||
|
||||
Provides pub/sub messaging, JetStream durable queues, and KV storage.
|
||||
"""
|
||||
|
||||
import json
|
||||
from nats.aio.client import Client as NATS
|
||||
from nats.errors import TimeoutError as NatsTimeoutError
|
||||
from .config import config
|
||||
from .logger import logger
|
||||
|
||||
|
||||
class NatsEventBus:
|
||||
def __init__(self):
|
||||
self.nc = NATS()
|
||||
self.subscriptions = {}
|
||||
self._connected = False
|
||||
self._js = None
|
||||
|
||||
async def connect(self, url=None):
|
||||
if self._connected:
|
||||
return
|
||||
|
||||
url = url or config.nats_url
|
||||
logger.info(f"[NATS] Connecting to {url}")
|
||||
|
||||
try:
|
||||
await self.nc.connect(
|
||||
servers=[url],
|
||||
connect_timeout=config.nats_connection_timeout,
|
||||
max_reconnect_attempts=config.nats_max_reconnect_attempts,
|
||||
)
|
||||
self._connected = True
|
||||
self._js = self.nc.jetstream()
|
||||
logger.info("[NATS] Connected successfully")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] Connection failed: {e}")
|
||||
raise
|
||||
|
||||
async def emit(self, topic, payload):
|
||||
if not self._connected:
|
||||
logger.error("[NATS] Cannot emit - EventBus is not connected")
|
||||
raise RuntimeError("EventBus is not connected")
|
||||
|
||||
try:
|
||||
await self.nc.publish(topic, json.dumps(payload).encode())
|
||||
logger.debug(f"[NATS] Emitted to {topic}")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] Failed to emit to {topic}: {e}")
|
||||
raise
|
||||
|
||||
async def on(self, topic, handler):
|
||||
if not self._connected:
|
||||
logger.error("[NATS] Cannot subscribe - EventBus is not connected")
|
||||
raise RuntimeError("EventBus is not connected")
|
||||
|
||||
async def wrapper(msg):
|
||||
try:
|
||||
data = msg.data.decode()
|
||||
logger.debug(f"[NATS] Received message on {topic}")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] Failed to decode message on {topic}: {e}")
|
||||
return
|
||||
|
||||
try:
|
||||
await handler(msg)
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] Handler error for {topic}: {e}")
|
||||
|
||||
try:
|
||||
sub = await self.nc.subscribe(topic, cb=wrapper)
|
||||
self.subscriptions[topic] = sub
|
||||
logger.info(f"[NATS] Subscribed to {topic}")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] Failed to subscribe to {topic}: {e}")
|
||||
raise
|
||||
|
||||
async def off(self, topic):
|
||||
sub = self.subscriptions.pop(topic, None)
|
||||
if sub:
|
||||
try:
|
||||
await sub.unsubscribe()
|
||||
logger.info(f"[NATS] Unsubscribed from {topic}")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] Failed to unsubscribe from {topic}: {e}")
|
||||
|
||||
async def jetstream_pull(self, stream_name, consumer_name, timeout=1.0):
|
||||
"""Pull next message from JetStream consumer"""
|
||||
if not self._connected:
|
||||
raise RuntimeError("EventBus is not connected")
|
||||
if not self._js:
|
||||
raise RuntimeError("JetStream not initialized")
|
||||
|
||||
try:
|
||||
sub = await self._js.pull_subscribe(
|
||||
subject="",
|
||||
durable=consumer_name,
|
||||
stream=stream_name,
|
||||
)
|
||||
msgs = await sub.fetch(batch=1, timeout=timeout)
|
||||
return msgs[0] if msgs else None
|
||||
except NatsTimeoutError:
|
||||
return None
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] JetStream pull error: {e}")
|
||||
raise
|
||||
|
||||
async def kv_get_bucket(self, bucket_name: str, ttl_seconds: int = 1800):
|
||||
"""Get or create a NATS KV bucket"""
|
||||
if not self._connected:
|
||||
raise RuntimeError("EventBus is not connected")
|
||||
if not self._js:
|
||||
raise RuntimeError("JetStream not initialized")
|
||||
|
||||
try:
|
||||
kv = await self._js.key_value(bucket=bucket_name)
|
||||
logger.debug(f"[NATS KV] Using existing bucket: {bucket_name}")
|
||||
return kv
|
||||
except Exception:
|
||||
try:
|
||||
kv = await self._js.create_key_value(
|
||||
bucket=bucket_name,
|
||||
ttl=ttl_seconds
|
||||
)
|
||||
logger.info(f"[NATS KV] Created bucket: {bucket_name} (TTL: {ttl_seconds}s)")
|
||||
return kv
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS KV] Failed to create bucket {bucket_name}: {e}")
|
||||
raise
|
||||
|
||||
async def kv_put(self, bucket_name: str, key: str, value: bytes, ttl_seconds: int = 1800):
|
||||
"""Put a value in a KV bucket"""
|
||||
try:
|
||||
kv = await self.kv_get_bucket(bucket_name, ttl_seconds)
|
||||
await kv.put(key, value)
|
||||
logger.debug(f"[NATS KV] Put: {bucket_name}/{key}")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS KV] Put error for {bucket_name}/{key}: {e}")
|
||||
raise
|
||||
|
||||
async def kv_get(self, bucket_name: str, key: str):
|
||||
"""Get a value from a KV bucket"""
|
||||
try:
|
||||
kv = await self.kv_get_bucket(bucket_name)
|
||||
entry = await kv.get(key)
|
||||
logger.debug(f"[NATS KV] Get: {bucket_name}/{key}")
|
||||
return entry.value if entry else None
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS KV] Get error for {bucket_name}/{key}: {e}")
|
||||
return None
|
||||
|
||||
async def kv_keys(self, bucket_name: str, filter_prefix: str = None):
|
||||
"""List keys in a KV bucket"""
|
||||
try:
|
||||
kv = await self.kv_get_bucket(bucket_name)
|
||||
keys = await kv.keys()
|
||||
if filter_prefix:
|
||||
keys = [k for k in keys if k.startswith(filter_prefix)]
|
||||
logger.debug(f"[NATS KV] Listed {len(keys)} keys from {bucket_name}")
|
||||
return keys
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS KV] Keys error for {bucket_name}: {e}")
|
||||
return []
|
||||
|
||||
async def kv_delete(self, bucket_name: str, key: str):
|
||||
"""Delete a key from a KV bucket"""
|
||||
try:
|
||||
kv = await self.kv_get_bucket(bucket_name)
|
||||
await kv.delete(key)
|
||||
logger.debug(f"[NATS KV] Deleted: {bucket_name}/{key}")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS KV] Delete error for {bucket_name}/{key}: {e}")
|
||||
raise
|
||||
|
||||
async def close(self):
|
||||
if not self._connected:
|
||||
return
|
||||
|
||||
logger.info("[NATS] Closing connection")
|
||||
try:
|
||||
await self.nc.drain()
|
||||
self._connected = False
|
||||
self.subscriptions.clear()
|
||||
self._js = None
|
||||
logger.info("[NATS] Connection closed successfully")
|
||||
except Exception as e:
|
||||
logger.error(f"[NATS] Error closing connection: {e}")
|
||||
|
||||
@property
|
||||
def is_connected(self):
|
||||
return self._connected
|
||||
|
||||
@property
|
||||
def client(self):
|
||||
"""Access to underlying NATS client for request-reply operations"""
|
||||
if not self._connected:
|
||||
raise RuntimeError("EventBus is not connected - cannot access NATS client")
|
||||
return self.nc
|
||||
|
||||
async def __aenter__(self):
|
||||
await self.connect()
|
||||
return self
|
||||
|
||||
async def __aexit__(self, exc_type, exc_val, exc_tb):
|
||||
await self.close()
|
||||
|
||||
|
||||
nats_bus = NatsEventBus()
|
||||
476
core/service_registry.py
Normal file
476
core/service_registry.py
Normal file
@@ -0,0 +1,476 @@
|
||||
"""
|
||||
Service Registry System for Vi
|
||||
|
||||
Manages service lifecycle, discovery, and health monitoring.
|
||||
"""
|
||||
|
||||
import asyncio
|
||||
import json
|
||||
import time
|
||||
from typing import Dict, Any, List, Optional, Set
|
||||
from dataclasses import dataclass, field
|
||||
from datetime import datetime
|
||||
from enum import Enum
|
||||
|
||||
from .logger import setup_logger
|
||||
|
||||
logger = setup_logger('service_registry')
|
||||
|
||||
|
||||
class ServiceStatus(Enum):
|
||||
"""Service status enumeration"""
|
||||
UNKNOWN = "unknown"
|
||||
REGISTERING = "registering"
|
||||
HEALTHY = "healthy"
|
||||
DEGRADED = "degraded"
|
||||
UNHEALTHY = "unhealthy"
|
||||
OFFLINE = "offline"
|
||||
|
||||
|
||||
@dataclass
|
||||
class ServiceOperation:
|
||||
"""Represents a service operation/endpoint"""
|
||||
operation_id: str
|
||||
description: str
|
||||
request_topic: str
|
||||
response_pattern: str = "request-reply"
|
||||
parameters: List[Dict[str, Any]] = field(default_factory=list)
|
||||
timeout_ms: int = 5000
|
||||
metadata: Dict[str, Any] = field(default_factory=dict)
|
||||
|
||||
|
||||
@dataclass
|
||||
class ServiceManifest:
|
||||
"""Service manifest containing metadata and capabilities"""
|
||||
service_id: str
|
||||
name: str = ""
|
||||
description: str = ""
|
||||
version: str = "1.0.0"
|
||||
namespace: str = "vi"
|
||||
operations: List[ServiceOperation] = field(default_factory=list)
|
||||
dependencies: List[str] = field(default_factory=list)
|
||||
health_check_topic: str = ""
|
||||
heartbeat_interval: int = 30
|
||||
metadata: Dict[str, Any] = field(default_factory=dict)
|
||||
|
||||
|
||||
@dataclass
|
||||
class ServiceInstance:
|
||||
"""Represents a specific instance of a service"""
|
||||
service_id: str
|
||||
instance_id: str
|
||||
manifest: ServiceManifest
|
||||
status: ServiceStatus = ServiceStatus.UNKNOWN
|
||||
last_heartbeat: datetime = field(default_factory=datetime.utcnow)
|
||||
last_health_check: datetime = field(default_factory=datetime.utcnow)
|
||||
health_data: Dict[str, Any] = field(default_factory=dict)
|
||||
registered_at: datetime = field(default_factory=datetime.utcnow)
|
||||
metadata: Dict[str, Any] = field(default_factory=dict)
|
||||
|
||||
|
||||
class ServiceRegistry:
|
||||
"""Central service registry managing all service discovery and health monitoring"""
|
||||
|
||||
def __init__(self, heartbeat_timeout: int = 60, health_check_interval: int = 30):
|
||||
self.services: Dict[str, ServiceInstance] = {}
|
||||
self.service_operations: Dict[str, ServiceOperation] = {}
|
||||
self.service_dependencies: Dict[str, Set[str]] = {}
|
||||
self.heartbeat_timeout = heartbeat_timeout
|
||||
self.health_check_interval = health_check_interval
|
||||
self.event_bus = None
|
||||
self._health_monitor_task = None
|
||||
self._running = False
|
||||
|
||||
async def initialize(self, event_bus):
|
||||
"""Initialize the service registry with event bus"""
|
||||
if self._running:
|
||||
logger.info("[🗂️] Re-initializing service registry")
|
||||
await self.shutdown()
|
||||
|
||||
self.event_bus = event_bus
|
||||
await self._register_handlers()
|
||||
self._running = True
|
||||
self._health_monitor_task = asyncio.create_task(self._health_monitor_loop())
|
||||
logger.info("[🗂️] Service registry initialized")
|
||||
|
||||
async def shutdown(self):
|
||||
"""Shutdown the service registry"""
|
||||
self._running = False
|
||||
|
||||
if self._health_monitor_task:
|
||||
self._health_monitor_task.cancel()
|
||||
try:
|
||||
await self._health_monitor_task
|
||||
except asyncio.CancelledError:
|
||||
pass
|
||||
|
||||
if self.event_bus:
|
||||
try:
|
||||
await self.event_bus.off("vi.services.register")
|
||||
await self.event_bus.off("vi.services.deregister")
|
||||
await self.event_bus.off("vi.services.heartbeat")
|
||||
await self.event_bus.off("vi.services.discover")
|
||||
await self.event_bus.off("vi.services.list")
|
||||
await self.event_bus.off("vi.services.health")
|
||||
except Exception as e:
|
||||
logger.debug(f"[🗂️] Handler cleanup: {e}")
|
||||
|
||||
logger.info("[🗂️] Service registry shutdown")
|
||||
|
||||
async def _register_handlers(self):
|
||||
"""Register NATS handlers for service registry operations"""
|
||||
if not self.event_bus:
|
||||
return
|
||||
|
||||
await self.event_bus.on("vi.services.register", self._handle_service_register)
|
||||
await self.event_bus.on("vi.services.deregister", self._handle_service_deregister)
|
||||
await self.event_bus.on("vi.services.heartbeat", self._handle_service_heartbeat)
|
||||
await self.event_bus.on("vi.services.discover", self._handle_service_discover)
|
||||
await self.event_bus.on("vi.services.list", self._handle_service_list)
|
||||
await self.event_bus.on("vi.services.health", self._handle_health_request)
|
||||
|
||||
logger.debug("[🗂️] Service registry handlers registered")
|
||||
|
||||
def _serialize_manifest(self, manifest: ServiceManifest) -> Dict[str, Any]:
|
||||
"""Serialize ServiceManifest to JSON-compatible dictionary"""
|
||||
return {
|
||||
'service_id': manifest.service_id,
|
||||
'name': manifest.name,
|
||||
'description': manifest.description,
|
||||
'version': manifest.version,
|
||||
'namespace': manifest.namespace,
|
||||
'operations': [op.__dict__ for op in manifest.operations],
|
||||
'dependencies': manifest.dependencies,
|
||||
'health_check_topic': manifest.health_check_topic,
|
||||
'heartbeat_interval': manifest.heartbeat_interval,
|
||||
'metadata': manifest.metadata
|
||||
}
|
||||
|
||||
def register_service(self, service_id: str, manifest: ServiceManifest,
|
||||
instance_id: Optional[str] = None) -> str:
|
||||
"""Register a service with the registry"""
|
||||
if instance_id is None:
|
||||
instance_id = f"{service_id}-{int(time.time())}"
|
||||
|
||||
instance = ServiceInstance(
|
||||
service_id=service_id,
|
||||
instance_id=instance_id,
|
||||
manifest=manifest,
|
||||
status=ServiceStatus.REGISTERING
|
||||
)
|
||||
|
||||
self.services[service_id] = instance
|
||||
|
||||
for operation in manifest.operations:
|
||||
operation_key = f"{service_id}.{operation.operation_id}"
|
||||
self.service_operations[operation_key] = operation
|
||||
|
||||
if manifest.dependencies:
|
||||
self.service_dependencies[service_id] = set(manifest.dependencies)
|
||||
|
||||
logger.info(f"[🗂️] Registered service: {service_id} (instance: {instance_id})")
|
||||
return instance_id
|
||||
|
||||
def deregister_service(self, service_id: str) -> bool:
|
||||
"""Deregister a service from the registry"""
|
||||
instance = self.services.pop(service_id, None)
|
||||
if not instance:
|
||||
logger.warning(f"[🗂️] Service {service_id} not found")
|
||||
return False
|
||||
|
||||
operations_to_remove = [
|
||||
op_key for op_key in self.service_operations.keys()
|
||||
if op_key.startswith(f"{service_id}.")
|
||||
]
|
||||
for op_key in operations_to_remove:
|
||||
self.service_operations.pop(op_key, None)
|
||||
|
||||
self.service_dependencies.pop(service_id, None)
|
||||
logger.info(f"[🗂️] Deregistered service: {service_id}")
|
||||
return True
|
||||
|
||||
def update_service_heartbeat(self, service_id: str, health_data: Optional[Dict[str, Any]] = None) -> bool:
|
||||
"""Update service heartbeat and health data"""
|
||||
instance = self.services.get(service_id)
|
||||
if not instance:
|
||||
return False
|
||||
|
||||
instance.last_heartbeat = datetime.utcnow()
|
||||
if health_data:
|
||||
instance.health_data = health_data
|
||||
|
||||
if health_data and 'status' in health_data:
|
||||
try:
|
||||
instance.status = ServiceStatus(health_data['status'])
|
||||
except ValueError:
|
||||
instance.status = ServiceStatus.UNKNOWN
|
||||
elif instance.status == ServiceStatus.REGISTERING:
|
||||
instance.status = ServiceStatus.HEALTHY
|
||||
|
||||
return True
|
||||
|
||||
def get_service(self, service_id: str) -> Optional[ServiceInstance]:
|
||||
"""Get service instance by ID"""
|
||||
return self.services.get(service_id)
|
||||
|
||||
def find_service_operation(self, service_id: str, operation_id: str) -> Optional[ServiceOperation]:
|
||||
"""Find a specific service operation"""
|
||||
return self.service_operations.get(f"{service_id}.{operation_id}")
|
||||
|
||||
def list_services(self, status_filter: Optional[ServiceStatus] = None) -> List[ServiceInstance]:
|
||||
"""List all services, optionally filtered by status"""
|
||||
services = list(self.services.values())
|
||||
if status_filter:
|
||||
services = [s for s in services if s.status == status_filter]
|
||||
return services
|
||||
|
||||
def list_service_operations(self, service_id: Optional[str] = None) -> List[ServiceOperation]:
|
||||
"""List all service operations"""
|
||||
operations = list(self.service_operations.values())
|
||||
if service_id:
|
||||
operations = [
|
||||
op for op_key, op in self.service_operations.items()
|
||||
if op_key.startswith(f"{service_id}.")
|
||||
]
|
||||
return operations
|
||||
|
||||
def check_dependencies(self, service_id: str) -> Dict[str, bool]:
|
||||
"""Check if service dependencies are available"""
|
||||
dependencies = self.service_dependencies.get(service_id, set())
|
||||
result = {}
|
||||
for dep_service_id in dependencies:
|
||||
dep_instance = self.services.get(dep_service_id)
|
||||
result[dep_service_id] = (
|
||||
dep_instance is not None and
|
||||
dep_instance.status in [ServiceStatus.HEALTHY, ServiceStatus.DEGRADED]
|
||||
)
|
||||
return result
|
||||
|
||||
async def _health_monitor_loop(self):
|
||||
"""Background task to monitor service health"""
|
||||
while self._running:
|
||||
try:
|
||||
await self._check_service_health()
|
||||
await asyncio.sleep(self.health_check_interval)
|
||||
except asyncio.CancelledError:
|
||||
break
|
||||
except Exception as e:
|
||||
logger.exception(f"[🗂️] Health monitor error: {e}")
|
||||
await asyncio.sleep(5)
|
||||
|
||||
async def _check_service_health(self):
|
||||
"""Check health of all registered services"""
|
||||
current_time = datetime.utcnow()
|
||||
|
||||
for service_id, instance in self.services.items():
|
||||
heartbeat_age = (current_time - instance.last_heartbeat).total_seconds()
|
||||
|
||||
if heartbeat_age > self.heartbeat_timeout:
|
||||
if instance.status != ServiceStatus.OFFLINE:
|
||||
logger.warning(f"[🗂️] Service {service_id} heartbeat timeout ({heartbeat_age}s)")
|
||||
instance.status = ServiceStatus.OFFLINE
|
||||
|
||||
if self.event_bus:
|
||||
await self.event_bus.emit("vi.services.health.status", {
|
||||
"service_id": service_id,
|
||||
"instance_id": instance.instance_id,
|
||||
"status": instance.status.value,
|
||||
"last_heartbeat": instance.last_heartbeat.isoformat(),
|
||||
"health_data": instance.health_data
|
||||
})
|
||||
|
||||
# NATS Event Handlers
|
||||
|
||||
async def _handle_service_register(self, msg):
|
||||
"""Handle service registration requests"""
|
||||
try:
|
||||
if hasattr(msg, 'data'):
|
||||
payload = json.loads(msg.data.decode())
|
||||
else:
|
||||
payload = msg if isinstance(msg, dict) else json.loads(msg)
|
||||
|
||||
service_id = payload.get('service_id')
|
||||
manifest_data = payload.get('manifest', {})
|
||||
instance_id = payload.get('instance_id')
|
||||
|
||||
if not service_id:
|
||||
logger.error("[🗂️] Registration error: Missing service_id")
|
||||
return
|
||||
|
||||
manifest_data.pop('service_id', None)
|
||||
|
||||
operations_data = manifest_data.pop('operations', [])
|
||||
operations = []
|
||||
for op_data in operations_data:
|
||||
if isinstance(op_data, dict):
|
||||
operation = ServiceOperation(
|
||||
operation_id=op_data.get('operation_id', ''),
|
||||
description=op_data.get('description', ''),
|
||||
request_topic=op_data.get('request_topic', ''),
|
||||
response_pattern=op_data.get('response_pattern', 'request-reply'),
|
||||
parameters=op_data.get('parameters', []),
|
||||
timeout_ms=op_data.get('timeout_ms', 5000),
|
||||
metadata=op_data.get('metadata', {})
|
||||
)
|
||||
operations.append(operation)
|
||||
else:
|
||||
operations.append(op_data)
|
||||
|
||||
manifest = ServiceManifest(service_id=service_id, operations=operations, **manifest_data)
|
||||
actual_instance_id = self.register_service(service_id, manifest, instance_id)
|
||||
logger.info(f"[🗂️] ✅ Service registered: {service_id}")
|
||||
|
||||
except Exception as e:
|
||||
logger.exception(f"[🗂️] Registration error: {e}")
|
||||
|
||||
async def _handle_service_deregister(self, msg):
|
||||
"""Handle service deregistration requests"""
|
||||
try:
|
||||
if hasattr(msg, 'data'):
|
||||
payload = json.loads(msg.data.decode())
|
||||
else:
|
||||
payload = msg if isinstance(msg, dict) else json.loads(msg)
|
||||
|
||||
service_id = payload.get('service_id')
|
||||
if service_id:
|
||||
self.deregister_service(service_id)
|
||||
except Exception as e:
|
||||
logger.exception(f"[🗂️] Deregistration error: {e}")
|
||||
|
||||
async def _handle_service_heartbeat(self, msg):
|
||||
"""Handle service heartbeat updates"""
|
||||
try:
|
||||
if hasattr(msg, 'data'):
|
||||
payload = json.loads(msg.data.decode())
|
||||
else:
|
||||
payload = msg if isinstance(msg, dict) else json.loads(msg)
|
||||
|
||||
service_id = payload.get('service_id')
|
||||
instance_id = payload.get('instance_id')
|
||||
health_data = payload.get('health_data')
|
||||
|
||||
if not service_id:
|
||||
if hasattr(msg, 'respond'):
|
||||
await msg.respond(json.dumps({'acknowledged': False}).encode())
|
||||
return
|
||||
|
||||
success = self.update_service_heartbeat(service_id, health_data)
|
||||
|
||||
response = {
|
||||
'acknowledged': success,
|
||||
'service_id': service_id,
|
||||
'instance_id': instance_id,
|
||||
'timestamp': datetime.utcnow().isoformat()
|
||||
}
|
||||
|
||||
if hasattr(msg, 'respond'):
|
||||
await msg.respond(json.dumps(response).encode())
|
||||
|
||||
except Exception as e:
|
||||
logger.exception(f"[🗂️] Heartbeat error: {e}")
|
||||
|
||||
async def _handle_service_discover(self, msg):
|
||||
"""Handle service discovery requests"""
|
||||
try:
|
||||
if hasattr(msg, 'data'):
|
||||
payload = json.loads(msg.data.decode())
|
||||
else:
|
||||
payload = msg if isinstance(msg, dict) else json.loads(msg)
|
||||
|
||||
service_id = payload.get('service_id')
|
||||
operation_id = payload.get('operation_id')
|
||||
|
||||
if service_id and operation_id:
|
||||
operation = self.find_service_operation(service_id, operation_id)
|
||||
result = operation.__dict__ if operation and hasattr(operation, '__dict__') else operation
|
||||
elif service_id:
|
||||
instance = self.get_service(service_id)
|
||||
result = {
|
||||
'service_id': instance.service_id,
|
||||
'instance_id': instance.instance_id,
|
||||
'status': instance.status.value,
|
||||
'manifest': self._serialize_manifest(instance.manifest),
|
||||
'last_heartbeat': instance.last_heartbeat.isoformat()
|
||||
} if instance else None
|
||||
else:
|
||||
services = self.list_services()
|
||||
result = [
|
||||
{
|
||||
'service_id': s.service_id,
|
||||
'status': s.status.value,
|
||||
'last_heartbeat': s.last_heartbeat.isoformat()
|
||||
}
|
||||
for s in services
|
||||
]
|
||||
|
||||
await msg.respond(json.dumps({'result': result}).encode())
|
||||
|
||||
except Exception as e:
|
||||
logger.exception(f"[🗂️] Discovery error: {e}")
|
||||
await msg.respond(json.dumps({'error': str(e)}).encode())
|
||||
|
||||
async def _handle_service_list(self, msg):
|
||||
"""Handle service listing requests"""
|
||||
try:
|
||||
if hasattr(msg, 'data'):
|
||||
payload = json.loads(msg.data.decode())
|
||||
else:
|
||||
payload = msg if isinstance(msg, dict) else json.loads(msg)
|
||||
|
||||
status_filter = payload.get('status_filter')
|
||||
status_enum = ServiceStatus(status_filter) if status_filter else None
|
||||
|
||||
services = self.list_services(status_enum)
|
||||
result = [
|
||||
{
|
||||
'service_id': s.service_id,
|
||||
'status': s.status.value,
|
||||
'name': s.manifest.name,
|
||||
'version': s.manifest.version,
|
||||
'last_heartbeat': s.last_heartbeat.isoformat()
|
||||
}
|
||||
for s in services
|
||||
]
|
||||
|
||||
await msg.respond(json.dumps({'services': result}).encode())
|
||||
|
||||
except Exception as e:
|
||||
logger.exception(f"[🗂️] List error: {e}")
|
||||
await msg.respond(json.dumps({'error': str(e)}).encode())
|
||||
|
||||
async def _handle_health_request(self, msg):
|
||||
"""Handle health status requests"""
|
||||
try:
|
||||
if hasattr(msg, 'data'):
|
||||
payload = json.loads(msg.data.decode())
|
||||
else:
|
||||
payload = msg if isinstance(msg, dict) else json.loads(msg)
|
||||
|
||||
service_id = payload.get('service_id')
|
||||
|
||||
if service_id:
|
||||
instance = self.get_service(service_id)
|
||||
result = {
|
||||
'service_id': service_id,
|
||||
'status': instance.status.value,
|
||||
'last_heartbeat': instance.last_heartbeat.isoformat(),
|
||||
'health_data': instance.health_data
|
||||
} if instance else None
|
||||
else:
|
||||
result = {
|
||||
sid: {
|
||||
'status': inst.status.value,
|
||||
'last_heartbeat': inst.last_heartbeat.isoformat(),
|
||||
'health_data': inst.health_data
|
||||
}
|
||||
for sid, inst in self.services.items()
|
||||
}
|
||||
|
||||
await msg.respond(json.dumps({'health': result}).encode())
|
||||
|
||||
except Exception as e:
|
||||
logger.exception(f"[🗂️] Health request error: {e}")
|
||||
await msg.respond(json.dumps({'error': str(e)}).encode())
|
||||
|
||||
|
||||
service_registry = ServiceRegistry()
|
||||
Reference in New Issue
Block a user