258 lines
10 KiB
Python
258 lines
10 KiB
Python
# ================================================================
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# services/notification/app/main.py - ENHANCED WITH SSE SUPPORT
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# ================================================================
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"""
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Notification Service Main Application
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Handles email, WhatsApp notifications and SSE for real-time alerts/recommendations
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"""
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from fastapi import FastAPI
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from sqlalchemy import text
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from app.core.config import settings
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from app.core.database import database_manager
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from app.api.notifications import router as notification_router
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from app.api.sse_routes import router as sse_router
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from app.services.messaging import setup_messaging, cleanup_messaging
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from app.services.sse_service import SSEService
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from app.services.notification_orchestrator import NotificationOrchestrator
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from app.services.email_service import EmailService
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from app.services.whatsapp_service import WhatsAppService
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from shared.service_base import StandardFastAPIService
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class NotificationService(StandardFastAPIService):
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"""Notification Service with standardized setup"""
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expected_migration_version = "00001"
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async def on_startup(self, app):
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"""Custom startup logic including migration verification"""
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await self.verify_migrations()
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await super().on_startup(app)
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async def verify_migrations(self):
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"""Verify database schema matches the latest migrations."""
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try:
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async with self.database_manager.get_session() as session:
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result = await session.execute(text("SELECT version_num FROM alembic_version"))
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version = result.scalar()
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if version != self.expected_migration_version:
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self.logger.error(f"Migration version mismatch: expected {self.expected_migration_version}, got {version}")
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raise RuntimeError(f"Migration version mismatch: expected {self.expected_migration_version}, got {version}")
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self.logger.info(f"Migration verification successful: {version}")
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except Exception as e:
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self.logger.error(f"Migration verification failed: {e}")
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raise
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def __init__(self):
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# Define expected database tables for health checks
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notification_expected_tables = [
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'notifications', 'notification_templates', 'notification_preferences',
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'notification_logs', 'email_templates', 'whatsapp_templates'
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]
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self.sse_service = None
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self.orchestrator = None
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self.email_service = None
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self.whatsapp_service = None
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# Define custom metrics for notification service
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notification_custom_metrics = {
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"notifications_sent_total": {
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"type": "counter",
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"description": "Total notifications sent",
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"labels": ["type", "status", "channel"]
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},
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"emails_sent_total": {
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"type": "counter",
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"description": "Total emails sent",
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"labels": ["status"]
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},
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"whatsapp_sent_total": {
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"type": "counter",
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"description": "Total WhatsApp messages sent",
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"labels": ["status"]
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},
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"sse_events_sent_total": {
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"type": "counter",
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"description": "Total SSE events sent",
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"labels": ["tenant", "event_type"]
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},
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"notification_processing_duration_seconds": {
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"type": "histogram",
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"description": "Time spent processing notifications"
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}
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}
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# Define custom health checks for notification service components
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async def check_email_service():
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"""Check email service health - service is ready even if credentials are invalid"""
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try:
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if not self.email_service:
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return False
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# Service is considered healthy if it's initialized, even if credentials fail
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# This allows the pod to be ready while external services may have config issues
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await self.email_service.health_check()
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return True
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except Exception as e:
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# Log but don't fail readiness - email service config issues shouldn't block the pod
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self.logger.error("Email service health check failed", error=str(e))
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# Return True to indicate service is ready (initialized) even if credentials are wrong
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return True
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async def check_whatsapp_service():
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"""Check WhatsApp service health - service is ready even if credentials are invalid"""
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try:
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if not self.whatsapp_service:
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return False
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# Service is considered healthy if it's initialized, even if credentials fail
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await self.whatsapp_service.health_check()
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return True
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except Exception as e:
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# Log but don't fail readiness - WhatsApp config issues shouldn't block the pod
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self.logger.error("WhatsApp service health check failed", error=str(e))
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# Return True to indicate service is ready (initialized) even if credentials are wrong
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return True
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async def check_sse_service():
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"""Check SSE service health"""
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try:
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if self.sse_service:
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metrics = self.sse_service.get_metrics()
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return bool(metrics.get("redis_connected", False))
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return False
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except Exception as e:
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self.logger.error("SSE service health check failed", error=str(e))
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return False
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async def check_messaging():
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"""Check messaging service health"""
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try:
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from app.services.messaging import notification_publisher
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return bool(notification_publisher and notification_publisher.connected)
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except Exception as e:
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self.logger.error("Messaging health check failed", error=str(e))
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return False
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super().__init__(
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service_name="notification-service",
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app_name="Bakery Notification Service",
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description="Email, WhatsApp and SSE notification service for bakery alerts and recommendations",
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version="2.0.0",
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log_level=settings.LOG_LEVEL,
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cors_origins=getattr(settings, 'CORS_ORIGINS', ["*"]),
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api_prefix="/api/v1",
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database_manager=database_manager,
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expected_tables=notification_expected_tables,
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custom_health_checks={
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"email_service": check_email_service,
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"whatsapp_service": check_whatsapp_service,
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"sse_service": check_sse_service,
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"messaging": check_messaging
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},
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enable_messaging=True,
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custom_metrics=notification_custom_metrics
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)
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async def _setup_messaging(self):
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"""Setup messaging for notification service"""
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await setup_messaging()
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self.logger.info("Messaging initialized")
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async def _cleanup_messaging(self):
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"""Cleanup messaging for notification service"""
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await cleanup_messaging()
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async def on_startup(self, app: FastAPI):
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"""Custom startup logic for notification service"""
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# Initialize services
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self.email_service = EmailService()
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self.whatsapp_service = WhatsAppService()
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# Initialize SSE service
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self.sse_service = SSEService(settings.REDIS_URL)
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await self.sse_service.initialize()
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self.logger.info("SSE service initialized")
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# Create orchestrator
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self.orchestrator = NotificationOrchestrator(
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email_service=self.email_service,
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whatsapp_service=self.whatsapp_service,
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sse_service=self.sse_service
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)
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# Store services in app state
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app.state.orchestrator = self.orchestrator
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app.state.sse_service = self.sse_service
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app.state.email_service = self.email_service
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app.state.whatsapp_service = self.whatsapp_service
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async def on_shutdown(self, app: FastAPI):
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"""Custom shutdown logic for notification service"""
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# Shutdown SSE service
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if self.sse_service:
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await self.sse_service.shutdown()
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self.logger.info("SSE service shutdown completed")
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def get_service_features(self):
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"""Return notification-specific features"""
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return [
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"email_notifications",
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"whatsapp_notifications",
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"sse_real_time_updates",
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"notification_templates",
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"notification_orchestration",
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"messaging_integration",
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"multi_channel_support"
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]
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def setup_custom_endpoints(self):
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"""Setup custom endpoints for notification service"""
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# SSE metrics endpoint
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@self.app.get("/sse-metrics")
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async def sse_metrics():
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"""Get SSE service metrics"""
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if self.sse_service:
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try:
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sse_metrics = self.sse_service.get_metrics()
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return {
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'active_tenants': sse_metrics.get('active_tenants', 0),
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'total_connections': sse_metrics.get('total_connections', 0),
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'active_listeners': sse_metrics.get('active_listeners', 0),
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'redis_connected': bool(sse_metrics.get('redis_connected', False))
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}
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except Exception as e:
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return {"error": str(e)}
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return {"error": "SSE service not available"}
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# Metrics endpoint
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@self.app.get("/metrics")
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async def metrics():
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"""Prometheus metrics endpoint"""
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if self.metrics_collector:
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return self.metrics_collector.get_metrics()
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return {"metrics": "not_available"}
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# Create service instance
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service = NotificationService()
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# Create FastAPI app with standardized setup
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app = service.create_app(
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docs_url="/docs",
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redoc_url="/redoc"
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)
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# Setup standard endpoints
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service.setup_standard_endpoints()
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# Setup custom endpoints
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service.setup_custom_endpoints()
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# Include routers
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service.add_router(notification_router, tags=["notifications"])
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service.add_router(sse_router, tags=["sse"])
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if __name__ == "__main__":
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import uvicorn
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uvicorn.run(app, host="0.0.0.0", port=8000) |