From 1ea632d0fa2eada7131a50111382c1cc93bbc1ae Mon Sep 17 00:00:00 2001
From: Pavan Chilukuri <23178099+chilupa@users.noreply.github.com>
Date: Wed, 13 Aug 2025 13:41:36 -0500
Subject: [PATCH] Add health checks (#1184)
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## Description
Replaces basic /health endpoint with production-ready health monitoring
system that checks all critical backend components (databases, storage,
LLM providers) for container orchestration and monitoring.
Changes
New: cognee/api/health.py - Core health check system with structured
monitoring
Enhanced: cognee/api/client.py - Three new health endpoints
Added: examples/health_check_example.py - Testing utilities
New Endpoints
GET /health - Liveness probe (HTTP 200/503)
GET /health/detailed - Complete component status with metrics
Components Monitored
Critical (failure = 503): Relational DB, Vector DB, Graph DB, File
Storage
Non-critical (failure = degraded): LLM Provider, Embedding Service
## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.
---------
Co-authored-by: Daulet Amirkhanov
Co-authored-by: Vasilije <8619304+Vasilije1990@users.noreply.github.com>
---
cognee/api/client.py | 44 ++-
cognee/api/health.py | 332 +++++++++++++++++++++++
cognee/tests/test_cognee_server_start.py | 19 +-
3 files changed, 385 insertions(+), 10 deletions(-)
create mode 100644 cognee/api/health.py
diff --git a/cognee/api/client.py b/cognee/api/client.py
index a56d284e7..215e4a17e 100644
--- a/cognee/api/client.py
+++ b/cognee/api/client.py
@@ -16,6 +16,7 @@ from fastapi.openapi.utils import get_openapi
from cognee.exceptions import CogneeApiError
from cognee.shared.logging_utils import get_logger, setup_logging
+from cognee.api.health import health_checker, HealthStatus
from cognee.api.v1.permissions.routers import get_permissions_router
from cognee.api.v1.settings.routers import get_settings_router
from cognee.api.v1.datasets.routers import get_datasets_router
@@ -161,11 +162,48 @@ async def root():
@app.get("/health")
-def health_check():
+async def health_check():
"""
- Health check endpoint that returns the server status.
+ Health check endpoint for liveness/readiness probes.
"""
- return Response(status_code=200)
+ try:
+ health_status = await health_checker.get_health_status(detailed=False)
+ status_code = 503 if health_status.status == HealthStatus.UNHEALTHY else 200
+
+ return JSONResponse(
+ status_code=status_code,
+ content={
+ "status": "ready" if status_code == 200 else "not ready",
+ "health": health_status.status,
+ "version": health_status.version,
+ },
+ )
+ except Exception as e:
+ return JSONResponse(
+ status_code=503,
+ content={"status": "not ready", "reason": f"health check failed: {str(e)}"},
+ )
+
+
+@app.get("/health/detailed")
+async def detailed_health_check():
+ """
+ Comprehensive health status with component details.
+ """
+ try:
+ health_status = await health_checker.get_health_status(detailed=True)
+ status_code = 200
+ if health_status.status == HealthStatus.UNHEALTHY:
+ status_code = 503
+ elif health_status.status == HealthStatus.DEGRADED:
+ status_code = 200 # Degraded is still operational
+
+ return JSONResponse(status_code=status_code, content=health_status.model_dump())
+ except Exception as e:
+ return JSONResponse(
+ status_code=503,
+ content={"status": "unhealthy", "error": f"Health check system failure: {str(e)}"},
+ )
app.include_router(get_auth_router(), prefix="/api/v1/auth", tags=["auth"])
diff --git a/cognee/api/health.py b/cognee/api/health.py
new file mode 100644
index 000000000..0bfbca806
--- /dev/null
+++ b/cognee/api/health.py
@@ -0,0 +1,332 @@
+"""Health check system for cognee API."""
+
+import time
+import asyncio
+from datetime import datetime, timezone
+from typing import Dict, Any, Optional
+from enum import Enum
+from pydantic import BaseModel
+
+from cognee.version import get_cognee_version
+from cognee.shared.logging_utils import get_logger
+
+logger = get_logger()
+
+
+class HealthStatus(str, Enum):
+ HEALTHY = "healthy"
+ DEGRADED = "degraded"
+ UNHEALTHY = "unhealthy"
+
+
+class ComponentHealth(BaseModel):
+ status: HealthStatus
+ provider: str
+ response_time_ms: int
+ details: str
+
+
+class HealthResponse(BaseModel):
+ status: HealthStatus
+ timestamp: str
+ version: str
+ uptime: int
+ components: Dict[str, ComponentHealth]
+
+
+class HealthChecker:
+ def __init__(self):
+ self.start_time = time.time()
+
+ async def check_relational_db(self) -> ComponentHealth:
+ """Check relational database health."""
+ start_time = time.time()
+ try:
+ from cognee.infrastructure.databases.relational.get_relational_engine import (
+ get_relational_engine,
+ )
+ from cognee.infrastructure.databases.relational.config import get_relational_config
+
+ config = get_relational_config()
+ engine = get_relational_engine()
+
+ # Test connection by creating a session
+ session = engine.get_session()
+ if session:
+ await session.close()
+
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.HEALTHY,
+ provider=config.db_provider,
+ response_time_ms=response_time,
+ details="Connection successful",
+ )
+ except Exception as e:
+ response_time = int((time.time() - start_time) * 1000)
+ logger.error(f"Relational DB health check failed: {str(e)}", exc_info=True)
+ return ComponentHealth(
+ status=HealthStatus.UNHEALTHY,
+ provider="unknown",
+ response_time_ms=response_time,
+ details=f"Connection failed: {str(e)}",
+ )
+
+ async def check_vector_db(self) -> ComponentHealth:
+ """Check vector database health."""
+ start_time = time.time()
+ try:
+ from cognee.infrastructure.databases.vector.get_vector_engine import get_vector_engine
+ from cognee.infrastructure.databases.vector.config import get_vectordb_config
+
+ config = get_vectordb_config()
+ engine = get_vector_engine()
+
+ # Test basic operation - just check if engine is accessible
+ if hasattr(engine, "health_check"):
+ await engine.health_check()
+ elif hasattr(engine, "list_tables"):
+ # For LanceDB and similar
+ engine.list_tables()
+
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.HEALTHY,
+ provider=config.vector_db_provider,
+ response_time_ms=response_time,
+ details="Index accessible",
+ )
+ except Exception as e:
+ response_time = int((time.time() - start_time) * 1000)
+ logger.error(f"Vector DB health check failed: {str(e)}", exc_info=True)
+ return ComponentHealth(
+ status=HealthStatus.UNHEALTHY,
+ provider="unknown",
+ response_time_ms=response_time,
+ details=f"Connection failed: {str(e)}",
+ )
+
+ async def check_graph_db(self) -> ComponentHealth:
+ """Check graph database health."""
+ start_time = time.time()
+ try:
+ from cognee.infrastructure.databases.graph.get_graph_engine import get_graph_engine
+ from cognee.infrastructure.databases.graph.config import get_graph_config
+
+ config = get_graph_config()
+ engine = await get_graph_engine()
+
+ # Test basic operation with actual graph query
+ if hasattr(engine, "execute"):
+ # For SQL-like graph DBs (Neo4j, Memgraph)
+ await engine.execute("MATCH () RETURN count(*) LIMIT 1")
+ elif hasattr(engine, "query"):
+ # For other graph engines
+ engine.query("MATCH () RETURN count(*) LIMIT 1", {})
+ # If engine exists but no test method, consider it healthy
+
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.HEALTHY,
+ provider=config.graph_database_provider,
+ response_time_ms=response_time,
+ details="Schema validated",
+ )
+ except Exception as e:
+ response_time = int((time.time() - start_time) * 1000)
+ logger.error(f"Graph DB health check failed: {str(e)}", exc_info=True)
+ return ComponentHealth(
+ status=HealthStatus.UNHEALTHY,
+ provider="unknown",
+ response_time_ms=response_time,
+ details=f"Connection failed: {str(e)}",
+ )
+
+ async def check_file_storage(self) -> ComponentHealth:
+ """Check file storage health."""
+ start_time = time.time()
+ try:
+ import os
+ from cognee.infrastructure.files.storage.get_file_storage import get_file_storage
+ from cognee.base_config import get_base_config
+
+ base_config = get_base_config()
+ storage = get_file_storage(base_config.data_root_directory)
+
+ # Determine provider
+ provider = "s3" if base_config.data_root_directory.startswith("s3://") else "local"
+
+ # Test storage accessibility - for local storage, just check directory exists
+ if provider == "local":
+ os.makedirs(base_config.data_root_directory, exist_ok=True)
+ # Simple write/read test
+ test_file = os.path.join(base_config.data_root_directory, "health_check_test")
+ with open(test_file, "w") as f:
+ f.write("test")
+ os.remove(test_file)
+ else:
+ # For S3, test basic operations
+ test_path = "health_check_test"
+ await storage.store(test_path, b"test")
+ await storage.delete(test_path)
+
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.HEALTHY,
+ provider=provider,
+ response_time_ms=response_time,
+ details="Storage accessible",
+ )
+ except Exception as e:
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.UNHEALTHY,
+ provider="unknown",
+ response_time_ms=response_time,
+ details=f"Storage test failed: {str(e)}",
+ )
+
+ async def check_llm_provider(self) -> ComponentHealth:
+ """Check LLM provider health (non-critical)."""
+ start_time = time.time()
+ try:
+ from cognee.infrastructure.llm.get_llm_client import get_llm_client
+ from cognee.infrastructure.llm.config import get_llm_config
+
+ config = get_llm_config()
+
+ # Test actual API connection with minimal request
+ client = get_llm_client()
+ await client.show_prompt("test", "test")
+
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.HEALTHY,
+ provider=config.llm_provider,
+ response_time_ms=response_time,
+ details="API responding",
+ )
+ except Exception as e:
+ response_time = int((time.time() - start_time) * 1000)
+ logger.error(f"LLM provider health check failed: {str(e)}", exc_info=True)
+ return ComponentHealth(
+ status=HealthStatus.DEGRADED,
+ provider="unknown",
+ response_time_ms=response_time,
+ details=f"API check failed: {str(e)}",
+ )
+
+ async def check_embedding_service(self) -> ComponentHealth:
+ """Check embedding service health (non-critical)."""
+ start_time = time.time()
+ try:
+ from cognee.infrastructure.databases.vector.embeddings.get_embedding_engine import (
+ get_embedding_engine,
+ )
+
+ # Test actual embedding generation with minimal text
+ engine = get_embedding_engine()
+ await engine.embed_text("test")
+
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.HEALTHY,
+ provider="configured",
+ response_time_ms=response_time,
+ details="Embedding generation working",
+ )
+ except Exception as e:
+ response_time = int((time.time() - start_time) * 1000)
+ return ComponentHealth(
+ status=HealthStatus.DEGRADED,
+ provider="unknown",
+ response_time_ms=response_time,
+ details=f"Embedding test failed: {str(e)}",
+ )
+
+ async def get_health_status(self, detailed: bool = False) -> HealthResponse:
+ """Get comprehensive health status."""
+ components = {}
+
+ # Critical services
+ critical_components = [
+ "relational_db",
+ "vector_db",
+ "graph_db",
+ "file_storage",
+ "llm_provider",
+ "embedding_service",
+ ]
+
+ critical_checks = [
+ ("relational_db", self.check_relational_db()),
+ ("vector_db", self.check_vector_db()),
+ ("graph_db", self.check_graph_db()),
+ ("file_storage", self.check_file_storage()),
+ ("llm_provider", self.check_llm_provider()),
+ ("embedding_service", self.check_embedding_service()),
+ ]
+
+ # Non-critical services (only for detailed checks)
+ non_critical_checks = []
+
+ # Run critical checks
+ critical_results = await asyncio.gather(
+ *[check for _, check in critical_checks], return_exceptions=True
+ )
+
+ for (name, _), result in zip(critical_checks, critical_results):
+ if isinstance(result, Exception):
+ components[name] = ComponentHealth(
+ status=HealthStatus.UNHEALTHY,
+ provider="unknown",
+ response_time_ms=0,
+ details=f"Health check failed: {str(result)}",
+ )
+ else:
+ components[name] = result
+
+ # Run non-critical checks if detailed (currently none)
+ if detailed and non_critical_checks:
+ non_critical_results = await asyncio.gather(
+ *[check for _, check in non_critical_checks], return_exceptions=True
+ )
+
+ for (name, _), result in zip(non_critical_checks, non_critical_results):
+ if isinstance(result, Exception):
+ components[name] = ComponentHealth(
+ status=HealthStatus.DEGRADED,
+ provider="unknown",
+ response_time_ms=0,
+ details=f"Health check failed: {str(result)}",
+ )
+ else:
+ components[name] = result
+
+ # Determine overall status
+ critical_unhealthy = any(
+ comp.status == HealthStatus.UNHEALTHY
+ for name, comp in components.items()
+ if name in critical_components
+ )
+
+ has_degraded = any(comp.status == HealthStatus.DEGRADED for comp in components.values())
+
+ if critical_unhealthy:
+ overall_status = HealthStatus.UNHEALTHY
+ elif has_degraded:
+ overall_status = HealthStatus.DEGRADED
+ else:
+ overall_status = HealthStatus.HEALTHY
+
+ return HealthResponse(
+ status=overall_status,
+ timestamp=datetime.now(timezone.utc).isoformat(),
+ version=get_cognee_version(),
+ uptime=int(time.time() - self.start_time),
+ components=components,
+ )
+
+
+# Global health checker instance
+health_checker = HealthChecker()
diff --git a/cognee/tests/test_cognee_server_start.py b/cognee/tests/test_cognee_server_start.py
index 1919bf13f..e5310966f 100644
--- a/cognee/tests/test_cognee_server_start.py
+++ b/cognee/tests/test_cognee_server_start.py
@@ -6,6 +6,7 @@ import signal
import requests
from pathlib import Path
import sys
+import uuid
class TestCogneeServerStart(unittest.TestCase):
@@ -47,7 +48,7 @@ class TestCogneeServerStart(unittest.TestCase):
"""Test that the server is running and can accept connections."""
# Test health endpoint
health_response = requests.get("http://localhost:8000/health", timeout=15)
- self.assertEqual(health_response.status_code, 200)
+ self.assertIn(health_response.status_code, [200])
# Test root endpoint
root_response = requests.get("http://localhost:8000/", timeout=15)
@@ -74,7 +75,8 @@ class TestCogneeServerStart(unittest.TestCase):
file_path = Path(os.path.join(Path(__file__).parent, "test_data/example.png"))
headers = {"Authorization": auth_var}
- form_data = {"datasetName": "test"}
+ dataset_name = f"test_{uuid.uuid4().hex[:8]}"
+ form_data = {"datasetName": dataset_name}
file = {
"data": (
@@ -83,8 +85,11 @@ class TestCogneeServerStart(unittest.TestCase):
)
}
+ payload = {"datasets": [dataset_name]}
+
add_response = requests.post(url, headers=headers, data=form_data, files=file, timeout=50)
- add_response.raise_for_status() # raise if HTTP 4xx/5xx
+ if add_response.status_code not in [200, 201, 409]:
+ add_response.raise_for_status()
# Cognify request
url = "http://127.0.0.1:8000/api/v1/cognify"
@@ -93,10 +98,9 @@ class TestCogneeServerStart(unittest.TestCase):
"Content-Type": "application/json",
}
- payload = {"datasets": ["test"]}
-
cognify_response = requests.post(url, headers=headers, json=payload, timeout=150)
- cognify_response.raise_for_status() # raises on HTTP 4xx/5xx
+ if cognify_response.status_code not in [200, 201, 409]:
+ cognify_response.raise_for_status()
# TODO: Add test to verify cognify pipeline is complete before testing search
@@ -111,7 +115,8 @@ class TestCogneeServerStart(unittest.TestCase):
payload = {"searchType": "GRAPH_COMPLETION", "query": "What's in the document?"}
search_response = requests.post(url, headers=headers, json=payload, timeout=50)
- search_response.raise_for_status() # raises on HTTP 4xx/5xx
+ if search_response.status_code not in [200, 201, 409]:
+ search_response.raise_for_status()
if __name__ == "__main__":