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MediGuard AI — Health Router
Provides /health and /health/ready with per-service checks.
"""
from __future__ import annotations
import time
from datetime import UTC, datetime
from fastapi import APIRouter, Request
from src.schemas.schemas import HealthResponse, ServiceHealth
router = APIRouter(tags=["health"])
@router.get("/health", response_model=HealthResponse)
async def health_check(request: Request) -> HealthResponse:
"""Shallow liveness probe."""
app_state = request.app.state
uptime = time.time() - getattr(app_state, "start_time", time.time())
return HealthResponse(
status="healthy",
timestamp=datetime.now(UTC).isoformat(),
version=getattr(app_state, "version", "2.0.0"),
uptime_seconds=round(uptime, 2),
)
@router.get("/health/ready", response_model=HealthResponse)
async def readiness_check(request: Request) -> HealthResponse:
"""Deep readiness probe — checks all backing services."""
app_state = request.app.state
uptime = time.time() - getattr(app_state, "start_time", time.time())
services: list[ServiceHealth] = []
overall = "healthy"
# --- PostgreSQL ---
try:
from sqlalchemy import text
from src.database import _engine
engine = _engine()
if engine is not None:
t0 = time.time()
with engine.connect() as conn:
conn.execute(text("SELECT 1"))
latency = (time.time() - t0) * 1000
services.append(ServiceHealth(name="postgresql", status="ok", latency_ms=round(latency, 1)))
else:
services.append(ServiceHealth(name="postgresql", status="unavailable", detail="Engine not initialized"))
except Exception as exc:
services.append(ServiceHealth(name="postgresql", status="unavailable", detail=str(exc)[:100]))
# --- OpenSearch ---
try:
os_client = getattr(app_state, "opensearch_client", None)
if os_client is not None:
t0 = time.time()
info = os_client.health()
latency = (time.time() - t0) * 1000
os_status = info.get("status", "unknown")
services.append(
ServiceHealth(
name="opensearch",
status="ok" if os_status in ("green", "yellow") else "degraded",
latency_ms=round(latency, 1),
)
)
else:
services.append(ServiceHealth(name="opensearch", status="unavailable"))
except Exception as exc:
services.append(ServiceHealth(name="opensearch", status="unavailable", detail=str(exc)[:100]))
overall = "degraded"
# --- Redis ---
try:
cache = getattr(app_state, "cache", None)
if cache is not None:
t0 = time.time()
cache.set("__health__", "ok", ttl=10)
latency = (time.time() - t0) * 1000
services.append(ServiceHealth(name="redis", status="ok", latency_ms=round(latency, 1)))
else:
services.append(ServiceHealth(name="redis", status="unavailable"))
except Exception as exc:
services.append(ServiceHealth(name="redis", status="unavailable", detail=str(exc)[:100]))
# --- Ollama ---
try:
ollama = getattr(app_state, "ollama_client", None)
if ollama is not None:
t0 = time.time()
health_info = ollama.health()
latency = (time.time() - t0) * 1000
is_healthy = isinstance(health_info, dict) and health_info.get("status") == "ok"
services.append(
ServiceHealth(name="ollama", status="ok" if is_healthy else "degraded", latency_ms=round(latency, 1))
)
else:
services.append(ServiceHealth(name="ollama", status="unavailable"))
except Exception as exc:
services.append(ServiceHealth(name="ollama", status="unavailable", detail=str(exc)[:100]))
overall = "degraded"
# --- Langfuse ---
try:
tracer = getattr(app_state, "tracer", None)
if tracer is not None and tracer.enabled:
services.append(ServiceHealth(name="langfuse", status="ok"))
else:
services.append(ServiceHealth(name="langfuse", status="unavailable", detail="Disabled or not configured"))
except Exception as exc:
services.append(ServiceHealth(name="langfuse", status="unavailable", detail=str(exc)[:100]))
# --- FAISS (local retriever) ---
try:
from src.services.retrieval.factory import make_retriever
retriever = make_retriever(backend="faiss")
if retriever is not None:
doc_count = retriever.doc_count()
services.append(ServiceHealth(name="faiss", status="ok", detail=f"{doc_count} docs indexed"))
else:
services.append(ServiceHealth(name="faiss", status="unavailable"))
except Exception as exc:
services.append(ServiceHealth(name="faiss", status="unavailable", detail=str(exc)[:100]))
# Determine overall status
critical_services = ["opensearch", "ollama", "faiss"]
if any(s.status == "unavailable" for s in services if s.name in critical_services):
overall = "unhealthy"
elif any(s.status == "degraded" for s in services):
overall = "degraded"
return HealthResponse(
status=overall,
timestamp=datetime.now(UTC).isoformat(),
version=getattr(app_state, "version", "2.0.0"),
uptime_seconds=round(uptime, 2),
services=services,
)
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