Upload app.main.example.py

Add gateway example with auth and routing

app.main.example.py

@@ -0,0 +1,38 @@
+from fastapi import FastAPI, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from pydantic import BaseModel, Field
+import httpx, os
+
+app = FastAPI(title="Healthcare Inference Gateway")
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
+
+class InferenceRequest(BaseModel):
+  content_type: str = Field(..., regex="^(image/.*|text/.*|application/json)$")
+  payload: dict
+
+def verify_token(token: str = Depends(oauth2_scheme)):
+  if not token:
+    raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
+  return token
+
+@app.get("/health")
+def health(): return {"status":"ok"}
+
+@app.post("/infer")
+async def infer(req: InferenceRequest, token: str = Depends(verify_token)):
+  # Conditional routing to preprocessor
+  normalized = req.payload
+  if req.content_type.startswith(("image/","text/")):
+    target = os.getenv("PREPROCESSOR_URL", "http://preprocessor-svc")
+    async with httpx.AsyncClient(timeout=10) as client:
+      resp = await client.post(f"{target}/preprocess", json=req.payload)
+      resp.raise_for_status()
+      normalized = resp.json()
+
+  # Forward to Triton (HTTP)
+  async with httpx.AsyncClient(timeout=15) as client:
+    triton = os.getenv("TRITON_URL", "http://triton-service:8000")
+    infer_resp = await client.post(f"{triton}/v2/models/<model>/infer", json=normalized)
+    infer_resp.raise_for_status()
+    return infer_resp.json()