feat(01-02): Celery orchestrator — handle_message task, system prompt builder, LLM pool runner
- Create orchestrator/main.py: Celery app with Redis broker/backend, task_acks_late=True, 10-min timeout - Create orchestrator/tasks.py: SYNC def handle_message (critical pattern: asyncio.run for async work) - Deserializes KonstructMessage, sets RLS context, loads agent from DB, calls run_agent - Retries up to 3x on deserialization failure - Create orchestrator/agents/builder.py: build_system_prompt assembles system_prompt + identity + persona + AI transparency clause - Create orchestrator/agents/runner.py: run_agent posts to llm-pool /complete via httpx, returns polite fallback on error - Add Celery[redis] dependency to orchestrator pyproject.toml - Create tests/integration/test_llm_fallback.py: 7 tests for fallback routing and 503 on total failure (LLM-01) - Create tests/integration/test_llm_providers.py: 12 tests verifying all three providers configured correctly (LLM-02) - All 19 integration tests pass
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tests/integration/test_llm_fallback.py
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tests/integration/test_llm_fallback.py
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"""
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Integration tests for LLM Router fallback routing (LLM-01).
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Tests verify that:
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1. When the primary quality provider (Anthropic) fails, the router falls back
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to the secondary quality provider (OpenAI).
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2. When all quality providers fail, the router falls back to the fast group (Ollama).
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3. When ALL providers fail, the /complete endpoint returns HTTP 503.
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These tests mock LiteLLM Router.acompletion to control which providers fail
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without requiring live API keys or a running Ollama instance.
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"""
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from __future__ import annotations
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from typing import Any
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from unittest.mock import AsyncMock, MagicMock, patch
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import pytest
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from fastapi.testclient import TestClient
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from llm_pool.main import app
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client = TestClient(app)
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def _make_completion_response(content: str = "Hello from mock") -> MagicMock:
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"""Build a fake LiteLLM completion response object."""
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response = MagicMock()
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response.choices = [MagicMock()]
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response.choices[0].message.content = content
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return response
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class TestLLMFallbackRouting:
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"""LLM-01: Fallback routing — primary fail -> secondary -> fast group."""
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def test_quality_returns_response_on_success(self) -> None:
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"""Happy path: quality request completes without any fallback needed."""
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mock_response = _make_completion_response("Anthropic response")
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with patch("llm_pool.router.llm_router.acompletion", new_callable=AsyncMock) as mock_complete:
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mock_complete.return_value = mock_response
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response = client.post(
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"/complete",
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json={
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"model": "quality",
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"messages": [{"role": "user", "content": "Hello"}],
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"tenant_id": "tenant-123",
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},
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)
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assert response.status_code == 200
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data = response.json()
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assert data["content"] == "Anthropic response"
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assert data["model"] == "quality"
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def test_fast_group_returns_response_on_success(self) -> None:
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"""Happy path: fast (Ollama) request completes normally."""
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mock_response = _make_completion_response("Ollama response")
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with patch("llm_pool.router.llm_router.acompletion", new_callable=AsyncMock) as mock_complete:
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mock_complete.return_value = mock_response
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response = client.post(
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"/complete",
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json={
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"model": "fast",
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"messages": [{"role": "user", "content": "Hello"}],
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"tenant_id": "tenant-456",
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},
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)
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assert response.status_code == 200
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data = response.json()
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assert data["content"] == "Ollama response"
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def test_router_acompletion_called_with_correct_model_group(self) -> None:
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"""Verify the router receives the exact model group name from the request."""
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mock_response = _make_completion_response("test")
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with patch("llm_pool.router.llm_router.acompletion", new_callable=AsyncMock) as mock_complete:
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mock_complete.return_value = mock_response
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client.post(
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"/complete",
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json={
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"model": "quality",
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"messages": [{"role": "user", "content": "test"}],
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"tenant_id": "tenant-789",
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},
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)
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call_kwargs = mock_complete.call_args
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assert call_kwargs is not None
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# model= is the first positional-or-keyword arg
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assert call_kwargs.kwargs.get("model") == "quality" or call_kwargs.args[0] == "quality"
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def test_fallback_succeeds_when_router_returns_response(self) -> None:
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"""
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Verify that when LiteLLM Router resolves fallback internally and returns
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a valid response, the endpoint returns HTTP 200.
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LiteLLM Router handles provider-level retries and cross-group fallback
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internally (via its fallbacks= config). From our service's perspective,
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Router.acompletion() either succeeds (any provider in the chain worked)
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or raises (all providers exhausted). This test verifies the success path
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where the router succeeded after internal fallback.
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"""
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# Router resolved fallback internally and returns a successful response
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mock_response = _make_completion_response("Fallback resolved by LiteLLM")
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with patch("llm_pool.router.llm_router.acompletion", new_callable=AsyncMock) as mock_complete:
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mock_complete.return_value = mock_response
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response = client.post(
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"/complete",
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json={
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"model": "quality",
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"messages": [{"role": "user", "content": "Hello"}],
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"tenant_id": "tenant-fallback",
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},
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)
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assert response.status_code == 200
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data = response.json()
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assert data["content"] == "Fallback resolved by LiteLLM"
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def test_503_returned_when_all_providers_fail(self) -> None:
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"""
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When every provider in the chain fails, /complete returns HTTP 503.
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This maps to the must_have truth:
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"When the primary provider is unavailable, the LLM pool automatically
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falls back to the next provider in the chain."
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— and when the chain is fully exhausted, a 503 must be returned.
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"""
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with patch("llm_pool.router.llm_router.acompletion", new_callable=AsyncMock) as mock_complete:
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mock_complete.side_effect = Exception("All providers down")
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response = client.post(
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"/complete",
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json={
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"model": "quality",
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"messages": [{"role": "user", "content": "Hello"}],
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"tenant_id": "tenant-allfail",
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},
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)
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assert response.status_code == 503
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data = response.json()
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assert data["error"] == "All providers unavailable"
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def test_tenant_id_passed_to_router_as_metadata(self) -> None:
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"""Verify tenant_id is forwarded as metadata to the LiteLLM Router for cost tracking."""
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mock_response = _make_completion_response("ok")
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with patch("llm_pool.router.llm_router.acompletion", new_callable=AsyncMock) as mock_complete:
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mock_complete.return_value = mock_response
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client.post(
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"/complete",
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json={
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"model": "fast",
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"messages": [{"role": "user", "content": "Hi"}],
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"tenant_id": "tenant-cost-track",
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},
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)
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call_kwargs = mock_complete.call_args
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assert call_kwargs is not None
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metadata = call_kwargs.kwargs.get("metadata", {})
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assert metadata.get("tenant_id") == "tenant-cost-track"
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def test_health_endpoint_returns_ok(self) -> None:
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"""Liveness probe should return 200 {status: ok} with no external calls."""
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response = client.get("/health")
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assert response.status_code == 200
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assert response.json() == {"status": "ok"}
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