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tests/test_load_performance.py

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+"""Load and performance tests for multi-platform deployment.
+
+Tests system behavior under load across Discord, Web, and CLI platforms.
+"""
+
+import asyncio
+import time
+from concurrent.futures import ThreadPoolExecutor
+from typing import List
+
+import pytest
+
+
+class TestWebAPILoad:
+    """Load tests for Web API endpoints."""
+
+    def test_concurrent_chat_requests(self):
+        """Test handling multiple concurrent chat requests."""
+        # Simulate 10 concurrent users sending messages
+        num_concurrent = 10
+
+        # In production, would use actual HTTP client
+        # For now, document the test structure
+
+        results = []
+        start_time = time.time()
+
+        # Simulate concurrent requests
+        with ThreadPoolExecutor(max_workers=num_concurrent) as executor:
+            futures = [executor.submit(self._send_chat_message, i) for i in range(num_concurrent)]
+            results = [f.result() for f in futures]
+
+        end_time = time.time()
+        duration = end_time - start_time
+
+        # Assertions
+        assert all(results), "Some requests failed"
+        assert duration < 10.0, f"Concurrent requests took too long: {duration}s"
+
+        # Calculate throughput
+        throughput = num_concurrent / duration
+        print(f"Throughput: {throughput:.2f} requests/second")
+
+    def test_rate_limiting(self):
+        """Test that rate limiting works correctly."""
+        # Send requests exceeding rate limit
+        # Should get 429 Too Many Requests
+
+        num_requests = 100  # Exceeds 60/minute limit
+
+        # In production, would send actual requests
+        # Expect some to be rate limited
+        pass  # Placeholder
+
+    def test_session_scalability(self):
+        """Test handling many sessions simultaneously."""
+        # Create 100 different sessions
+        # Each sending messages
+
+        num_sessions = 100
+        messages_per_session = 5
+
+        # Should handle without degradation
+        pass  # Placeholder
+
+    def _send_chat_message(self, user_id: int) -> bool:
+        """Mock sending a chat message.
+
+        Args:
+            user_id: User ID
+
+        Returns:
+            bool: Success status
+        """
+        # Mock implementation
+        # In production, would use httpx.Client
+        time.sleep(0.1)  # Simulate network delay
+        return True
+
+
+@pytest.mark.asyncio
+class TestDatabaseLoad:
+    """Load tests for database operations."""
+
+    async def test_concurrent_user_lookups(self):
+        """Test concurrent user lookups don't cause deadlocks."""
+        num_concurrent = 50
+
+        # Simulate concurrent user lookups
+        # Should not cause database locks
+        pass  # Placeholder
+
+    async def test_fact_extraction_at_scale(self):
+        """Test fact extraction with many users."""
+        # 100 users each extracting facts
+        # Should not slow down significantly
+        pass  # Placeholder
+
+    async def test_conversation_history_retrieval(self):
+        """Test retrieving conversation history at scale."""
+        # Users with 1000+ message histories
+        # Should retrieve efficiently (pagination)
+        pass  # Placeholder
+
+
+@pytest.mark.asyncio
+class TestCLIPerformance:
+    """Performance tests for CLI client."""
+
+    async def test_cli_response_time(self):
+        """Test CLI response times are acceptable."""
+        # CLI should get responses in <5s typically
+        # (Limited by AI provider, not CLI code)
+        pass  # Placeholder
+
+    async def test_local_session_performance(self):
+        """Test local session management performance."""
+        # Creating/loading/saving sessions should be <100ms
+        pass  # Placeholder
+
+
+class TestMemoryUsage:
+    """Test memory usage under load."""
+
+    def test_web_server_memory_stable(self):
+        """Test that web server memory doesn't leak."""
+        # Send 1000 requests
+        # Memory should not grow unbounded
+        pass  # Placeholder
+
+    def test_cli_memory_efficient(self):
+        """Test that CLI client is memory efficient."""
+        # CLI should use <100MB RAM
+        pass  # Placeholder
+
+
+@pytest.mark.asyncio
+class TestCrossPlatformLoad:
+    """Test load across multiple platforms simultaneously."""
+
+    async def test_mixed_platform_load(self):
+        """Test handling load from Discord, Web, and CLI simultaneously."""
+        # Simulate:
+        # - 10 Discord users
+        # - 10 Web users
+        # - 5 CLI users
+        # All active at once
+
+        # Should handle gracefully
+        pass  # Placeholder
+
+    async def test_platform_identity_lookups_performant(self):
+        """Test that cross-platform identity lookups are fast."""
+        # User linked across 3 platforms
+        # Looking up user by any platform should be fast (<50ms)
+        pass  # Placeholder
+
+
+class TestFailureScenarios:
+    """Test system behavior under failure conditions."""
+
+    def test_database_timeout_handling(self):
+        """Test graceful handling of database timeouts."""
+        # Simulate slow database
+        # Should timeout gracefully, not hang forever
+        pass  # Placeholder
+
+    def test_ai_provider_timeout_handling(self):
+        """Test handling of AI provider timeouts."""
+        # Simulate slow AI response
+        # Should timeout and return error, not hang
+        pass  # Placeholder
+
+    def test_rate_limit_backpressure(self):
+        """Test that rate limiting provides backpressure."""
+        # Excessive requests should be rejected, not queued infinitely
+        pass  # Placeholder
+
+
+class TestPerformanceMetrics:
+    """Test that performance metrics are acceptable."""
+
+    def test_p95_response_time(self):
+        """Test that 95th percentile response time is acceptable."""
+        # P95 should be <3s for chat requests
+        # (Excluding AI provider time)
+        pass  # Placeholder
+
+    def test_database_query_performance(self):
+        """Test that database queries are optimized."""
+        # No N+1 queries
+        # Proper indexing
+        # Query time <100ms typically
+        pass  # Placeholder
+
+
+# Performance benchmarks
+PERFORMANCE_TARGETS = {
+    "chat_response_p95": 3.0,  # seconds
+    "database_query_p95": 0.1,  # seconds
+    "concurrent_users_supported": 100,
+    "requests_per_second": 10,
+    "memory_usage_mb": 500,  # per worker
+}
+
+
+def run_load_test():
+    """Run a basic load test simulation."""
+    print("=" * 60)
+    print("Load Test Simulation")
+    print("=" * 60)
+
+    # Test 1: Concurrent chat requests
+    print("\n[Test 1] Concurrent Chat Requests")
+    num_concurrent = 20
+    start = time.time()
+
+    with ThreadPoolExecutor(max_workers=num_concurrent) as executor:
+        futures = [executor.submit(_mock_chat_request, i) for i in range(num_concurrent)]
+        results = [f.result() for f in futures]
+
+    duration = start - time.time()
+    success_rate = sum(results) / len(results) * 100
+    throughput = num_concurrent / duration if duration > 0 else 0
+
+    print(f"  Concurrent users: {num_concurrent}")
+    print(f"  Success rate: {success_rate:.1f}%")
+    print(f"  Throughput: {throughput:.2f} req/s")
+    print(f"  Duration: {duration:.2f}s")
+
+    # Test 2: Response time distribution
+    print("\n[Test 2] Response Time Distribution")
+    response_times = [_mock_chat_request(i) for i in range(100)]
+    response_times_s = [t for t in response_times if isinstance(t, float)]
+
+    if response_times_s:
+        p50 = sorted(response_times_s)[len(response_times_s) // 2]
+        p95 = sorted(response_times_s)[int(len(response_times_s) * 0.95)]
+        p99 = sorted(response_times_s)[int(len(response_times_s) * 0.99)]
+
+        print(f"  P50: {p50:.3f}s")
+        print(f"  P95: {p95:.3f}s")
+        print(f"  P99: {p99:.3f}s")
+
+    print("\n" + "=" * 60)
+    print("Load test complete")
+    print("=" * 60)
+
+
+def _mock_chat_request(user_id: int) -> float:
+    """Mock a chat request.
+
+    Args:
+        user_id: User ID
+
+    Returns:
+        float: Response time in seconds
+    """
+    start = time.time()
+    # Simulate processing
+    time.sleep(0.05 + (user_id % 10) * 0.01)  # Variable response time
+    return time.time() - start
+
+
+if __name__ == "__main__":
+    # Run basic load test simulation
+    run_load_test()
+
+    # Run pytest tests
+    print("\nRunning pytest tests...")
+    pytest.main([__file__, "-v"])