Add support for streaming responses when dirty app actions return
generators (sync or async). This enables real-time delivery of
incremental results for use cases like LLM token generation.
Features:
- Streaming protocol with chunk/end/error message types
- Worker support for sync and async generators
- Arbiter forwarding of streaming messages
- Deadline-based timeout handling
- Async client streaming API
Protocol:
- Chunk messages (type: "chunk") contain partial data
- End messages (type: "end") signal stream completion
- Error messages can occur mid-stream
New files:
- benchmarks/dirty_streaming.py: Streaming benchmark suite
- tests/dirty/test_*_streaming*.py: Streaming test coverage
- docs/content/dirty.md: Streaming documentation with examples
Replace lock-based request serialization with queue-based approach:
- Each worker now has a dedicated asyncio.Queue and consumer task
- route_request() submits (request, future) to queue and awaits future
- Consumer task processes requests sequentially per worker
- No lock contention - pure async queue operations
Benefits:
- Clearer separation of concerns
- Better visibility into request backlog (queue.qsize())
- Eliminates lock contention under high concurrency
Changes:
- worker_locks dict replaced with worker_queues and worker_consumers
- Added _start_worker_consumer() to create queue and consumer per worker
- Added _execute_on_worker() for actual worker communication
- Updated _cleanup_worker() to cancel consumer tasks
- Updated stop() to cancel all consumers before shutdown
Benchmark results (4 workers, isolated):
- throughput_10ms: 333 req/s, 0 failures
- overload_10ms (200 clients): 334 req/s, 0 failures
- All tests pass with perfect round-robin distribution
