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### What problem does this PR solve? Closes #15025 Langfuse-enabled `dialog_service.async_chat()` regressed to `langfuse_tracer.start_generation(...)` after the earlier Langfuse v4 migration. Langfuse v4 uses `start_observation(as_type="generation")`, so the remaining `start_generation` call can fail when chat tracing is enabled. This restores the migrated `start_observation(as_type="generation")` call for chat observations while preserving the existing trace context, model, input payload, and update/end flow. It also adds a regression test with a fake Langfuse v4-style client that exposes `start_observation()` but not `start_generation()`. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) ### Tests - `.venv/bin/pytest test/unit_test/api/db/services/test_dialog_service_final_answer.py -q` - `.venv/bin/ruff check api/db/services/dialog_service.py test/unit_test/api/db/services/test_dialog_service_final_answer.py`
(1). Deploy RAGFlow services and images
https://ragflow.io/docs/build_docker_image
(2). Configure the required environment for testing
Install Python dependencies (including test dependencies):
uv sync --python 3.12 --only-group test --no-default-groups --frozen
Activate the environment:
source .venv/bin/activate
Install SDK:
uv pip install sdk/python
Modify the .env file: Add the following code:
COMPOSE_PROFILES=${COMPOSE_PROFILES},tei-cpu
TEI_MODEL=BAAI/bge-small-en-v1.5
RAGFLOW_IMAGE=infiniflow/ragflow:v0.25.4 #Replace with the image you are using
Start the container（wait two minutes）:
docker compose -f docker/docker-compose.yml up -d
(3). Test Elasticsearch
a) Run sdk tests against Elasticsearch:
export HTTP_API_TEST_LEVEL=p2
export HOST_ADDRESS=http://127.0.0.1:9380 # Ensure that this port is the API port mapped to your localhost
pytest -s --tb=short --level=${HTTP_API_TEST_LEVEL} test/testcases/test_sdk_api
b) Run http api tests against Elasticsearch:
pytest -s --tb=short --level=${HTTP_API_TEST_LEVEL} test/testcases/test_http_api
(4). Test Infinity
Modify the .env file:
DOC_ENGINE=${DOC_ENGINE:-infinity}
Start the container:
docker compose -f docker/docker-compose.yml down -v
docker compose -f docker/docker-compose.yml up -d
a) Run sdk tests against Infinity:
DOC_ENGINE=infinity pytest -s --tb=short --level=${HTTP_API_TEST_LEVEL} test/testcases/test_sdk_api
b) Run http api tests against Infinity:
DOC_ENGINE=infinity pytest -s --tb=short --level=${HTTP_API_TEST_LEVEL} test/testcases/test_http_api