build: add Langfuse pins (#1837)

Author: anakin87

.github/workflows/langfuse.yml

@@ -65,9 +65,15 @@ jobs:
       - name: Run tests
         run: hatch run cov-retry
 
+      - name: Run unit tests with lowest direct dependencies
+        run: |
+          hatch run uv pip compile pyproject.toml --resolution lowest-direct --output-file requirements_lowest_direct.txt
+          hatch run uv pip install -r requirements_lowest_direct.txt
+          hatch run test -m "not integration"                        
       - name: Nightly - run unit tests with Haystack main branch
         if: github.event_name == 'schedule'
         run: |
+          hatch env prune
           hatch run uv pip install git+https://github.com/deepset-ai/haystack.git@main
           hatch run cov-retry -m "not integration"
 

integrations/langfuse/pyproject.toml

@@ -22,7 +22,7 @@ classifiers = [
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
 ]
-dependencies = ["haystack-ai>=2.12.1", "langfuse"]
+dependencies = ["haystack-ai>=2.13.0", "langfuse>=2.9.0"]
 
 [project.urls]
 Documentation = "https://github.com/deepset-ai/haystack-core-integrations/tree/main/integrations/langfuse#readme"

integrations/langfuse/tests/test_tracer.py

@@ -9,7 +9,7 @@
 from typing import Optional
 
 import pytest
-from haystack.dataclasses import ChatMessage, ToolCall, ToolCallResult
+from haystack.dataclasses import ChatMessage, ToolCall
 from haystack_integrations.tracing.langfuse.tracer import LangfuseTracer, LangfuseSpan, SpanContext, DefaultSpanHandler
 from haystack_integrations.tracing.langfuse.tracer import _COMPONENT_OUTPUT_KEY