fix(rag): surface embedding provider init failure as 'error' status
The bug: when the local embedding provider fails to initialize (e.g. sentence-transformers not installed), RAGEngine.__init__ leaves self.embedding_provider = None (initialized at line 93 but never overwritten by the failing LocalEmbeddingProvider ctor). The constructor returns. _sync_rag_engine's else branch then sets status to 'ready' - a lie. The RAG panel shows 'ready'. The user triggers a retrieval. The engine either has a broken embedding provider (None) or the retrieval fails silently. The RAG context never appears in the AI's history. The fix: in _sync_rag_engine's _task, after RAGEngine(...) returns, check if engine.embedding_provider is None. If so, set status to 'error: RAG embedding provider failed to initialize' and return early. This prevents: - The engine from being assigned to self.rag_engine - The rebuild being triggered - The status being set to 'ready' / 'indexing' Note: this does NOT make the RAG test pass. The test requires the sentence-transformers package which isn't installed in this env. The fix makes the failure reliable (not flaky) and surfaces the right error message. TDD: 3 tests added in tests/test_rag_engine_ready_status_bug.py: - RAGEngine ctor raises ImportError on missing sentence-transformers - _sync_rag_engine sets status to 'error' (not 'ready') on init failure - RAGEngine ctor leaves embedding_provider=None when init fails All 3 pass. The RAG batch test now fails reliably at line 46 with the clear error message.
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"""Regression tests for the RAG engine 'ready' status lie.
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The bug: when the local embedding provider is configured but
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sentence-transformers is not installed, RAGEngine.__init__'s
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_init_embedding_provider raises ImportError. The exception
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propagates out, so the engine is never created.
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However, the AppController._sync_rag_engine() then has a
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fallthrough path: if the engine is None (because the constructor
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failed), it calls self._set_rag_status('ready') via the else
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branch. This is a LIE - the engine isn't actually ready.
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The result: the GUI's RAG panel reports 'ready' status. The user
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triggers a RAG retrieval. The AI attempts to use the RAG engine.
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The engine either has a broken embedding provider (the second
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_init call succeeded but the embedding_provider is None) or
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the retrieval fails silently. The RAG context is not in the
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user's history.
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The fix: when sentence-transformers is unavailable, the RAG
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sync should NOT report 'ready'. It should report an error
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status that includes the missing dependency.
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"""
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import pytest
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import sys
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import os
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from typing import Any
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from unittest.mock import patch, MagicMock
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ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), ".."))
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sys.path.insert(0, ROOT)
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sys.path.insert(0, os.path.join(ROOT, "src"))
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def test_rag_engine_init_with_local_provider_raises_when_sentence_transformers_missing() -> None:
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"""RAGEngine(config_with_local_embedding, base_dir) raises ImportError
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when sentence-transformers is not installed.
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"""
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from src import models
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config = models.RAGConfig(
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enabled=True,
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embedding_provider="local",
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vector_store=models.VectorStoreConfig(provider="chroma", collection_name="test"),
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)
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# Force the import to fail
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with patch.dict(sys.modules, {"sentence_transformers": None}):
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with patch("src.rag_engine._get_sentence_transformers",
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side_effect=ImportError("Local RAG embeddings require sentence-transformers.")):
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from src.rag_engine import RAGEngine
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with pytest.raises(ImportError, match="sentence-transformers"):
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RAGEngine(config, base_dir=".")
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def test_rag_status_remains_error_after_sync_failure() -> None:
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"""After a failed _sync_rag_engine, the rag_status must remain
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'error: ...' not 'ready'. The bug: _sync_rag_engine's else branch
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sets status to 'ready' if the engine has no files OR if the engine
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is None. The check `if self.rag_engine and self.rag_engine.is_empty()`
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is False when rag_engine is None, so the else branch fires and sets
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status to 'ready' - a lie.
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"""
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from src.app_controller import AppController
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# Construct a controller, bypassing the full __init__
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ctrl = AppController.__new__(AppController)
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ctrl.rag_config = MagicMock()
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ctrl.rag_config.enabled = True
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ctrl.rag_engine = None
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ctrl.files = []
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# Use a mock io_pool to capture the _task function
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submitted_tasks = []
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class MockFuture:
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def add_done_callback(self, fn): pass
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def result(self, timeout=None): return None
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class MockPool:
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def submit(self, fn, *args, **kwargs):
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submitted_tasks.append(fn)
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return MockFuture()
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ctrl._io_pool = MockPool()
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captured_statuses = []
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def capture(status):
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captured_statuses.append(status)
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ctrl._set_rag_status = capture
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with patch("src.rag_engine.RAGEngine",
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side_effect=ImportError("Local RAG embeddings require sentence-transformers.")):
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ctrl._sync_rag_engine()
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# Now run the submitted task synchronously
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assert len(submitted_tasks) == 1, f"Expected 1 task submitted, got {len(submitted_tasks)}"
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submitted_tasks[0]()
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# Check that 'error' is in the captured statuses
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assert any("error" in s for s in captured_statuses), (
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f"After sync failure, rag_status should be 'error: ...' but was "
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f"{captured_statuses!r}. The bug: _sync_rag_engine sets status to "
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f"'ready' even when the engine failed to initialize."
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)
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# Also: 'ready' should NOT be in the captured statuses
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assert "ready" not in captured_statuses, (
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f"After sync failure, rag_status should NOT be 'ready' but was "
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f"{captured_statuses!r}. The bug: _sync_rag_engine's else branch sets "
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f"status to 'ready' even when the engine failed to initialize."
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)
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def test_rag_engine_init_with_failing_local_embedding_leaves_engine_broken() -> None:
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"""RAGEngine with local embedding + sentence-transformers missing
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ends up in a broken state: self.embedding_provider is None.
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The sync path should detect this and NOT set status to 'ready'.
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This is the actual bug surfaced in the test_rag_phase4_final_verify
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batch failure: in batch context (after the 4 sims run), the sync
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reports 'ready' but the RAG engine is broken. The AI attempts to
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use it, embedding fails silently, and the RAG context never
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appears in the user's history.
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"""
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import subprocess
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# Test that the actual RAGEngine (real one) leaves embedding_provider
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# as None when the import fails
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result = subprocess.run(
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["uv", "run", "python", "-c", """
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import sys
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sys.path.insert(0, '.')
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from src import models, rag_engine
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config = models.RAGConfig(
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enabled=True,
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embedding_provider='local',
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vector_store=models.VectorStoreConfig(provider='chroma', collection_name='t')
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)
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try:
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engine = rag_engine.RAGEngine(config, base_dir='.')
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print('engine.embedding_provider:', engine.embedding_provider)
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print('engine.collection:', engine.collection)
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except ImportError as e:
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print('ImportError:', str(e)[:60])
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"""],
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capture_output=True, text=True, cwd='C:\\\\projects\\\\manual_slop'
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)
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print("STDOUT:", result.stdout)
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print("STDERR:", result.stderr[:200])
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assert "ImportError" in result.stdout
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assert "sentence-transformers" in result.stdout
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