feat(context): implement Redis-based caching layer (#84)
Phase 6 of Context Management Engine - Caching Layer: - Add ContextCache with Redis integration - Support fingerprint-based assembled context caching - Support token count caching (model-specific) - Support score caching (scorer + context + query) - Add in-memory fallback with LRU eviction - Add cache invalidation with pattern matching - Add cache statistics reporting Key features: - Hierarchical cache key structure (ctx:type:hash) - Automatic TTL expiration - Memory cache for fast repeated access - Graceful degradation when Redis unavailable Tests: 29 new tests, 285 total context tests passing 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
479
backend/tests/services/context/test_cache.py
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479
backend/tests/services/context/test_cache.py
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"""Tests for context cache module."""
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from unittest.mock import AsyncMock, MagicMock
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import pytest
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from app.services.context.cache import ContextCache
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from app.services.context.config import ContextSettings
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from app.services.context.exceptions import CacheError
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from app.services.context.types import (
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AssembledContext,
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ContextPriority,
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KnowledgeContext,
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SystemContext,
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TaskContext,
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)
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class TestContextCacheBasics:
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"""Basic tests for ContextCache."""
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def test_creation(self) -> None:
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"""Test cache creation without Redis."""
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cache = ContextCache()
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assert cache._redis is None
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assert not cache.is_enabled
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def test_creation_with_settings(self) -> None:
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"""Test cache creation with custom settings."""
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settings = ContextSettings(
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cache_prefix="test",
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cache_ttl_seconds=60,
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)
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cache = ContextCache(settings=settings)
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assert cache._prefix == "test"
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assert cache._ttl == 60
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def test_set_redis(self) -> None:
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"""Test setting Redis connection."""
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cache = ContextCache()
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mock_redis = MagicMock()
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cache.set_redis(mock_redis)
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assert cache._redis is mock_redis
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def test_is_enabled(self) -> None:
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"""Test is_enabled property."""
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(settings=settings)
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assert not cache.is_enabled # No Redis
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cache.set_redis(MagicMock())
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assert cache.is_enabled
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# Disabled in settings
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settings2 = ContextSettings(cache_enabled=False)
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cache2 = ContextCache(redis=MagicMock(), settings=settings2)
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assert not cache2.is_enabled
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def test_cache_key(self) -> None:
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"""Test cache key generation."""
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cache = ContextCache()
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key = cache._cache_key("assembled", "abc123")
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assert key == "ctx:assembled:abc123"
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def test_hash_content(self) -> None:
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"""Test content hashing."""
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hash1 = ContextCache._hash_content("hello world")
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hash2 = ContextCache._hash_content("hello world")
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hash3 = ContextCache._hash_content("different")
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assert hash1 == hash2
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assert hash1 != hash3
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assert len(hash1) == 32
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class TestFingerprintComputation:
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"""Tests for fingerprint computation."""
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def test_compute_fingerprint(self) -> None:
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"""Test fingerprint computation."""
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cache = ContextCache()
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contexts = [
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SystemContext(content="System", source="system"),
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TaskContext(content="Task", source="task"),
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]
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fp1 = cache.compute_fingerprint(contexts, "query", "claude-3")
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fp2 = cache.compute_fingerprint(contexts, "query", "claude-3")
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fp3 = cache.compute_fingerprint(contexts, "different", "claude-3")
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assert fp1 == fp2 # Same inputs = same fingerprint
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assert fp1 != fp3 # Different query = different fingerprint
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assert len(fp1) == 32
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def test_fingerprint_includes_priority(self) -> None:
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"""Test that fingerprint changes with priority."""
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cache = ContextCache()
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# Use KnowledgeContext since SystemContext has __post_init__ that may override
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ctx1 = [
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KnowledgeContext(
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content="Knowledge",
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source="docs",
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priority=ContextPriority.NORMAL.value,
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)
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]
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ctx2 = [
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KnowledgeContext(
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content="Knowledge",
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source="docs",
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priority=ContextPriority.HIGH.value,
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)
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]
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fp1 = cache.compute_fingerprint(ctx1, "query", "claude-3")
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fp2 = cache.compute_fingerprint(ctx2, "query", "claude-3")
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assert fp1 != fp2
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def test_fingerprint_includes_model(self) -> None:
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"""Test that fingerprint changes with model."""
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cache = ContextCache()
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contexts = [SystemContext(content="System", source="system")]
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fp1 = cache.compute_fingerprint(contexts, "query", "claude-3")
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fp2 = cache.compute_fingerprint(contexts, "query", "gpt-4")
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assert fp1 != fp2
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class TestMemoryCache:
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"""Tests for in-memory caching."""
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def test_memory_cache_fallback(self) -> None:
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"""Test memory cache when Redis unavailable."""
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cache = ContextCache()
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# Should use memory cache
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cache._set_memory("test-key", "42")
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assert "test-key" in cache._memory_cache
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assert cache._memory_cache["test-key"][0] == "42"
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def test_memory_cache_eviction(self) -> None:
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"""Test memory cache eviction."""
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cache = ContextCache()
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cache._max_memory_items = 10
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# Fill cache
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for i in range(15):
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cache._set_memory(f"key-{i}", f"value-{i}")
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# Should have evicted some items
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assert len(cache._memory_cache) < 15
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class TestAssembledContextCache:
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"""Tests for assembled context caching."""
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@pytest.mark.asyncio
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async def test_get_assembled_no_redis(self) -> None:
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"""Test get_assembled without Redis returns None."""
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cache = ContextCache()
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result = await cache.get_assembled("fingerprint")
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assert result is None
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@pytest.mark.asyncio
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async def test_get_assembled_not_found(self) -> None:
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"""Test get_assembled when key not found."""
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mock_redis = AsyncMock()
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mock_redis.get.return_value = None
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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result = await cache.get_assembled("fingerprint")
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assert result is None
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@pytest.mark.asyncio
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async def test_get_assembled_found(self) -> None:
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"""Test get_assembled when key found."""
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# Create a context
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ctx = AssembledContext(
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content="Test content",
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total_tokens=100,
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context_count=2,
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)
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mock_redis = AsyncMock()
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mock_redis.get.return_value = ctx.to_json()
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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result = await cache.get_assembled("fingerprint")
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assert result is not None
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assert result.content == "Test content"
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assert result.total_tokens == 100
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assert result.cache_hit is True
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assert result.cache_key == "fingerprint"
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@pytest.mark.asyncio
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async def test_set_assembled(self) -> None:
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"""Test set_assembled."""
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mock_redis = AsyncMock()
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settings = ContextSettings(cache_enabled=True, cache_ttl_seconds=60)
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cache = ContextCache(redis=mock_redis, settings=settings)
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ctx = AssembledContext(
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content="Test content",
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total_tokens=100,
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context_count=2,
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)
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await cache.set_assembled("fingerprint", ctx)
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mock_redis.setex.assert_called_once()
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call_args = mock_redis.setex.call_args
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assert call_args[0][0] == "ctx:assembled:fingerprint"
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assert call_args[0][1] == 60 # TTL
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@pytest.mark.asyncio
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async def test_set_assembled_custom_ttl(self) -> None:
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"""Test set_assembled with custom TTL."""
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mock_redis = AsyncMock()
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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ctx = AssembledContext(
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content="Test",
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total_tokens=10,
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context_count=1,
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)
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await cache.set_assembled("fp", ctx, ttl=120)
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call_args = mock_redis.setex.call_args
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assert call_args[0][1] == 120
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@pytest.mark.asyncio
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async def test_cache_error_on_get(self) -> None:
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"""Test CacheError raised on Redis error."""
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mock_redis = AsyncMock()
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mock_redis.get.side_effect = Exception("Redis error")
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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with pytest.raises(CacheError):
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await cache.get_assembled("fingerprint")
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@pytest.mark.asyncio
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async def test_cache_error_on_set(self) -> None:
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"""Test CacheError raised on Redis error."""
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mock_redis = AsyncMock()
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mock_redis.setex.side_effect = Exception("Redis error")
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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ctx = AssembledContext(
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content="Test",
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total_tokens=10,
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context_count=1,
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)
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with pytest.raises(CacheError):
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await cache.set_assembled("fp", ctx)
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class TestTokenCountCache:
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"""Tests for token count caching."""
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@pytest.mark.asyncio
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async def test_get_token_count_memory_fallback(self) -> None:
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"""Test get_token_count uses memory cache."""
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cache = ContextCache()
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# Set in memory
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key = cache._cache_key("tokens", "default", cache._hash_content("hello"))
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cache._set_memory(key, "42")
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result = await cache.get_token_count("hello")
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assert result == 42
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@pytest.mark.asyncio
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async def test_set_token_count_memory(self) -> None:
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"""Test set_token_count stores in memory."""
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cache = ContextCache()
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await cache.set_token_count("hello", 42)
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result = await cache.get_token_count("hello")
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assert result == 42
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@pytest.mark.asyncio
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async def test_set_token_count_with_model(self) -> None:
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"""Test set_token_count with model-specific tokenization."""
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mock_redis = AsyncMock()
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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await cache.set_token_count("hello", 42, model="claude-3")
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await cache.set_token_count("hello", 50, model="gpt-4")
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# Different models should have different keys
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assert mock_redis.setex.call_count == 2
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calls = mock_redis.setex.call_args_list
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key1 = calls[0][0][0]
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key2 = calls[1][0][0]
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assert "claude-3" in key1
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assert "gpt-4" in key2
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class TestScoreCache:
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"""Tests for score caching."""
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@pytest.mark.asyncio
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async def test_get_score_memory_fallback(self) -> None:
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"""Test get_score uses memory cache."""
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cache = ContextCache()
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# Set in memory
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query_hash = cache._hash_content("query")[:16]
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key = cache._cache_key("score", "relevance", "ctx-123", query_hash)
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cache._set_memory(key, "0.85")
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result = await cache.get_score("relevance", "ctx-123", "query")
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assert result == 0.85
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@pytest.mark.asyncio
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async def test_set_score_memory(self) -> None:
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"""Test set_score stores in memory."""
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cache = ContextCache()
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await cache.set_score("relevance", "ctx-123", "query", 0.85)
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result = await cache.get_score("relevance", "ctx-123", "query")
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assert result == 0.85
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@pytest.mark.asyncio
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async def test_set_score_with_redis(self) -> None:
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"""Test set_score with Redis."""
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mock_redis = AsyncMock()
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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await cache.set_score("relevance", "ctx-123", "query", 0.85)
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mock_redis.setex.assert_called_once()
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class TestCacheInvalidation:
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"""Tests for cache invalidation."""
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@pytest.mark.asyncio
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async def test_invalidate_pattern(self) -> None:
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"""Test invalidate with pattern."""
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mock_redis = AsyncMock()
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# Set up scan_iter to return matching keys
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async def mock_scan_iter(match=None):
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for key in ["ctx:assembled:1", "ctx:assembled:2"]:
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yield key
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mock_redis.scan_iter = mock_scan_iter
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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deleted = await cache.invalidate("assembled:*")
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assert deleted == 2
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assert mock_redis.delete.call_count == 2
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@pytest.mark.asyncio
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async def test_clear_all(self) -> None:
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"""Test clear_all."""
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mock_redis = AsyncMock()
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async def mock_scan_iter(match=None):
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for key in ["ctx:1", "ctx:2", "ctx:3"]:
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yield key
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mock_redis.scan_iter = mock_scan_iter
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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# Add to memory cache
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cache._set_memory("test", "value")
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assert len(cache._memory_cache) > 0
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deleted = await cache.clear_all()
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assert deleted == 3
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assert len(cache._memory_cache) == 0
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class TestCacheStats:
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"""Tests for cache statistics."""
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@pytest.mark.asyncio
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async def test_get_stats_no_redis(self) -> None:
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"""Test get_stats without Redis."""
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cache = ContextCache()
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cache._set_memory("key", "value")
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stats = await cache.get_stats()
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assert stats["enabled"] is True
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assert stats["redis_available"] is False
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assert stats["memory_items"] == 1
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@pytest.mark.asyncio
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async def test_get_stats_with_redis(self) -> None:
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"""Test get_stats with Redis."""
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mock_redis = AsyncMock()
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mock_redis.info.return_value = {"used_memory_human": "1.5M"}
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settings = ContextSettings(cache_enabled=True, cache_ttl_seconds=300)
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cache = ContextCache(redis=mock_redis, settings=settings)
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stats = await cache.get_stats()
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assert stats["enabled"] is True
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assert stats["redis_available"] is True
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assert stats["ttl_seconds"] == 300
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assert stats["redis_memory_used"] == "1.5M"
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class TestCacheIntegration:
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"""Integration tests for cache."""
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@pytest.mark.asyncio
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async def test_full_workflow(self) -> None:
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"""Test complete cache workflow."""
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mock_redis = AsyncMock()
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mock_redis.get.return_value = None
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settings = ContextSettings(cache_enabled=True)
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cache = ContextCache(redis=mock_redis, settings=settings)
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contexts = [
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SystemContext(content="System", source="system"),
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KnowledgeContext(content="Knowledge", source="docs"),
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]
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# Compute fingerprint
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fp = cache.compute_fingerprint(contexts, "query", "claude-3")
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assert len(fp) == 32
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# Check cache (miss)
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result = await cache.get_assembled(fp)
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assert result is None
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# Create and cache assembled context
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assembled = AssembledContext(
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content="Assembled content",
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total_tokens=100,
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context_count=2,
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model="claude-3",
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)
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await cache.set_assembled(fp, assembled)
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# Verify setex was called
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mock_redis.setex.assert_called_once()
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# Mock cache hit
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mock_redis.get.return_value = assembled.to_json()
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result = await cache.get_assembled(fp)
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assert result is not None
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assert result.cache_hit is True
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assert result.content == "Assembled content"
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