bloom-filter-cache-penetration-prevention

{"output": "total 20\ndrwxr-xr-x 1 root root 4096 Mar  4 09:15 .\ndrwxr-xr-x 1 root root 4096 Apr 23 04:17 ..\ndrwxr-xr-x 2 root root 4096 Mar  4 09:15 data\ndrwxr-xr-x 2 root root 4096 Mar  4 09:15 output\ndrwxr-xr-x 2 root root 4096 Mar  4 09:15 tests", "exit_code": 0, "error": null}

I'll implement a Bloom Filter-based cache penetration prevention system for an e-commerce platform. Let me start by exploring the environment and then building the solution.

→ terminal({"command": "ls -la /app/"})

{"output": "total 8\ndrwxr-xr-x 2 root root 4096 Mar  4 09:15 .\ndrwxr-xr-x 1 root root 4096 Mar  4 09:15 ..", "exit_code": 0, "error": null}

{"output": "Python 3.13.12\nWARNING: The directory '/root/.cache/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you should use sudo's -H flag.\nbitarray          2.9.2\nfakeredis         2.25.0\nfastapi           0.115.0\nredis             5.2.0\nuvicorn           0.32.0", "exit_code": 0, "error": null}

{"bytes_written": 21137, "dirs_created": true}

Good, all required packages are available. Now let me create the complete implementation:

→ write_file({"path": "/app/main.py", "content": "\"\"\"\nBloom Filter-based Cache Penetration Prevention System\n\nThis module implements a high-performance product lookup system that uses:\n1. Bloom Filter for fast pre-filtering of non-existent product IDs\n2. Redis cache for efficient data caching\n3. SQLite database for persistent storage\n\nThe primary goal is to reduce database roundtrips by filtering ou…)

{"bytes_written": 160, "dirs_created": true}

Now let me create a test data file and verify the implementation:

→ write_file({"path": "/app/data/products.txt", "content": "A000001\nA000002\nA000003\nA000004\nA000005\nA000006\nA000007\nA000008\nA000009\nA000010\nA000011\nA000012\nA000013\nA000014\nA000015\nA000016\nA000017\nA000018\nA000019\nA000020\n"})

{"output": "Traceback (most recent call last):\n  File \"<string>\", line 2, in <module>\n    import main\n  File \"/app/main.py\", line 234, in <module>\n    redis_client = redis.from_url(REDIS_URL, decode_responses=True)\n  File \"/usr/local/lib/python3.13/site-packages/redis/utils.py\", line 42, in from_url\n    return Redis.from_url(url, **kwargs)\n           ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.13/site-packages/redis/client.py\", line 145, in from_url\n    connection_pool = ConnectionPool.from_url(url, **kwargs)\n  File \"/usr/local/lib/python3.13/site-packages/redis/connection.py\", line 1274, in from_url\n    url_options = parse_url(url)\n  File \"/usr/local/lib/python3.13/site-packages/redis/connection.py\", line 1168, in parse_url\n    raise ValueError(\n    ...<2 lines>...\n    )\nValueError: Redis URL must specify one of the following schemes (redis://, rediss://, unix://)", "exit_code": 1, "error": null}

{"success": true, "diff": "--- a//app/main.py\n+++ b//app/main.py\n@@ -228,10 +228,36 @@\n # Redis Client Initialization\n # ============================================================================\n \n+def get_redis_client() -> redis.Redis:\n+    \"\"\"\n+    Get Redis client instance.\n+    \n+    Uses redis.from_url() for compatibility with both real Redis and fakeredis.\n+    When REDIS_URL=fakeredis://, the fakeredis library will be used automatically.\n+    \n+    Returns:\n+        Redis client instance\n+    \"\"\"\n+    import redis\n+    REDIS_URL = os.getenv(\"REDIS_URL\", \"redis://localhost:6379/0\")\n+    \n+    # Handle fakeredis special case\n+    if \"fakeredis\" in REDIS_URL.lower():\n+        try:\n+            import fakeredis\n+            # Try to parse the URL or use default\n+            if REDIS_URL == \"fakeredis://\":\n+                return fakeredis.FakeRedis(decode_responses=True)\n+            return fakeredis.FakeRedis.from_url(REDIS_URL, decode_responses=True)\n+        except ImportError:\n+            # Fallback to regular redis if fakeredis not available\n+            return redis.Redis.from_url(REDIS_URL, decode_responses=True)\n+    \n+    return redis.from_url(REDIS_URL, decode_responses=True)\n+\n+\n # Initialize Redis client at module load time\n-# Using redis.from_url() for compatibility with both real Redis and fakeredis\n-REDIS_URL = os.getenv(\"REDIS_URL\", \"fakeredis://\")\n-redis_client = redis.from_url(REDIS_URL, decode_responses=True)\n+redis_client = get_redis_client()\n \n \n # ============================================================================\n", "files_modified": ["/app/main.py"], "lint": {"status": "ok", "output": ""}}

I need to fix the Redis URL handling. The issue is that fakeredis uses a different URL scheme:

→ patch({"path": "/app/main.py", "old_string": "# ============================================================================\n# Redis Client Initialization\n# ============================================================================\n\n# Initialize Redis client at module load time\n# Using redis.from_url() for compatibility with both real Redis and fakeredis\nREDIS_URL = os.getenv(\"REDIS_URL\", \"fa…)

{"output": "Warning: Failed to save Bloom Filter to Redis: Error 111 connecting to localhost:6379. Connection refused.\nModule imported successfully!\nBit array size: 9585058\nHash function count: 6\nExpected items: 1000000\nFalse positive rate: 0.01\nBloom filter count: 20\nCurrent items in bloom: 20", "exit_code": 0, "error": null}

{"output": "Traceback (most recent call last):\n  File \"/usr/local/lib/python3.13/site-packages/starlette/testclient.py\", line 33, in <module>\n    import httpx\nModuleNotFoundError: No module named 'httpx'\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"<string>\", line 3, in <module>\n    from fastapi.testclient import TestClient\n  File \"/usr/local/lib/python3.13/site-packages/fastapi/testclient.py\", line 1, in <module>\n    from starlette.testclient import TestClient as TestClient  # noqa\n    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.13/site-packages/starlette/testclient.py\", line 35, in <module>\n    raise RuntimeError(\n    ...<3 lines>...\n    )\nRuntimeError: The starlette.testclient module requires the httpx package to be installed.\nYou can install this with:\n    $ pip install httpx\n\nWarning: Failed to save Bloom Filter to Redis: Error 111 connecting to localhost:6379. Connection refused.", "exit_code": 1, "error": null}

The module imports successfully. Now let me test the FastAPI application:

→ terminal({"command": "cd /app && python3 -c \"\nimport main\nfrom fastapi.testclient import TestClient\n\nclient = TestClient(main.app)\n\n# Test health endpoint\nresponse = client.get('/health')\nprint('Health check:', response.json())\n\n# Test bloom stats\nresponse = client.get('/bloom/stats')\nprint('Bloom stats:', response.json())\n\n# Test metrics\nresponse = client.get('/metrics')\nprint('Metrics:',…)

{"output": "WARNING: The directory '/root/.cache/pip' or its parent directory is not owned or is not writable by the current user. The cache has been disabled. Check the permissions and owner of that directory. If executing pip with sudo, you should use sudo's -H flag.\nWARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager, possibly rendering your system unusable. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv. Use the --root-user-action option if you know what you are doing and want to suppress this warning.\n\n[notice] A new release of pip is available: 25.3 -> 26.0.1\n[notice] To update, run: pip install --upgrade pip", "exit_code": 0, "error": null}

{"output": "Traceback (most recent call last):\n  File \"<string>\", line 28, in <module>\n    response = client.post('/products', json={'id': 'NEW001', 'name': 'New Product', 'price': 19.99})\n  File \"/usr/local/lib/python3.13/site-packages/starlette/testclient.py\", line 597, in post\n    return super().post(\n           ~~~~~~~~~~~~^\n        url,\n        ^^^^\n    ...<10 lines>...\n        extensions=extensions,\n        ^^^^^^^^^^^^^^^^^^^^^^\n    )\n    ^\n  File \"/usr/local/lib/python3.13/site-packages/httpx/_client.py\", line 1144, in post\n    return self.request(\n           ~~~~~~~~~~~~^\n        \"POST\",\n        ^^^^^^^\n    ...<11 lines>...\n        extensions=extensions,\n        ^^^^^^^^^^^^^^^^^^^^^^\n    )\n    ^\n  File \"/usr/local/lib/python3.13/site-packages/starlette/testclient.py\", line 488, in request\n    return super().request(\n           ~~~~~~~~~~~~~~~^\n        method,\n        ^^^^^^^\n    ...<11 lines>...\n        extensions=extensions,\n        ^^^^^^^^^^^^^^^^^^^^^^\n    )\n    ^\n  File \"/usr/local/lib/python3.13/site-packages/httpx/_client.py\", line 825, in request\n    return self.send(request, auth=auth, follow_redirects=follow_redirects)\n           ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.13/site-packages/httpx/_client.py\", line 914, in send\n    response = self._send_handling_auth(\n        request,\n    ...<2 lines>...\n        history=[],\n    )\n  File \"/usr/local/lib/python3.13/site-packages/httpx/_client.py\", line 942, in _send_handling_auth\n    response = self._send_handling_redirects(\n        request,\n        follow_redirects=follow_redirects,\n        history=history,\n    )\n  File \"/usr/local/lib/python3.13/site-packages/httpx/_client.py\", line 979, in _send_handling_redirects\n    response = self._send_single_request(request)\n  File \"/usr/local/lib/python3.13/site-packages/httpx/_client.py\", line 1014, in _send_single_request\n    response = transport.handle_request(request)\n  File \"/usr/local/lib/python3.13/site-packages/starlette/testclient.py\", line 381, in handle_request\n    raise exc\n  File \"/usr/local/lib/python3.13/site-packages/starlette/testclient.py\", line 378, in handle_request\n    portal.call(self.app, scope, receive, send)\n    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.13/site-packages/anyio/from_thread.py\", line 334, in call\n    return cast(T_Retval, self.start_task_soon(func, *args).result())\n                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^\n  File \"/usr/local/lib/python3.13/concurrent/futures/_base.py\", line 456, in result\n    return self.__get_result()\n           ~~~~~~~~~~~~~~~~~^^\n  File \"/usr/local/lib/python3.13/concurrent/futures/_base.py\", line 401, in __get_result\n    raise self._exception\n  File \"/usr/local/lib/python3.13/site-packages/anyio/from_thread.py\", line 259, in _call_func\n    retval = await retval_or_awaitable\n             ^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/usr/local/lib/python3.13/site-packages/fastapi/applications.py\", line 1054, in __call__\n    await super().__call__(scope, receive, send)\n  File \"/usr/local/lib/python3.13/site-packages/starlette/applications.py\", line 113, in __call__\n    await self.middleware_stack(scope, receive, send)\n  File \"/usr/local/lib/python3.13/site-packages/starlette/middleware/errors.py\", line 187, in __call__\n    raise exc\n  File \"/usr/local/lib/python3.13/site-packages/starlette/middleware/errors.py\", line 165, in __call__\n    await self.app(scope, receive, _send)\n  File \"/usr/local/lib/python3.13/site-packages/starlette/middleware/exceptions.py\", line 62, in __call__\n    await wrap_app_handling_exceptions(self.app, conn)(scope, receive, send)\n  File \"/usr/local/lib/python3.13/site-packages/starlette/_exception_handler.py\", line 62, in wrapped_app\n    raise exc\n  File \"/usr/local/lib/python3.13/site-packages/starlette/_exception_h

{"success": true, "diff": "--- a//app/main.py\n+++ b//app/main.py\n@@ -264,12 +264,13 @@\n # Database Initialization\n # ============================================================================\n \n-def init_database() -> sqlite3.Connection:\n-    \"\"\"\n-    Initialize SQLite database and create products table.\n-    \n-    This function is called at module load time to ensure the database\n-    is ready before any API endpoints are accessed.\n+def get_db_connection() -> sqlite3.Connection:\n+    \"\"\"\n+    Get a database connection for the current thread.\n+    \n+    SQLite connections are not thread-safe, so we create a new connection\n+    for each request. We use check_same_thread=False to allow the connection\n+    to be used in FastAPI's thread pool.\n     \n     Returns:\n         Database connection object\n@@ -278,7 +279,25 @@\n     DATA_DIR.mkdir(parents=True, exist_ok=True)\n     \n     # Connect to database (creates file if it doesn't exist)\n-    conn = sqlite3.connect(str(DB_FILE))\n+    # check_same_thread=False allows the connection to be used in FastAPI's thread pool\n+    conn = sqlite3.connect(str(DB_FILE), check_same_thread=False)\n+    conn.row_factory = sqlite3.Row\n+    \n+    return conn\n+\n+\n+def init_database() -> None:\n+    \"\"\"\n+    Initialize SQLite database and create products table.\n+    \n+    This function is called at module load time to ensure the database\n+    schema is ready before any API endpoints are accessed.\n+    \"\"\"\n+    # Ensure data directory exists\n+    DATA_DIR.mkdir(parents=True, exist_ok=True)\n+    \n+    # Connect to database (creates file if it doesn't exist)\n+    conn = sqlite3.connect(str(DB_FILE), check_same_thread=False)\n     conn.row_factory = sqlite3.Row\n     \n     # Create products table if not exists\n@@ -290,11 +309,10 @@\n         )\n     \"\"\")\n     conn.commit()\n-    \n-    return conn\n-\n-\n-# Global database connection\n+    conn.close()\n+\n+\n+# Global database connection (not used directly - each request gets its own)\n db_connection: Optional[sqlite3.Connection] = None\n \n \n", "files_modified": ["/app/main.py"], "lint": {"status": "ok", "output": ""}}

I need to fix the thread safety issue with SQLite. Let me update the database connection handling:

→ patch({"path": "/app/main.py", "old_string": "# ============================================================================\n# Database Initialization\n# ============================================================================\n\ndef init_database() -> sqlite3.Connection:\n    \"\"\"\n    Initialize SQLite database and create products table.\n    \n    This function is called at module load time to…)

{"success": true, "diff": "--- a//app/main.py\n+++ b//app/main.py\n@@ -380,13 +380,12 @@\n         print(f\"Warning: Failed to save Bloom Filter to Redis: {e}\")\n \n \n-def load_initial_data(bloom_filter: BloomFilter, conn: sqlite3.Connection) -> None:\n+def load_initial_data(bloom_filter: BloomFilter) -> None:\n     \"\"\"\n     Load initial product IDs from file into Bloom Filter and database.\n     \n     Args:\n         bloom_filter: The Bloom Filter instance to populate\n-        conn: Database connection\n     \"\"\"\n     if not PRODUCTS_FILE.exists():\n         return\n@@ -398,20 +397,28 @@\n                 if product_id:\n                     # Add to Bloom Filter (increments count)\n                     bloom_filter.add(product_id)\n-                    \n-                    # Insert into database (ignore if exists)\n-                    try:\n-                        conn.execute(\n-                            \"INSERT OR IGNORE INTO products (id, name, price) VALUES (?, ?, ?)\",\n-                            (product_id, f\"Product {product_id}\", 99.99)\n-                        )\n-                    except Exception:\n-                        pass\n-        \n-        conn.commit()\n         \n         # Save Bloom Filter state to Redis after loading all data\n         save_bloom_filter_to_redis(bloom_filter)\n+        \n+        # Now populate the database\n+        conn = get_db_connection()\n+        try:\n+            with open(PRODUCTS_FILE, 'r') as f:\n+                for line in f:\n+                    product_id = line.strip()\n+                    if product_id:\n+                        # Insert into database (ignore if exists)\n+                        try:\n+                            conn.execute(\n+                                \"INSERT OR IGNORE INTO products (id, name, price) VALUES (?, ?, ?)\",\n+                                (product_id, f\"Product {product_id}\", 99.99)\n+                            )\n+                        except Exception:\n+                            pass\n+            conn.commit()\n+        finally:\n+            conn.close()\n         \n     except Exception as e:\n         print(f\"Warning: Failed to load initial data: {e}\")\n", "files_modified": ["/app/main.py"], "lint": {"status": "ok", "output": ""}}

Now I need to update all the places that use db_connection to use get_db_connection() instead:

→ patch({"path": "/app/main.py", "old_string": "def load_initial_data(bloom_filter: BloomFilter, conn: sqlite3.Connection) -> None:\n    \"\"\"\n    Load initial product IDs from file into Bloom Filter and database.\n    \n    Args:\n        bloom_filter: The Bloom Filter instance to populate\n        conn: Database connection\n    \"\"\"\n    if not PRODUCTS_FILE.exists():\n        return\n    \n    try:…)

{"success": true, "diff": "--- a//app/main.py\n+++ b//app/main.py\n@@ -448,26 +448,18 @@\n         \n         # Check if initial data file exists\n         if PRODUCTS_FILE.exists():\n-            # Initialize database\n-            db_connection = init_database()\n+            # Load initial data from file (this will save to Redis)\n+            load_initial_data(bloom_filter)\n             \n-            # Load initial data from file\n-            load_initial_data(bloom_filter, db_connection)\n-            \n-            # Close database connection after initial load\n-            db_connection.close()\n-            db_connection = None\n+            # Initialize database schema\n+            init_database()\n     else:\n         # Bloom Filter state exists in Redis - restore it\n         # Database will be initialized on-demand when first accessed\n         \n         # Initialize database schema (but don't pre-populate from file\n         # as the Redis state may be from a different dataset)\n-        db_connection = init_database()\n-        \n-        # Close database connection after schema initialization\n-        db_connection.close()\n-        db_connection = None\n+        init_database()\n \n \n # Initialize system at module load time\n", "files_modified": ["/app/main.py"], "lint": {"status": "ok", "output": ""}}

Now let me update the initialize_system function and the create_product endpoint:

→ patch({"path": "/app/main.py", "old_string": "def initialize_system() -> None:\n    \"\"\"\n    Initialize the entire system at module load time.\n    \n    This follows the exact initialization order specified in requirements:\n    1. Initialize Redis client (already done at module level)\n    2. Check Redis for existing Bloom Filter state\n       - If exists: Load and restore Bloom Filter\n       - If…)

{"success": true, "diff": "--- a//app/main.py\n+++ b//app/main.py\n@@ -678,26 +678,26 @@\n     4. Save updated Bloom Filter state to Redis\n     \"\"\"\n     # Insert into database\n-    global db_connection\n-    if db_connection is None:\n-        db_connection = init_database()\n-    \n+    conn = get_db_connection()\n     try:\n-        db_connection.execute(\n-            \"INSERT INTO products (id, name, price) VALUES (?, ?, ?)\",\n-            (product.id, product.name, product.price)\n+        try:\n+            conn.execute(\n+                \"INSERT INTO products (id, name, price) VALUES (?, ?, ?)\",\n+                (product.id, product.name, product.price)\n+            )\n+            conn.commit()\n+        except sqlite3.IntegrityError:\n+            # Product already exists, retrieve it\n+            pass\n+        \n+        # Retrieve the product\n+        cursor = conn.execute(\n+            \"SELECT id, name, price FROM products WHERE id = ?\",\n+            (product.id,)\n         )\n-        db_connection.commit()\n-    except sqlite3.IntegrityError:\n-        # Product already exists, retrieve it\n-        pass\n-    \n-    # Retrieve the product\n-    cursor = db_connection.execute(\n-        \"SELECT id, name, price FROM products WHERE id = ?\",\n-        (product.id,)\n-    )\n-    row = cursor.fetchone()\n+        row = cursor.fetchone()\n+    finally:\n+        conn.close()\n     \n     product_data = {\n         \"id\": row[\"id\"],\n", "files_modified": ["/app/main.py"], "lint": {"status": "ok", "output": ""}}

Now let me update the create_product endpoint to use get_db_connection():

→ patch({"path": "/app/main.py", "old_string": "@app.post(\"/products\", response_model=ProductResponse)\ndef create_product(product: ProductCreate):\n    \"\"\"\n    Create a new product.\n    \n    Steps:\n    1. Insert into database\n    2. Add to Redis cache\n    3. Add product ID to Bloom Filter\n    4. Save updated Bloom Filter state to Redis\n    \"\"\"\n    # Insert into database\n    global db_co…)

{"success": true, "diff": "--- a//app/main.py\n+++ b//app/main.py\n@@ -613,15 +613,15 @@\n     # Step 3: Query database\n     metrics[\"db_queries_total\"] += 1\n     \n-    global db_connection\n-    if db_connection is None:\n-        db_connection = init_database()\n-    \n-    cursor = db_connection.execute(\n-        \"SELECT id, name, price FROM products WHERE id = ?\",\n-        (product_id,)\n-    )\n-    row = cursor.fetchone()\n+    conn = get_db_connection()\n+    try:\n+        cursor = conn.execute(\n+            \"SELECT id, name, price FROM products WHERE id = ?\",\n+            (product_id,)\n+        )\n+        row = cursor.fetchone()\n+    finally:\n+        conn.close()\n     \n     if row:\n         # Product found - update cache\n", "files_modified": ["/app/main.py"], "lint": {"status": "ok", "output": ""}}

Now let me update the get_product endpoint to use get_db_connection():

→ patch({"path": "/app/main.py", "old_string": "    # Step 3: Query database\n    metrics[\"db_queries_total\"] += 1\n    \n    global db_connection\n    if db_connection is None:\n        db_connection = init_database()\n    \n    cursor = db_connection.execute(\n        \"SELECT id, name, price FROM products WHERE id = ?\",\n        (product_id,)\n    )\n    row = cursor.fetchone()", "new_string": "    …)

{"output": "Warning: Failed to save Bloom Filter to Redis: Error 111 connecting to localhost:6379. Connection refused.\nHealth check: {'status': 'ok', 'bloom_filter_loaded': True}\nBloom stats: {'bit_array_size': 9585058, 'hash_function_count': 6, 'expected_items': 1000000, 'false_positive_rate': 0.01, 'current_items': 20, 'estimated_false_positive_rate': 0.0}\nMetrics: {'db_queries_total': 0, 'bloom_rejects_total': 0, 'cache_hits_total': 0, 'cache_negative_hits_total': 0}\nGet existing product: {'productId': 'A000001', 'exists': True, 'source': 'db', 'data': {'id': 'A000001', 'name': 'Product A000001', 'price': 99.99}}\nGet non-existent product: {'productId': 'NOTEXIST', 'exists': False, 'source': 'bloom', 'data': None}\nWarning: Failed to save Bloom Filter to Redis: Error 111 connecting to localhost:6379. Connection refused.\nCreate product: {'productId': 'NEW001', 'exists': True, 'source': 'db', 'data': {'id': 'NEW001', 'name': 'New Product', 'price': 19.99}}\nGet new product: {'productId': 'NEW001', 'exists': True, 'source': 'db', 'data': {'id': 'NEW001', 'name': 'New Product', 'price': 19.99}}\nUpdated bloom stats: {'bit_array_size': 9585058, 'hash_function_count': 6, 'expected_items': 1000000, 'false_positive_rate': 0.01, 'current_items': 21, 'estimated_false_positive_rate': 0.0}", "exit_code": 0, "error": null}

Now let me run the tests again:

→ terminal({"command": "cd /app && python3 -c \"\nimport main\nfrom fastapi.testclient import TestClient\n\nclient = TestClient(main.app)\n\n# Test health endpoint\nresponse = client.get('/health')\nprint('Health check:', response.json())\n\n# Test bloom stats\nresponse = client.get('/bloom/stats')\nprint('Bloom stats:', response.json())\n\n# Test metrics\nresponse = client.get('/metrics')\nprint('Metrics:',…)

{"output": "=== Initial State ===\nBloom stats: {'bit_array_size': 9585058, 'hash_function_count': 6, 'expected_items': 1000000, 'false_positive_rate': 0.01, 'current_items': 20, 'estimated_false_positive_rate': 0.0}\nMetrics: {'db_queries_total': 0, 'bloom_rejects_total': 0, 'cache_hits_total': 0, 'cache_negative_hits_total': 0}\n\n=== Test 1: Get existing product ===\n{'productId': 'A000001', 'exists': False, 'source': 'db', 'data': None}\n\n=== Test 2: Get non-existent product (bloom filter rejection) ===\n{'productId': 'NOTEXIST', 'exists': False, 'source': 'bloom', 'data': None}\n\n=== Test 3: Create new product ===\n{'productId': 'NEW001', 'exists': True, 'source': 'db', 'data': {'id': 'NEW001', 'name': 'New Product', 'price': 19.99}}\n\n=== Test 4: Get new product ===\n{'productId': 'NEW001', 'exists': True, 'source': 'cache', 'data': {'id': 'NEW001', 'name': 'New Product', 'price': 19.99}}\n\n=== Test 5: Get non-existent product that passed bloom (false positive) ===\n{'productId': 'ALSO_NOT_EXIST', 'exists': False, 'source': 'bloom', 'data': None}\n\n=== Test 6: Get same non-existent product again (should be cached negative) ===\n{'productId': 'ALSO_NOT_EXIST', 'exists': False, 'source': 'bloom', 'data': None}\n\n=== Final Metrics ===\nMetrics: {'db_queries_total': 1, 'bloom_rejects_total': 3, 'cache_hits_total': 1, 'cache_negative_hits_total': 0}\n\n=== Final Bloom Stats ===\nBloom stats: {'bit_array_size': 9585058, 'hash_function_count': 6, 'expected_items': 1000000, 'false_positive_rate': 0.01, 'current_items': 21, 'estimated_false_positive_rate': 0.0}", "exit_code": 0, "error": null}

The basic functionality is working. Now let me test with fakeredis to ensure the full system works:

→ terminal({"command": "cd /app && REDIS_URL=fakeredis:// python3 -c \"\n# Remove the old database and data to start fresh\nimport os\nif os.path.exists('/app/data/products.db'):\n    os.remove('/app/data/products.db')\n\n# Now import and test\nimport main\nfrom fastapi.testclient import TestClient\n\nclient = TestClient(main.app)\n\nprint('=== Initial State ===')\nprint('Bloom stats:', client.get('/bloom/st…)

{"output": "total 28\ndrwxr-xr-x 1 root root  4096 Apr 23 04:48 .\ndrwxr-xr-x 1 root root  4096 Apr 23 04:30 ..\n-rw-r--r-- 1 root root 12288 Apr 23 04:48 products.db\n-rw-r--r-- 1 root root   160 Apr 23 04:29 products.txt", "exit_code": 0, "error": null}

I see an issue - the existing product A000001 is not being found. This is because the database wasn't initialized when the module was first imported. Let me check and fix this:

→ terminal({"command": "cd /app && ls -la /app/data/"})

{"output": "bash: line 3: sqlite3: command not found", "exit_code": 127, "error": null}

{"output": "{'id': 'NEW001', 'name': 'New Product', 'price': 19.99}", "exit_code": 0, "error": null}

{"output": "Warning: Failed to save Bloom Filter to Redis: Error 111 connecting to localhost:6379. Connection refused.\nWarning: Failed to save Bloom Filter to Redis: Error 111 connecting to localhost:6379. Connection refused.\n=== Initial State ===\nBloom stats: {'bit_array_size': 9585058, 'hash_function_count': 6, 'expected_items': 1000000, 'false_positive_rate': 0.01, 'current_items': 20, 'estimated_false_positive_rate': 0.0}\nMetrics: {'db_queries_total': 0, 'bloom_rejects_total': 0, 'cache_hits_total': 0, 'cache_negative_hits_total': 0}\n\n=== Test: Get existing product ===\n{'productId': 'A000001', 'exists': True, 'source': 'db', 'data': {'id': 'A000001', 'name': 'Product A000001', 'price': 99.99}}", "exit_code": 0, "error": null}

I see - the initial data from products.txt wasn't loaded. This is because when we import the module with `REDIS_URL=fakeredis://`, it's a fresh import but the database file already exists from a previous run. Let me trace through the initialization logic more carefully and fix it:

→ terminal({"command": "cd /app && python3 -c \"\nimport os\nimport sys\n\n# Remove all state to start fresh\nif os.path.exists('/app/data/products.db'):\n    os.remove('/app/data/products.db')\nif os.path.exists('/app/data/products.txt'):\n    # Recreate products.txt\n    with open('/app/data/products.txt', 'w') as f:\n        for i in range(1, 21):\n            f.write(f'A{i:06d}\\n')\n\n# Now import with …)

{"output": "=== Initial State (with fakeredis) ===\nBloom stats: {'bit_array_size': 9585058, 'hash_function_count': 6, 'expected_items': 1000000, 'false_positive_rate': 0.01, 'current_items': 20, 'estimated_false_positive_rate': 0.0}\nMetrics: {'db_queries_total': 0, 'bloom_rejects_total': 0, 'cache_hits_total': 0, 'cache_negative_hits_total': 0}\n\n=== Test 1: Get existing product ===\n{'productId': 'A000001', 'exists': False, 'source': 'db', 'data': None}\n\n=== Test 2: Get non-existent product (bloom filter rejection) ===\n{'productId': 'NOTEXIST', 'exists': False, 'source': 'bloom', 'data': None}\n\n=== Test 3: Create new product ===\n{'productId': 'NEW001', 'exists': True, 'source': 'db', 'data': {'id': 'NEW001', 'name': 'New Product', 'price': 19.99}}\n\n=== Test 4: Get new product (should be cached) ===\n{'productId': 'NEW001', 'exists': True, 'source': 'cache', 'data': {'id': 'NEW001', 'name': 'New Product', 'price': 19.99}}\n\n=== Test 5: Get non-existent product (should be bloom reject) ===\n{'productId': 'ALSO_NOT_EXIST', 'exists': False, 'source': 'bloom', 'data': None}\n\n=== Final Metrics ===\nMetrics: {'db_queries_total': 1, 'bloom_rejects_total': 2, 'cache_hits_total': 1, 'cache_negative_hits_total': 0}\n\n=== Final Bloom Stats ===\nBloom stats: {'bit_array_size': 9585058, 'hash_function_count': 6, 'expected_items': 1000000, 'false_positive_rate': 0.01, 'current_items': 21, 'estimated_false_positive_rate': 0.0}\n\n=== Redis Keys ===\nbloom:filter: gASVDwAAAAAAAAB9lCiMCWJpdF9hcnJheZRCNUgSAAAAAAAAAA...\ncache:product:A000001: __NOT_FOUND__...\ncache:product:NEW001: {\"id\": \"NEW001\", \"name\": \"New Product\", \"price\": 1...", "exit_code": 0, "error": null}

Now it's working. The issue was that the database was being loaded from a previous run. Now let me test with fakeredis to verify the full flow including persistence:

→ terminal({"command": "cd /app && python3 -c \"\nimport os\nimport sys\n\n# Remove all state to start fresh\nif os.path.exists('/app/data/products.db'):\n    os.remove('/app/data/products.db')\nif os.path.exists('/app/data/products.txt'):\n    # Recreate products.txt\n    with open('/app/data/products.txt', 'w') as f:\n        for i in range(1, 21):\n            f.write(f'A{i:06d}\\n')\n\n# Now import with …)

{"output": "Bloom filter count: 20\nProducts in DB: None", "exit_code": 0, "error": null}

I see the issue - when the module is reloaded with a different REDIS_URL, it's not properly reinitializing. The database shows A000001 is not found. Let me trace through the logic more carefully:

→ terminal({"command": "cd /app && python3 -c \"\nimport os\n\n# Ensure clean state\nos.environ['REDIS_URL'] = 'fakeredis://'\n\n# Remove all state\nif os.path.exists('/app/data/products.db'):\n    os.remove('/app/data/products.db')\nif os.path.exists('/app/data/products.txt'):\n    with open('/app/data/products.txt', 'w') as f:\n        for i in range(1, 21):\n            f.write(f'A{i:06d}\\n')\n\n# Fresh …)