Add reproduction for Sentry SDK clickhouse-driver generator issue

Co-authored-by: daniel.szoke <[email protected]>

Author: cursoragent

reproduction/README.md

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+# ClickHouse-Driver Generator Issue Reproduction
+
+This directory contains a minimal reproduction for the Sentry SDK issue #4657:
+https://github.com/getsentry/sentry-python/issues/4657
+
+## Issue Summary
+
+When using a generator as a data source for INSERT queries with clickhouse-driver,
+the Sentry SDK's clickhouse-driver integration consumes the generator before it 
+reaches clickhouse-driver, resulting in no data being inserted.
+
+The bug occurs when `send_default_pii=True` is set, causing the integration to
+call `db_params.extend(data)` which exhausts the generator.
+
+## Setup
+
+1. Create a virtual environment:
+   ```bash
+   python -m venv venv
+   source venv/bin/activate  # On Windows: venv\Scripts\activate
+   ```
+
+2. Install dependencies:
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+## Running the Reproduction
+
+### Option 1: Simple Reproduction (Recommended)
+This shows the core issue clearly:
+
+```bash
+python simple_reproduce.py
+```
+
+Expected output:
+- TEST 1 (Generator): Shows the generator being consumed by Sentry, leaving 0 items for clickhouse-driver
+- TEST 2 (List): Shows that lists work correctly since they can be consumed multiple times
+
+### Option 2: Comprehensive Test
+This includes multiple test scenarios:
+
+```bash
+python reproduce_issue.py
+```
+
+This script will:
+1. Test without Sentry SDK (works correctly)
+2. Test with Sentry SDK (fails - demonstrates the bug)
+3. Show the exact traceback scenario from the issue
+
+## Key Code Location
+
+The bug is in `/workspace/sentry_sdk/integrations/clickhouse_driver.py` at lines 141-143:
+
+```python
+if should_send_default_pii():
+    db_params = span._data.get("db.params", [])
+    db_params.extend(data)  # <-- This consumes the generator!
+    span.set_data("db.params", db_params)
+```
+
+## Workarounds
+
+Until this is fixed, you can:
+
+1. **Disable PII**: Set `send_default_pii=False` in `sentry_sdk.init()`
+2. **Use lists instead of generators**: Convert generators to lists before passing to `execute()`
+3. **Disable the integration**: Remove `ClickhouseDriverIntegration()` from your Sentry config
+
+## Expected Fix
+
+The integration should check if `data` is a generator and handle it appropriately,
+possibly by:
+- Not consuming generators when storing params
+- Converting to a reusable iterator (like `itertools.tee`)
+- Only storing a sample of the data rather than all of it

reproduction/reproduce_issue.py

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+#!/usr/bin/env python3
+"""
+Minimal reproduction for Sentry SDK clickhouse-driver generator issue.
+Issue: https://github.com/getsentry/sentry-python/issues/4657
+
+The problem: When using a generator as a data source for INSERT queries,
+the Sentry clickhouse-driver integration consumes the generator before
+it's passed to clickhouse-driver, resulting in no data being inserted.
+"""
+
+import logging
+from typing import Generator, Dict, Any
+
+# Set up logging to see what's happening
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+logger = logging.getLogger(__name__)
+
+try:
+    import sentry_sdk
+    from sentry_sdk.integrations.clickhouse_driver import ClickhouseDriverIntegration
+    logger.info(f"Sentry SDK version: {sentry_sdk.__version__}")
+except ImportError:
+    logger.error("Failed to import sentry_sdk - make sure it's installed")
+    raise
+
+try:
+    from clickhouse_driver import Client
+    import clickhouse_driver
+    logger.info(f"clickhouse-driver version: {clickhouse_driver.VERSION}")
+except ImportError:
+    logger.error("Failed to import clickhouse_driver - run: pip install clickhouse-driver")
+    raise
+
+
+# Mock clickhouse client to demonstrate the issue without requiring actual ClickHouse instance
+class MockClient:
+    """Mock ClickHouse client that logs when data is sent"""
+    
+    def __init__(self):
+        self.received_data = []
+    
+    def execute(self, query: str, data=None):
+        logger.info(f"Execute called with query: {query}")
+        if data is not None:
+            # This simulates clickhouse-driver consuming the generator
+            consumed_data = list(data)
+            logger.info(f"Data received by clickhouse-driver: {consumed_data}")
+            self.received_data = consumed_data
+        return None
+
+
+def create_data_generator() -> Generator[Dict[str, Any], None, None]:
+    """Create a generator that yields test data"""
+    logger.info("Creating data generator")
+    records = [
+        {"id": 1, "name": "Test 1"},
+        {"id": 2, "name": "Test 2"},
+        {"id": 3, "name": "Test 3"}
+    ]
+    for record in records:
+        logger.info(f"Generator yielding: {record}")
+        yield record
+
+
+def test_without_sentry():
+    """Test inserting data without Sentry SDK initialized"""
+    logger.info("\n=== Testing WITHOUT Sentry SDK ===")
+    
+    client = MockClient()
+    
+    # Create generator
+    data_gen = create_data_generator()
+    
+    # Execute insert with generator
+    client.execute("INSERT INTO test_table (id, name) VALUES", data_gen)
+    
+    logger.info(f"Data received by MockClient: {client.received_data}")
+    assert len(client.received_data) == 3, f"Expected 3 records, got {len(client.received_data)}"
+    logger.info("✓ Test WITHOUT Sentry: PASSED")
+
+
+def test_with_sentry():
+    """Test inserting data with Sentry SDK initialized"""
+    logger.info("\n=== Testing WITH Sentry SDK ===")
+    
+    # Initialize Sentry with clickhouse-driver integration
+    sentry_sdk.init(
+        dsn="https://[email protected]/1",  # Dummy DSN
+        integrations=[ClickhouseDriverIntegration()],
+        send_default_pii=True,  # This triggers the bug!
+        traces_sample_rate=1.0,
+    )
+    
+    # Monkey-patch to use our mock client
+    original_client = Client
+    
+    class PatchedClient(MockClient):
+        def __init__(self, *args, **kwargs):
+            super().__init__()
+            # Need to add attributes that Sentry integration expects
+            self.connection = type('Connection', (), {
+                'host': 'localhost',
+                'port': 9000,
+                'database': 'default'
+            })()
+            
+        def send_data(self, *args):
+            """This method gets wrapped by Sentry"""
+            logger.info(f"send_data called with args: {args}")
+            if len(args) >= 3:
+                data = args[2]
+                # Try to consume the data
+                try:
+                    consumed = list(data)
+                    logger.info(f"send_data consumed data: {consumed}")
+                except Exception as e:
+                    logger.error(f"Error consuming data in send_data: {e}")
+    
+    # Replace the import
+    clickhouse_driver.client.Client = PatchedClient
+    
+    try:
+        # Create client (will be our patched version)
+        client = Client()
+        
+        # Create generator
+        data_gen = create_data_generator()
+        
+        # The integration will wrap send_data and consume the generator here
+        # Before the actual clickhouse-driver gets to use it
+        client.execute("INSERT INTO test_table (id, name) VALUES", data_gen)
+        
+        logger.info(f"Data received by MockClient: {client.received_data}")
+        
+        # This will fail because the generator was consumed by Sentry integration
+        assert len(client.received_data) == 3, f"Expected 3 records, got {len(client.received_data)}"
+        logger.info("✓ Test WITH Sentry: PASSED")
+        
+    except AssertionError:
+        logger.error("✗ Test WITH Sentry: FAILED - No data received (generator was consumed)")
+        raise
+    finally:
+        # Restore original
+        clickhouse_driver.client.Client = original_client
+
+
+def demonstrate_traceback_generator():
+    """Demonstrate the exact traceback from the issue"""
+    logger.info("\n=== Demonstrating Traceback with Exception Generator ===")
+    
+    # Initialize Sentry
+    sentry_sdk.init(
+        dsn="https://[email protected]/1",
+        integrations=[ClickhouseDriverIntegration()],
+        send_default_pii=True,
+        traces_sample_rate=1.0,
+    )
+    
+    def exception_generator():
+        """Generator that throws when consumed"""
+        raise ValueError("sh*t, someone ate my data")
+        yield  # Never reached
+    
+    class TracebackClient(MockClient):
+        def __init__(self, *args, **kwargs):
+            super().__init__()
+            self.connection = type('Connection', (), {
+                'host': 'localhost',
+                'port': 9000,
+                'database': 'default',
+                '_sentry_span': None
+            })()
+            
+        def send_data(self, sample_block, data, *args):
+            """This simulates the actual clickhouse-driver send_data signature"""
+            logger.info("Original send_data called")
+            # This is where clickhouse-driver would normally consume the data
+            # But Sentry's wrapper already consumed it!
+            try:
+                list(data)
+            except Exception as e:
+                logger.info(f"Expected: data already consumed by Sentry wrapper")
+    
+    original_client = Client
+    clickhouse_driver.client.Client = TracebackClient
+    
+    try:
+        client = Client()
+        
+        # This will throw in Sentry's wrapper
+        try:
+            client.send_data(None, exception_generator())
+        except ValueError as e:
+            logger.error(f"Exception raised in Sentry wrapper: {e}")
+            logger.info("This proves the generator is consumed by Sentry before clickhouse-driver uses it")
+            
+    finally:
+        clickhouse_driver.client.Client = original_client
+
+
+if __name__ == "__main__":
+    logger.info("Starting clickhouse-driver generator issue reproduction...\n")
+    
+    # Test 1: Without Sentry (should work)
+    try:
+        test_without_sentry()
+    except Exception as e:
+        logger.error(f"Test without Sentry failed: {e}")
+    
+    # Test 2: With Sentry (will fail due to bug)
+    try:
+        test_with_sentry()
+    except AssertionError:
+        logger.info("Expected failure - this demonstrates the bug")
+    
+    # Test 3: Show exact traceback scenario
+    try:
+        demonstrate_traceback_generator()
+    except Exception as e:
+        logger.error(f"Traceback demonstration error: {e}")
+    
+    logger.info("\n✓ Reproduction complete!")
+    logger.info("The issue is confirmed: Sentry's clickhouse-driver integration")
+    logger.info("consumes generators before they reach clickhouse-driver.")

reproduction/requirements.txt

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+# Install local sentry-python SDK in editable mode
+-e /workspace
+
+# Install clickhouse-driver
+clickhouse-driver==0.2.9