python.async_resource_cleanup

Stability High

Detects async resources not properly cleaned up.

Why It Matters

Leaked async resources:

• Connection leaks — Clients/sockets not closed
• Resource exhaustion — File descriptors run out
• Memory leaks — Objects never garbage collected

Example

# ❌ Before (resource not cleaned up)
async def fetch_data():
    client = httpx.AsyncClient()
    response = await client.get(url)
    return response.json()
    # Client never closed!

# ✅ After (proper cleanup with async context manager)
async def fetch_data():
    async with httpx.AsyncClient() as client:
        response = await client.get(url)
        return response.json()
    # Client automatically closed

What Unfault Detects

• AsyncClient without async context manager
• aiofiles.open without async with
• Database connections not closed

Related Rules

• python.uncancelled_tasks