# Custom Memory Storage

CrewAI supports custom memory storage implementations for different memory types. You can provide your own storage implementation by extending the `Storage` interface and passing it to the memory instances or through the `memory_config` parameter.

## Implementing a Custom Storage

To create a custom storage implementation, you need to extend the `Storage` interface and implement the required methods:

```python
from typing import Any, Dict, List
from crewai.memory.storage.interface import Storage

class CustomStorage(Storage):
    """Custom storage implementation."""

    def __init__(self):
        # Initialize your storage backend
        self.data = []

    def save(self, value: Any, metadata: Dict[str, Any]) -> None:
        """Save a value with metadata to the storage."""
        # Implement your save logic
        self.data.append({"value": value, "metadata": metadata})

    def search(
        self, query: str, limit: int = 3, score_threshold: float = 0.35
    ) -> List[Any]:
        """Search for values in the storage."""
        # Implement your search logic
        return [{"context": item["value"], "metadata": item["metadata"]} for item in self.data]

    def reset(self) -> None:
        """Reset the storage."""
        # Implement your reset logic
        self.data = []
```

## Using Custom Storage

There are two ways to provide custom storage implementations to CrewAI:

### 1. Pass Custom Storage to Memory Instances

You can create memory instances with custom storage and pass them to the Crew:

```python
from crewai import Crew, Agent
from crewai.memory.short_term.short_term_memory import ShortTermMemory
from crewai.memory.long_term.long_term_memory import LongTermMemory
from crewai.memory.entity.entity_memory import EntityMemory
from crewai.memory.user.user_memory import UserMemory

# Create custom storage instances
short_term_storage = CustomStorage()
long_term_storage = CustomStorage()
entity_storage = CustomStorage()
user_storage = CustomStorage()

# Create memory instances with custom storage
short_term_memory = ShortTermMemory(storage=short_term_storage)
long_term_memory = LongTermMemory(storage=long_term_storage)
entity_memory = EntityMemory(storage=entity_storage)
user_memory = UserMemory(storage=user_storage)

# Create a crew with custom memory instances
crew = Crew(
    agents=[Agent(role="researcher", goal="research", backstory="I am a researcher")],
    memory=True,
    short_term_memory=short_term_memory,
    long_term_memory=long_term_memory,
    entity_memory=entity_memory,
    memory_config={"user_memory": user_memory},
)
```

### 2. Pass Custom Storage through Memory Config

You can also provide custom storage implementations through the `memory_config` parameter:

```python
from crewai import Crew, Agent

# Create a crew with custom storage in memory_config
crew = Crew(
    agents=[Agent(role="researcher", goal="research", backstory="I am a researcher")],
    memory=True,
    memory_config={
        "storage": {
            "short_term": CustomStorage(),
            "long_term": CustomStorage(),
            "entity": CustomStorage(),
            "user": CustomStorage(),
        }
    },
)
```

## Example: Redis Storage

Here's an example of a custom storage implementation using Redis:

```python
import json
import redis
from typing import Any, Dict, List
from crewai.memory.storage.interface import Storage

class RedisStorage(Storage):
    """Redis-based storage implementation."""

    def __init__(self, redis_url="redis://localhost:6379/0", prefix="crewai"):
        self.redis = redis.from_url(redis_url)
        self.prefix = prefix

    def save(self, value: Any, metadata: Dict[str, Any]) -> None:
        """Save a value with metadata to Redis."""
        key = f"{self.prefix}:{len(self.redis.keys(f'{self.prefix}:*'))}"
        data = {"value": value, "metadata": metadata}
        self.redis.set(key, json.dumps(data))

    def search(
        self, query: str, limit: int = 3, score_threshold: float = 0.35
    ) -> List[Any]:
        """Search for values in Redis."""
        # This is a simple implementation that returns all values
        # In a real implementation, you would use Redis search capabilities
        results = []
        for key in self.redis.keys(f"{self.prefix}:*"):
            data = json.loads(self.redis.get(key))
            results.append({"context": data["value"], "metadata": data["metadata"]})
            if len(results) >= limit:
                break
        return results

    def reset(self) -> None:
        """Reset the Redis storage."""
        for key in self.redis.keys(f"{self.prefix}:*"):
            self.redis.delete(key)
```

## Benefits of Custom Storage

Using custom storage implementations allows you to:

1. Store memory data in external databases or services
2. Implement custom search algorithms
3. Share memory between different crews or applications
4. Persist memory across application restarts
5. Implement custom memory retention policies

By extending the `Storage` interface, you can integrate CrewAI with any storage backend that suits your needs.